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  • Post in thread: Heltec (JK) 200A Smart BMS with 2A Active Balance

    Hello. Update. TLDR: 1) BMS is faulty 2) Precharging resistor works BMS. Clearly a defect: If I turn off charging and discharging the board gets hot really quickly: I've found at least one dead MOSFET. Its gate is short circuited to the Source. There may be more (up to 8) around it, but...
  • Post in thread: Heltec (JK) 200A Smart BMS with 2A Active Balance

    Then why does it try to start? choose a 1w - it's smaller and could be integrated directly into push button housing. 0.25 - divide battery voltage by this value and decide whether such potential inrush current is OK for your system.
  • Post in thread: Heltec (JK) 200A Smart BMS with 2A Active Balance

    Hello! Finalizing my repair story. My previous posts: https://diysolarforum.com/threads/heltec-jk-200a-smart-bms-with-2a-active-balance.17831/page-21#post-407457 https://diysolarforum.com/threads/heltec-jk-200a-smart-bms-with-2a-active-balance.17831/page-21#post-408008...
  • Post in thread: Heltec (JK) 200A Smart BMS with 2A Active Balance

    @curiouscarbon Ideally yes - this is how it should be. But I have to use what I have. I know that bms can act as a solid state switch (for cell undervoltage protection it worked well). The only problem is that I don't know how to control it manually. Anyway thanks for your suggestion.
  • Post in thread: I have a Brand new pair of Growatt 3kw offgrid inverters SPF-3000TL-LVN 48v 120-240v split phase inverters

    Sorry for offtop but what setup have you chosen?
  • Post in thread: Heltec (JK) 200A Smart BMS with 2A Active Balance

    No, it does not. It restarts automatically. Hardware version 6.x
  • Post in thread: Heltec (JK) 200A Smart BMS with 2A Active Balance

    @GXMnow "Balance lead fail" was a test condition to see how BMS operates under it. It would be good if BMS just contuniue stay OFF in fault state until further manual restart. What do you think, @Nami ? "would pop those fuses first" What type of fuses do you use? As you can see from my...
  • Post in thread: 280Ah battery case

    Hello! Any updates? What was measured (or at least observed:) ) capacity? Can you suggest this product?
  • Post in thread: Heltec BMS' (up to 350A) with Active Balancing & Independent Active Balancers

    What's about phone app, how good it is? Ali feedbacks say it has bugs and many parameters can't be changed.
  • Post in thread: Heltec BMS' (up to 350A) with Active Balancing & Independent Active Balancers

    fafrd, could you please say what exactly got burnt on your defective BMS? Maybe make some pictures. What mosfets are used, etc.? Sorry, if you'd already answered this.
  • Post in thread: Heltec (JK) 200A Smart BMS with 2A Active Balance

    Hello everyone! Need your advice. Main issue I'm trying to solve is the spark in the switch when connecting battery to the inverter. It literally melts/welds metal parts inside. I'm using fuse holder as a switch between battery and inverter: I know some one uses resistors to precharge...
  • Post in thread: Heltec BMS' (up to 350A) with Active Balancing & Independent Active Balancers

    Hello! What is the latest version of Android application? I have "heltec-bms-2.6.0.build30.apk" and "jkbms-3.1.0.58.apk". Just wonder which is better?
  • Post in thread: Heltec (JK) 200A Smart BMS with 2A Active Balance

    @Sanwizard @upnorthandpersonal Thanks for your replies. Resistors work, yes... but how can I explain to some one why would they need to have two switches and special order for them? It sounds a bit amateur-ish... Are there industrial solutions to make such precharge as a part of single...
  • Post in thread: Heltec (JK) 200A Smart BMS with 2A Active Balance

    Hello! Reading the manual from the GXMnow's link above it says: " Discharge ... when it displays "off", it means the current protection board discharge MOS is off and the battery is not allowed to discharge." So can I ask you guys to try this option in your bms? Because as I mentioned earlier...
  • Post in thread: New 2A Active Balancer with BMS Function won`t run

    Hello! Any updates? Did they refund you or maybe BMS got back to life?
  • Post in thread: Heltec BMS' (up to 350A) with Active Balancing & Independent Active Balancers

    fafrd, thanks for reply. Unfortunately without knowing the root cause of your incident it's really hard to tell whether it was soldering issue of your particular board or it is design flaw itself. Maybe they are using cheap mosfets with high Rdson and overheating over long period of time is...
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