Recent content by alferz

Over the past several months I spent some time porting an earlier github project called NodeJBD to support the JK BMS. This is a node.js written application which polls active data parameters from the JK BMS and displays on command line, or the data can be published to MQTT and read by other...

I heard back from JiKong and one of their Alibaba sales partners — apparently the write function was disabled at least in the current revision of the BMS they sell such as the B2A8S20P and writing parameters via rhe GPS port is currently not possible. The information in the protocol spec is...

Here is how I connected mine. This is a Heltec branded version of the JK B2A8S20P. The top heatsink is screen printed a little differently but its otherwise identical to the JK. The 3rd port over when viewing from the bottom is a 4-pin, Micro JST 1.25mm port. Some of the JK versions have this...

Mine is 3.3v on the rxout pin. Vout is full battery voltage so be careful with that one (i dont use it) I think in a few years we will see BMS with native wifi and built in web status. The industry just isn’t quite there yet.

Yes, or half way around the world for that matter. But you have to work for it. JiKong not making it any easier for you. I view my battery status using a custom nodered dashboard i built as a single page web app from my ipad or phone. Some use grafana or other ways to display the data. But it’s...

First off all things JK BMS are rather mystifying due to multiple sellers and nascent documentation. The way I understood it, is that the JK BMS is manufactured to be capable of speaking any of those protocols, but it's activated in the firmware prior to shipping, only if you pay. It's kind of...

@NEEY Electronics if you have any insights here please advise!

Thanks, super helpful, I got these cmds to work with my B2A8S20P, and I see that the byte at position 11 (Transport Type) must be set to 0x02 "BMS Active Upload" for the write command to work. Unfortunately I still havent been able to get the BMS to accept the password after trying about 250...

@pacman that’s great that is one of the things I’d like to be able to control remotely as well. I’m working on a mqtt loader for the jkbms to interface with my victron nodered ESS mode 3 implementation for the multiplus-ii. Could you share the command you used to switch charge/discharge on and...

I think this is a question @Steve_S or @upnorthandpersonal may be able to answer. I'm trying to write a python script that can write data to the JK BMS via USB-TTL. I found the documents here, specifically "Communication protocol between monitoring platform and BMS.pdf". There is also a...

Try an active balancing BMS such as JKBMS if you get an opportunity to switch it out. Their 2A active balancer made a huge difference with my slightly mismatched 248ah 8s pack.

After struggling with the passive 150ma balancer on my JBD BMS, I decided to try the JK 8s 2a active balancing BMS (JK_B2A8S20P). Wow, what a difference. In only 40 minutes the JK active balancing BMS equalized a 125mV cell delta down to 15mV, something that would have taken many hours with the...

One thing I’ve noticed about both of my 8s packs, is the JBD BMS really doesnt seem to balance at all when the charge current is zero. I can let them sit in absorb at 27.8v for 2 hours without the 44mV and 42mV cell delta moving more than 1 or 2 mV. So thinking balancing under current was the...

So far mine holds at 60mV between cycles, the balancer doesnt make much of a dent beyond that (20mv diff to balance, 3.4v or above only, and whilst charging and discharging). Prior to manually in place top-balancing to 28v (ie while in series formation, not on the bench and in parallel) I was...

Is there such a thing as a normal, or acceptable range, for the cell voltage differential at top of charge? Strictly as an example, if a 230ah 8s pack stops charging at 27.8v, leaving it’s cells with a [min, avg, max] of [3.440, 3.475, 3.498] and thus a 58mV cell voltage delta/differential...