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    ENJ Power for Heltec/JK BMS

    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...
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    ENJ Power for Heltec/JK BMS

    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...
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    ENJ Power for Heltec/JK BMS

    so, without the CANbus chip, are those 3 wires just normal TTL serial signal then?
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    ENJ Power for Heltec/JK BMS

    Hmm I must've got a very strange version then? 3 pins on the CAN/RS485 port. measures exactly 3mm apart (so 1mm pitch), and it's a JST GH style socket which is typically only available in 1.25mm pitch. I agree with @Steve_S here - would you guys be able to provide some "pigtails" for these...
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    ENJ Power for Heltec/JK BMS

    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...
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    ENJ Power for Heltec/JK BMS

    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...
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    ENJ Power for Heltec/JK BMS

    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...
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    ENJ Power for Heltec/JK BMS

    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...
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    ENJ Power for Heltec/JK BMS

    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...
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    Daly 8s 24V 200A LiFePo4 Smart BMS

    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...
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    ENJ Power for Heltec/JK BMS

    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...
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    Daly 8s 24V 200A LiFePo4 Smart BMS

    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...
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    Not really BMS, but need a wireless 12V voltage/current monitoring solution

    Hmm the victron is a bit pricy for my needs.. considering a JKBMS which does all of that and is a full BMS is only around $200 shipped. I was hoping for something much less considering i only need it to perform monitoring functions and can even be contactless as I don't need absolute precision...
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    Not really BMS, but need a wireless 12V voltage/current monitoring solution

    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...
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    Daly 8s 24V 200A LiFePo4 Smart BMS

    Yup I had another question out in another thread somewhere asking whether it's possible to run a separate active balancer on top of the JKBMS's built-in balancer and whether it'd cause problems... and it seems like the prevailing answer is it'll be fine (even the JKBMS seller said the same thing...
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    Heltec (JK) 200A Smart BMS with 2A Active Balance

    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...
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    One active balancer for two parallel banks

    Not all of them, can't assume that. Mine has an active balancer and even tells you the exact balancing current, and which cell it's taking power from and which cell is being topped up. Yup I know.. oh sorry I should've mentioned the numbers I gave above was just to illustrate an example. That...
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    One active balancer for two parallel banks

    I've got a more basic question actually... Is it even possible to run a BMS (that has onboard active balancing) AS WELL as an Active Balancer, on the same bank?... At first glance this seems to be straightforward but on second thoughts, think about this example bank average voltage is 3.4 Cell...
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    Heltec active balancer, factory direct, no branding, cheaper!!!!

    man that's a deal-breaker right there :( ... on LiFePo4 chemistry that's like almost 50% SoC difference before you'll see a 0.1v difference! on my JK BMS I set the delta threshold to be 0.01V... I'd be interested in this if they have a version that triggers on 0.01 or less... because on a larger...
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    ENJ Power for Heltec/JK BMS

    Hmm doesn't look to be the case, in my case it's literally the combined BMS unit with balancer onboard.. The commands I captured over BLE are for the balancer as well as BMS, they share the same request and corresponding response headers for BMS and balancer functions, that seems to be...
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    ENJ Power for Heltec/JK BMS

    @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...
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    ENJ Power for Heltec/JK BMS

    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
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    ENJ Power for Heltec/JK BMS

    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.
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    ENJ Power for Heltec/JK BMS

    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...
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    ENJ Power for Heltec/JK BMS

    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...
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    ENJ Power for Heltec/JK BMS

    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...
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    ENJ Power for Heltec/JK BMS

    @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...
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    Heltec (JK) 200A Smart BMS with 2A Active Balance

    LOL this happened to my 12V when i tried to jumpstart my BMS... big bright spark, life flashed before my eyes and I thought i had died hahaha (is it just me or does the thought of working with LFP banks that can dump >30kW's of current instantaneously scare the crap outta other people too?)...
  29. L

    Heltec (JK) 200A Smart BMS with 2A Active Balance

    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...
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    ENJ Power for Heltec/JK BMS

    @DIY-Dan did the rs485 box come with any PC software? Or are you planning to run jblance library for comms?
  31. L

    Heltec (JK) 200A Smart BMS with 2A Active Balance

    hmm this is something i need to consider actually.. there is an advanced parameter for power-off voltage. I would assume one of your cells hit that limit and the BMS shut down to protect the cells (otherwise the BMS itself becomes a parasitic drain).. It's a good protection feature but I've...
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    Overkill 24v Under Voltage issue

    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...
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    Does it make sense to have my BMS only connected to my battery

    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...
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    Overkill 24v Under Voltage issue

    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...
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    Overkill 24v Under Voltage issue

    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...
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