December 13, 2024
We have begun planning for an exciting, large-scale project with a new, significant client. This sand battery will be substantially larger and more powerful than the prototype we have developed, tested, and optimized so far.
This project marks a major step forward in our vision of making the sand battery a key component in future energy solutions.
In the image, you see Pontus and Paul — both with extensive experience in energy technology and system design — collaborating to sketch out a large-scale sand battery with optimized heat transfer. The goal is to create a solution that is not only efficient and sustainable but also tailored to meet the client's specific energy needs.
This project represents an exciting challenge and an opportunity to showcase the potential of sand batteries on a larger scale.
Photo: Susanne Kindblad
December 9, 2024
We are proud to be featured in the latest issue of Skärgården magazine! The article highlights our journey with the sand battery and how we are working to create a sustainable and innovative solution for energy storage.
The feature discusses the sand battery's potential to revolutionize the energy market, our vision for a climate-smart future, and the technical advancements we’ve achieved along the way. The magazine also provides insight into the challenges and opportunities our development team encounters as we work to optimize the sand battery.
We are grateful to Skärgården magazine for helping to spread awareness about our work and the sand battery’s role in advancing the transition to a more sustainable energy system.
You can read the article here (Swedish only) or on Skärgården’s website (for subscribers).
Foto: Peter Augustsson
December 2, 2024
We continue to heat the sand battery despite the biting winter cold and relatively high electricity prices. We do this because we have more to learn about heat distribution in the sand layer and about air pressure and thermodynamics at higher temperatures.
To ensure that our sand battery operates optimally even during the colder winter months, we have now insulated the fan and heater with several layers of insulation. This allows the system to continue running despite low temperatures and high electricity prices.
The additional insulation helps keep the system warm and energy-efficient, while reducing energy losses and improving performance under winter conditions. We continue to monitor the results and further develop the sand battery’s ability to function under all weather conditions.
Foto: Susanne Kindblad
November 25, 2024
The new fan in the sand battery is now fully operational. Following its installation, we have commenced data collection to thoroughly analyze and optimize airflow and heat transfer within the system.
Designed to handle high temperatures and enhance performance, the fan is critical for ensuring consistent heat distribution and efficient energy storage. Using our sensors, we are monitoring its functionality in real time, gathering valuable insights that will contribute to further development and refinement of the sand battery's capabilities.
Photo: Susanne Kindblad
November 18 2024
After undergoing modifications at the engineering company Sprintline in Tranås, the new fan has finally arrived and been installed in the sand battery. The fan plays a crucial role in the system, ensuring smooth air circulation and efficient heat transfer within the battery.
This upgraded fan is the result of meticulous design and customization to optimize the performance of our high-temperature system. With this key milestone achieved, we are excited to advance the sand battery to the next level and continue developing even more sustainable and efficient energy solutions.
A big thank you to Sprintline for their skilled work and seamless collaboration on this project!
Photo: Susanne Kindblad
November 15, 2024
Yesterday, the team behind the sand battery attended the Final Pitch Event for Startup4Climate – Sweden's largest innovation competition for sustainable energy solutions.
Unfortunately, we were not among the finalists this year, but we now have a clear goal: to stand as finalists next year and pitch our groundbreaking sand-based energy storage technology to some of the country’s leading green energy investors.
The event was a fantastic opportunity to connect with other innovators and energy experts while sharing our vision of a future with stable and renewable energy solutions.
A big thank you to the organizers and all participants for an inspiring evening! And our warmest congratulations to the winners, Nordic Bio-Graphite and Rebaba!
Photo: Susanne Kindblad
November 8, 2024
This week, Susanne and Maria from the sand battery development team attended an inspiring women’s networking event for the industrial sector in Södertälje.
The gathering brought together women from various areas of industry to share experiences, build connections, and discuss future challenges and opportunities in the field.
For the sand battery team, participating in the event provided valuable connections and insights into how to attract more women to technology and industry roles. Susanne and Maria are excited to bring fresh inspiration back to their work as they continue advancing sustainable energy solutions in an inclusive and equal team.
Promoting gender equality and creating an open work environment are central to our mission, and we’re proud to be part of the movement for more women in industry.
Maria and Susanne were also accompanied by the team’s newest member — Elvin, 2 months old.
