800watts?!?
What do you plan on powering?
And what size is the battery bank?
Maybe take one 100 w panel into a scc then into a med-size agm just for for the heater element? And that would be it's own system always active.
I placed my house batteries on the d. side to balance the weight, they are 98lbs each... and the length of 0 Guage wire was less than 6 ft. to the ACR & house batteries. (I wanted the batteries to have a chance at a long life so they are inside to minimize the temperature swings)
And my water...
I have a 7.3 van with dual starting batteries and mounted the 2 house batteries inside with 200wt solar on the roof and a Blue sea 7622 to tie the banks together. It's been flawless over two years.
My Engel MT45 has been running for over two years, zero issues on my 12v solar system. I have it set to 36deg... Mostly located in hot, sweaty and humid FL but I do travel to all sorts of climates around the country.
(Unplugged for cleaning)
I wouldn't hesitate to run your's as you want.
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