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Very interesting seeing the inside of the SURT003.. I expected it, but dang that's a huuuge coil. Well, I wasn't able to buy batteries. Lol, I could maybe get 192v using 18650s right now. I will go for your SmartBMS suggestion, if you have anything else please let me know :)

I have still not purchased batteries for this UPS, I still intend to use it as an off-grid inverter. I believe the battery input voltage is 192v at the board. Still have not planned any further. Does anyone have experience with the 10kv model?

Sorry, I may have been mistaken. The SURT10000XLT from APC apparently takes two 192v lines in series for 384v? Could it be +192, 0, -192?Batteries for this UPC are always sold in pairs and I never had access to original packs to inspect. If anyone knows, count me Lost and trying not to cause...

I have the SURT10000xlt with a pair of transformers, sitting around for 4 years and I'm still clueless. Ultimately would like a solar powered home, but I'm stuck on building a proper battery to power it.

Thank you @Will Prowse for the forum. I have a 208V inverter from APC, SURT10000XLT. The DC input voltage is 192V, and have 2x APC SURT003 giving 120, 208, and 240 output from the inverter. I'm looking to build a battery pack and I see lots of options, so far I've settled on purchasing 16x (for...