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BQ24650: Want to use one solar panel to drive two BQ24650

Jeff Coletti
Expert 8755 points
Part Number: BQ24650

Hi Support team

I have a customer who is working on a modular system. There is one solar power and two different modules with batteries. They want each module to have a 

BQ24650. Can i use two BQ24650 powered by a single solar panel. Modules are independent. Would I need an interconnect to keep them both in sync such that one module does not steal all the current?

In there system, you can populate either modules or both modules. Moving the BQ24650 to the solar panel adds additional cost and they would prefer to not do this.

I can provide more info via email.

Regards

Jeff Coletti

  • 0
    TI__Mastermind 25800 points
    Hey Jeff,

    I would be mindful of the two charger's MPPSET loops fighting each other to regulate the solar panel input voltage.

    it is likely that you will see the scenario you describing where one device will continue to decrease charge current if the load continue to increase and the other not.
    It is also likely that both will decrease.
    And even more likely, a combination of these two.

    I think even with an interconnect, each charger's loop will fight each other. At the end of the day, the MPPSET loop is trying to prevent the voltage on the solar panel from going lower than the set point. When either charger pulls current, the solar panel voltage will fall with it by the nature of solar energy harvesting. In that case, both chargers will ultimately feel that dip in voltage and try to regulate.


    Regaerds,
    Joel H