Originally Posted by Old Navy
Depends on the capacity of the batteries. My experience ranges from 1 -3 hours, depending how dead I've killed them. If you have a control center, it will show you charge rate - when it gets down to 4 amps you're probably good to go.
I agree. My four golf cart batteries with 440 amp hours of capacity would be useable shortly after the generator started. It will probably never fully recharge the batteries, but will get them to 90%.
Never having done the above from a dead battery status, I would think at least 3 hours or more to get to 90%.