Photo: Susanne Kindblad
October 28, 2024
As part of our ongoing efforts to enhance the performance of the sand battery, we have now integrated AI-based technology to optimize energy management. By analyzing data from sensors that monitor temperature, humidity, and energy consumption, the sand battery can adjust its operations in real-time to maximize efficiency and safety.
This new AI technology enables faster decisions on when to store or distribute energy based on weather conditions and energy prices. With this solution, we can predict changes in energy demand and act proactively, which is crucial for balancing energy flow and maximizing the use of renewable energy.
We’re excited to take another step toward a more sustainable and efficient energy future, continuing to lead innovation in energy storage technology.
Photo: Solen Feyissa on Unsplash
October 19, 2024
"Design for Assembly" (DfA) is a design philosophy focused on making a product as simple and cost-effective as possible to assemble. The goal is to minimize time, cost, and the risk of errors during the assembly process, without compromising the product's functionality or quality.
In our work on the sand battery project, we have started applying DfA principles. By simplifying the assembly of various components in the system, including fans, sensors, and heating elements, we can streamline production and improve maintenance. Fewer parts and more standardized solutions make it easier to both build and service the sand battery, while also increasing operational reliability.
Photo: Susanne Kindblad
October 10, 2024
Today, Pontus and Susanne had a highly productive visit to the workshop company Sprintline in Tranås.
We received valuable assistance from ventilation experts Martin and Jesse, who helped us with key modifications to the new fan system for the sand battery. Their expertise has been instrumental in improving the system's performance and ensuring it operates optimally going forward.
We look forward to deepening our collaboration with Sprintline and hope to engage them for further improvements related to the sand battery’s mechanics.
Photo: Susanne Kindblad
October 3, 2024
We have now acquired a new, more robust fan to replace the existing fan system in the sand battery. The previous fan system experienced significant wear due to prolonged use under very high temperatures, which led to the need for an upgrade.
The new fan system has better capacity to handle a greater airflow and higher pressure. It is also better equipped to manage the heat, ensuring more reliable operation of the sand battery moving forward.
Photo: Susanne Kindblad
September 29, 2024
We now have an accumulator tank installed, and the next step is to connect the piping between it and the sand battery prototype. The accumulator tank will play a crucial role in the energy storage process.
Its purpose is to store and distribute thermal energy, allowing us to extract heat from the sand battery at the most optimal times. This installation marks a significant step forward in our efforts to optimize the sand battery's capacity and efficiency.
Photo: Susanne Kindblad
September 16, 2024
The command center for the sand battery is starting to feel cramped. With all the new equipment installed, including more sensors, more powerful computers, and the upgraded fan system, the space has quickly filled up. In the picture, we see Pontus, Christoffer, and Paul installing an electricity meter on each phase to better monitor the energy consumption of the sand battery's heater.
We are currently working on integrating the sand battery's surveillance cameras with an audio recording system to remotely monitor the status of the fan system. Plans for an improved monitoring system in the command center are being discussed to meet future needs and further optimize the operation of the sand battery.
Photo: Susanne Kindblad
September 9, 2024
Christoffer has moved his office outdoors to be closer to the command center and the sand battery's electronic system.
Today, he replaced the sand battery's small Arduino computer with a more powerful Arduino to enable the connection of additional sensors for measuring temperature and humidity in various parts of the sand battery.
We have now collected a significant amount of data and gained valuable insights into how heat spreads within the sand battery.
Photo: Susanne Kindblad
September 2, 2024
We are developing an app for monitoring and controlling the sand battery. Once the app is completed, users will be able to track temperature and energy consumption in real time. Our goal is to integrate this service into Tibber’s range of Smart Home services. Learn more about Tibber’s existing Smart Battery services here.
We are currently working on optimizing the charging process of the sand battery. This means the sand battery will heat up when solar panels generate surplus energy and/or when electricity prices are low. By optimizing the charging process, we aim to offer an energy storage solution that is both cost-effective and helps balance the load on the public power grid.
August 27, 2024
To enhance the safety of the sand battery, we have implemented several important measures. Electrical safety has been improved by installing switches on each heating element and circuit, allowing for remote shutdown if needed. We have also reinforced the insulation around the heater and pipes, as well as installed sensors to monitor temperature and humidity levels.
