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Get onto chat and see if Hankzoor can clarify about your order. They are usually good at responding. Should be able to test startup and powerup with your variable power supply, remembering these units need an extra +5V to startup. The -ve is the first black and +ve is last red.

@Mariner62 how are the B Grade cells supplied by Luyuan performing?

There is a statement on the forum @Nami that there were about 20 units initially JKBMS 4s-8s that had a DC DC converter ( because the basic circuitry of the JKBMS needs >25V) that consumed current and become hot and unstable. This DC DC converter chip has been replaced to a more efficient one...

Old thread I know, but looking at adding a 12V LiFePOr 105AHr DIY pack from Luyuan for camping trips. Many of the DC-DC chargers appear over marketed and are sold as suitable for all battery types with the appropriate label. Renogy to their credit at least provide info on their profiles and even...

If this is true then we will see unmarked cells A grade cells manufactured after 1st June and B cells with a "B". Will this be helpful? Going to be a lot of "C" grade cells with "B" on them for the fake market.

Ok, back to the real world, which balances faster a JK 2A Active balancer, A 4A Neey Active Balancer, or Heltec Capacitor Balancer?

Interesting thread - can OP please report back and show us an image of the JK-BMS app with pack voltage at 27.5V, hopefully by now the active balancer will be bringing the cell voltages into line and demonstrating that an active balancer is an alternative to top balancing in parallel.

The 8S 2A 200A JKBMS (AU$182) is substantially cheaper than the 24S 2A 200A JKBMS (AU$274) So have they added a step up converter to >40V in the 8S unit or changed the circuitry to require a lower voltage? Just thinking about how to setup a JKBMS 8S 2A 200A as a combined BMS/active balancer for...

And if they are the older models with a minimum of 13S LiFePO4 then 12V-36V DC-DC Converter - smallest one should work https://www.aliexpress.com/item/4000750422496.html

Should be a great system JK BMS+ Luyuan is a quality combo on this forum. How did you end up paying? My understanding is paypal transaction adds an extra 2.99% by the vendor. I am negotiating a sale with Amy@Luyuan and she tells me TT is cheaper. I am prepared to forego any extra security...

If you can be sure how the flooded lead profile behaves as you describe them you are in a safe zone. Redarc are probably the duck's nuts re DC DC chargers and do actually publish details of their BCDC chargers. In LiFePo4 mode they go to 14.5V and float at 13.6 and return to boost at 13.2/13.4...

Luyuan (and @Steve_S say charging up to 0.5C is ok (50A) so max rate is ok. Alternator is either 75A or 90A The concern I have about the "Lion" profile if I start with fully charged pack and drive for 3hrs and stop the SOC will be less the load used for 3hrs from fridge as no charging occurs...

I agree that using the average cell voltage will start the balancing process later, but in that scenario you describe manual adjustment of max charge voltage should help. What max charge voltage were you using? With a start balancing average cell voltage of 3.4 and a max voltage of just over...

It would be great if under voltage and over voltage could have separate outputs rather than the same protection mode. In current features will setup so that under voltage protection mode trips and disconnects inverter and leaves PV charging intact. Any recommendations for 48v 100amps max...

Means nothing when av cell voltage is only 3.29V. What is delta V at 3.5V?

Our resident Laplander recommends some special goo that is anticorrisive and helps conductivity.