Problem with BMS for 48v off grid system

Am i right you have 4 BMS for 4 cells each, in series?
If yes, that wont work, ever. You Need a correct 32 s BMS.

And damaging the Batterie.... That is hardly possible. The Other way round, damaging a 4s BMS, it is easy, and possibly did happen already.

Am i right you have 4 BMS for 4 cells each, in series?
If yes, that wont work, ever. You Need a correct 32 s BMS.

And damaging the Batterie.... That is hardly possible. The Other way round, damaging a 4s BMS, it is easy, and possibly did happen already.

Thank you for your message.
Yes I have 4 x 12 volt batteries in series producing 48+ volts (each battery one is connected to an individual BMS from the negative terminal). There is also an active battery equalizer.

Grateful if you could explain what and why I am doing incorrectly and how to fix the problem.
best

Thanks again.
This is the setup:

1 Growatt 5000ES which has a 100A charge controller (5.5kw) 

16 x 3.2 c Lifepo 280 AH batteries grouped into 4 individual batteries - each with a Daly 4S 12v 250A BMS - connected in series to produce 52+/1 volts

I top balanced the batteries first.

The Growatt charger/controller only works with 50 volts +/-

Because of an error (incorrect top balance?) the last battery is causing its BMS to fail.

The first three batteries produce +/-39 volts in series.
But the last battery+bms is tripping the BMS.

However by bypassing the last BMS I am able to produce the required 52 volts to start the Growatt charge controller.

Great if members could guide me further as I obviously do not wish to damage the equipment and urgently need a working system.

Thanks

No Other Chance but buying A New 16 s BMS, and wiring it to the cells.

Connecting 4s BMS in serial fails, when one BMS wants to Switch Off, and geht's the füll 48V ( max 58 V) to Cut Off by the Mosfets.
Probably your one BMS broke by such a case.
You can hardly do anything to safely run your system at moment.

What you can do is, Connect all your batterys in serial, but let the working BMS connected.
Use the free Output of each BMS to Trigger a small 12 V relay. Connect the three relay contacts to trigger a big load relay, or at least some warning Lights. But still the one bank with the bad BMS will stay unprotected.
You should really be sure that your top balancing ist perfect, and the load provides undervoltage protection very early, otherwise your cells are at risk.

No Other Chance but buying A New 16 s BMS, and wiring it to the cells.

Connecting 4s BMS in serial fails, when one BMS wants to Switch Off, and geht's the füll 48V ( max 58 V) to Cut Off by the Mosfets.
Probably your one BMS broke by such a case.
You can hardly do anything to safely run your system at moment.

What you can do is, Connect all your batterys in serial, but let the working BMS connected.
Use the free Output of each BMS to Trigger a small 12 V relay. Connect the three relay contacts to trigger a big load relay, or at least some warning Lights. But still the one bank with the bad BMS will stay unprotected.
You should really be sure that your top balancing ist perfect, and the load provides undervoltage protection very early, otherwise your cells are at risk.

Thank you for your very clear and helpful explanation.
As you recommend I will now immediately buy a new 16S BMS rated for 48V.
Should it be rated 250 AH or better to be higher? My cell are rated 280AH.
Thanks again.

You specify the current for the max (load or Charge) current ( in Amps) (with a plus for spare and safety), not for the capacity (Amp hours).
Example, for max load current of 80 A use a 100 A BMS.

Do Not go too cautious, example for a 50 A load Use a 250 A BMS, because the current messurent geht's less accurate in higher current BMS. And its more expensive as well.

Thanks for your advice. Very helpful.