[Ozarkguy]

You need to determine total 12vdc load first. Look at the charts in the inverter manual to calculate loads (approx) on the a/c loads. Calculate available battery amp hrs You should be able to calculate how much stuff you can run and for how long. You are using more juice than you think. Lights, pumps etc. another interesting point is that the engine driven alternator dos not TOP off the batteries to the point the inverter charger does therefore you may not have started out with a full load. Newell is sorta a electric hog. So you'll probally find its doing ok at 5-6 hrs. Try topping off with Genny & charger n see if it does better.