I'd think you'd need at least 100Ah to be happy without charging the moped. For doing that you'll need quite a bit more.
For reference we've done a lot of winter boondocking with 210Ah of lead acid and 120W of solar and the batts would last 2-3 days even if it was sunny. I've since installed a 390w panel so I'm expecting it to be able to keep up. We run very little stuff, with the stereo and diesel heater being the main draws. In summer we hardly touch the battery capacity, even with the GF using her laptop all day.
If you're trying to run an old propane furnace you'll need either a gigantic battery or a generator. Those things use a lot of power. A new Chinese diesel heater will work better and use way less electricity and fuel. The fridge will need a tiny bit of 12v for the light and control when it's running on propane.
I can't imagine a lithium battery would be worth the insane cost unless that's not a factor or the weight savings is a deal breaker. For the cost of one 100Ah lithium battery I bet you could get an AGM battery, 250W solar panel, and charge controller. Of course you have less usable discharge capacity with lead acid batteries vs lithium, but you can overcome that with MOAR batteries.
ride bikes, climb, ski, travel, cook, work to fund former, repeat.
Bookmarks