# Battery life using 6000 watt inverter

• ggpa
In summary, using four 125 ah deep cycle batteries connected in parallel, with a 6000 watt inverter and a 12 amp 120 volt AC load, you should be able to operate for approximately 90 minutes before the batteries reach 50% capacity, assuming the inverter has an efficiency of 80%. It is important to regularly recharge the batteries and use batteries of the same type and age to avoid premature aging.

#### ggpa

I have four 125 ah batteries powering a 6000 watt inverter. The inverter is supposed to have a no load draw of 2 amps. I have a 12 amp 120volt Ac load. How long should I be able to operate before drawing my batteries to 50%

By the way, the batteries are 12 volt deep cycle. They are connected in parallel

Using very rough numbers, about 2 kwh from those 4 batteries.

A better way to express it is to recharge whenever the loaded voltage drops below 12V, of 12.2V when rested and at no load.

ggpa said:
I have four 125 ah batteries powering a 6000 watt inverter. The inverter is supposed to have a no load draw of 2 amps. I have a 12 amp 120volt Ac load. How long should I be able to operate before drawing my batteries to 50%

The output of the inverter is..
12A * 120V = 1440W
If the inverter was 100% efficient then the input would also be 1440W but that's unlikely. Efficiencies of >80% are possible. Using 80% that gives an input power of

1440/0.8 = 1800W
At 12V that's a current of

1800/12 = 150A or 37.5A per battery.

You say they have a nominal capacity of 125AH but only want to use 50% so they can deliver that 37.5A for
125/(2*37.5) = 1.6 hours. Call it 90 mins.

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