question

99sport avatar image
99sport asked

Charging rate for low State Of Charge LiFePO4 batteries?

Do highly discharged LiFePO4 batteries need to be charged slowly? The Victron Buck-Boost configuration (TSConfig) has a setting to limit charge current when the voltage is below a certain value. I assume this is intended for Lead acid batteries? If the BMS issues a “do not discharge” command (due to low cell voltage), would it be safe to charge a 300Ah LiFePO4 system at 100 amps (12 volts) from an alternator and DC-DC converter such as the Buck-Boost?


The Victron smarty battery data sheet lists .5C as the recommended charge current, but it makes no allowance for battery SOC.

battery chargingLithium Battery
2 |3000
Toggle Comment visibility. Current Visibility: Viewable by all users

Up to 8 attachments (including images) can be used with a maximum of 190.8 MiB each and 286.6 MiB total.

1 Answer
boekel avatar image
boekel answered ·

What do you consider as 'higly discharged'? if they are at 11-12 volts you can use full current.

2 comments
2 |3000
Toggle Comment visibility. Current Visibility: Viewable by all users

Up to 8 attachments (including images) can be used with a maximum of 190.8 MiB each and 286.6 MiB total.

99sport avatar image 99sport commented ·

Thank you.


The Victron Smart Battery documentation says the default "safe to discharge" voltage limit is 2.8 volts. Assuming the BMS is working properly and the cells are well-matched the lowest voltage a 4 cell pack should ever see would be 11.2 volts (4*2.8), so 11.2 volts would be "highly discharged"

0 Likes 0 ·
boekel avatar image boekel ♦ 99sport commented ·

than you can charge at full power, no problem.

0 Likes 0 ·

Related Resources

Additional resources still need to be added for this topic

Additional resources still need to be added for this topic

Battery Compatibility

Did You Know - How to create a battery profile for non-Victron batteries?