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External Power Meter
Note
With the Solar-Log™, the electricity fed into the power grid from a PV plant can be limited.
The actual reduction of output can be set as a fixed rate (kW or %) or dynamic with the local consump-
tion of the generated electricity factored into the actual reduction rate.
Recording the current consumption plays a key role when the local consumption is taken into account
for the reduction.
A consumption meter has to be installed to achieve an accuracy of +/- 2%.
It is not generally possible to achieve this accuracy with just a bidirectional meter at the grid connecti-
on point. The feed-in limits may be exceeded and there could be irregularities due to different measu-
ring, reading and control intervals. That is why we strongly discourage such installation and the use of
S0 meters.
Note
The Solar-Log™ offers the option of a „Fixed Regulation of X% with the Calculation of Self-Consumpti-
on.“
A general requirement for the fixed regulation of X% is that the inverters used allow the Solar-Log™ to
limit the output.
There is a major difference between Solar-Log™ compatible inverters when it comes to power reduc-
tions.
Some inverters cannot be limited to 0 watts or 0% of the generator output; they produce a certain
amount of residual power even when the output is set to zero. This needs to considered when desig-
ning plants with 0% output reduction. For example, the base load always needs to be greater than the
residual power output.
There is also a distinct difference between the reaction times of various inverters. The reaction time
also depends on the number of devices installed. It is not recommended to use S0 meters for 0%
reductions.
=> For these reasons, Solare Datensysteme GmbH cannot guarantee an absolute 0% feed-in reduction.
=> It is always necessary to consult the grid operator about the reduction.
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