James,
Agree on the BMS system. I have both a monitoring and balancing system for my AGM’s and there is no way I wouldn’t spend the bucks on a LyPo4 setup just for the peace of mind. Was just wondering about the level of abuse we as constant users rather than drag racers would subject the batteries to. Thanks for the info.
Steve in Solomons MD
Lagoon 410 SE
In regards to the needing or not needing a BMS. If you are going to go the no BMS route only hook two things to your pack: the motor controller and make sure the low voltage cutoff is set high on it, and the charger and make sure the high voltage cutoff is set low. Do not hook up anything else especially not a pack voltage to 12v transformer or any monitoring equipment that draws from the pack. And plan on ever few months setting some time aside to check the balance of each sell. One bad cell could cause a run away failure of cells other wise.
With a per cell BMS you can be a lot more lax, as it would give you warning, and cut off charging if even one cell get to high or low. So you can set the low and high voltage cutoffs more aggressive. Therefor getting more ah from the same pack.
Either case works just depends on your comfort level doing the bi-monthly balance check. If I remember right you run a 144 volt pack so be extra careful when you are testing each cell. If I were you and not going to use a BMS I would set your pack up so you can brake it down to 48 volt packs for the testing.
Personally I run a BMS on my current EV because I really do not want to think about the pack when I am not using it. But that just me.
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