Re: 12v charge level dependant switch for 120v outlet.
Not so fast guys, I do not have time to post the detailed response but this is the very approach boywonder is looking at. Some mods like a 12v heating element and tank size need to be considered. The idea is to "dump" the excess solar not needed for the batteries, once they are charged, into the heating element for water. At least the solar PV is being used to bring the water temp above ambient to some degree.
Heating the water directly by the sun energy striking a black tank is more efficient than converting to electric, but it can still be done to some degree of not "wasting" sun energy.
Pretty sure others will jump in on this one.
Beastie 3: 2002 7.3 EB Cargo: Agile TTB, CCV Mid Top, Custom Walk Through, Lots of stuff added. BlingMyRig.com