Image: Nexol
From pv magazine Germany
The system can be integrated into almost all existing storage units with an E-sleeve and can also be retrofitted into many existing systems.
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I have wondered about this even in the US. I would *think* even a modest array would be useful to supplement the water heaters primary power source, as long as it was switched off once it reached temp. No batteries needed, just dump the electricity as heat into the water heater.
Knowing the German whole-home boiler/radiator setups, that’s a LOT more requirement for electricity than the more common (in the US) ~200L tank that is not used for heat.