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The dynamic 70% setting

The dynamic 70% setting

In Germany, it is regulated that installed PV systems must either be switched down by the grid supplier (this is done with a ripple control receiver) or a maximum of 70% of the nominal system output may be fed into the grid.

 

The fixed 70% setting

With this variant, the output of inverters is reduced to 70 % directly at the generator unit.
Example: A 10 kWp system, which produces 9 kW, is still throttled to 7kW.

As a result, direct consumption in the household can result in significantly less energy being fed into the grid at the feed-in point than one would actually be allowed to.


The dynamic 70% setting

Since this represents a power loss and part of the energy produced remains unused, there is a "dynamic 70% setting". For this purpose, no fixed setting is made at the inverter, but the power that still arrives at the grid feed-in point after the house consumers is measured with the aid of an energy meter.
Depending on the power requirements in the household, the inverter thus dynamically regulates its output, so that at the feed-in point the permitted 70% of the system output is fed in at the maximum.
Schematically represented:

With this variant you gain in the example mentioned just under 2 KW of power.
For this option, however, it must be considered that it is absolutely necessary to install an energy meter, since the inverter must know the data at the feed-in point in order to comply with the law.

 

21.03.2018 14:57
by Maik Wünsche

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