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Solar-Log
1000
User Manual
2.5.3 Pac Correction Factor
At photovoltaic plants, several measuring points and power generators
(inverters) are combined with one another. The Solar-
Log™ evaluates
this data and partially looks for any correlations.
Since some of the components are not calibrated, deviations in the val-
ues measured can easily arise.
For example, if the total amount of energy produced based on what the
inverters display is compared with the values from calibrated power me-
ters, deviations of up to 8% can arise.
In practice, meters and inverters both can display too much or too little
kWh.
To correct these inaccuracies in the medium term, the Solar-
Log™
firmware uses a PAC correction factor.
Note
A calibrated power meter has a tolerance of +/- 1 % and
an inverter has a tolerance of +/- 8 %.
From experience, if the the deviations are greater than 8-
10%, there is a problem somewhere else and the measur-
ing devices are not the source of this deviation.
2.5.4 Calculating the PAC correction factor
All of the yield data is saved internally without the correction factor. The
correction factor is only applied to the data output. The factor can there-
fore be adjusted at any time.
The formula for calculating the correction factor is as follows:
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