Does anyone know a good website with a electrical-to-Boiler Schematic of a 3.6kW Element powered by solar?
This is imperative. Please leave site which has the 12VDC Battery, Solar Panel powering it and the Element or Water Heater.
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That didn’t answer the Question though!
Some wind turbines connect to a water heater, but that’s called a dump load, to prevent the turbine from turning too fast. If the water is heated, that’s incidental.
Running an electrical heater by solar is horribly wasteful. When water is to be heated, typically it is heated directly by the solar. This takes a fraction of the area (maybe 1/5 the size), and is much cheaper (maybe 1/6 the price).
Schematic of How to Build a Solar Panel For Free Energy