Low voltage means big current which means big wires and heating.
Every time you step up or step down in voltage you take an efficiency hit and leaving those power supplies to idle is going to create a drain too.
When I first started looking at RVs, I started looking at solar, then I started looking at DIY Tesla style power walls. A 14s lithium ion 48v system makes a lot of sense.
If you have a big roof, more solar makes a lot of sense.
The bigger you go, the less you need a generator. Go big enough and you might be able to use excess solar to heat your water (when your house battery is fully charged excess power is wasted otherwise).
My dream setup would be 2-3 kw of solar with just a small propane tank as a backup for heating and refrigeration. Not cheap but I might never have to run a generator and boondocking might only be constrained by my black tank.
Any way, if you want to run a microwave off of 12v, you need a good inverter and it's probably going to draw 60-70 amps from your battery. A 48v setup pulls 15 amps or about 250ma per cell (if it's 14s 60p) which is nothing for a Lithium cell.
If you want to charge your house battery from your altrenator, look at solar charge controllers. They can boost or buck your power and limit the charging current so your altrenator won't die.
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