Battery overvolt issue help

[Shadowhawk]

I have a 24V system 2s3P 100ah 12v lifp04, I have been having 2 battery that go into a cell overvolt and then it throws a pack overvolt. what would be possible causes for a cell overvolt other than manufacturer defect? Could I be sending too many amps and it overvolt the batteriers? I have a 1200w array on a renogy 40a and a1560w array on a powmr aio hybrid feeding the 24v bank.
When I was running 2p2s I didn't have this failure with summer sunshine
I am going to charge to full and balance the batteries again in parallel even though right now their volts appear to be the same across all 6 batteries.
Any help will be appreciated.

 

[kommando]

Most likely you have a runner cell or cells in those 2 batteries, so charge them up to the balancing voltage and hold them there until the top V cells drop and match the others, then you can go to a full charge whilst still balancing.

 

[Shadowhawk]

Most likely you have a runner cell or cells in those 2 batteries, so charge them up to the balancing voltage and hold them there until the top V cells drop and match the others, then you can go to a full charge whilst still balancing.

(the BMS balancer start voltage is set at 3400 with delta to balance at 10 )
So I want to charge to say 13.8V and hold them until they all equalize then send them to full?
Just so I grasp what you are saying in my own terms

 

[kommando]

(the BMS balancer start voltage is set at 3400 with delta to balance at 10 )
So I want to charge to say 13.8V and hold them until they all equalize then send them to full?
Just so I grasp what you are saying in my own terms

Yes, if you do not hold at the balance V then it will not have enough time to get the cells fully balanced.

 

[Glock24]

With your combined arrays you're feeding around 38A to each battery, which does not seem excessive. Checknwhat the spec sheet for the batteries says.

Also check with a multimeter the voltage when you get the overvoltage error and also compare the voltage reading for each charge controller. They might not be the same and one might be trying to charge at a higher voltage.

 

[mikefitz]

Any help will be appreciated

Battery balancer,

Battery Balancer - Victron Energy

Equalize the state of charge of two series connected 12V batteries using the Battery Balancer. Find a Victron Energy dealer near you.

www.victronenergy.com

Or ,

HA01 HA02 HC01 HC02 Battery Equalizer Balancer For 24V 48V Lead-acid Batteris | eBay

The battery equalizer can compensate for the battery in both directions. 1 x Battery Equalizer. Standby Current: < 3mA. Australia,Canada,Netherlands. Switzerland,Spain,France. United States. United Kingdom.

www.ebay.com

You may have a charge voltage too high for the 24 volt system. Reduce to just below cell overvolts level and hold the pack at this voltage for some time, say 24 hours. Normal charge volts need not be more than 28 to 28.4 volts, float at 27 volts
Idealy all 12v batteries , or 12v parallel groups need charging seperatly before connecting in series .
Off the shelf batteries almost always have cell inbalance, you just need time for the cell balancing to sort things out.

 

[Shadowhawk]

Battery balancer,

Battery Balancer - Victron Energy

Equalize the state of charge of two series connected 12V batteries using the Battery Balancer. Find a Victron Energy dealer near you.

www.victronenergy.com

Or ,

HA01 HA02 HC01 HC02 Battery Equalizer Balancer For 24V 48V Lead-acid Batteris | eBay

The battery equalizer can compensate for the battery in both directions. 1 x Battery Equalizer. Standby Current: < 3mA. Australia,Canada,Netherlands. Switzerland,Spain,France. United States. United Kingdom.

www.ebay.com

You may have a charge voltage too high for the 24 volt system. Reduce to just below cell overvolts level and hold the pack at this voltage for some time, say 24 hours. Normal charge volts need not be more than 28 to 28.4 volts, float at 27 volts
Idealy all 12v batteries , or 12v parallel groups need charging seperatly before connecting in series .
Off the shelf batteries almost always have cell inbalance, you just need time for the cell balancing to sort things out.

I have a single ecoworthy 24v balancer I was hooking to the 1st battery in each parallel set.