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If you have the space a hybrid water heater would help a lot. Electric water heaters with resistive elements are usually the biggest power draw.
I have a small closet that is outside where my water system components are at that makes hybrid a bad idea.
I'm eventually going for a hybrid heat pump model but I mentioned a cheap electric resistive one as a preheater because it's easy to use as a dump load
Not sure how this benefits much. A 2nd electric heater is a decent amount of wiring to deal with, extra breaker space on your panel, conduit, etc.
A bigger heater would have the same effect without the extra costs of install, plus the added benefit of less surface area to lose heat.
If you’re going through the effort of installing a 2nd water heater just buy a heat pump one.
Another method would be to set your temp higher during lower rates, and lower during higher rates. You’ll save a tad bit of electricity if you make use of that hotter water before it reaches the lower temp. I don’t think it’s enough savings to make a difference though.
What i do is run my hot water tank when rates are favorable (evenings and weekends). I live alone so I'm easily able to micromanage when hot water is needed.
I'm not on solar yet, i want to but I'd need a long time to make it worthwhile vs my current bills and I have bigger priorities to throw money at for now.
Maybe in a solar scenario you could not power the hot water tank at all unless being charged by solar, letting it use more energy throughout the evening and able to take more energy during the day while solar is producing vs having it be topped up by the grid after use in the evenings.