JK 4S 200A BMS

mill said:

I have a 4s2p working this way and it works good.
Should also work with 4s3p.

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McDavid403 said:

Thanks Mill, did you need to configure anything on the BMS? Does it balance between cells or did you find your two packs ever get out of synch?

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rickst29 said:

The First Charging Test. (Passed, but the error log and display showed numerous 'abnormal' events.)

I attached a very cheap, low-power bench charger for this test. It is capable of creating voltage above 14.4V, but shuts down when battery current falls below about 0.5A. That shutdown occurred at total pack voltage of 14.22V per the display, an average of 3.543V per cell with a delta below the 0.010 limit I had set in the App. During charging from

(I calibrated 'voltage' and 'current' values via the Coulomb counter yesterday, before "blowing up" the Coulomb Counter with a surge from the "dying" Inverter. So the BMS App is now providing the best numbers which I can get. I'm sorry about that event, which prevents any further testing of the output current limits for this BMS unit.)​

During the charge process (initiated at pack Voltage 13.173 Volts), balancing occurred without issues from time to time, and with no interruption of the charging process.

However, during charging, the Stats Display blinked a warning message (in red) about an "abnormal state" being detected. Each occurrence was automatically recovered ("cancellation") so quickly that I could not read the message. This message appeared at intervals between about 5 seconds and 40 seconds, for the entire duration of the charging cycle. In the "system" log, the first 50 messages record the detection and and cancellation of the error code in pairs, each pair of log entries occurring within the same second. Here is one of the log entry pairs. The gaps in time occur after the second message of each pair:

7. Before [3H11M29S] - [Abnormal coprocessor communication]
8. Before [3H11M30S] - {Abnormal cancellation of coprocessor communication]

I think that the 2nd message has a slight translation problem (word order), and could be perhaps be worded more clearly as "Cancellation of abnormal coprocessor communication".

In any case, I am unsure whether a problem is present in the unit, or whether the cheap charger is putting out far too much THD (i.e., 120-VAC "passing through" into the DC output. I do not have an oscilloscope for measuring that.

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pau1phi11ips said:

You don't have the heater port or just the cable? My BMS definitely has the socket attached but I think I've been sold the version with the heater circuit.

I've found the cable, it's a JST - GH 1.25mm 7 pin Plug. I've ordered a connector off eBay and will give it a go with my BMS anyway

GH 1.25mm Plug + Crimps 2-12p Crimp Connector B2W (JST GH Style) | eBay

Compatible with JST GH series connectors. GH Series Crimp Connectors. GH-125 connectors are a series of board-to-wire crimp connectors. Crimp MaterialPhosphor bronze, Tin (plating). Other Crimp Connectors.

www.ebay.co.uk

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maciej said:

Hello,

I'm reading this thread for the first time, but unfortunately I've already bought two JK BMSes, one couple months ago and one couple weeks ago.

Can anyone tell me if I have the good or bad version of JK BMS? Also I'd like to ask how to update firmware so I could have the SOC voltage settings, because I can't see one.

I've got version with heating port. See the screen for details. Thanks in advance!

View attachment 182841

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hwse said:

If you bought it new you should be fine. The problem was only with the units sold in the first few months. I bought mine a week after Nami emailed me to tell me that they were available because I was on the wait list.

As they say, good things come to those who wait!

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