# Connecting BMS to charge controller and load

Im trying to design a circuit that the load will get power from solar panel or a battery (in case the solar panel will not deliver enough current\voltage)

Also wanted to mention that this is a hobby, so I dont have deep knowledge in electronics..

So the question is about connecting charge controller and BMS-2S to load

1. 12v solar panel connected to charge controller as input
2. 2S (3.7 each) Li-Ion batteries


about the BMS, it says that pins P+ connected to charger+ and load+. And P- connected to charge- and load-.

Connecting that way, that the BMS and the load are parallel to charge controller, will not interrupt the charge controller main goal? Im wandering how it will affect the Constant Current and Constant Voltage mechanism.

Im not sure that the load supposed to be connected that way, ill be happy for guidance.

Thanks

• Did you find your answer? I'm also wondering if load and BMS in parallel impacts charging. Mar 14, 2021 at 19:12
• The charge controller will probably never finish its charge cycle because the RPi will draw a significant amount of current. This will confuse the charge controller into thinking the batteries are not yet full. The LiIon batteries will therefore be under constant charge, which will kill them in a short amount of time. Jan 7 at 9:16