PV Modules manufacturer wattage tolerance and performance calculations
We install utility sized PV generating facilities, 10 MW+. Our client is proposing to furnish 280W "nominal" modules with a tolerance of +5%/-3%. In other words we could end up with 272 watt and 294 watt modules in the same crate. It is my understanding that our performance calculations should be based upon the lowest wattage module in the string? The manufacturer has taken the position that sorting the modules is not necessary???? What say the experts, I'm the site layout and civil guy, so sorry in advance for my ignorance of all things electrical, it just smells wrong to me.
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