Recent content by mjp8081

So every time I go to charge either my LiFePO4 or my RC lithiums, both 4S, the first, or maybe its the last cell, the one first in the list, always overcharges about 0.3-0.5 volts over the others. I switched the cell order and tried 3P to make sure it wasnt the cell. I tried to discharge them...

I want to build a lithium lead acid replacement type battery bank for a solar and alternator powered RV (12.8v ~100ah, ~80a), on a budget. Whats the cheapest source and or type (18650s, prismatic, etc) for cells? I was thinking about maybe salvaged EV block cells, or someone online that...

I've been asking around, havent got a clear answer to this: I want to build a 12.8v 100aH 100 amp peak battery bank for a solar system/alternator on an RV. I have some existing Chinese LiFePo4 batteries (banks,4S60P 18650 cells ) with BMS on board that function like Lead Acid in that they...

So good news, I connected it (in reverse order basically), it read and balance charged no problem--so WIN. However, the 4s60p pack will not charge over ~12.8v, while my other packs will go to 13.4v--the Accutel stops charging, says "reached capacity" at about 13.1v then drops after down to...

OK, thanks, also I found this: http://www.tjinguytech.com/charging-how-tos/balance-connectors Sorry for all the ignorance on my part, I get it now. The first and last wires will be neg only and pos only, the ones in between are connected IN SERIES (duh) I just need to find that type of...

Yikes--Ok first off all THANKS sincerely, for all the 'splaining, taking all the time to help me figure this out. Now after reading all that twice, my little brain hurts and I still cant picture it. But here's a thousand words about my lead as I tested it, this is what I do know: Now what...

I guess what im not sure about is: So the balance port(s) pins going in to the charger are 1st pos, 2nd neg, 3rd neg, 4th neg, etc. like RC lipo packs. If I wire a plug that is 1st neg, 2nd pos, 3rd pos, etc., like my lifepo4 balance lead, wont the polarity be a problem? Or can the Accutel...

I will keep that in mind and post accordingly, thanks :oops: . I do want to say I dont start new threads thoughtlessly, or purely for my benefit or to bump up to the top The way I've approached forums is that I'm thinking of other people (members or not) with the same problem, can search and...

I have a Turnigy Accutel 6 I use to charge the RC lipos for my eMTB. I would like to balance charge y 4S LiFePo4 pack that I think has a BMS type wiring (as in picture). The Accutel is wired for RC packs, which has the opposite wiring (one pos/4 neg). I'm not even sure the voltage is...

Thanks sunder yeah its 5 black wires all connected/soldered to the board "in", and 5 soldered together coming from the out point of the board (then going underneath back to the cell pack) 10 total 12g neg wires.

Thanks guys I should have been more specific...there are fat 5 Fat (~12g) black wires soldered together touching, to the board going in and then out. Which I'm pretty sure one cant be positive. So it was a bad BMS...man these things are crap. I'd really need a good replacement. Are there...

I need to replace this, from a 4s60p "deep cycle lead acid auto/boat replacement" 150ah Supposedly 100amp ch/dch Single neg port/terminal, charge and discharge/load common input/output(no separate charging input) like lead acid. One question is: why are there 5 wires going in and 5 out if this...

Thanks, case closed.

This (shunt resistor, current sensor?) is backwards, do these require current to flow a certain direction through, or does it not matter?

thanks for that, one more question: so this is a 4s configuration, but there are 5 fat black wires going in and out of the bms. What its the fifth wire?