Hello, I have had the fortune (Or the misfortune, if you ask my wife) of inheriting some sealed lead-acid batteries from a computer room that was dismantled. The batteries are made by C&D Technologies and are model Liberty 1000 Series LS 2-600, made in June 2001 and put in production in 2002.
Each battery (I have 8 of them) consists of two 2.17v cells, each of which is rated at 600Ah. My plan is to use a UPS that is defunct because of its battery (APC 1400) to keep six of these batteries connected in series charged at all times. Six batteries with two compartments would yield 24v. I would then tap the 24v to power a DC-DC PC power supply and some lights to power my house.
Eliminating the lights from the equation, assuming that my PC uses about 150 watts when connected to 110vac and that the PC-PC power supply has the same efficiency of the current PC power supply, how much backup can I expect out of these batteries? I have calculated
150w/24v=6A, and that my batteries will have 600Ah@24v, I should have about 100 hours. Is that correct?Also, assuming that the batteries have been taken care of, how long of a life can I expect from them? The batteries are in my garage and the temperature will reach about 40F during Winter. Is this really bad for these batteries?
Finally, should I use a relay to disconnect the batteries from the UPS during a power failure, or should I go with a circuit?
If anyone has done something like this before, I'd be interested in knowing some details, too.
Thanks, Ross.