Tigo ts4-a-o Voltage limitation

Comments

9 comments

  • Avatar
    Curtis Community Moderator

    Hello Christian Henn

    Thank you for your contribution to the Tigo Community!

    You have not provided the Voc/Vmp of the PV modules, so the calculation cannot be made. However, we can talk about what 'may' be happening...

    If you are running 11 x 415W panels, that's only 465.5W total at standard operation. However, if the voltage is very close to the maximum, you may be required to reduce the string size during cold weather. This is due to the module's thermal coefficient, as the panels may exceed the specified voltage output in cold conditions.

    It may be worth it to compare the datasheets of both the Modules and the Inverter again to see if the accumulated voltage is too high for the string input on the Inverter. 

    For more information on Thermal Coefficient, please see: 
    How to Calculate a PV Module's Voltage (Voc) for Different Ambient Temperatures

    If you require assistance making these design choices, please contact Tigo Support

    0
  • Avatar
    Christian Henn

    Hi Curtis,
    thanks for replying.
    I know the physics and also that I have too much modules for my inverter (bigger with batteries is coming later)
    I have that much modules to get more power at bad weather at the moment.

    Without the optimizer I never had this issue.

    As the optimizer is basically a special kind of DC DC converter, my idea was to adjust the software to have higher current and lower voltage, at least to not get over 490V

    But I expect this is not possible?

    0
  • Avatar
    Curtis Community Moderator

    Hello Christian Henn,

    Thank you for your reply. 

    The Tigo Optimizers actually reduce voltage to create more current. The Optimization proccess is fully described in this article:

    Optimization with Predictive IV and Impedance Matching

    With that being said, I do not know if an adjustment method or limiter software update is available for the TS4s. This is something that you would have to discuss with Tigo Support. I have opened up a ticket for you. An Engineer will be in contact to evaluate the issue very soon.

    Thank you for your patience with this process.

    0
  • Avatar
    Greg Smith Community Moderator
    Early Adopter

    Christian, 


    Did you use a string sizing program to calculate the number of modules per string and the maximum number of strings? If your string sizing is off, then there isn't much our optimizers can do to correct a poor design. Adding a battery will not help this issue since it does not affect array voltage. You will still have inverter tripping at 500V.

    Continued overvoltage may cause stress to the inverter capacitors and that may not be covered by warranty. Or, it may just be an irritatingly low safety limit imposed by the inverter manufacturer. That is an adjustable setting, but you would need to contact the PV inverter manufacturer.

    0
  • Avatar
    Christian Henn

    Can anyone may just answer my question and not talk about other things???
    The design is at the limit, with load ot works fine.
    If the inverter reduces power to not provide power to the grid, the voltage rises as less current is drawn.

    My question was not about design or working princip of electricity

    Basic yes no question

    Can I set a may voltage to each optimizer?
    Yes or no ?

    0
  • Avatar
    Curtis Community Moderator

    Hello Christian Henn,

    Thank you for your reply. 

    Each system design is different, and there may be inherent issues that are unforeseen. For this reason, a question like this is not answerable with a simple yes or no. It requires a personalized review and only the qualified Engineers at the Tigo Support Team can confirm if this is a possibility for products associated with your system.

    To make this easier, I have opened up a ticket for you. An Engineer will be in contact to evaluate your system and provide an answer, very soon.

    Thank you for your patience with this process.

    0
  • Avatar
    Greg Smith Community Moderator
    Early Adopter

    No, you cannot set a voltage.

    0
  • Avatar
    Christian Henn

    That was an very easy answer, don't know why everyone made it that complicated

    0
  • Avatar
    Arūnas Viršilas

    Is it possible to parallel two groups with the same solar panel and the same number of modules that are formed after the voltage of 490v. Optimizers are installed on all modules. to converter to one mppt? this would be a solution when the maximum allowable inverter voltage is 500v. and amperes 60A. Is such a connection possible? I am attaching a photo of how I should connect the optimizers.

    0

Please sign in to leave a comment.