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Originally Posted by gadget
VFDs are getting cheaper. Still out of my price range though. What type of thermal storage are you working on?
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A Prius inverter is about $100 or just above and will get you two 3 phase inverters to work with. Just replace the control board with some STM32s to turn it into a VFD.
https://openinverter.org/wiki/Toyota_Prius_Gen3_Board
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I'm not sure how long the compressor would last in the first stage since it would be running constant for days and days.
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Why would you run it at night (discharging the batteries) when you can use thermal storage instead, which is orders of magnitude cheaper?
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