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I purchased some gently used U24-12XP batteries and wanted to share my positive experience modifying/using these with a non-Valence external BMS. First I opened the side waterproof compartment to locate the 4S balance wires: Was very happy to see it was similar to a traditional 6S JST...

I'm using an ANT BMS in a 12s (3 x U24-12XP) configuration. It supports 4 temperature sensors. However, I'm running parameters that max charge at 3.5v per cell so the batteries stay relatively cool. The batteries are in an insulated garage so ambient temperature is under control.

Very nice mod! I've been looking at this inverter manufacturer. I currently have a a 36v setup and planning to go to 48v in the future. How much lower can we set the cutoff without getting into trouble? For example, on the 48v inverter, the factory alarm is set at 42v and the cutoff at 41v...

Make sense but thought it might be worth a try to check. I know Victron makes a 48v inverter that will also work for a 36v battery.

Appreciate your write up! Question - are the 5 balance wires (for 4s battery) available somewhere in the top compartment containing the proprietary BMS? Or does it require cutting into the lower battery compartment to gain access?

Yup! That's all it takes. I'm currently running an ANT BMS with 4 valence batteries (16s) in series.