Ampster
Renewable Energy Hobbyist
Nothing hard about that either. If I remember correctly NMOT is just a reasonable guess about what the panel might produce versus SCT which is an estimate about perfect (or at least "test") conditions. I would not use either for deciding about series / parallel configuration. As repeatedly said by others, max voltage on coldest day is the main constraint.A harder question to answer is the NMOT business (as these panels are tested SCT in a super controlled environment,... including the light source and wind.)
Highest voltage at the coldest expected temperature should be how you decide how many cells you can put in series because voltage adds when in series.
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