PowerManagement covers everything that has to do with influencing the inverters on the part of the energy suppliers.

  • Power reduction
  • cos PHI (reactive power)
  • 70% regulation

In the EnergyMaster, respectively e.manager you can deactivate the ports (RS485 1, LAN, etc.) on which no PowerManagement should be performed on the local web page of the device under Configuration = > Advanced Settings.
At all other interfaces the signals are passed on to the inverters for control (power reduction)!

power reduction

You can realize the power reduction to 0, 30, 60 or 100% via the digital and the analog inputs.
The e.manager offers two different setting options.
Make sure that only one of the two settings is active at any time.

Simple setting

Configuration = > Configure devices
If each relay contact from the ripple control receiver means a unique power reduction, please choose this setting.

Default setting

  • Digital input 1: 100%
  • Digital input 2: 60%
  • Digital input 3: 30%
  • Digital input 4: 0%


Set the required input to Ripple control receiver under Configuration => Configure devices.
Enter the required power reduction (power reduction to 60% => 60) in percent.
  • If an input is closed, the power is reduced to the specified  power.
  • If no input is closed the power is set to 100%.
Check the settings by setting a jumper.
Expert setting (from firmware 0.6.7)

With the "Expert setting" you can combine different switching states, so that a power reduction occurs if e.g. two specific inputs are activated at the same time and not only one.

Please deactivate the Simple setting.

Set the desired input to digital under Configuration = > Configure devices. Assign a unique name, e.g. K1, K2, ...
You can use both the digital inputs and the analog inputs for this purpose.

If you use digital and analog inputs, make sure that they work with different potentials and must therefore be wired separately.

Under Configuration => Power reduction you will now find the activated inputs. Now you can enter up to 10 variants with corresponding percentages.

Check the settings by setting a jumper.

70% Regulation

If you operate a PV system with the 70% control, you can increase here a dynamic readjustment of the inverters and an additional increase in self-consumption by connecting consumers.


It is absolutely necessary that the fed-in power can be measured or calculated. For this purpose, the residual feed-in can be measured directly or calculated via the total consumption.

(PV power - total consumption)  = Residual feed-in

The residual feed meter or the total consumption meter can be connected via the S0 or D0 interface. You get the best accuracy and updating via D0 counters.



Residual supply via S0: not fail-safe
Residual feed via D0, RS485 or LAN: fail-safe, (if the meter fails, the inverters are regulated to 70% across the board)
Total consumption meter via S0: fail-safe, (if the meter fails, the inverters are regulated to 70% across the board)
Total consumption counter via D0, RS485 or LAN: fail-safe, (in case of counter failure, the inverters are regulated to 70% across the board)



Under Configuration => Configure devices, you must specify the connected DC power for each inverter.
Under Self-consumption => Settings you activate the 70% control and specify the maximum AC power that may be fed in.
In this case, the inverters are permanently set to 70% of the maximum power.
Of course, you can also select any other percentage.

For a control of the PV power, the inverters must be connected to the e.manager via RS485 or LAN and also have the possibility to be controlled steplessly. Prerequisite for a control is the appropriate firmware of the inverters, as well as the implementation of the inverter manufacturer in e.manager. A list can be found on the following page (supported inverters).



When readjusting, the maximum possible inverter power is increased when the inverter power has reached the current maximum power and the fed-in power is below 70%.
Simplified: A 10 kW system feeds in 7 kW (70%).
If there is now the possibility that in-house consumers can use the remaining 3 kW, the inverters receive the command to produce more power, since this excess power is not fed into the public grid.
The increase of the power depends on the current solar irradiation and therefore on the current maximum producible power of the inverters, as well as on the energy consumption of the consumers.

Activate readjustment under self-consumption => settings.



10 kW PV system with 70% control.

  • Power limitation 70%
  • Consumption is 1kW
  • PV power increases to 7kW, feed-in 6kW => Power limitation to 80%
  • 1. PV power 8kW, feed 7kW => Power limitation remains at 80%
  • 2. an additional consumer is switched on
  • PV power 8kW, feed 6kW => 3. power limitation to 90%
  • PV power 9kW, feed 7kW => Power limitation remains at 90%
  • 4. additional consumer is switched off
  • 5. PV power 9kW, feed 8kW => immediate power reduction to 80%
  • PV power increases to 7kW, feed-in 6kW => power limitation remains at 80%
The e.manager permanently checks if the fed-in power is higher than 70%. In this case an immediate power reduction would take place. A possible increase of the maximum power is checked every minute. Depending on the update interval of the individual measured variables, an excessive power is usually reduced within 10 seconds.


If a power reduction is to be realized due to grid limitations, there may be an increased grid load for the time until the inverters are regulated down.


  • Industrial building
  • 500kW installed power
  • max. 50kW feed-in

Initial situation:
  • PV power 450 kW
  • own consumption 400 kW
  • Feed-in 50 kW

Problem case total failure e.g. of the production line:

  • PV power 450 kW
  • Own consumption 50 kW
  • Feed-in 400 kW

For a few seconds a much too high power is fed in, which could overload the grid.