Using low-grade sand, the device is charged up with heat made from cheap electricity from solar or wind.
The sand stores the heat at around 500C,
The sand stores the heat at around 500C,
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Anyone else notice the sand battery fails to address this problem?BBC said:The toughest question is about intermittency - how do you keep the lights on when the sun doesn't shine and the wind doesn't blow?
TugBoat said:It seems like they should chose a more ideal medium than "rocks". The thermal conductivity of rocks isn't very good which will limit power output