- Jul 10, 2018
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Hi
I'm having a back ups which doesn't charge it's battery. I'll explain the whole thing. The UPS was in shelf for six months. Since the battery was bad, i changed it with new one. Specs same, except the old battery was 9ah, new one is 7ah. On this 300w capacity UPS, I had a load of 190W running. In the beginning, it gave just 2min of backup with this load. By some approximate calculations, it should have lasted something like 10mins min. But i just left it at that. For a few days more, it used to charge the battery only as much as to have this backup. Even if i left it for 3 days to charge, the same thing. The next week saw even a lesser backup time of 30 sec. I thought the battery was bad, and got it replaced within warranty. But even with the new one, it did the same thing(ie, 30sec backup). But some days ago, it stopped charging the battery altogether. Even if i turn on the ups with zero load, it would give the on beep, battery low beep and just shut down in 5 sec. I left it to charge for 3 days time(as in it's manual). Still the same thing. I opened it up and checked the open line voltage between the terminals of the ups supplying power to the battery (after disconnecting the battery). It just showed 11.61V which is way too low to charge a12V battery. It should have been something like 13.6V. The battery was at 11.43V, obviously because it didn't receive enough voltage to get charged. Sorry for the long story, but what could possibly have gone wrong with the UPS?
I'm having a back ups which doesn't charge it's battery. I'll explain the whole thing. The UPS was in shelf for six months. Since the battery was bad, i changed it with new one. Specs same, except the old battery was 9ah, new one is 7ah. On this 300w capacity UPS, I had a load of 190W running. In the beginning, it gave just 2min of backup with this load. By some approximate calculations, it should have lasted something like 10mins min. But i just left it at that. For a few days more, it used to charge the battery only as much as to have this backup. Even if i left it for 3 days to charge, the same thing. The next week saw even a lesser backup time of 30 sec. I thought the battery was bad, and got it replaced within warranty. But even with the new one, it did the same thing(ie, 30sec backup). But some days ago, it stopped charging the battery altogether. Even if i turn on the ups with zero load, it would give the on beep, battery low beep and just shut down in 5 sec. I left it to charge for 3 days time(as in it's manual). Still the same thing. I opened it up and checked the open line voltage between the terminals of the ups supplying power to the battery (after disconnecting the battery). It just showed 11.61V which is way too low to charge a12V battery. It should have been something like 13.6V. The battery was at 11.43V, obviously because it didn't receive enough voltage to get charged. Sorry for the long story, but what could possibly have gone wrong with the UPS?
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