Would it take 1443 9-volt batteries to build a backup for my computer?
Posted November 9th, 2009 by admin 3 Comments »
baughbe.geo asked:
Just curious and want to know if this is about right. Voltage goes up in series, so to reach 117 volts, you would need 13 9-volt batteries in series. Given a rating of 500 milliamphours per battery and amps go up in parallel, and a 500 watt power consumption on my desktop, then with P=V*I or I =P/V resulting in 55.5 amps or 111* 0.5 amps so you’d need 111 parallel blocks of 13 batteries in series or 1443 batteries total to run the computer for about an hour. Correct? (Don’t ask me why I want to know this, I’m really not sure myself)
Yes I know this is DC not AC. A backup unit has DC batteries and a transformer, I am omitting the transformer bit. Also the 9-volts are rated 500 milliamphours (0.5 amps for one hour) approximately. I wouldn’t actually do this, too expensive anyway even with a bulk order discount!
Just curious and want to know if this is about right. Voltage goes up in series, so to reach 117 volts, you would need 13 9-volt batteries in series. Given a rating of 500 milliamphours per battery and amps go up in parallel, and a 500 watt power consumption on my desktop, then with P=V*I or I =P/V resulting in 55.5 amps or 111* 0.5 amps so you’d need 111 parallel blocks of 13 batteries in series or 1443 batteries total to run the computer for about an hour. Correct? (Don’t ask me why I want to know this, I’m really not sure myself)
Yes I know this is DC not AC. A backup unit has DC batteries and a transformer, I am omitting the transformer bit. Also the 9-volts are rated 500 milliamphours (0.5 amps for one hour) approximately. I wouldn’t actually do this, too expensive anyway even with a bulk order discount!
