What manufacturer and model if I may ask?
We have installed about 40k Yingli 230 modules in the past 18 months and as stated previously each combiner box is checked and each string's output (Isc and Vmp) are checked and so far all have had a voltage tolerance below 2% and a current tolerance below 3%, well below the rebate threshold.
The biggest issue we've had to date is the care and handling of the modules before, during and after their installation before turning the projects over to the owner, accidents happen and modules aren't cheap.
