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Original question:

TIDA-00120: Increasing Output Power to 300W

TIDA-00120: Paralleling Multiple MPPT Charge Controllers

Antonio Fadhel
Genius 9410 points
Part Number: TIDA-00120
Other Parts Discussed in Thread: TIDA-00121, TIDA-00476

Hi,

My customer is working on a 500W solar charge controller and would like to know if they could parallel 4x TIDA-00120. I would think the MPPT circuitry would ensure each circuit will not exceed the panel rating, but am wondering if there would be concerns with the battery reverse protection circuitry (or if it can act as a typical ORing controller and avoid the need for additional circuitry).

Can you please comment on any potential issues or required changes to support paralleling multiple TIDA-00120?

Thanks,

Antonio

  • 0
    TI__Expert 3860 points

    Hi Antonio,

    If the battery voltage is 24V, this design can handle 500W. The only reason it was not tested at 20A was thermal. If provision is made for heatsinking of the MOSFETs and larger inductor is used, it can be taken to 20A. I didn't understand the need for paralleling 4xTIDA-00120 for supporting 500W. Even if it is a 12V system, 2-phase interleaving is still feasible by redesign of the power stage. Paralleling option is not cost optimal.

    You can still parallel them. In fact they are designed to be connected in parallel on the battery side - the output is a voltage limited current source. Paralleling on the panel side can create issues with MPP tracking.

    If the reason for connecting them in parallel is because the panels are low power, please look at TIDA-00121 or TIDA-00476. They are lower current designs.

    Regards,

    Salil