One of the biggest security risks is a break-in at the command center. To prevent this, we have installed cameras both inside and outside the facility to monitor and protect the site around the clock. These measures are designed to ensure the safe and secure operation of the sand battery.
Photo: Susanne Kindblad
Augusti 20, 2024
We are currently developing an app designed to facilitate the monitoring and control of the system. The app will allow users to track temperatures, humidity levels, and energy storage in real time, as well as regulate and remotely shut down heating elements and circuits.
Through this app, we aim to enhance the efficiency and safety of the sand battery's operation while also improving user-friendliness.
Photo: Olenka Zhuk on Unsplash
August 17, 2024
The heating and fan system of the sand battery has been running for a while now, and it’s getting extremely hot inside the command center. We have reinforced the insulation around the heater and pipes, and we are currently collecting data from various sensors placed inside and around the sand layer. Our goal is to determine how quickly the sand layer heats up and to what extent the heat spreads beyond the sand container.
We are dealing with very high temperatures in the command center, and there is some concern that the heat might spread outside the metal building, posing a risk of igniting the surrounding area. Therefore, we have removed all tall grass and laid a layer of sand around the command center to reduce the risk of a fire breaking out.
Photo: Susanne Kindblad
August 12, 2024
Someone has bitten through the insulation that protects the pipes running to and from the sand battery during the night. We wonder if it could have been a fox, badger, or wild boar. All of these animals are present in the area, but we’re not aware if any of them typically show interest in insulation.
Photo: Susanne Kindblad
Augusti 8, 2024
All pipes are now connected and insulated, the heating system is connected, and the fan system is running, circulating the air in the sand layer.
The air sent into the sand battery is very hot, while the air that returns after a circuit in the sand layer is cool. This means that the thermal energy in the air when it is introduced into the sand battery is stored in the sand battery.
We are now working on collecting measurement data on temperature and humidity from various locations within the sand battery to monitor the distribution of heat within the sand battery.
Photo: Pontus Kindblad
August 2, 2024
We have now installed surveillance cameras both inside and outside the command center for the sand battery. This is an important step towards enhancing security and protecting the facility. With these new cameras, we can monitor operations around the clock and prevent potential security incidents.
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Foto: Susanne Kindblad
July 28, 2024
The control unit and heating system of the sand battery have been in the workshop for some time for an update of the heater's control system.
Now, all electronics as well as the control and regulation technology for the sand battery have been moved to the command center that is connected to the sand battery. The remaining task is to connect the final pipes to the system and then start heating the sand battery.
Photo: Maria Olsson
July 22, 2024
Maria is currently working on insulating the cables for the sand battery's heating unit. This is being done to improve fire safety and strengthen the durability of the sand battery. By protecting the cables with better insulation, we reduce the risk of overheating and ensure a safer and more reliable operation of the system.
Photo: Pontus Kindblad
July 20, 2024
In our efforts to improve the performance of the sand battery, we have begun implementing AI-based technology for energy management optimization. By using advanced algorithms, we can analyze large amounts of data from sensors and adjust operations in real time to maximize efficiency.
This AI integration enables us to anticipate and respond to changes in energy demand, further enhancing the stability and capacity of the sand battery. With these advancements, we are taking a step closer to an even more sustainable and intelligent energy storage solution.
Photo: Susanne Kindblad
July 12, 2024
To improve the efficiency and safety of the sand battery project, we have begun the reconstruction and reinforcement of the fan system. The new fan system will optimize air circulation within the sand layer, which in turn enhances heat transfer and ensures a more even temperature distribution.
This work aims to increase the system's performance and reliability, which is crucial for maximizing energy storage and stability in the sand battery.
Photo: Susanne Kindblad
July 7, 2024
In order to be able to save money with a sand battery, you need to use electricity when it is cheapest, regardless of whether you produce your own electricity with the help of solar panels or if you buy all your electricity via the public electricity grid.
For this reason, we have recently started using hourly price data from an electricity supplier to check when the sand battery should be heated. This means that we can buy electricity when it is cheap, and extract heat when it is expensive.
July 1, 2024
We have chosen to name the shed the command center to increase the serious tone of the project.
