Am I overcharging my batteries

Cloudsbegone · Jul 5, 2020

I have 2 VaIence Lithium batteries and I just bought a Progressive Dynamics PD9160ALV 12V Lithium Ion battery converter/charger - 60 Amp. Charged the batteries for 2 days and the voltage is showing 14.6. I’m afraid I’m over charging the batteries, am I wrong.

Ampster · Jul 5, 2020

I wouldn't charge mine to 3.6 but others do that regularly. Take your pick but presumably Valence has you covered?

mymorph · Jul 5, 2020

the recommended charge rate for the valence 40ah battery is 20amp.

John Frum · Jul 5, 2020

mymorph said:
the recommended charge rate for the valence 40ah battery is 20amp.

Actually that is typically the max charge rate.
The recomended charge rate is usually .2c or 8 amps.
Your batteries will be hollering out their safe word at 60 amps.

Ampster · Jul 5, 2020

mymorph said:
the recommended charge rate for the valence 40ah battery is 20amp.

@smoothJoey beat me to it.
In that case he needs to crank down the charging Amps.

mymorph · Jul 5, 2020

smoothJoey said:
Actually that is typically the max charge rate.
The recomended charge rate is usually .2c or 8 amps.
Your batteries will be hollering out their safe word at 60 amps.

my charger is 8 amps , so im glad you said that.

would the BMS limit the charge rate?

John Frum · Jul 5, 2020

It seems @Cloudsbegone has 2 in parallel so the typical recommended charge rate would be 16 amps.
Check the doco for your specific battery.

mymorph · Jul 5, 2020

might be this 1?

http://mesa-tec.com/wp-content/uploads/2014/05/Mesa_Valence_U_Charge_U1-12RT.pdf

Ampster · Jul 5, 2020

mymorph said:
would the BMS limit the charge rate?

Only as a last resort as a backstop to cut off charging altogether. The primary setting should be in your charger or charge controller.

Gazoo · Jul 5, 2020

Cloudsbegone said:
I have 2 VaIence Lithium batteries and I just bought a Progressive Dynamics PD9160ALV 12V Lithium Ion battery converter/charger - 60 Amp. Charged the batteries for 2 days and the voltage is showing 14.6. I’m afraid I’m over charging the batteries, am I wrong.

I believe you have a pair of Valence U27-12XP correct? The charger should cut off at 14.6 volts. Then the batteries will drop quickly to their nominal voltage.

Cloudsbegone · Jul 6, 2020

I bought the Progressive Dynamics charger because it is suppose to be one of the best for lithium batteries. The Valence batteries are the U27-XP they do not have a bms.

Gazoo said:
I believe you have a pair of Valence U27-12XP correct? The charger should cut off at 14.6 volts. Then the batteries will drop quickly to their nominal voltage.

correct, thank you. I know they say that the progressive charger charges to 14.6 but I don’t have a monitor yet to see if it cuts back on charging.

Cloudsbegone · Jul 6, 2020

mymorph said:
the recommended charge rate for the valence 40ah battery is 20amp.

I have 2 Valence U27-XP rated at 138 Ah each. Also the progressive charger is designed for Lithium, the 60 amp is maximum output.

Cloudsbegone · Jul 6, 2020

mymorph said:
might be this 1?

http://mesa-tec.com/wp-content/uploads/2014/05/Mesa_Valence_U_Charge_U1-12RT.pdf

U27-XP 138 ah

Gazoo · Jul 6, 2020

Cloudsbegone said:
The Valence batteries are the U27-XP they do not have a bms.

Well actually they do. But I have read conflicting reports on whether or not the internal BMS will work without plugging in the external BMS.

Cloudsbegone · Jul 6, 2020

I understand they have a internal cell balancer, but not a undercharge or overcharge or temp protection.

Am I overcharging my batteries

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