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BQ24650: input from solar panel and fixed power supply?

Michele Bertoni1
Intellectual 340 points
Other Parts Discussed in Thread: BQ24650

Hi to all, I need to build a charger for 12V lead-acid battery so I've built board using BQ24650 with MCU and LCD display to monitor voltage and current for battery and load.

Solar panel: I can use a BQ24650 to charge battery, in this case suggested charge voltage of battery is 14,4 to 15,0 volt (I set charge voltage to 14,4V).

May I also use a fixed voltage power supply (x example 220Vac to 15Vdc) instead solar panel?

If using solar panel I have to set MPPT voltage at (x example) 17 volt, should I just set MPPT voltage to same DC output od power supply 15V and change battery charge voltage to 13,5V (as suggested as charging voltage for stand-by use)?

Or BQ24650 isn't suitable at all for this use?

Regards, Michele.

  • 0
    TI__Genius 11480 points

    Hi Michele,

    To answer your first question: you  can most definitely use a DC power supply instead of a solar panel. I would set my MPPSET voltage ~80% of  the power supply voltage. 

    The bq24650 is capable of charging a Lead-Acid battery -  you may be interested in this app note: 

    http://www.ti.com/lit/an/slva437a/slva437a.pdf 

    It explains how to use the bq24650 as a lead acid battery charger.

    One thing to note - if  you are using a 15V input, you will not be  able to charge your battery all the way up to  15V. The bq24650 has  a sleep comparator that will disable charging if the battery voltage is within a couple hundred millivolts of the input  voltage.