Hey I was probably looking at that same one on ebay last night. Well a 24v verson.
I looked at some 48v ones and they were expensive.
A lot of the smaller ones were designed to be hooked straight to a panel. I would have to have on demand and therefor powered by battery.
800+ watts is way too much the small charge controller I would be using.
So what I would do to keep from killing the batteries is use the DC output on the charge controller to power a contactor when water is needed.then when battery voltage drops below 11 volts the contactor won't close. Batteries only get slightly over drawn, not killed totally dead.
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