While i was getting my payment issue resolved with liion wholesale, i happened to ask them for their opinion on who has the best BMSs and they mentioned they get all of theirs directly from China. So i asked them about the possibiliy of a group buy and they said they would probably need 10-15 units ordered to make it happen but it might be possible and that lead time wouldn’t be too bad, just a couple of weeks most likely.
Then they asked me for some specs so they could see what they could get. I told them 10S, 60Amp ish with an 80 ish burst, a soft switch, solder points for the fuel gauge, and the charge circuit set up so that the fuel gauge would light up but the mains wouldn’t energize while the unit was powered off and charging. I’ve had enough of the VESC-Wifi twitching. lol
So now i’m waiting to hear back from them about what they can do. If they can do this, who’s in and for how many?
@longhairedboy moving this detail to the group-buy thread…
I got a quote today from Bestech for this BMS. Price is $49.50. Minimum order is two. I’d love it if someone here who has experience selecting BMS’s could take a look at the specs and help me to understand whether this is a good choice for 10s3p. It seems to be aligned with what we’ve been looking for. It’s even more robust with 80a continuous discharge and 20a charging. Also is wired for a power switch.
I’ve got a note in to Bestech about group pricing, shipping costs, and whether they have a model that provides charging leads that are separate from the power leads (I think this might be the way to accomplish a fuel-guage when the power is off).
Also, is it strange that to charge 10s on this model, you have one 8-port JST connector for most of the balance leads and then a dual in another place on the PCB?
@longhairedboy@lox897 Yes, I’m planning 10S3P… but I think the idea is that I wanted a BMS that was robust enough to handle any hi-amps pulls that might occur; so a little bit of overhead with 80A. I think that I’d keep VESC set at 60A continuous draw, although I don’t think I’ve ever pulled that much. I’ll adjust the voltage cutoffs accordingly. As @longhairedboy notes, adjust the charging rate and voltage to match. Does that sound right?
Come to think of it, though, How would I limit charging voltage if the charger doesn’t have any setting? If this BMS can only deliver 42V, I might need to reconsider. I guess I would just get a charger that tops out at 37V? I’m not sure that makes sense…