gogreenpower
100 mW
Hi guys,
Just built my first battery and during some final checks before heat shrinking I've noticed a difference in voltages when measuring the actual battery cells and the XT90-S connector at the end of the discharge/charge wires.
I would have expected that the voltages would have been the same, unless there is some BMS trickery going on I'm not aware of.
I've not charged the cells yet and they all came at 3.4v.
It's a 14S 5P battery and currently the voltage is 47.6 when measured off the actual parallel groups which works out to be 3.4v per parallel group. All good.
When I measure at the discharge/charge plug the voltage is only 43.5v. Does the BMS take a bit off as part of its designed protection systems or have I totally messed something up?
Here is a pic of the schematic marked with where I am measuring said voltages.
https://www.dropbox.com/s/4t7b8j73v36mjm3/BMS.jpg?dl=0
Plus a few of the build in case anyone is interested.
https://www.dropbox.com/sc/27vyj0f6nvdrapb/AADvPLxu9DNmMLuHUkRike-Ca
Just built my first battery and during some final checks before heat shrinking I've noticed a difference in voltages when measuring the actual battery cells and the XT90-S connector at the end of the discharge/charge wires.
I would have expected that the voltages would have been the same, unless there is some BMS trickery going on I'm not aware of.
I've not charged the cells yet and they all came at 3.4v.
It's a 14S 5P battery and currently the voltage is 47.6 when measured off the actual parallel groups which works out to be 3.4v per parallel group. All good.
When I measure at the discharge/charge plug the voltage is only 43.5v. Does the BMS take a bit off as part of its designed protection systems or have I totally messed something up?
Here is a pic of the schematic marked with where I am measuring said voltages.
https://www.dropbox.com/s/4t7b8j73v36mjm3/BMS.jpg?dl=0
Plus a few of the build in case anyone is interested.
https://www.dropbox.com/sc/27vyj0f6nvdrapb/AADvPLxu9DNmMLuHUkRike-Ca