Soon the heating and fan systems as well as the control and regulation system will move into the command center and after that we will start the heating of the sand battery again.
Photo: Susanne Kindblad
June 20, 2024
We are currently exploring the possibility of increasing the efficiency of the sand battery by using high temperature heat pump technology.
We compare prices and performance in high-temperature heat pumps from different suppliers in order to purchase the most suitable pumps. Our goal is to increase the efficiency of the sand battery by 15%. Keep following our work to see if we succeed!
June 10, 2024
Ceramic insulation materials are exceptional in their ability to withstand extremely high temperatures, over 2000 degrees Celsius.
The purpose of using these materials is to minimize heat loss and thereby increase energy efficiency.
Additionally, ceramic insulation materials protect the fan motor and surrounding components such as mounts, extending their lifespan and improving operational reliability in high-temperature environments.
Photo: Susanne Kindblad
June 4, 2024
This software needs to ensure that the sand battery is efficiently operated and enable the owner to monitor and control its operation.
One of the first aspects we have had to solve is how to control the temperature in the sand battery radiator array when we have determined that it’s a good time to start heating the sand. We generally want to put heat down in the sand as quickly as possibly, which means we want the air to be as hot as possible. However, if the air becomes too hot we may damage or destroy components.
May 30, 2024
We have been informed that our application for funding from the Swedish Energy Agency has been granted. This means that we will work with experiments using high temperature heat pump technology in the sand battery prototype.
It also means that we will be able to work more intensively with the further development of the sand battery during the project period 1 June - 30 September 2024
Many thanks to the Swedish Energy Agency!
April 27, 2024
Our team has successfully completed the metalwork preparations for the installation of the upgraded heating system for the sand battery.
The metalwork, which involved precision welding and steel processing, is a crucial step in ensuring the durability and efficiency of our energy storage system. With this step completed, we are one step closer to implementing a groundbreaking solution for heating indoor air and hot water in houses, townhouses, and public buildings.
Photo: Susanne Kindblad
April 12, 2024
Today, Pontus and Susanne had the great honor of participating as speakers at a conference on the topic of energy storage, organised by the Energy Evolution Center in Eskilstuna.
Our contribution to the conference was very well-received, and the questions from conference participants seemed endless. We hope that photos from our presentation will eventually appear on this link.
Photo: Susanne Kindblad
April 8, 2024
Preparations are underway here for a welding job where a piece of cast iron will be processed to manufacture a tool.
Here, Christoffer, Maria, and Marcus are involved in preparations for welding in cast iron to manufacture a new tool. The tool will be used to shape a sheet metal detail to be used in the improved heating system 2.0 of the sand battery.
Photo: Susanne Kindblad
April 2, 2024
The fan system used to rotate the air in the sand battery undergoes an inspection aimed at reducing the vibrations that occur.
We have also upgraded to a more efficient fan motor.
Photo: Susanne Kindblad
March 23, 2024
To enhance safety around the sand battery's heating unit, we’ve ordered new warning signs for the storage shed where it will be located.
Today, the signs arrived, ready for installation, marking an important step in keeping our workspaces safe and clearly marked for all team members.
Photo: Susanne Kindblad
March 8, 2024
The testing and exploration of the possibilities of the sand battery heating unit continues. The purpose is to increase the heating rate in order to increase the performance of the sand battery.
Here, Pontus and Christoffer are preparing the heating unit for connecting a high-temperature heat pump.
Photo: Pontus Kindblad
March 7, 2024
During the winter, the sand battery has been disconnected, waiting for sunshine and reasonable electricity prices. We have worked on other projects and interspersed this with further developing the optimisation of the heating system and constructing a fireproof shed where the heating system and fan system will be stored.
Now we can't wait to plug in and test the improved heating system!
Photo: Susanne Kindblad
November 21, 2023
We switch off the heating and let the sand battery go into hibernation. Since we do not yet have any self-produced electricity from solar panels connected to the sand battery and since it is hardly financially justifiable to buy electricity at this time of the year, we have chosen to disconnect the sand battery over the winter.
In the spring, our plan is to start installing solar panels so that we can recharge the sand battery during the summer. During the winter of 2024, the heat from the sand battery will heat indoor air and hot water in the house if everything goes as we have planned.
