LIFEPO4 battery balancing

jayjim

jayjim

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I am connecting 2 x lifepo4 12v x 108ah
batteries in series .They are in different state of charge, Will they balance out over time, with no damaging effect or is it emperative that they be at the same state of charge, ie balanced. Can anybody shine some light on the subject. thanks
 
Use this, it works
I have one
www.geewiz.co.za

Lithium 24V Battery Balancer / Equaliser with BLUETOOTH (suitable for all battery types) - 24V (2x 12V Batteries)

Can be connected to 24V battery banks (2x 12V in series) Monitors each battery voltage On deviation of more than 20 mV, the higher voltage battery will be discharged to the lower voltage batteries until all the battery voltages are equal Battery banks of 2x 12V can be used IP67 rated No external...
www.geewiz.co.za www.geewiz.co.za
@bwana please close this room
Thank You
 
Pineapple Smurf said:
Use this, it works
I have one
www.geewiz.co.za

Lithium 24V Battery Balancer / Equaliser with BLUETOOTH (suitable for all battery types) - 24V (2x 12V Batteries)

Can be connected to 24V battery banks (2x 12V in series) Monitors each battery voltage On deviation of more than 20 mV, the higher voltage battery will be discharged to the lower voltage batteries until all the battery voltages are equal Battery banks of 2x 12V can be used IP67 rated No external...
www.geewiz.co.za www.geewiz.co.za
@bwana please close this room
Thank You
Click to expand...
thanks i will get one .but i need to connect asap.
 
jayjim said:
I am connecting 2 x lifepo4 12v x 108ah
batteries in series .They are in different state of charge, Will they balance out over time, with no damaging effect or is it emperative that they be at the same state of charge, ie balanced. Can anybody shine some light on the subject. thanks
Click to expand...
Yes, it’s imperative that they are the same SOC before connecting in series. They will never balance when in series. You need a balancer for that.

Connect them in parallel and charge with 12V charger then connect in series.
 
Does anyone know of a shop in Montague gardens or surrounds or Paarl area that sells lifepo4 12v chargers or lifepo4 24v balancers. Thanks
 
wingnut771 said:
Yes, it’s imperative that they are the same SOC before connecting in series. They will never balance when in series. You need a balancer for that.

Connect them in parallel and charge with 12V c
Click to expand...
 
What must charger output voltage be (measured over batt terminals)
 
wingnut771 said:
Can you be more specific?
Click to expand...
12v charges normally charge at 12v to 13v. lifepo4 battery wants 14.2v to 14.4v. i cannot find any charger that charges at that voltage.So if you say use a 12v charger , can it be any old charger or one that charges at 14.2volts.( will a normal 13v output charger charge a lifepo4 12.8v battery)
 
jayjim said:
12v charges normally charge at 12v to 13v. lifepo4 battery wants 14.2v to 14.4v. i cannot find any charger that charges at that voltage.So if you say use a 12v charger , can it be any old charger or one that charges at 14.2volts.( will a normal 13v output charger charge a lifepo4 12.8v battery)
Click to expand...
a normal LA charger should have a voltage of 13.8V or more which is fine for the LFP (up to 14.6V max).

For example: the mecer trolley inverter's charger bulk charges to 14.6V then floats at 13.8V.

Do you have any 12V chargers, like maybe something you use for your car?
 
jayjim said:
12v charges normally charge at 12v to 13v. lifepo4 battery wants 14.2v to 14.4v. i cannot find any charger that charges at that voltage.So if you say use a 12v charger , can it be any old charger or one that charges at 14.2volts.( will a normal 13v output charger charge a lifepo4 12.8v battery)
Click to expand...

Not true, My El cheap from Takealot does 14.8V in bulk mode.

1675080267303.png

I would not come close to LFP with it cause of Pulse charging.
 
AlphaJohn said:
Not true, My El cheap from Takealot does 14.8V in bulk mode.

View attachment 1466329

I would not come close to LFP with it cause of Pulse charging.
Click to expand...
In fairness, the pulse charging isn't all the time I don't think, but rather one of the stages so could still use it possibly. I would just monitor the volts and stop at 14.6V as that's when both batteries will be 100% SOC.
 
In the absence of a charger and balancer, can i discharge the fuller battery (with 2 x 12v car headlight globes)till near where the empty one is .then charge in series with 24v inverter.(until balancer is obtained )
 
jayjim said:
In the absence of a charger and balancer, can i discharge the fuller battery (with 2 x 12v car headlight globes)till near where the empty one is .then charge in series with 24v inverter.(until balancer is obtained )
Click to expand...
I would just connect them in series and monitor them with a multimeter while they're charging. Maybe you hit a luck and they are balanced. Nothing will explode or anything. If one peaks before the other then you can either set the voltage to the lower value on the inverter or do the light bulb thing on the high battery.

The objective is to get in into the part of the curve where its not flat (above 14V)
1675090233375.png
 
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