Experts,
I am using three of these cell-meters to keep my 20S 50Ah LiFePO4 always under control. It has a ground pin and 7 cables to connect to a series of 7 cells to provide individual voltage reading: It works pretty well indeed. Considering a current draw of 35ma on the ground pin, I initially thought to leave it always on; it will take 1400 hours to discharge the battery ~59 days.
But then a doubt came into my mind after I noticed that after one week the voltage of the first two cells was consistently lower than the other cells: are we sure that it draws the same current from every cell?
So I decided to measure the draw from every pin and, surprise surprise, it basically draws almost entirely from the second pin !! So I have offset the first two cells by almost 6Ah during this week.
These are my reading:
Thanks,
Luca.
http://eclipsebikes.com/cell-checker-voltage-alarm-lipoliionlimnlifepo4-p-1090.html
I am using three of these cell-meters to keep my 20S 50Ah LiFePO4 always under control. It has a ground pin and 7 cables to connect to a series of 7 cells to provide individual voltage reading: It works pretty well indeed. Considering a current draw of 35ma on the ground pin, I initially thought to leave it always on; it will take 1400 hours to discharge the battery ~59 days.
But then a doubt came into my mind after I noticed that after one week the voltage of the first two cells was consistently lower than the other cells: are we sure that it draws the same current from every cell?
So I decided to measure the draw from every pin and, surprise surprise, it basically draws almost entirely from the second pin !! So I have offset the first two cells by almost 6Ah during this week.
These are my reading:
- PIN microA
ground 35000
1 50
2 33000
3 150
4 250
5 300
6 390
7 410
Total 34550
Thanks,
Luca.
http://eclipsebikes.com/cell-checker-voltage-alarm-lipoliionlimnlifepo4-p-1090.html