September 23, 20178 yr This product can detect if excess PV |Energy is being fed back into grid and use it to heat water ( upto 3 KW) https://www.aliexpress.com/item/3000W-Excess-plus-Solar-I-boost-Alternative-Energy-saving-for-water-boiler-infrared-heating-system/32613200769.html PV panel users applying net metering or grid ties should benefit from it I just found it while browsing for Solar Hot water products Edited September 25, 20178 yr by ghatikar link corrected
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