Lipo battery below 10v

[1 Cup]

So new fridge is in and working well. But the relion battery is now fitted and takeing 15 amps from 200w solar on roof now upgraded wire from 10 amp to 30amp. s/c to battery is 30amp . I've seen 15amps input but the sun has not played well all the time we been away .

Question is. The Relion battery has a BMS , should the battery turn output of

f at 10 volts, ? if so is mine broke. Picture 3

So the first 4 pictures are sunday 3 am.
The rest are from today.

 

[wildebus]

the BMS of a lithium battery would go off at a certain voltage, yes. Do you know the Relions one is set at 10V?

 

[1 Cup]

the BMS of a lithium battery would go off at a certain voltage, yes. Do you know the Relions one is set at 10V?

No I do not know, the Relion lipo. cut off voltages. ! Are they not all the same?
12 v is 12 v with 4 cells.
so 14.2 stop ! charged cut off . 2.5v per cell low cut I0 volts.

Controllers good dave

 

[wildebus]

Assuming you have the RB100 .... https://www.alpha-batteries.co.uk/12v-100ah-relion-lithium-battery/

8V (2.0V per cell) is the cutoff; and 9.2V (2.3V) to reconnect. So your 9.8V still operational is within spec (but there would be very limited energy left though!)

But you are right about 10V being a cutoff for some... the Lithium I have - the Poweroad Infinity - has a BMS discharge cutoff of 10V

 

[1 Cup]

I didn't like it at 9 volts , so should cut off at 8 volts it's all good thanks.
but now wired up I think I'll just leave it alone.

 

[Nabsim]

Would anything still be working that low apart from led’s? I know my fridge cuts out just under 11v (Waeco 110ltr)

 

[wildebus]

Would anything still be working that low apart from led’s? I know my fridge cuts out just under 11v (Waeco 110ltr)

Things like LED lights could still operate.
Some controllers such as the Sargents will cut out at a preset voltage though. I think the Sargent switches from Lesiure to Starter at 10.8V and cuts power entirely at 9V.
I have contemplated fitting some kind of DC-DC controller to provide a set voltage to the habitation electrics to stop the wide voltage fluctuations that the typical camper experiences

 

[SquirrellCook]

I have that in the Betty build with the 12 volt stuff, otherwise the 24 volt can fluctuate.

 

[Admin]

So new fridge is in and working well. But the relion battery is now fitted and takeing 15 amps from 200w solar on roof now upgraded wire from 10 amp to 30amp. s/c to battery is 30amp . I've seen 15amps input but the sun has not played well all the time we been away .

The battery can provide 100Ah, past that point the voltage will drop quickly. This is why you must have a LiFePo4 compatible battery monitor to give you an indication of the state of charge.

 

[1 Cup]

Would anything still be working that low apart from led’s? I know my fridge cuts out just under 11v (Waeco 110ltr)

My fridge alarm started at 12.2 v shown on the victron 100/30. But it was set a 3 bars out of 5 at 3am so put it on (quite mode) 1bar and turned the sound of and went back to bed ! Don't know if it cuts out by its self. It's my frist time away with fridge on 24/7..

 

[1 Cup]

The battery can provide 100Ah, past that point the voltage will drop quickly. This is why you must have a LiFePo4 compatible battery monitor to give you an indication of the state of charge.

Are you saying a smart shunt thingy , as I never thought that safety cut off was needed ! as the relion bms had cut out . Self low volt protection ?..
I have usb flashy lights on all night = would the bms not detect a low voltage draw. Like 4.5 v @ 0.10 volts and cut off at 8 volts ? Phil.
Can bms's see 10 miliamps ?
All my small stuff is 5v usb, some as light strips are upto 3amps phone chargers 800ma the E-fag charger is also low in MA. All charged at night from 6 usb ports.

 

[Nabsim]

I always try to charge things during the day although that’s not always possible. I do have a couple of small power banks I can charge when the sun shines which also helps.
My fridge usually runs 24/7/365 except when it’s being defrosted. If we don’t get sun for a few days though I and I aren’t moving I get my 1Kw genny out. Always charge up when the battery gets to 20%, if not good weather I will keep battery’s between 20% and 80% SoC.

 

[Okta]

There is a procedure for jump starting a Relion battery if the BMS shuts down completely.

“For some issues, such as BMS protection against low voltage, your Relion Battery can be reenergized by applying (jumping) 12 volts to the terminals, much like jump starting a car battery, this can be easily done with jumper cables. If this does not work, it will need to be charged in parallel with another battery that has enough voltage at least 10 volts in a 12 volt battery, this allows the charger to detect a complete circuit. You can use any type of 12 volt battery. Connect your charger directly to a working 12 volt battery. Then, connect your Relion Battery in parallel (positive to positive, negative to negative) to the first battery. The Relion Battery’s BMS will reenergize, bringing the battery back up to its voltage prior to the BMS kicking in. After about 20 minutes, reconnect the charger directly to the Relion Battery, and the charging process will continue normally.”