Re: Home UPS powered by car battery: failed

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Re: Home UPS powered by car battery: failed

Batteries that aren't meant for deep discharge will sulphate if they are deep discharged even once. Once they've begun to sulphate, it only gets worse.

A "12 volt" battery at 12 volts is quite low as fully charged they should be at about 13.8 volts. The UPS is gonna check the voltage to determine when the battery is getting discharged by checking the voltage. So although you have a higher capacity battery that could maintain current for longer at the lower voltage, the UPS has already decided the battery is nearly discharged and it's no longer safe to continue.

permalink · 2007-09-21 23:29:59 · Print ·

Axilla Finger, Finger Premium,Mod join:2001-03-26 Schofield, WI clubs:	Re: Home UPS powered by car battery: failed In fact when you start getting into big "12v" batteries for backup power applications they recommend float charge voltages that can be all the way up to 14.5 volts depending on the battery type.
	permalink · 2007-09-22 00:11:40 ·

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