How long does a UPS supply power
Hello, I recently got an Infosec E4 LCD LT UPS, unfortunately the two batteries that came with it were dead, so I replaced them with new ones same capacity and voltage (12v & 7Ah), then I downloaded the software to tweak and monitor the UPS, the temperature is normal 18°C, the output power is 220v 0.5A at 50Hz, which only 12% of the load capability of the UPS.
The batteries take a very long time to get to 100% but when I remove the plug from the outlet to test the UPS then it can only supply power for a maximum of 5mins .
If I’m not mistaken, the batteries voltage is 24v and their capacity should be 3.5Ah since they are in serie, which means 84Wh and I’m consuming 110W (assuming the load as DC current), so it should last at least 45mins.
I didn’t find any approximations in the internet to have an idea on how much time a UPS should take so I hope I don’t have bad batteries, but if so then the fault alarm must be triggered, like when I test it the first time with the dead batteries.