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16 thoughts on “Bms battery module – can you series connect them?”
  1. Avataaar/Circle Created with python_avatars Andrei Molnar says:

    hi! I want to build a battery bank for an electric motorcycle running at 144-150v and I want to build from this type of battery SPIM08HP 3.7V 16AH Lithium Ion in a 40S 4P configuration, I would need some help on where to find a BMS for Lithium Ion that can handle charging and discharging a series of 40 batteries at 150v up to 100 amps. Is there a BMS that can manage 40 series or do I need more BMS-s connected together in series?

  2. Avataaar/Circle Created with python_avatars Zi Qiang says:

    After 4 years, he I am having played 16s for two years and now wanting to go 4x 16s to reach 192V for summer serious 5kW power to charge my EV. After reading a lot of the expert trying to explain the danger, I can see the point of body diode of the balancing mosfets… the proof was in your video. U started out with 26.27v no load, ie. 13.135v/ea. When the simulated disconnection of one bms, u got 12.03V. 12.03V is the results of taking out 4x Vf of body diodes @0.2763v/ea. This proves that the “off” BMS is bleeding through but luckily the inverter did the needed UVP that prevented high current flow to melt the body diode. This is discharging. During charging, I’m not sure, without actually having looked at a circuit diagram before, if the body diode will be reverse biased, and I suspect the mosfets are in series and so each mosfets will only see its own Vds drive from 13.135V/4…and this would still be safe?

  3. Avataaar/Circle Created with python_avatars ahmad barq says:

    Hello
    If i made 4 12 volts batteries in series with 4 bms’s Can i charge them with a 48v charger ❤

  4. Avataaar/Circle Created with python_avatars Sree Kumar says:

    072723/1028h PST 🇺🇸 Thank you for the demo on 2X12V LiFePo4 BMS controlled Batteries in series; to load (discharge) Most DIY enthusiasts do not demo this. One prominent battery manufacturer (BB) also did not speak or demo this, as explicitly as you did. Best wishes.

  5. Avataaar/Circle Created with python_avatars KG Salvage says:

    All the 12v lithium batteries that you can can purchase have a BMS in them. They allow a least 4 in series for a 48v system. The BMSs in all of the batteries are basically the same circuitry. Connecting batteries in series is just a basic voltage divider. You only ever see the individual voltage across each.

    As long as each battery is the same capacity it should be fine. Each one needs to be at the same state of charge when connected. Then the same amount of current flows through each battery.

    As long as you do not run the bank too low , neither should cut out. Also I would only run the current at about half the rating of the BMS, then you will never go into overcurrent cutoff. I never use a BMS at more than 70 -80% of its rated current. If so only for a brief period.

    I'm not sure why there was 12v showing with one of the BMSs off. The mosfets should have been switched off.

  6. Avataaar/Circle Created with python_avatars rawbasic rawbasic says:

    Good morning can you tell me what is the name of the volt meter you’re using please thanks

  7. Avataaar/Circle Created with python_avatars Joe Villeneuve says:

    Thanks !! I applied You're setup to a 16s 100ah 48v battery with two JBD 24v 100A bms.
    I'm getting ready to put I to work.
    Do you have any advise for something to look for before to use it in a home system ?

  8. Avataaar/Circle Created with python_avatars rob rey says:

    do you think this will work with two daly 15s bms? I have them set up for charge only. But when I connected the series connection I heard a high pitch beeping sound, it was very quiet but it made me nervous. I couldn't find a proper 30s DMs so I decided to try to cheap low current 15s bms.
    I appreciate the informative content thank you sir.

  9. Avataaar/Circle Created with python_avatars pitchinwedge says:

    The fan was pulling 2.9A @ 26V. When wired in series as in the video, does each BMS also deliver half the current?
    Meaning, each BMS is providing 1.45A @ 13V? Or do both BMS provide 2.9A @ 13V?
    Hope someone can clarify. Cheers.

  10. Avataaar/Circle Created with python_avatars Lolo Lolo says:

    Salut mec es possible de brancher des BMs en série pour avoir 250v cc en 18650 pour une batterie supplémentaire dans une Prius ? Merci a toi et jolie tout tes videos

  11. Avataaar/Circle Created with python_avatars Patrick (methods) Schindler says:

    You an N O T stack 4S BMS's into 8S or 16S unless they specifically state that you can. This is driven by the voltage of the components populated. I especially would not try it with that DALY which will fail-short on you, leaving you unprotected. This happens when they populate super-low quality output control mosfets. To save money they probably (definitely) use lower voltage mosfets for the 4S circuits. The higher your mosfet voltage the higher your RDSON or Price goes… sigh. Whatever. Do as you please.

  12. Avataaar/Circle Created with python_avatars david dada says:

    Hi can i put two bms in one 36v battery ….the bosch one for discharging and the other one just for charging. Thanks .
    I dont have bosch charger….and its not charging with normal charger.

  13. Avataaar/Circle Created with python_avatars Ramshankar Majhi says:

    I have Four 3.7V 1800mAh li battery packs. If I wire the four 1800mah cell in parallel to make a 7200mAh cell..which type of BMS i need?Order Link

  14. Avataaar/Circle Created with python_avatars Andrisoa Harry Clerc Randrianjafiniarivo says:

    Thanks, dude, it's clear.

  15. Avataaar/Circle Created with python_avatars PENG28 says:

    please try to charge it back … doest it work ? thanks you.

  16. Avataaar/Circle Created with python_avatars Mr Alexander DIY says:

    What about charging

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