diy solar

diy solar

Recent content by Pierre

  1. Pierre

    I just direct shorted my brand new 135amp LiFePO4 battery - is it toast?

    If you cannot wake the bms up , cut the casing open with an oscillating saw and I would replace the bms with an external one. JBD will work great and you will have access to it in future via BT / RS232 / CanBus etc. a Lot of these sealed batteries contain very crappy and under rated bms’s. I...
  2. Pierre

    Looking for advice on inverters

    Go Victron - you will thank me later.
  3. Pierre

    Overkill bms useless

    i had to do that on the first JBD’s I bought about 4 years ago. The later ones circa 2023 are much more accurate without recalibration.
  4. Pierre

    Lug holes too big

    Better to source lugs with smaller size holes.
  5. Pierre

    Does JBD bms have auto recovery after LVC?

    You are quoting extremes here. I will not respond further.
  6. Pierre

    Does JBD bms have auto recovery after LVC?

    The scenario is as follows : Normally battery terminal voltage will be around ( 4 x 3,35 ) 13,4v. Should one cell trigger a LVD at 2,8v , the pack voltage is still at 12,85v. Whatever charger you have will respond to this and start charging the pack. Say the LVD reset point is set at 2,9v , the...
  7. Pierre

    Does JBD bms have auto recovery after LVC?

    On the JBD it will only disconnect the load side but will still allow charging. Once the LVD recovery setpoint is reached , the load side will be turned on again.
  8. Pierre

    JBD 4S 200A BMS - heater function?

    I think the contact is automatically turned on when one or more of the temp sensors detect a low temp. Maybe around 0 deg C. I suggest that you put a meter across the terminals ( DC voltage range ) and cool one of the temp sensors down. If no voltage present then switch to resistance measurement...
  9. Pierre

    DON'T Install DC Isolators on Solar

    On a slightly different note : How many of you installed a proper fire extinguisher , rated for Li fires , near your batteries as well as a smoke detector ?
  10. Pierre

    DON'T Install DC Isolators on Solar

    I agree. DC isolator with overload protection. Avoid the unknown brands at all cost. I normally go for Noark , Chint , Hager , Gewiss , Schneider amongst a few other reputable brands.
  11. Pierre

    DON'T Install DC Isolators on Solar

    I have these all over my installation i.e. solar pv feed in , battery feeds to inverters etc. To qualify ‘ unless in a case of emergency ‘ , that is.
  12. Pierre

    Looks like JK BMS are in Hot Water

    The model number is : JBD-AP21S001-L21S-150A-B .
  13. Pierre

    Looks like JK BMS are in Hot Water

    Fully agree. It appears if JBD is not making the 16s contactor based one any longer. I am running one of their latest 150A 16s units with both UART and RS485 sockets ( heating pad output on request ) . Love it !! We are just a small part of their market - you will find JBD in lots of medical...
  14. Pierre

    Bought a van! Now what? 12 or 48 volt?

    Lots of rv builds on the internet using this idea. She has to have a frame made to accommodate the panels so why not just add a slide-out panel at the bottom.
  15. Pierre

    Bought a van! Now what? 12 or 48 volt?

    Lots of good advice on this post. I would suggest starting with as much solar pv as possible. Ever considered a double stack pv array where the bottom section slides out when stationery ? You can use rigid panels for the top tier and flexo panels for the bottom tier. This will make the slide...
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