diy solar

diy solar

Lipo4 cells discharged to 1.5 volts, are they toast?

C

Checkthisout

Solar Wizard
Joined
Nov 14, 2021
Messages
5,063
Asking this twice since it will maybe get attention here.

The short. My cells discharged to 1.5 volts overnight. Generator failed. BMS failed to stop allowing discharge.

Can these cells be recovered? I can make an emergency trip today, maybe with a suitcase generator otherwise not until Friday or does it even matter?
 
Checkthisout said:
Lipo4 cells discharged to 1.5 volts, are they toast?
Click to expand...

LiPo or LiFePO4? Not sure about LiPo but others threads on here discussed recovering LFP batteries carefully / successfully - see link I posted below.

Not good the BMS failed, though - do you know why?
 
here's the link I remembered..

diysolarforum.com

Has anyone ever been successful bringing a low cell back to life?

Have a 1st gen Jakiper 48v 100aH server rack battery. Never cycled the battery. I believe it was racieved at 50% charge. Now after some time the inverter is hooked up and ready to go now it shows a low cell UVP. It's in the ~300mV range. Asked the manufacturer for a replacement cell, but they...
diysolarforum.com diysolarforum.com
 
SeaGal said:
LiPo or LiFePO4? Not sure about LiPo but others threads on here discussed recovering LFP batteries carefully / successfully - see link I posted below.

Not good the BMS failed, though - do you know why?
Click to expand...

It's a Daly.
 
Just saw your other thread - looks like 1.1V :( Hopefully others with more experience can add to the link I posted above.

Just a secondary thought (for when you hopefully get it back up again)... even though the BMS failed, did the inverter not also have a low pack voltage cut off?
 
SeaGal said:
Just saw your other thread - looks like 1.1V :( Hopefully others with more experience can add to the link I posted above.

Just a secondary thought (for when you hopefully get it back up again)... even though the BMS failed, did the inverter not also have a low pack voltage cut off?
Click to expand...

There is a constant 1.8 amp ~(45 watt) draw for a POE switch that runs a cellular modem, cameras, amplifier, PC, echo dot and generator start device.

Security system for the place.

Notice the amps in reading on the BMS. Got a 20 chain e-mail going back and forth with Daly. Anytime one of the MOS shots off, the amps jump to 70.

The distance away from refine makes refinement and repairs difficult.
 
Last edited:
If you go there, you may need to "jump" the BMS with a charging voltage start charging.

For me, this involves bypassing the BMS with a power supply. If I did this with the AC to DC converter, usually won't work since that DC is routed through the BMS shut off. Same BMS will occasionally allow it.

EDIT: I have a smaller Dally that the settings are not adjustable. I think the low voltage cutoff is set for 2.25 per cell, and I can't change that. I've twice recovered it from a tripped BMSS for low cell voltage, and three times for over current.
 
You must log in or register to reply here.

Similar threads

C
Daly BMS let cell voltage drop to 1.5 Volts, are the cells now toast?
2
Replies
39
Views
2K
Checkthisout
C

diy solar

diy solar
Back
Top