PV Thermal Battery: Difference between revisions
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*Water is less expensive than batteries. In fact, about 100,000x less expensive per kg. [https://chatgpt.com/share/6896609b-e200-8010-b0fe-d347ba815a36] - 1/20 cent vs 2500 cents | *Water is less expensive than batteries. In fact, about 100,000x less expensive per kg. [https://chatgpt.com/share/6896609b-e200-8010-b0fe-d347ba815a36] - 1/20 cent vs 2500 cents | ||
*What if we just store water? Yes! | *What if we just store water? Yes! | ||
*You can use a heat pump. | *You can use a heat pump to heat water. [[Hot Water Heat Pump]] costs $6k for 60k BTU. | ||
=Try 2= | =Try 2= | ||
Revision as of 20:50, 8 August 2025
Concept
- Photovoltaics and other renewables are not gaining traction like they should be because of intermittency - what do you do with PV if there is no sun at night?
- Batteries are expensive. To store enough energy, say in winter when there is little sun - for 5 days - would require a tremendous amount of storage. About $50k [1]
- But here's how we do it - store the heat in thermal mass - water - not battery storage.
- Water is less expensive than batteries. In fact, about 100,000x less expensive per kg. [2] - 1/20 cent vs 2500 cents
- What if we just store water? Yes!
- You can use a heat pump to heat water. Hot Water Heat Pump costs $6k for 60k BTU.
Try 2
Detailing the scenario, 20 sq meters of IBC totes 2 high, raised only 30C from 20-50C - or in the negative direction in summer - stores heat/cool for 12 days, and takes 6 days to produce that heat with PV! 1 MWhr of heat stored.
https://chatgpt.com/c/685b1c5e-83c8-8010-a0e4-bbd8923c8845
Initial
See in https://chatgpt.com/share/6858a32a-d328-8010-8c0b-3268127ba2f1
Result 1:
Result 2:
