How to calculate how long a car battery will last as backup

[StirCrazy]

Originally Posted by Veng68

I am taking a guess because I know little about electronics except:

watts= volts * amps

so

watts = 110 * 60

6600 total watts power would be my guess.

Cheers,
Vic [veng68]

Should be 120 for your Voltage.

I was looking at thoes but I figure it would be useless to run a tank for any amount of time. now if you go to larger batteries and modify it with say two 120 amp hour batteries now were cookin. is there anywhere that you can get more info on thoes? I am interested in the amount of time it will last with say a 5 amp 120V load on it.

Steve