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BQ24650: BQ24650

quentin Valenti
Prodigy 10 points
Part Number: BQ24650


Tool/software:

Question Regarding MPPT Module Functionality

Hello,

I don’t fully understand the benefit of the BQ24650 module. To my knowledge, an MPPT should fix the voltage at the maximum power point (Vmp) to draw the maximum current from the solar panel.

However, when testing your component, the voltage does not stay fixed at 18V (Vmp) but rises to 20V. Additionally, when comparing my system with and without the MPPT, the current is higher without it.

Can you explain the actual benefit of integrating this module into our system under these conditions?

Also, I am working on a design for mass production, with millions of units per year for one of my clients. Would it be possible to arrange a video call for more detailed technical support?

Thank you in advance for your response.

Best regards,

Quentin 

  • 0
    TI__Mastermind 35446 points

    Hello Quentin,

    quentin Valenti said:
    However, when testing your component, the voltage does not stay fixed at 18V (Vmp) but rises to 20V. Additionally, when comparing my system with and without the MPPT, the current is higher without it.

    I recommend refering to section 8.3.2 Input Voltage Regulation in the datasheet:

    If the solar panel or other input source cannot provide the total power of the system and BQ24650 charger, the input voltage drops. When the voltage drops to the programmed 18V(VMP), the charge current will decrease to maintain this voltage. 18V is the min, since the voltage rise to 20V, I assume the system load is low and does not require as much power, if you increase this load, or decrease the input current limit, you should see the MPPT feature operation.

    Best Regards,

    Christian.

  • 0 in reply to Christian Moyer
    Prodigy 10 points

    During our tests, we observed that when the solar panels produce 20V, the battery receives 100mA with the MPPT activated and 113mA without the MPPT, at the same voltage. Could you please explain this behavior and how the MPPT works in this case?

    Thank you in advance for your response.

  • 0 in reply to quentin Valenti
    TI__Mastermind 35446 points

    Hello Quentin,

    quentin Valenti said:
    During our tests, we observed that when the solar panels produce 20V, the battery receives 100mA with the MPPT activated and 113mA without the MPPT, at the same voltage.

    How are you changing the status of MPPT from active to not active?

    Best Regards,

    Christian.

  • 0
    Prodigy 10 points

    Hello,

    I'm comparing two systems: one with an MPPT adaptation circuit and another without it, where the battery and the solar panel are directly connected.

    I don't see any real optimization when using the MPPT circuit.

    So, how can I properly validate the MPPT, and what results should I expect?

    Thank you in advance,

    Quentin valenti

  • 0 in reply to quentin Valenti
    TI__Mastermind 35446 points

    Hello Quentin,

    quentin Valenti said:

    I don't see any real optimization when using the MPPT circuit.

    So, how can I properly validate the MPPT, and what results should I expect?

    I recommend refering to section 8.3.2 Input Voltage Regulation in the datasheet:

    If the solar panel or other input source cannot provide the total power of the system and BQ24650 charger, the input voltage drops. When the voltage drops to the programmed 18V(VMP), the charge current will decrease to maintain this voltage. 18V is the min, since the voltage rise to 20V, I assume the system load is low and does not require as much power, if you increase this load, or decrease the input current limit, you should see the MPPT feature operation..

    Best Regards,

    Christian.