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This is the info I've been looking for! I also have an old APC Smart UPS 1500, as well as an even older APC 1000, or 1200 watt model, that are both identical in size and number of 120 volt outlets on the back. I stopped buying replacement batteries for both of them several years ago, because...

Well you have had much better luck that I have for the lifespan of replacement AGM batteries in your UPS systems. The last two times I have replaced my batteries with what I could find on Amazon, they only lasted just over a year before they were dead.

I agree, it makes no sense to throw good money into bad equipment, but I'm willing to upgrade not only the batteries, but also the inverter and include a BMS, to make my old APC Smart UPS 1500 and even older 1000, or 1200 watt model, into a modern LiFePo backed up UPS. I just need the advice on...

I'm adding to this thread instead of starting a new one, so forgive me if this highjacking of the thread is out of line. I also have an Anker 767, and purchased ten 100watt Renology (I think that is the correct spelling) solar panels and five 10 foot long cables that have the standard...