See you again in the spring of 2024!
Photo: Susanne Kindblad
October 31, 2023
The construction of a prototype for a sand battery project has been in progress since June 1st. Currently, our focus is on preparing a comprehensive report and submitting an application to the Swedish Energy Agency for ongoing project financing.
We aspire to secure the opportunity to further advance the project by constructing a full-scale microgrid installation. This installation will incorporate solar panels alongside a connected sand battery, complemented by traditional batteries for short-term electricity storage.
As we await feedback, we are actively continuing temperature measurements. This ongoing effort allows us to draw conclusions regarding the efficiency and storage capacity of the sand battery
October 23, 2023
We have completed a market analysis for the business around sand batteries. The analysis shows good opportunities for business development around the innovation and we are now looking for one or more investors who want to help us with financial muscles to be able to market the sand battery as quickly as possible.
Are you an investor or do you know someone who you think might be interested in investing in our company? Contact us and we'll talk some more!
October 21, 2023
The heating system and fan system have been switched on and the heating of the sand battery is in full swing. We measure and document how quickly it is possible to heat up 24m³ of sand. Our goal is for the sand battery to reach a temperature of 600 - 650 °C.
Did you know that around 2/3 of a villa's energy consumption is used for heating and hot water? This electricity is normally consumed when the load on the public electricity grid is greatest, which means peak loads for electricity producers and higher electricity costs for consumers. Through the sand battery, electricity can be stored in the form of heat for a long time. The heat can then be used for heating houses and hot water, and in this way the public electricity grid is relieved while the cost for electricity consumers drops.
Photo: Susanne Kindblad
October 20, 2023
Now the entire three meter deep pit is filled up. In the spring, we will plant grass seeds in the entire area where the sand battery is located and where the excavated masses have been.
We have a vision of building a greenhouse on top of the sand battery to take advantage of any waste heat that will seep up through the ground. Unfortunately, it does not fit within the framework of this project, but in the spring we hope that we will have time and money to build a greenhouse. Come and visit us and see how things are going!
Photo: Susanne Kindblad
October 18, 2023
We have got the insulation layer on the top of the sand battery in place and now the closure is underway so that the sand battery is kept watertight.
We use a heat-insulating foil called Alu-Pap to keep the heat inside the sand battery while keeping the moisture on the outside. The foil consists of a three-layer laminate consisting of paper, LDPE polyethylene and aluminium. The foil provides a re-reflection of heat while keeping moisture away from the sand battery. To get tight joints, we use aluminum tape generously.
Photo: Susanne Kindblad
October 16, 2023
The pipe system where the hot air will circulate is in place in the sand battery. A couple of tons of sand had to be removed from the pit and then put back. Our backs are tired but the satisfaction is great that the pipe system and the sand are in place.
The next step will be to insulate the top of the sand battery, first with ceramic fiber cloth, then with approximately 20 bags of perlite and finally everything must be sealed with a layer of the aluminum foil Alu-Pap to keep the moisture away. A layer of construction boards is placed on top to prevent gravel and stones from damaging the waterproof layer. Finally, we will cover the sand battery with gravel and soil.
Photo: Susanne Kindblad
October 13, 2023
Sensors for measuring temperature and humidity have been placed in various spots in and around the sand battery. To know if the prototype works as well as our calculations show, we need to measure how fast the heating goes, how long the heat can be maintained, and the degree of penetration of moisture.
We measure not only inside the sand battery, but also in and just outside the various insulation layers. In this way, we can determine how much waste heat the sand battery emits.
If it turns out that the sand battery releases a lot of waste heat, we will come up with a solution for how this heat should be used in the best way. For example, a greenhouse can be placed on top of the sand battery and the waste heat can thus be used for winter cultivation.
Photo: Susanne Kindblad
October 10, 2023
We are currently working on the specification for the web application that will be built to overview the heat in the sand battery and to control the extraction of heat.
The work includes developing a list of requirements of the highest priority functions in the app and to ensure that we get the functions that are most in demand, we have put together a small focus group consisting of as many men as women.
The list of requirements will be the basis for the production of the app at a later stage.
October 9, 2023
We put the finishing touches on the heating box, which after a lot of tests and improvements is now ready for connection to the sand battery.
