Why is the specific annual yield not equal to the result for: energy produced by PV generator (alternating current side) / PV output?

The specific annual yield is calculated as follows:

specific annual yield = (energy produced by PV generator – energy from grid / (exact) PV output

Four decimal places are included in the calculation. The value for the energy from grid can be viewed in the "Results" – "Annual Energy Balance" dialog and in the Detailed Project Report.

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