Converting a UPS Battery Backup |
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| My Favorite UPS died. It is a Cyberpower 1500AVR-HO. So I took it apart and checked the batteries. They are supposed to be 12 volt batteries but they both measured around 5 to 7 volts. I hooked them to a car battery charger and nothing registered on the charging needle, so they are toast. I checked on line and these batteries are around $25 each plus a hefty shipping charge because they are really heavy. I took the UPS down to my garage and hooked it up to a pair of deep cycle marine batteries and it worked again! Ok so now I am thinking I should just use these deep cycle marine batteries. They were being used for a solar panel experiment, but they have just been sitting on a charger for a year or so doing nothing. This UPS was powering my whole network, router, modem. My business computer with two printers, a 500gb network hard drive and my cordless phone system. These batteries would give me a huge run time if the power fails, which is has several times in the past. |
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| I had two of these just laying around doing nothing |
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| My UPS used two 12 volt batteries in series and so I hooked up the two deep cycle batteries in series I solder up a jumper wire and two lead wires using 10 gauge copper wire. On the ends of the wires are very large ring terminals that can fit over the battery post |
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| I drilled out this piece of wood so that it could sit on top of the batteries The holes are where all the battery post were on the two batteries This will keep the wood from shifting around on top of the batteries The UPS will sit on top of this platform and be off the floor The UPS cooling fan used to suck up dog hair when the UPS sat on the floor I have two shop dogs that shed allot of hair |
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| I removed the lid on the UPS and pulled out the two old batteries. The black and red wires shown in the image above went to the old batteries. The old batteries were in series and so there was a short jumper between the two batteries I used a Dremel tool to carve out a couple notches in the plastic case and then fed the two battery wires through the notches. The wires on the Marine batteries have soldered terminals that plug into the wires on the UPS |
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| And here is is all hooked up and running. The wire connections to the UPS are on the back side And as a final test I yanked the UPS plug from the wall with all the gear plugged in and running One 8 core AMD computer and a wide screen monitor, a 500gb network hard drive, Router, DSL Modem, Cordless phone system, two printers, and a creative surround sound system with a powered sub woofer It all ran fine and so the experiment will continue Hopefully the UPS can keep the Marine batteries charged up properly |
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