Relationship between the Charge Controller and the BMS

davecason

Hi,

I'm asking this again because I don't have a real understanding between the job of the charge controller and then the job of the BMS.  

I'm going to break them apart and treat each component as a seperate device.

I want to charge my 24 volt battery system to the maximum it can take to get the most out of each cell. (even at the expense of the cells life)

To charge the string can anyone suggest the best settings to charge a string of eight (8) cells to 28.4 volts max?  ( Lishen LP71173297 Cells - 272Ah 3.2vdc )

The charge controller is an EPEVER Tracer 4215 BN and I have sent a message to them asking the same question.

Cheers'

Dave










Any help is greatly appreciated!

Graham Parkinson

In a solar system, the charge controller and BMS typically have different jobs:

The charge controller is a generic device designed to function with a variety of battery types, if it's an MPPT (Maximum Power Point) unit it functions like an automatic transmission to adapt (step up or down) solar panel voltage to battery voltage.  If it's a Pulse Width Modulation unit it functions like a rapidly varying on-off valve to throttle the panel voltage down to battery voltage.

The BMS is a battery specific device designed to protect the type of battery it's attached to from; too high charging, from charging at too low temperature or from excessive discharge.   A simple BMS just disconnects the battery to protect it.  A more sophisticated BMS tells the charge controller via network commands things like:  More Voltage!, Less Voltage!, Current too high! etc. etc.