The key specs for the in inverter are these:
However, some of the specs are unfamiliar or a bit confusing to me:
* What is the Full Load DC Voltage range vs the MPPT Range?
* What does "No. of Strings per MPPT tracker" mean?
* Does the 11A rating of the PV Input Current mean that is the most it will draw or will there be damage if it is allowed to draw more than that.
(Most MPPT units will only draw a certain amount and won't draw any more).
* The PV input voltage is 370V(100V-500V) What does that mean. What happens if the voltage is between 425 and 500?
Note for this analysis I will assume the range should be between the 150V start up voltage and the 425V top of the MPPT Range. (This is a conservative assumption)
Having said that we can go a long way in answering your questions anyway.
I *think* these are the specs for your panels:
Right off the bat I see a couple of things.
1) Since the start voltage of the inverter is 150 volts and the open circuit voltage is 49.6 V, you will have to have a Minimum of 4 panels in series to reliably start the MPPT.
2) Since the Impp is 10.98A and the most the MPPT will take is 11.53A, any parallel strings will be over paneling the MPPT.
3) The most number of panels that can be put in series without going over the 425V limit is 425/49.6=8 panels. However, that would leave almost no margin for even cool temperature voltage rise let alone cold temp voltage rise. 7 panels in series would give you ~22% margin for voltage rise and that would be good for all but the most extreme cold weather.
4) So.... the best configuration would be 7 panels in series for each MPPT input.
EDIT: Corrected the vollowing to use 500V as the max
Since you have 15 panels..... the question becomes "can you put 8 panels on one of the MPPT strings?" With the 8 Panels, you will have 49.6x8=396.8V @ 25C. That should operate correctly, but as it gets colder, the voltage will rise. If I am reading the spec correctly, there will be no damage below 500V. This means you have about 26% margin for temperature rise which is fine for the most extreme cold areas.
Now we have to understand what the MPPT will do between 425C and 450C. Will it not turn on? will it work but not try to track the voltage? Unfortunately, I just don't know so it is hard to advise you.
Note: For more information about adjusting Voc for temperature, please review this:
When designing you solar panel system, it is important to adjust you solar panel Voc for temperature in order to ensure you do not over-voltage the PV inputs of your solar charge controller. This paper shows how to calculate the Temperature...
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