The heating technology is based on inductance, but we choose not to reveal exactly how the heating technology is constructed. It may become the subject of a patent application in the future and then it is important that we have not revealed too much about the technology underlying the heating of the sand battery.
Now we are anxiously waiting to see if everything works as expected when we connect the heating box and fan system with the sand battery.
Photo: Susanne Kindblad
October 6, 2023
The pipe system where the hot air will circulate is in place in the sand battery. The pipe system needs to be buried a bit and we will work on that during the weekend.
Come by if you are keen to help! We have plenty of shovels and we treat everyone who helps us to coffee! 😜
Photo: Susanne Kindblad
October 3, 2023
In Salsån in Jämtland, Katerina and Kenneth Nordin are building a huge silo to be filled with 60 tons of granite macadam. The idea seems to be the same as our sand battery, except that Kenneth and Katerina have chosen to build their battery above ground, just like the Finnish company Polar Night Energy.
See the news clip from SVT Jämtland at: https://www.svt.se/nyheter/lokalt/jamtland/unikt-energilager-utvecklas-i-salsan-se-hur-det-fungerar--rz4snt
Oktober 2, 2023
The construction of the heating system and the fan system for the rotation of the hot air is going on in parallel with the work in the pit.
The work places high demands on heat resistance as the air to be rotated in the system will maintain a temperature of up to 800°C.
We have received some help to get started with welding work and construction of an extra heat-resistant fan.
Photo: Pontus Kindblad
September 29, 2023
We are still working on the backfilling of soil and other excavated materials in the space outside the outer container of the sand battery.
Are you keen to help? We have plenty of shovels but unfortunately the budget for excavator hire ran out a long time ago...
Come and help us dig for a couple of hours and we'll treat you to coffee!
Photo: Susanne Kindblad
September 27, 2023
With some assistance of an extra large crane truck, we finally got the sand in place in the sand battery. Out of a total of sixteen cubic meters of sand, twelve are now in place and we are now working on connecting the pipe system that will rotate air for heating the sand battery.
Sand weighs quite a lot so it was very helpful that we were able to get the second delivery via a crane truck that could place the sandbags directly into the pit. We continue to work with the refilling of slag masses in the space outside the sand battery itself.
If you want a free, meaningful and guaranteed sweaty workout, you're welcome to help us move chess pieces back more into the pit around the sand battery! We have plenty of shovels, so just show up at Sigfridsdalsvägen 11 in Hässelby!
Photo: Susanne Kindblad
September 20, 2023
The inner container in the sand battery is insulated with a ceramic insulating fabric that can withstand temperatures up to 1260°C.
We chose an environmentally approved insulation fabric where the fibers are biodegradable and therefore less harmful to health and our climate.
We consistently have high standards in our material choices in the sand battery. Our goal is not only to create a product that saves energy in the form of heat, but the end product should also contribute to a positive climate transition. We work for this by choosing the materials that are most gentle on the climate and by only benefiting producers who produce sustainable raw materials.
Photo: Susanne Kindblad
September 15, 2023
With the help of the excavator, both containers for the sand battery have now been lifted into place.
The outer, larger container has been insulated with a heat-resistant and waterproof material. We then filled it with the insulation material Perlite. Once that was done, the smaller container was lifted into place.
The heat development was not to be trifled with when the sun was shining and Perlite is a material that dusts tremendously when the bags are opened and the contents are distributed in the container. The next step is to fill an inner container with sand and with the pipe system that has been designed to circulate hot air in the sand battery.
Photo: Marcus Nordgren
September 11, 2023
Perlite is volcanic rock that expands greatly when heated. Therefore, it has one of the market's best insulation values, a low climate footprint and it can withstand exposure to very high temperatures.
We have chosen to insulate the sand battery with perlite because it has good climate properties, a low climate footprint and because it is a material that can withstand very high temperatures without the risk of ignition.
The outer container is filled with approximately 50 cm of perlite before the inner sand container is lifted into place. Next, the sides will be filled with perlite so that the inner container is surrounded by perlite.
Photo: Dan Widegren
September 5, 2023
The outer container of the sand battery is covered with a heat insulating foil called Alu-Pap to retain the heat inside the sand battery while keeping the moisture on the outside of the sand battery.
