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BQ25570 Solarpanel current

Michael Liesenberg85
Mastermind 7560 points
Other Parts Discussed in Thread: BQ25570

Hi,

So the BQ25570 is working fine but the problem i am facing is that the solar panel is putting at 1V 100uA and the battery is charged with 10uA only.

I am using this solar panel: 

Why dos it flow so less current to the battery? How can i improve the current for charging the battery?

If i put an external power supply instead of the solarpannel, the BQ25570 consumes like 70mA from it and it charges the battery only with 13mA.

Regards,

Michael

  • 0
    TI__Genius 12485 points
    Michael,

    For testing purpose can you use a sourcemeter on both the battery and the VIN? What is the VBAT_OV setting? Any resistance path between VIN and the solar panel?

    thanks,
    Gautham
  • 0 in reply to Gautham
    Mastermind 7560 points
    Hi Gautham,

    yes i did that already. I put a source (2V 200mA) with currentmeter in VIN and on the battery a currentmeter.
    The VBAT_OV is set to 4.2V.
    I measure like 4.1V on VBAT and a charging current of 48mA. The BQ25570 consumes like 120mA out of the source.
    It looks like this:

    2V/4.1V * 120mA * 80% = 46,82mA

    So i think the BQ25570 is working fine but how do i impove my solarpanel settings to get the most out of it?
    I dont have any resistance between VIN and solar panel. Should i use one?

    Thanks,

    Michael