Blog - Micro-Inverters

Understanding the EN 50438 for MicroInverter Operation

Understanding the EN 50438 for MicroInverter Operation

03.Aug 2016
| Blog - Micro-Inverters

 

Understanding the EN 50438 for MicroInverter Operation

The EN 50438 gives the specifications of the Grid parameters. The microiverters are required to operate within the limits of this EN standard.

The parameters mean if the grid frequency is above 52 Hz or bellow 47.5 Hz, the microinverter has to stop operation in max 0.5 s. 

If the voltage is above 264.5 V or bellow 195.5 V, the microinverter has to stop operation in max 0.2 s.

In case the voltage is above 253 V and bellow 264.5 V for longer that 600 seconds (10 minutes), the microinverter has to stop working as well. (This is required by EN 50160.)

In case the there is no grid (voltage is 0 V or bellow 195.5 V), the microinverter must disconnect in 0.2 seconds. If fact the disconnection time of the microinverter is about 50 ms (0,050 seconds, max 5 half waves of the sine curve.)

Moreover Germany (and some other countries) give a regulation that says that in case that frequency is above 50.2 Hz it is necessary to reduce the power (VDE4105). However this standard applies only for inverters that feed energy to the public grid. It is not applicable for the self-consumption installations.

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