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BQ25306: Maximum input voltage from solar panel

ziad jabbour
Prodigy 70 points
Part Number: BQ25306
Other Parts Discussed in Thread: BQ25798

Tool/software:

Hello 

I am using the BQ25306 to charge 2S1P LiFePo4 batteries. 

in my nominal cases i have a fixed input voltgae of 12VDC

we are evaluating the possibility to use a A2V solar pannel 

we identified a 12V solar pannel with the open circuit voltage @22VDC, 

the absolue maximum of the BQ25306 input voltage is 28, ans since the solar pannelm will be mostly operating at 15 to 18VDC, 

do you see any counterindication to use the solar pannel with the BQ25306

looking forward for your feedback 

best regards

  • 0
    TI__Genius 12950 points

    Hello Ziad,

    I don't think BQ25306 can support charging from a solar panel because the BQ25306 does not have MPPT.

    I think using the BQ25798 would be a better choice. The BQ25798 also has the option for 2 different inputs.

    Let me know if you have any questions about these parts.

    Best Regards,
    Ethan Galloway

  • 0 in reply to Ethan Galloway
    Prodigy 70 points

    Hello Ethan

    Thanks for your reply 

    but my concerns i need to evaluate a fesability on actual design, the solar  pannel is some how oversized compared to the charging current can i have your feedback concerning the input voltage of the BQ25306

    best regards

  • 0 in reply to ziad jabbour
    TI__Genius 12950 points

    Hello Ziad,

    I don't think the BQ25306 would work here. Do you have a method for the BQ25306 to find the max power-point of the solar panel?

    If the BQ25306 draws too much current from the solar panel, the voltage and power of the solar panel will collapse. Keep in mind that the max available current from a solar panel will change throughout the day.

    Best Regards,
    Ethan Galloway