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I've got 3 of these... they're on 200Ah cells.. I am so grateful to have gone with this one as it's the only one on the market with 2A balancing. everything else is in the mA's... I saw Will's YT video on why he thinks you don't need more than a few mA's for balancing but the reality is, if...

I'm already doing this.. i have 3x 16S packs, each with their own JKBMS, all connected together in parallel. In fact the parallel connection is then also connected to two inverters in parallel.. the higher voltage pack does end up slightly charging the lower voltage pack and you'll see this on...

There's a YT video from Will which basically says active balancers are useless and that you don't need a high balancing current... but he casually caveated that remark with "if your cells are new" or something... I don't know where people are sourcing their cells from but I'd imagine not many...

LOL yeh I can solder and so can most others, that's the easy part. What I meant was, not everyone's gonna be comfortable taking apart a brand new BMS that ain't broken. so if we can get a plug-n-play solution, that makes the solution far more repeatable and supportable for ourselves and others...

there's a reason why that won't work for me because of cell imbalance and the inherent discharge curve of LFP cells which I responded to in another thread (https://diysolarforum.com/threads/does-it-make-sense-to-have-my-bms-only-connected-to-my-battery.21890/post-258816) tl;dr tho, basically the...

There's a few things I'd like to pick with your post.. What does that even mean? ma is a measure of current.. not capacity or voltage, that isn't really a measure of health of cells? Health is usually measured as either internal resistance, or variances in voltage between cells, or mAh total...

FYI I ended up mapping (almost) all of the request commands from the BLE comms. But it seems to be a completely different protocol with different headers and structure despite being also a JK BMS. I've sent those over to jblance so he can update his program when he's ready.

Found a better way and saved myself a handful of RS485 adapters whilst I was at it... as i mentioned earlier jblance publishes a python program on github and I managed to get it to work over Bluetooth BLE. Also confirmed I can connect to multiple BMS's "simultaneously" (in separate instances of...

Yup so that's the same as what I've got. I've got the 24S bms, 200A current with active balancer (2A) .... I wish the 2A was higher though. Jikong was willing to customise it with a higher current balancer for me but MOQ was like 100 units and I'm not made of gold... so... That's the part I'm...

I tried the switch method (but just by using a jump lead with the resistor). Didn't seem to wake up the inverter. As in, it did nothing. The only time it wakes up is as per the manual, 5V+ to the B- (blue cable) side, and 5V- to the P- side. Well in my case i had a spare 12V battery to do it...

I ended up going for the jikong 200A BMS instead. Similar price to the Daly (actually cheaper), but you can program all of those specific parameters yourself. Also the Daly's balancing current is only 30mA... U do the math on a 280Ah cell... How many months will that take to balance a...

That's what i started off trying, and at first it seemed to make sense since the inverter can shut off in an under voltage event. The problem is that no cells will be identical, even brand new ones, despite best manufacturing efforts. If you look at LFP's discharge curve, the voltage drops...

Out of curiosity.. Not a dig... Why can't you use your BMS as a battery switch? Isn't that one of the core functions of a BMS? Literally without it, it'll just be called an "active balancer"... So I'm not seeing the adverse effect here...

fair enough, you have a good sized system I believe, your batteries outsize your solar by a huge margin, and your solar outsizes your usage by a fair margin. Hence with that in mind, as I said your system is barely under any stress, so you should see plenty of life left in it. The danger with...

LOL Hey I'm new too... looking for basically the same thing. The JKS BMS does provide a serial comms documentation kindly shared by jblance's project on github but the documentation is very limited. There's just a few query commands but nothing that allows you to set the advanced parameters that...

Hi guys Anyone know of a product (links will be great) that can monitor the voltage AND DC current (in and out) of a 12V bank, wirelessly? (either Wifi or Bluetooth, ideally with phone app, but not a deal breaker if i have to write my own code)... Basically most of the better BMS's already do...

@DIY-Dan in my case i decided not to go for the RS485 cable because I realised the RS485 was just going to be a tethered version of the built-in BLE.. if the phone app can do it why use a cable... I'm waiting for my new BT-BLE USB dongle to arrive which cost just as much as the RS485 anyway and...

I'm not using SA (actually I'm just not smart enough to set it up, I'm a Microsoft guy so when i started this a couple years ago, even a bash script was alien language to me, let alone python), so i wrote my own .netcore code that sucks up BLE data from the JK's and PI17 over hidraw (USB) from...

Ooooh i was curious about that! So u got it working? I never bought the RS485 module and have always just used BLE. I was the one who captured all the BLE packets for Jblance so I've been using it in production for more than a year now. But recently I'm having BLE instability issues and was...

I've got the new version (hardware 8 maybe?), cant remember if HW6 is the same, but this is where it gets interesting. It's a JST GH style socket but the pitch is 1.0mm. I cannot find anyone selling a JST GH 1.0 male socket. There are plenty of JST GH 1.25, but not 1.0mm. and it's also a 3 pin...

that's what gave me the nasty jolt https://diysolarforum.com/threads/heltec-jk-200a-smart-bms-with-2a-active-balance.17831/post-263586.... but no actual damage. my 12V is only a tiny one and it's still working fine, BMS was fine, pack is fine, inverter was fine... In hindsight I think my jolt...

Ahh ok... My (JK) BMS makes a very unique sound when it engages.. It sounds like clanking two water-filled glass bottles together. The way I've configured my BMS, it cuts and engages every time the battery's low (long story), one morning i got over 800+ email notifications from my inverter that...

I'm still new and not familiar with all the inverter types but the issue if that were my setup (hybrid PV inverter) is that when there's PV again, the inverter will be able to charge the batteries but it's got no way of waking up the BMS again since it's technically on a separate circuit holding...

Didn't want to risk losing warranty by breaking the seal to open them up. Already had to send one back for warranty repair/replacement. Besides, if I take it apart and start hacking the connectors etc, that isn't necessarily gonna help the next person who's not comfortable doing that, so ideally...

Ahh perfect! I have a couple of spare ESP8266's lying around so I might even see if i can use the GPIO pins directly against the BMS's port. Are you also having the same reliability issues as I have though? I was pushing 150A+ continuous discharge through my 200A BMS (but for like an hour...

I need him to put it into code first so we can test it's actually correct, otherwise it might mislead others in the future, once it's validated, the code (and documentation) is in public github anyway.. this is the github project in question https://github.com/jblance/mpp-solar

@upnorthandpersonal actually - what I found interesting is the code you linked here (https://diysolarforum.com/threads/off-grid-solar-battery-monitoring-and-control-freeware.6662/post-248417) referencing https://github.com/PurpleAlien/jk-bms_grafana/blob/main/data_bms.py vs jblance's version...

Yup c#, originally .net core, now .net5. currently only sending a few fields, like %/Ah remaining, current power (in W's) etc. The raw data is sent to influxDB on localhost (skipping messaging), then HomeAssistant+Grafana on another box does my pretty graphs from the Influx data. Future plans...

I have a feeling there's a totally different protocol involved here.. What I ended up mapping out was the Bluetooth BLE protocol, which looks VERY different to the official RS485 document the supplier have sent me. Ironically i chose to go the BLE route because BLE supports multi-point...

Same. The app without remote control is quite limiting. My battery bank is in a concrete-enclosed garage which means BLE literally doesnt penetrate beyond the door.. so every time i need to check my batteries I need to walk INTO the garage to connect... But i do have a mini bot (jetson nano on...