Question-and-Answer Resource for the Building Energy Modeling Community
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I'm afraid you can't calculate that. You have to get that information from the designer of your exact PV system. If it is not designed yet, or that information is not available, maybe you can guess from the type of the inverter:
If you know, that your inverter's nominal voltage is e.g.: 51 V, then you can assume, that there are 3 panels in series, because your panel's max power voltage is 16.9V and 51 / 3 is almost 16.9. So in this case the Number of Modules in Series will be 3 and the Number of Series Strings in Parallel will be the sum number of your panels / 3.
If you don't know anything about your inverter, then use an ElectricLoadCenter:Inverter:Simple. In this case maybe (this is just my guess) the voltage and current figures of the whole array are irrelevant, because maybe (this is just my guess again) e+ uses the voltage only to calculate inverter efficiency in case of a more complicated inverter object, like ElectricLoadCenter:Inverter:LookUpTable
Generally if you have limited available information on the systems that you want to model, use simple models, because sometimes increasing complexity may just increase overall estimation error:
