Solar Energy Over Reading

My feed is Conergy Burnside 4879. I have three feeds being sent live via Xively to PVOutput namely Temperature, Solar Generation and Grid Power in. The total live Solar Generation shown for the day always over reads that shown by my inverter. I understand that PVOutput can only use the data it receives. Is there a rule that I can use to reduce the amount of solar power shown by a certain percentage? If so could you point me to the tutorial or give me an example of a formula I could use to achieve this outcome.

Reg

Reduce by 2%

power *= 0.98;

See documentation -

https://pvoutput.org/help.html#autoupload-rule

Thanks. I’ll gradually reduce the readings until they closely resemble that of the inverter.