Question APC Back-UPS Pro BR1500G-IN always on charge with home inverter supply, are there any consequences ?


Nov 4, 2020
I have APC Back-UPS Pro BR1500G-IN, 1500VA / 865W, and recently I also setup Luminous Cruze+ 2KVA Sine Wave Home UPS with two 220 AH Tall Tubular batteries however my house load is not that much so I connected this APC Back-UPS Pro - BR1500G-IN on a power plug which has my home inverter supply after a power cut, The reason I tried this way because I have a high-end PC with Rog Strix RTX 3090 + Ryzen 5800x PC + AORUS P850W PSU build and when the power cuts off here I hardly get a minute or two back-ups from this UPS battery but now as I connected it to my inverter supply plug so whenever power cuts my gaming session didn't get inturrupted but my concern is the UPS always stays on charge and I am not sure if it is an advisable setup or not and what are the consequences because my UPS is always on the charge and not completing it's charge and discharge cycle, I know without this APC UPS also my house inverter can handle my high-end PC pretty well but for an extra layer of protection I am using this APC UPS and also the load monitoring and other feature are really helpful in this UPS via it's software and on its LCD display. I just want to know if this setup will create any issues for my home inverter or for the UPS itself. Waiting for your valuable input on this topic. Thanks
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Jul 29, 2016
Most decent UPSs run in 'line interactive' mode. This means that the load (the PC etc.) is always running off the battery/inverter in the UPS and as long as mains power is applied the battery is constantly on charge. If the mains goes down there is no switching delay involved, the load continues to run (uninterrupted) off the battery/inverter, the only difference is that now the battery is discharging.

I see no issues for your UPS in having it plugged in to an inverter rather than direct to the mains supply, as long as the inverter output is acceptable to the UPS (ie. a full sine wave) then there should be no problems.