Li-ion battery charger on lifepo4 batteries
- Thread starter pauldo
- Start date
dnmun
1 PW
if you have a 166S lifepo4 and it is a 36V pack then there is already a problem. 36V is 12S. do you know what battery you have?
if it is 12S and your charger is 42V then the battery cannot charge high enuff in voltage to allow the BMS to balance the pack so eventually it goes so far outa balance it has little useful capacity available.
if it is 12S and your charger is 42V then the battery cannot charge high enuff in voltage to allow the BMS to balance the pack so eventually it goes so far outa balance it has little useful capacity available.
dogman dan
1 PW
45-46v should be the maximum. If you already have the 42v charger, it still can be used as a spare, but it won't balance the pack.
I used to keep my too low voltage chargers at work, then get a good balance every night at home.
I used to keep my too low voltage chargers at work, then get a good balance every night at home.
dnmun
1 PW
you cannot have over voltage on the BMS. the BMS is a fuse in the negative lead of the battery. it is at ground at all times.
dnmun
1 PW
he said his charger put out 42V DC. only the battery and the charger are at that voltage. the BMS is at ground.
dogman dan
1 PW
In any case, this particular bms/battery pairing can tolerate up to 48v, but 45-46v is plenty.
42v will not balance the pack, but it will fully charge the pack if it happens to need no balancing. 42v divided by 12 is 3.5v per cell, a full charge. In the real world, more likely would be some cells at 3.3 and some at 3.8v.
No particular harm in using this 42v charger, but the battery will not likely stay balanced very long if you keep using it. You won't ever see all the lights on the bms light up. But you will see which cells are overcharged, when they light up. The bms will then discharge them.
42v will not balance the pack, but it will fully charge the pack if it happens to need no balancing. 42v divided by 12 is 3.5v per cell, a full charge. In the real world, more likely would be some cells at 3.3 and some at 3.8v.
No particular harm in using this 42v charger, but the battery will not likely stay balanced very long if you keep using it. You won't ever see all the lights on the bms light up. But you will see which cells are overcharged, when they light up. The bms will then discharge them.
dogman dan
1 PW
My mistake, I thought I remembered him saying it was a ping battery. Ping runs a higher charge on his bms.
For this one, the more typical top of charge around 3.6 -3.7 v per cell is more likely. 43.2v - 44.4v ballpark.
For this one, the more typical top of charge around 3.6 -3.7 v per cell is more likely. 43.2v - 44.4v ballpark.
