I'm in process of scaling up my Motorhome power solution. Right now, it is 1200 watts solar to four 6V agm batteries in series/parallel 12V configuration.
My Idea is to rewire the battery to series 24V and charge from MPPT from solar. I would like to purchase a 24V Phoenix inverter, but at the same time keep the 12V House DC and Alternator 12V charging.
I'm about maxed out at 12V on solar and see the benefits of going to 24V, as I have room to add 600 more watts. My controller will handle 1800 Watts at 24V output with no issue.
Is it practical to tap off two 6V batteries to run the coach 12V DC portion (not much current is used, lights and water pump, etc) and keep the alternator charging @12V but use solar to series charge the bank @ 24V from the MPPT controller and pull 24V to the inverter? I know several suggest DC24V-DC12V converters and I have looked at Equalizers too. My concern is the alternator charging just half the bank and what implications that, if any, will have to the whole system. Perhaps some isolators of some kind would be needed here? The reason for all this mess is I'm sizing all this for the future when I upgrade to expensive lithium. I want it all to be at 24V for the inverter portion but don't want to trash the new AGM batteries at this point.
Actually, when charging with the alternator @12V to half the bank, Solar will also be charging @24V to the whole bank via the MPPT... If that is even possible without causing Cherrnobyl.
Educated thoughts on this are welcome. I have exhausted all my searches and asked The Google for optons.