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will.stedden > bonkerfield

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6/19/2023 04:44:00 PM

I can say that I have built 2 systems now that have charged at the same time as running, and all I did was put the charge controller output in parallel to a single standard Hailong type 48V battery. If the charge controller is working properly, and you are using a battery with an integrated BMS then I can't think of a reason why it would be any more likely to overvoltage than when just plugged into the wall. (If you are putting your 4 batteries in parallel at the same time, I don't know what that would do.) Keep in mind, I've only used the solar through 100-200 cycles (or partial cycles) total thus far, and charged those same batteries maybe another 100-200 times using the wall charger. I don't really have any way of knowing how much more dangerous it'll be after I hit 1000 cycles or more. One other note: I also went so far as to experiment with regen braking. That turned out to be a big mistake as it didn't have any voltage limitation on it and actually melted the plastic around the battery prongs. On the other hand, the battery appears to have survived even that mistreatment and has run another 6 months after I did that without any trouble.