Small AC motors and Inverters

BFL13 wrote:

...
To stay above 11v loaded, it is best to have fat wires and a big battery bank. With just two batteries, you have little margin to run the loads when the batteries are near 50% before you start the inverter. Having fat wires with just two batteries gives you more margin.

You are right. With the 60A, 10ft cable scenario, Ampacity is not relevant (10ga would be good enough), but for max 3% voltage drop I need 6ga cable. And a max 1% drop specification would require a 3ga cable at 10ft, according to the Circuit Wizard.

But 3% of 12V is only 0.36V, not huge but that has to be subtracted from the battery voltage. What sort of voltage can I expect at the battery if it's at 50% SOC (12.0-12.1V) and 20A (for the coffee grinder) is withdrawn from a 220Ah battery?

I suppose "it depends" on battery condition and other factors too numerous mention. Guess I'll find out, probably not until November in Smoky Mtn NP though; that's usually when I start wishing for a bigger battery bank.

The inverter's low battery alarm is at 11V, and shutoff occurs at 10.5V.

BFL13 wrote:

...
It was shown on here a while back that AGMs can take a big load and stay above 11v much better than Wets can. If you have a small rig that cannot carry more than two batteries, and you want to run big inverter loads, having AGMs would be the way to go.
...

Thanks. Another plus for AGMs. I could carry more than two back in the living area at the foot of the bed.