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If anyone else comes down this road, I ended up finding an affordable solution that works for my use-case. I observe ~30 minutes of battery backup at ~200 watts and cost ~$80 in the LiFePO4 batteries for each APC unit. (1) APC Back-UPS Pro BR1500MS2 with two new 12V 7Ah LiFePO4 batteries (2)...

I do not have an amp meter, so I am not sure how to measure that. I checked the user manual that came with it, but I cannot find that information.

I got a 24v 1000w inverter and a 24v 10A charger. I charged the battery up to 27.2v and then connected a 2A load to the inverter. It sustained power for 2 hours and 44 minutes. 240 watts * 164 minutes ÷ 60 = 656 watt-hours 656 watt-hours ÷ 24 volts = 27 amp-hours Oh I also got a 24v fuse block...

For anyone that ends up here seeking the same thing I am: What I want does not currently exist under $400, and a DIY solution is not feasible. I am unable to find a portable LiFePO4 power station that switches between utility power and battery power quickly enough to act as a UPS. Even if that...

Battery: 25 amp-hours * 24 volts = 600 watt-hours Test: 650 watts * 366 seconds ÷ 60 ÷ 60 = 66.1 watt-hours Seems to suggest that the space heater used about 11% of the battery's described capacity. If the battery really is 25Ah, and that math is right, then this UPS and this battery are a...

The APC UPS behaved as though the battery was depleted, but I am not convinced that is the case. The battery low voltage disconnect is 21.0v, and I never saw the voltage get below 24.9v. I do not know how to do the math to calculate the theoretical time that 25Ah 24v battery should be able to...

Hmm. I see. I guess I better not try to run it at full load then. I tested it at 650-watts, and it ran for 6 minutes and 6 seconds.

I measured the APC BR1500MS2 charge voltage at 27.27V with the battery disconnected. The OEM replacement battery contains two 12V SLA batteries in series. The third-party batteries I have been using say the float voltage is 13.6V - 13.8V. So, I believe the OEM battery float voltage must be...

Thank you for that suggestion. Does this video describe what you mean?

Hello! I have some APC BN1500M2 UPS I use for desktop PC and network equipment around my house. The SLA batteries inside only last a couple years, and I have been using 12V 7Ah Mighty Max replacements. I want to invest in something with greater longevity and more runtime. It seems like a solar...

Hello! Just another newbie. There is so much useful information here! I have got a lot to learn, but I hope I can ask some advice from knowledgeable people while I find my way with a battery storage solution. I attached a 1-page PDF with details about my situation and what I would think I want...