House batteries to use with large inverter

Remember my glass of water
Microwave temperature versus time
Comparisons. You can do the same with different batteries, MSW vs PSW
And the thermometer is right before your very eyes.
BS Proof

+1 for using four batteries minimum to properly drive a 2000 watt inverter.
For extended use... six+ batteries.

2oldman wrote:
You will need 4 batteries of at least 400ah total to comfortably fire up a microwave. And if your inverter is MSW, it will have to run twice as long as if you had a PSW.

No you can use the MW if the two batts are above 75% (see my post above) Good point about the inverter. If it is MSW it will draw way fewer amps to run the MW than a PSW inverter would to run the same MW, so it is easier on the batteries.

The extra time is less important for the AH usage. I don't find it takes twice as long.

Say your potato takes 8 minutes with PSW at 150a but 10 minutes at 100a (what I see in real life comparison)

150 x 8/60 = 20 AH, while 100 x 10/60 = 16.7 AH

So actually, as long as the MSW inverter and the MW get along (never mind the groaning turn table as long as it runs at all ) you do better with the MSW for MW work. Of course the MSW inverter has to be one of the heavy duty types rated to run motors etc.

You will need 4 batteries of at least 400ah total to comfortably fire up a microwave. And if your inverter is MSW, it will have to run twice as long as if you had a PSW.

You can run the MW on a pair of 6s just fine, but there is a higher voltage sag under load than with 12s. This means that you need to be above about 75% SOC to keep loaded voltage above the 11v inverter alarm. To stay above 11v at 50% SOC you need four 6s. With solar it is easier to stay in the high SOCs, but with gen/charger and doing 50-90s it is more likely you will be below 75% when you want to run the MW.

However, guys here with AGMs (which are 12v) report small voltage drops under heavy load so they can be much lower in SOC and still run the MW with only two batts (sometimes with just one AGM) This makes them ideal for small RVs which can only carry two batts but still want to run the MW.