The reason nobody is commenting is probably they don't understand your needs - I don't. The people here are very knowledgeable, but they generally won't spend time on something that is not defined, won't be done to code, etc etc. If I understand it, you are looking at replacing one 4500W element with a 600W element, and disconnecting the other. If you do that, how will you get the water heated, and what will power it? You said in another thread that you can use 90+kwh per day, but here your house sounds like it isn't completed yet.
How are you going to run your house for a month with the grid down, with a grid-tied solar system?
How are you going to run your house for a month with the grid down, with a grid-tied solar system?
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