How to choose battery for desktop computer typical

How to choose battery for desktop computer typical

That battery is possibly capable of 85 amp-hours as this is the usual way of describing battery capacity. So, suppose the inverter needs 150 watts to operate the computer and cover its own losses.

1. With 12 V battery: 150 watts from a 12 volt battery would mean the current is 150 watts / 12 volts or 12.5 amps.An 85 amp hour battery would last about 7 hours at a current of 12.5 amps. (85AH / 12.5A = 6.8 hours). 

2. With 14 V battery: 150 watts from a 14 volt battery would mean the current is 150 watts / 14 volts or 10.7 amps. An 85 amp hour battery would last about 8 hours at a current of 10.7 amps. (85AH / 10.7A = 7.94 hours) .

3. With 15v battery: 150 watts from a 15 volt battery would mean the current is 150 watts / 15 volts or 10.0 amps. An 85 amp hour battery would last about 8 hours at a current of 10.0 amps. (85AH / 10.0A = 8.5 hours) .

However, the actual current and battery capacity and inverter current would have to be measured to get a more accurate estimate. Don't forget the monitor power, though. This is not powered by the computer so it would need additional power. You could also consider using a laptop computer or replacing the hard drive in your computer with a solid state one.