I found some interesting videos about pv direct and sand batteries the other day. Similar to hot water storage, but with greater capacity and no leaks. One company in Finland was resistance heating sand with a closed forced air loop that would bring temperatures up to about 600 degrees. They could store this heat energy for days or weeks.
I'm wondering if this process could be adapted for a residential home for heating. I've already read about some folks in cold climates installing heat tape in the sand under their house to keep it warm with low off peak rates. Why couldn't you install PV panels to heat a similar system with no controller inverter or batteries involved?
Thanks
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