ib516 wrote:
I tried a single group 24 last year and used the inverter to run a small (700w) 5 cup coffee maker -- major fail. Basically fried that poor flooded G24 battery. So it's gone, I bought a coffee percolator for the stove top...
You've apparently learned that propane is
much more efficient than batteries for heat.
You're worrying about the converter/charger for the wrong reasons. A better one isn't going to give you that much more short term weekend camping time before you run out, it's going to add long term life to the battery.
Worry about reducing/conserving electrical consumption. Change out the incandescent bulbs for LEDs, turn off stuff you don't need when not in use, etc. Figure out what's really draining battery power, and fix it. What do you do that uses electricity?
We can easily go 2 days on a single Group 24 marine battery if we have to. Even longer if we plan in advance (and use flashlights, etc.). But more recently we've added solar (and a couple of GC2s are next) to the point of not having to worry as long as we're not in the deep woods with no sun. Everything will be covered other than air conditioning, and that's the hardest thing to run when boondocking.