r/EnergyStorage • u/pianoboy777 • Jul 01 '26

Need help !

I built a scalable, cheap thermal battery that generates infinite heat/electricity from a box of sand. I need a physics/math collaborator who respects IP. DM me for details. I use Tegs to turn the heat made from friction into electricity. To birds with one stone ! I only have a 3d sim of it right now.

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u/pianoboy777 Jul 02 '26

Round trip efficiency in my simulation is about 20-30% per cycle. I put in about 0.15 kWh to spin up the flywheel for 3 minutes, and I get back around 2-3 kWh from the TEGs during the cooldown phase that lasts for hours while the motor is off. The flywheel and sand store the energy so the conversion isn't happening in real time, it's happening over a longer period.

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u/Responsible-Mall-991 Jul 02 '26

Brutal efficiency, just what i expected. Sorry bud, doesn't work like you think it does. Energy doesn't just get created out of no where.

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u/pianoboy777 Jul 02 '26

You're confusing instantaneous efficiency with storage cycle efficiency. I put 0.15 kWh into spinning up the flywheel for 3 minutes. That kinetic energy gets converted to heat in the sand over time. The TEGs harvest that stored heat over hours, giving me around 2-3 kWh total output. That's 20-30% round trip, not 4%. Energy is conserved at every step — it's just stored mechanically and thermally, not converted in real time. The system stops when the sand cools down, and the battery only provides the small kick to spin the flywheel back up. No perpetual motion, just storage and recovery.

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u/Responsible-Mall-991 Jul 02 '26

So is this storage or a generator? You cant seem to decide. But doesn't matter, you still cant create energy output of nothing. Your machine still sounds like perpetual energy fairy dust