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TIDA-010042: Using reference design with direct resistive load connected and no battery

Paul Kerspe
Prodigy 20 points
Part Number: TIDA-010042
Other Parts Discussed in Thread: SM72442

We are currently looking for a MPPT solution to directly power a resistive load (2.7 Ohm, 1000 Watt max power rating at 48V) from two parallel-connected solar panels providing up to 48V. No battery should be involved in this setup all power should directly be supplied to the load.

While evaluating a solution within the SM72442 we are also looking into the reference design TIDA-010042.

Before investing a lot of time on the individual solutions we are wondering if the reference design would also be suitable for directly connected loads bypassing the whole battery charging logic, directly outputting the power to the load, of course an adoption in the software would need to be considered (e.g. modifying or even bypassing the Load_Management() function.

Any input would be highly appreciated.

  • 0
    TI__Intellectual 1100 points

    Hello, 

    In principle there is not much concern to bypass the battery with direct connection to the resistive load. With 48V panels, 2.7 ohm load, the max power you can get is 853 W. Considering some margins for MPPT regulation, the max output power will be lower than 853 W. Pls note that the converter was designed to have constant current output. With 2.7 ohm load, the converter can't work at max 20 A for 48V max Vin. 

    Regards

    Lei

  • 0 in reply to Lei Song
    Prodigy 20 points

    Thank you for your reply , yes, I am aware that the resistance limits the current at the given voltage (if the panels would ever provide enough power), that is fine for us. My concern was more the general purpose of the circuit as a battery charger in combination with no battery present :-)
    Is there any other reference design you would know about that addresses our use case better without to much further modification?
    At the end the simpler the better since we are talking about a potential production quantity of the final product in the 500k-1M. range so every cent counts. We are still in the very beginning considering different options on how to tackle the problem and find a good compromise between energy efficiency and costs.

  • 0 in reply to Paul Kerspe
    TI__Intellectual 1100 points

    Understood. No, we don't have other better options. The TIDA-010042 is max power of MPPT so far we have.