Recent content by bostonbuzz

The alternative plan would be to get a separate port bms, run the engine on the charge lead and the nav electronics on the load lead so if you hit a HVD, your nav electronics would still have power. NOTE: I'm ASSUMING that with a separate port bms, in a HVD the bms cuts the charge port and not...

I don’t know enough to help you. The 24V version will work for 24 volts. If it’s running 60V it would not work.

Works great. Will not function with just the control wires attached (in case you try to test it). It needs the + from the battery hooked up as well.

Well to 1/2 answer my own question. I left them in parallel for a week around 3.25 volts. Then I put them back in series and it charged well up to 14.2V with about 30mv difference at the top - I thought I was good to go. I checked back a day later, and one of the cells was 100mv higher than the...

I'm doing this, but having some trouble with balancing my cells (I'm a noob). I went with an external relay BMS and am using the Bluesea magnetic latching relays that use no power at either open or closed, and can be manually set to open in an emergency. Photos here...

Thanks guys I’ll give it a shot putting a load on and then charging and repeating. It’s not making total sense because it was balanced around 14.1v and somehow goes more out of balance as it sits. I checked the parameters. It is set to “on” for charge discharge and storage above 3.2v and...

So is it possible the cells are OK, and if I just buy a power supply and top balance, then I can just run them down and recharge and see if they match at the top again? Question is, why can't the chargery with 1.2A passive balancing keep up? Doesn't that indicate that the cell is bad?

One of my XUBA cells keeps going higher than the others in a 12v 280ah setup. Using a chargery set to balance, it is always higher. When charging @ 13amps the high cell (closest to the negative) goes over 3.65 V and trips the BMS. I believe I have a bad cell, but I haven't paralleled them and...

Well it’s a bit crowded but I fit it all in the pelican case. The relays used too much energy for my application (50w panel just to keep it topped off and slowly recharge over a week for the next weekend). I went with monster bluesea latching magnetic relays. I used used ones off eBay of older...

Thank you. I set it to 8mv. This gets back to wills criticism on the cell voltage difference parameter. I thought that 30mv was way too big, so I kept it there. Reading this, I put it to .5v. If one cell is over or under the BMS will cutoff, so no need for a cell differential cutoff. I guess I...

.025 difference left overnight to balance to 8mv, still .02 difference. 8mv balancing accuracy is the max, I’m running v1.2 software, is the update better on balancing? If the website doesn’t go back up can we put the software and manuals in the resources section?

Chargery website is down :( Trying to figure out why my balancing is so slow. 280ah 4s1p pack. Trying to top balance the hard way, letting one cell max out and cut off charging then balance with chargery before charging again. 8mv max accuracy is hurting. Anyone have a 8T manual?

Cable size is determined by ampacity. What are the amps you will be drawing? https://www.bluesea.com/support/articles/Circuit_Protection/1437/Part_1%3A_Choosing_the_Correct_Wire_Size_for_a_DC_Circuit 12kw solar charging @ 48V = 250Amps so you're looking at at least #00 or 0/2 cables. If you are...

Seen this? BMS master for U27-12XP https://www.thunderstruck-ev.com/valence-battery-bms.html

You, sir, are a lifesaver. That explains why the Chargery minimum over-voltage protection settings were so high (min 3.9v). I'm scared to charge up again without some sort of balancing beforehand. Shall I just leave them in parrallel for a few days then try charging to 14.4/3.6v? Will that...