Recent content by tilroh

that's a good idea. Maybe this winter I'll open them up and perform a different type of cell balancing.

I was away and returned to see this; I switched balance to work when not charging. I'll balance for a few days till the high cells come down and start charging again.

Thanks Mr. S. I was and still am scared silly of those caged electrons constantly looking for a way out. (don't drop the wrench!). I go slow. I learned about magic smoke from 18650s.

I see 90% of battery charge on the BMSs about the time it drops from 40 to 13V. But I really don't know. This is my first build. If I knew then what I know now......

Here's the link (Alibaba). It comes standard charging to 29.2V but I asked for 28V. It starts at 13A then after a few minutes goes to 40A and stays till about 90% then drops back down to 13V. I wish I'd ordered it with CANBUS so I could customize it.

I have a Chinese, waterproof 40A charger that I specified to cut off at 28V. If the batteries are balanced, the charger cuts off before the BMS does.

here's a 1 minute video of the batteries accelerating the boat to full speed and an emergency stop. It's a sailboat but the mast wasn't on for this test. The motor will pull over 100A at 24V when applying full throttle from a stand still. I cruse at 35A which is 4kts. The boat had no motor...

I only charge till Starb #2 hits max so the other cells can get more charge. ok, stopping at 3.5 would prevent me from getting concerned about the growing difference in cell Vs that happens after 3.5v

I envy you guys with accessible batteries. Mine are hidden away

yes it can but Starb #2 is my hot cell and always reaches 3.65 first. I just started charging with 24V. Will post an after pic later today.

yes, it can but #2 cell is always the first cell to break 3.65 even with balancing starting early.

I guess I did. Here's what it looks like now.

Thanks again BB, I set full cell V to 3.650 and now both BMSs are reading 90%. Cheers!

Thanks BB, I'll change the Cell Full voltage. I checked the BMSs and the starb. BMS (the one in the first pic showing 13%) is now showing 91%. I haven't even touched the old iphones I use to monitor or charged or dis charged. (!)

Thanks, I have 2, doing the same thing but to different degrees. Both read 100% after charging but soon after applying a 70A load, they dropped to 39 and 13%. I've had the batteries a year and the BMSs have not had an issue till now.