The foil consists of a three-layer laminate consisting of paper, LDPE polyethylene and aluminium. The foil provides a re-reflection of heat while keeping moisture away from the sand battery. To get tight joints, we use aluminum tape generously.
Photo: Susanne Kindblad
August 30, 2023
We participate in the Startup 4 Climate competition organized by, among others, Ellevio and GodEl. Startup 4 Climate is one of Europe's biggest innovation challenges aimed at young companies with ideas that can accelerate the energy transition.
We want to encourage everyone to visit their website and vote! Regardless of whether you vote for the sand battery or for one of the other contributions, you are doing a good deed. For each vote, Ellevio and GodEl donate five kronor to Doctors Without Borders.
August 28, 2023
With support from our hired excavator, after a lot of effort and trouble, we got the outer sand container in place in the pit. We had underestimated the labor involved in moving the containers and we were forced to unscrew the outer container and then reassemble it once it was in place in the pit.
Although we had hired a large excavator, the excavator arm was not enough to lift the outer, larger container down.
Now that the container is in place, it is reassembled and insulated with a water and heat insulating film.
Photo: Dan Widegren
August 24, 2023
Natural batteries of sand, salt, heat, air and other elements are intended to make it possible to take advantage of the energy from wind turbines and solar panels when the sun does not shine and the wind does not blow, writes the Washington Post.
The price of renewables is significantly lower than the cost of fossil fuels, especially after a Russian fuel backlash has pushed prices across Europe to record highs. But the green energy revolution still faces a major obstacle: the lack of long-term, cost-effective renewable storage.
The Washington Post highlights the Finnish company Polar Night Energy, which has developed a sand battery in the form of a silo above ground.
Read the entire article for free at https://www.washingtonpost.com/climate-solutions/2023/08/24/natural-battery-storage/
August 17, 2023
The sand and the insulating material will be placed in large containers to keep them apart and to avoid moisture in the sand battery. The containers will be placed in the pit and filled with sand and insulating material respectively.
We happened to choose really windy days for the construction of the containers. This means that the strength testing is ongoing and that we put a lot of hard work into protecting the containers from blowing apart before they are in place in the pit.
Photo: Susanne Kindblad
August 10, 2023
Testing of the measurement sensors is ongoing to ensure that the data we collect is registered and stored correctly. Based on this data, we will be able to draw conclusions about the heating rate in the sand battery. We will also be able to measure the storage capacity and make adjustments to the processes for inputting and extracting heat in the sand battery.
In the clip, you see Marcus and Pontus measure and record the temperature of ice cream.
Photo: Pontus Kindblad
August 8, 2023
The heat in the sand battery must, to the greatest extent possible, stay inside the sand until it is time to extract the heat for heating indoor air and hot water. To make this possible, the battery needs to be properly insulated.
We have chosen the material Perlite as insulation material. Perlite is a volcanic material which after intense heating becomes white and porous, almost like crumbled styrofoam. Perlite can not only be used as an insulating material but also as a natural soil improver.
Perlite has been chosen as insulation material because it is gentle on the environment and very heat resistant.
Photo: Susanne Kindblad
August 2, 2023
To measure how the heat is distributed in the sand battery, a number of sensors are placed in different places inside the construction. The sensors need to withstand extremely high temperatures so that we can collect measurement data throughout the project.
We will also place sensors that measure the moisture in the sand battery. Will we succeed in building a completely waterproof outer container?
Photo: Dan Widegren
July 28, 2023
In the heat exchange system, the hot air must circulate to heat the sand. The installation of the pipes itself has taken some time, but now the construction is starting to take shape. In the pilot project, we will measure how much energy is required to reach approximately 600 ºC, the time required to reach this goal and we will also measure how long we can store the heat in the sand battery.
Photo: Susanne Kindblad
July 23, 2023
A mountain in Linköping will act as a rechargeable battery to save heat for the winter. The technical works are now carrying out an attempt to make use of waste heat.
In a mountain, under a sheepfold, in Vallastaden in Linköping, heat must be saved for the winter. A short distance away is the waste incineration plant where garbage is burned and district heating is produced there. But during the summer, not all heat is used.
