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Unfortunately I have to say, that two of the actice balancer BMS JK-BD6A20S-10P I bought from D.YU.K.B Dykbhuang Store at Aliexpress are dead after a few weeks of usage in my 16s powerwall at the garage
both seem to have "lost" some batteries. The first BMS lost batteries no.
01, 02 and 09
I first checked the cable connections. I checked it twice and three or four times but could not find any problem.
So I replaced the whole cables but the problem staied.
At the end I replaced the bms with the same, new type of BMS
but after few weeks it losts some batteries too, this time no. 01 and 16
Again I checked all cables but could not find any problem so defnitely a failure of the BMS.
Maybe a bad charge of production.
In total I am using seven of this exact identical BMS and the others run just fine, some of them non-stop since one year.
I contacted the seller on Aliexpress, D.YU.K.B and Dykbhuang Store and he agreed to refund the two defective BMS after sending it back and so I did so
But because he did not confirmed the arrival of the package in time, the dispute was closed autimatically and there is no refund.
I wrote several times via contact form and the seller agreed one more time to refund the defective devices but now, six weeks later there are still just some delaying tactics and no refund.
I guess it's my fault because I thought the chinese seller has some honor and will hold his word, but it seems this is not true.
So all I can do now is warn you about this seller.
I guess next time I need a smart BMS or active balancer I will order at ICGOGOGO again. It's three or four bucks more expensive, but service is definitely better.don't buy at dddddo
User's recommendation: do NOT buy at D.YU.K.B Dykbhuang Store.
Monetary Loss: $140.
Preferred solution: Full refund.
Aliexpress Pros: Cheap.
Aliexpress Cons: No service, No refund, No guarantee, Lies, No honor.