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  1. K

    One cell charging faster, triggers voltage difference disconnect

    Hello, looking for help with my 4s lishen 280ah battery pack with daly smart bms. Sometimes, but not always, when I'm charging the battery at 20ah I notice the charging gets into a loop of ramping up the amperage then disconnecting. It appears the "cell voltage difference disconnect" is...
  2. K

    Charging issues

    I had done one when I first got the cells. this time I just charged up the "out" cell.
  3. K

    Charging issues

    Thanks everyone for the advice! I singled out the low voltage cell and charge it up to match. its much more balanced now and the pack is resting at 14v when fully charged. I checked all the connections were tight. I also lowered my charging profile from 30amp to 20 amp which is a bit...
  4. K

    Charging issues

    wonder why it fell out of balance? i'm not doing anything weird with them. Maybe the daly is pulling its power from one battery?
  5. K

    Charging issues

    good point on the individual balancing.
  6. K

    Charging issues

    Hello, I'm hoping this is the right area to post this. Ive been having trouble with charging my 280ah 4s battery pack. I have a Daly 200ah smartBMS and a kisae dmt1250 charger. using the DC charge setting and wired to my vehicle's alternator, the charger ramps up amperage then cuts off to zero...
  7. K

    Battery build picture thread

    its a "C" configuration with the B+ and B- at the one end nearest the BMS. it was easiest to have the B- terminal on top so the BMS lead doesnt cross over the B+ terminal. Using spacers between the batteries required longer busbars than the stock ones provided. I made some using 6AWG battery...
  8. K

    Daly (?) 200a 12v 4s Smart BMS (with Bluetooth) from Ali...

    yea, I've ordered a Juntek shunt meter but kind of a bummer the app's SOC doesnt work. Glad I'm not the only one having this issue though.
  9. K

    Daly (?) 200a 12v 4s Smart BMS (with Bluetooth) from Ali...

    is that SOC accurate John? mine shows 70% at fully charged still.
  10. K

    Battery build picture thread

    I should do a teardown, its much cleaner now. well its 4*272ah batteries, a Kisae Abso 50a charger, 200a smart BMS, dual temp controller some output USB's and XT60's, all crammed into a plano ammo case. The most unique part of the build is the temp controller, which has 2 temp probes and...
  11. K

    Daly (?) 200a 12v 4s Smart BMS (with Bluetooth) from Ali...

    those two pins are there for this reason. when you get the BT turned on and can see the settings through the app, you'll get a bit more confidence in the BMS.
  12. K

    Battery build picture thread

    Mines a lot smaller than all yours haha
  13. K

    Daly (?) 200a 12v 4s Smart BMS (with Bluetooth) from Ali...

    I had never heard that my battery needed to be fully charged to activate my bms... so I just went ahead and hooked everything up (series) to do my first charge, then disassembled to put in parallel with 3.6v charger to top balance, then re-assembled in series for final install. again, not an...
  14. K

    Daly (?) 200a 12v 4s Smart BMS (with Bluetooth) from Ali...

    I get the trepidation. Theres no indicator light, probably to reduce standby current. the UART port is right for the BT adapter. You should follow the procedure in the manual for connecting everything. I'm no expert, my first BMS as well, but here is what I did: Batteries should be charged up...
  15. K

    Daly (?) 200a 12v 4s Smart BMS (with Bluetooth) from Ali...

    mine's the same, they say its a daly chip/board just unbranded. the limited Daly manual applies. your supplier should be able to send you the manuals or google "daly smart bms manual"
  16. K

    Disable "sleep mode" on Daly BMS via UART and Sinowealth?

    What issue were you getting before changing the sleep timer? my Smart BMS app will show my 4s battery correctly for a while then show like 30 batteries and 17 temp sensors and 26volts out of the blue. Can only "fix" it by disconnecting B- from the battery.
  17. K

    Daly smart BMS

    yea I can short the B- and P- with a lead to get the BMS to turn on (for example when I have to disconnect the B- to reset the BT and then need to turn the BMS back on). When the BT is showing incorrect information, its still outputting the battery voltage so I dont think its tripped a...
  18. K

    Daly smart BMS

    I'm getting pretty frustrated with the BT, it has happened 4 times to me. The only way I know how to reset is to disconnect the B- from the battery and touch it to the P-. This is very difficult now that I"ve installed the batteries in a box. Completely kills the convenience of bluetooth. Glad...
  19. K

    Daly smart BMS

    I have the Daly Smart BMS 4s 12v 200a discharge. The bluetooth app was showing the right info for a while then started showing really incorrect info, like 8 temp sensors and 18 batteries. I tried closing the app, disconnecting BT on my phone, disconnecting the BT dongle, shorting the KEY pins...
  20. K

    BMS won't turn on

    I could use a momentary switch yea. once shorted for a sec, the BMS turned on and stayed on. now to figure out this charger!
  21. K

    BMS won't turn on

    Ok I figured it out... man they did not make this easy though. I found this post and it made me go look at the documentation again about all the pinouts. Found a mention of a KEY SWITCH but it NEVER SAID in the setup instructions that I'd need to short these 2 pins to turn on the BMS. well its...
  22. K

    Alternator sizing

    Hey, my vehicle has a 90amp alternator. I'm building a large lithium battery with a 50amp DC-DC charger. Will this damage an alternator to output 50amps for possibly 4-5 hours on a long trip and a discharged battery to fill up?
  23. K

    BMS won't turn on

    Hey I disco'd the charger and reset the bms. I'm seeing 9v from the battery Pos to the BMS's P-, but 13.19v across the battery. why would there be a voltage difference? I've given it a few minutes to startup and yes theres a BT dongle. Should the BT dongle be connected at startup or not? I...
  24. K

    BMS won't turn on

    Hey everyone I need some help. I just got my 280ah cells with a 200a Daly Smart BMS Common port. I gone over my wiring a dozen times but the BMS won't kick on. I tried the "reset" by touching the P- to the B- on the BMS (while B- is still attached to the battery) and the charger kicks on but as...
  25. K

    smart BMS vs smart charger

    Hello, I'm building my first battery pack, thinking of going with a 4s config of the 280ah shensen basen packs. its going to be used in an RV as the Aux battery. Next I'm looking for a good BMS and considering a Daly just because it seems popular. open to suggestions. my question is about...
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