The excess heat heats up the groundwater that circulates in the rock. In this way, the mountain is charged with heat that can hopefully be stored for the winter. The mountain becomes like a thermal battery.
https://www.svt.se/nyheter/lokalt/ost/de-lagrar-varme-i-berggrunden-ska-anvandas-i-vinter
July 22, 2023
In the last week, no less than three people unknown to us have contacted us and shown interest in the project.
We are of course very happy when people get in touch, regardless of whether it concerns possible future collaborations, a desire to get involved in the project or just curiosity. We welcome all kinds of thoughts and ideas that can improve the construction of the sand battery.
Do you want to get involved in the project or do you want to know more? Contact us and we'll talk more!
Photo: Susanne Kindblad
July 18, 2023
We build the parts of the heat exchange system that are placed in the sand battery itself from exhaust pipes. The hot air must circulate in the pipes to heat up the sand and to later extract heat from the sand battery.
Photo: Dan Widegren
July 12, 2023
Thanks to our friend and colleague Martin Kemani, we have received a drone film showing the pit where the sand battery will be located.
July 7, 2023
We try to use recycled materials as far as possible. When we build the scaffolding that will hold the sand battery's insulating layer, we use, for example, old planks that have seen their best days long ago.
The purpose of the sand battery is to combat global warming by storing heat in an environmentally friendly way. We are therefore careful to choose materials that have as little negative impact on the climate as possible. Therefore, it is a good idea to recycle old wood.
Photo: Melker Kindblad
July 4, 2023
In the sand battery prototype, we will collect lots of measurement data to ensure that the heat storage works as intended. We will also measure the temperature in the insulation layers as well as in the soil around the sand battery to determine how much waste heat is produced. Based on the data we collect, we will optimize the isolation of the sand battery.
Work is now underway to design the measuring equipment. Pontus programs microcontrollers and does tests with various sensors for humidity and heat.
Photo: Susanne Kindblad
June 16, 2023
We buy in insulation material and construction material for the sand battery. Marcus and Susanne have been driving trucks and carrying construction boards and gravel in the heat today.
A lot of time has been spent evaluating different building and insulation materials. We now believe that we have fully planned the details of the construction of the sand battery itself and most of the material is in place. Now many sweaty hours remain so the construction itself will be carried out.
Photo: Susanne Kindblad
June 12, 2023
Today we excavate the pit where the sand battery will be placed. Our extremely pleasant and competent excavator operator Thomas completed the work in one morning and now we are starting work on constructing the sand battery.
Photo: Susanne Kindblad
June 8, 2023
We have carried out a patentability investigation in collaboration with a patent lawyer. The purpose of the investigation was to ensure that with our sand battery we do not infringe on any existing patent and to clarify whether there is anything in the technology we are developing that can or should be protected through a separate patent application.
Our patent attorney has clarified that we have so-called Freedom to Operate, which means that there are no currently valid patents that we could risk infringing.
He also advised us to reveal as little as possible to our potential competitors. However, we have chosen not to follow this advice, but instead to share our lessons learned and experience with you on this website.
Are you planning to build your own sand battery? Or do you have skills that could be of help to us? Get in touch and we'll talk more!
June 1, 2023
The project is officially underway! We take in different quotes, compare materials and prices and order equipment. We study thermodynamics and different insulation materials while we discuss patent strategies with a patent consultant.
Soon we will start the actual construction of the prototype for the sand battery. Follow the work here at sandbatteri.se and contact us if you want to know more about the project!
Photo: Susanne Kindblad
May 5, 2023
The Swedish Energy Agency (Energymyndigheten) has decided to grant support in the form of a grant to K-mit AB for the implementation of the project "Microgrid with sand battery" during the period 1 June 2023 - 31 October 2023.
The project revolves around constructing a prototype of a microgrid for 2 to 10 houses where solar panels and/or wind power generate electricity that is stored in two ways:
Together, these storage methods mean that the houses are to a very large extent powered by self-produced energy. The heat in the sand battery can be saved for months to be used for heating the house and hot water.
Sand is a cheap raw material and the components used for heating and extracting heat are also cheap and gentle on the environment. As a result, our product has a positive climate impact while at the same time lowering heating costs for consumers. The strength of this innovation is that it is durable, cost-effective and that it can be installed in already existing houses.
The Sand Battery is developed by K-mit AB
