Usually it happens if battery terminals are corroded.UPS can not draw enough current through them to provide the backup.You need to clean or change the battery terminals.Also check to make sure that output of UPS is properly connected.If everything looks fine from the outside, then problem could be inside of power inverter. In fact, UPS is not switching to backup mode. Usually, it happens when input voltage falls below the threshold of UPS.For example, if threshold of input is set to 185 V and input falls below than that, UPS will automatically switch over to backup mode no matter AC power is still available.Check the voltage to confirm if this is the case.ģ: Batteries are charged but UPS is not providing any backup. ![]() ![]() 2: It goes to backup mode repeatedly for example every 15-20 min while AC power is still there.
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