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TIDA-00640: TIDA-00640

Raymond Koosha4
Intellectual 300 points
Part Number: TIDA-00640

Hello,

I like to use TIDA-00640 Reference Design to monitor, Voltage & Current, of individual solar panels that are connected in series and in parallel.

I appreciate your response on the following questions:

1. Is this reference design appropriate for the above application?

2.  Can I add a MOSFET on the "hot " or "return" line?

3. Is there a tool that I can use to simulate the design?

I look forward to hear back from you on the above three questions.

Regards,

Raymond Koosha

  • 0
    TI__Expert 3860 points

    Hi Raymond,

    Yes, this reference design is suitable for your application. You can add a switch on 'hot' or 'return' lines, as the circuit is powered from the panel. Currently there is no model available to simulate this design.

    Regards,

    Salil

  • 0 in reply to Salil
    Intellectual 300 points

    Hi TI Technical,

    I am going to use 10 Solar panels in a series string and will be using 9 of TIDA-00640 modules.

    I see a problem with the "Ground " on the 2nd, 3rd, and 9th module.

    Please could you explain, with a diagram, how this module can be implemented in my application.

    Looking forward to hearing on the above subjects.

    Regards,

    Raymond

  • 0 in reply to Raymond Koosha4
    TI__Expert 3860 points

    Hi Raymond,

    I don't understand the problem. Since the communication is wireless, each panel can sit at its own ground potential. You need to connect the PV IN+ and PV IN- to the panel terminals. Afterwards, the PV OUT+ and PV OUT- becomes the terminals of the panel. Any series/parallel connection you make is to these terminals only.

    Regards,

    Salil

  • 0 in reply to Salil
    Intellectual 300 points

    Hi Salil,

    When two panels are connected in series, and when you want to connect another module between PV+ and PV- of the second panel (The panel on top of the first one)
    Then you have problem with the ground. Why? This is because, the PV- of the second panel is at PV+ of the first panel. This means, we might need to fix a ground for the top panel.

    I hope the problem makes sense now.

    Regards,

    Raymond

  • 0 in reply to Raymond Koosha4
    TI__Expert 3860 points

    Hi Raymond,

    I think we are talking about different configurations. As I understand about this design, you need to have one TIDA-00640 per panel. Then there is no need to worry about the individual ground potential of any panel. For any outside connection, the terminals are PV OUT+ and PV OUT-. Individual panels have its own floating ground.

    Regards,

    Salil

  • 0 in reply to Salil
    TI__Expert 3860 points

    One correction here - we can decide how many panels we need to combine together for monitoring. For example, we can take two panels connected in series/parallel as one unit and use one monitoring circuit for it. Now it becomes a single unit and any further connection will be on the unit level only.

    Regards,

    Salil

  • 0 in reply to Salil
    Intellectual 300 points

    Hello Salil,

    There is no problem with two panels connected in series or in parallel. The problem is when there are more than two gets connected.

    My question to TI is this:

    Will TIDA-00640 work when it is connected to to each PV Panel of a series string of 10 panels?

    I do see a problem with reference Ground for the modules for PV Panel 2, 3, ..., and 10.

    I hope this is clear know and hope TI can give me assurance that their product can work in my application.

    Thanks,

    Raymon

  • 0 in reply to Raymond Koosha4
    TI__Expert 3860 points

    Hi Raymond,

    I am not an authorized person to give assurance on TI's behalf. What I can say is only from my personal capacity as a system designer. The document that assures operation of a TI device is the datasheet. If the device is operated within the limits specified in the datasheet, it will work.

    I think TIDA-00640 will work in an application with one circuit per panel, provided external connections are made only to the output terminals of the circuit.

    Regards,

    Salil