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Opinions on this BMS
#11
lifepo4 bms (top passive balancing) 1.6A max
https://www.ev-power.eu/Battery-Manageme...-1-7A.html

i'm going to buy it. and test (no test found online)
Building Lifepo4 Powerwall - atm 1400 cells growing

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#12
I am on building an overkill active balancer for my powerwall, When the project gets more than just planning, I'll start a thread about it. It will have a max of around 5A continuous balancing current.
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#13
(02-13-2019, 12:37 PM)emuland-metroman Wrote: lifepo4 bms (top passive balancing) 1.6A max
https://www.ev-power.eu/Battery-Manageme...-1-7A.html

i'm going to buy it. and test (no test found online)

These work very well, they turn on a little bit high for my liking , but well within battery manufacturers specs
I actually use them in conjunction with a 'normal' bms. 

if you have 8s or higher, these work -very- well, starting to bleed a little bit at 3,47V and go full bleed (1A IIRC) at about 3,55V for 16s packs you can't beat the price... Ow and they have LED's Wink
you'll also have to combine these with a bms.

https://www.aliexpress.com/item/3S-16S-H...l?spm=2114
www.ShipCraft.nl
Electric Ship Propulsion, Second Life batteries and Energy Storage Systems
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#14
i have bought that 2 month ago.

tested yesterday, but seems start to bleed too late.

Fast charge 10A and 1 cell hit 3.7v.

need to check with more time.

there's a xst splitter? (1 from battery then more to bms/balancer etc)
Building Lifepo4 Powerwall - atm 1400 cells growing

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#15
(02-28-2019, 11:30 AM)emuland-metroman Wrote: i have bought that 2 month ago.

tested yesterday, but seems start to bleed too late.

Fast charge 10A and 1 cell hit 3.7v.

need to check with more time.

there's a xst splitter? (1 from battery then more to bms/balancer etc)

are you sure you have the correct version? (LiFePO4 - 3.2V)
www.ShipCraft.nl
Electric Ship Propulsion, Second Life batteries and Energy Storage Systems
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#16
(02-13-2019, 02:46 PM)LEDSchlucker Wrote: I am on building an overkill active balancer for my powerwall, When the project gets more than just planning, I'll start a thread about it. It will have a max of around 5A continuous balancing current.

With every respect, what is the reason to hav e such a powerful balancer ?
0,8kWp in Test
4 kWh battery target
Ultra low cost
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#17
There's no real reason for the high current yet, it's just the fun of building it, and the mosfets I'll use can handle the current...
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#18
(03-02-2019, 10:10 PM)LEDSchlucker Wrote: There's no real reason for the high current yet, it's just the fun of building it, and the mosfets I'll use can handle the current...

The limiting thing here isn't really the current, you can easily have mosfets that'll do way more than that. At some point you run into an issue with heat. 
I've got a balancing board in the public domain that does 4A - the mosfets can do over 10A, but the limiting factor is the JST-XH connectors that really shouldn't be pushed too hard.  Since it's on EasyEDA - you could easily clone what I have, and make some changes to have it suit your purposes.  Change out the connectors for something higher duty, and route the gates from the mosfets to the nano that's onboard and you can have a ready to go board. The board already has a ton of temp sensors to monitor temps of the mosfets, the board, and the balance resistors. Also, it has a buck on board with a 4-wire connector for a fan - so you can have active cooling kick on when that sucker turns into a toaster.
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#19
(02-28-2019, 11:30 AM)emuland-metroman Wrote: i have bought that 2 month ago.

tested yesterday, but seems start to bleed too late.

Fast charge 10A and 1 cell hit 3.7v.

need to check with more time.

there's a xst splitter? (1 from battery then more to bms/balancer etc)

You are using these Balancers out of their intended use, or out of his possibilities.
The balancing current is for balancing, not for surging unlimited Load current when the cell is full.

The high current must be reduced by another of the BMS functions or in the charger circuit, or another overload prorection should hit.
0,8kWp in Test
4 kWh battery target
Ultra low cost
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#20
pack was 80ah
Building Lifepo4 Powerwall - atm 1400 cells growing

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