Thread Rating:
  • 0 Vote(s) - 0 Average
  • 1
  • 2
  • 3
  • 4
  • 5
Chinese BMS boards
#11
Can you tell us exactly with what BMS you want to do this, because if the balance mosfets can handle the current, then it shouldn't be a problem, if not it will probably burn the mosfets.
Reply
#12
Dallski and Ledschlucker, in the end my recommendation is - either you use these chinese type BMS unmodified as a last rescue, and make the Balancing with a different unit, or you leave them off.
I have about 6 different types of these Chinese BMS here in stock, have one type (6s) in operation, have analysed this 6s, and had a short look into 2 or three others.

All of them have worked as intended, and have the same features
- 2.5 Volt Cut-Off undervoltage
- 4,1 (something) as balance start
- 4.3 (something) as cut-off overvoltage.
That is exactly good as a last rescue in terms of BMS, but unusable as balancing mechanism for packs which shall swing in the 3.3 to 3.9 Volt area EXCLUSIVELY.

The cutof voltage is defined by a component intended for that, so little chance to change that, except you change it against another type, which has 3.3 cutof (or something, had to look that up.).
LEDSchlucker likes this post
1 kWp in Test
4 kWh battery target - plus Mobile Home battery
Ultra low cost
Electronics ? No clue. Am machinery engineer.
Reply
#13
(02-20-2019, 04:55 PM)Cherry67 Wrote: Dallski and Ledschlucker, in the end my recommendation is - either you use these chinese type BMS unmodified as a last rescue, and make the Balancing with a different unit, or you leave them off.

I was talking about these little standalone balance boards good for 66mA of balancing. https://m.aliexpress.com/item/3282589918...lsrc=aw.ds
Hope the link works. Just search "7S balance board" if it doesn't.

BMS could be handled by a chinese BMS or any other BMS that doesn't handle your balancing needs if you have a really large parallel pack. I was just thinking you could modify them to handle a lot more than 66mA.
Reply
#14
I know these, and have not bought them.

You get the same functionality together with the protection features ( under/Overvoltage, overcurrent) as one of the usual cheapo chines BMS, and the same problem, that they only balance at the top voltage.
1 kWp in Test
4 kWh battery target - plus Mobile Home battery
Ultra low cost
Electronics ? No clue. Am machinery engineer.
Reply


Who read this thread?
100 User(s) read this thread:
hbpowerwall, pacm31, daromer, Sean, mike, station240, Chris, PaulKennett, Lux_Gamer, dakoal, Majorphill, Korishan, A + A, PAF, Batrium, Darmok, Wattsup, JGaspar, BobinTN, CrankyCoder, Mike C, HogensHero, eAnic, jdeadman, charlie246, camils, crud, Zagy, 2146, wim, frnandu, melsom, typ49, HandyAndy, Christian, Abarth595, kktuo, Kaspars Krumins, kaits31, watts-on, Dan Lim, jesusangel, alexcj, Hanssing, SeptimoJunio, IronSky, kot, Joost2, Stefaan De Ridder, Igor Maliszewski, Chicken, systemtm, Chris Evans, BlueSwordM, tremors, Johnny Stauersbøl, ATKAM, Cobra, Eric Koshinsky, KtB, netmonk, Seedser, Mazlem, kiwi, ivnz, Chris Davis, Geek, electricJolt, Dave Tucker II, Rad, Jon, jamesk9, floydR, AlexCPU, englisboa, David West, Jonas Goiris, hookemdevils22, Rui P, karrak, Gerard Achternaam, tomganleylee, GFPowerBatteryIT, Grumplestiltskin, Trino Mendoza, zag2me, dougal, ChrisD5710, davidpesce, Tyler, Stephen Jobson, mormor1971, Sonic01, Tostaki, tocan, badjaw, Hillbilly, howiegrapek, Stephen_Bartholomew, cristof

Forum Jump:


Users browsing this thread: 1 Guest(s)