Reactive Power Control; Zero Export; Active Power Limitation; Direct Selling - SMA DATA MANAGER M Operating Manual

4 Product overview SMA Solar Technology AG
The setpoints from the grid operator can either be implemented via open-loop control or closed-
loop control. The setpoints are specified via Modbus, analog or digital signals or manually via the
user interface. The implementation of the setpoints is reported back to the grid operator.

4.6.13 Reactive Power Control

The reactive power control can take place through direct parameter settings (Q, cos φ) in the
installation assistant, as a variable specification from the grid operator via the Modbus interface or
via analog signals. The reactive power control as characteristic curve function can also be
regulated as a function of the voltage at the point of interconnection Q(V). The values are specified
as a percentage of the maximum AC power. A proper meter for measuring the relevant electrical
variables (V, P, Q) is required at the grid-connection point. A pure voltage measurement is not
sufficient. A suitable energy meter is also required at the point of interconnection for cos φ
specifications in control mode.

4.6.14 Zero export

Some grid operators permit connection of PV systems only on condition that no active power is fed
into the utility grid. The PV energy is therefore consumed exclusively at the place where it is
generated.
When specifications at the point of interconnection are actively controlled, this product enables the
limitation the active power feed-in for the connected SMA inverters and of third-party inverters to
0% as long as these are connected via SunSpec Modbus and support this function.

4.6.15 Active Power Limitation

The setpoint for active power limitation is specified in percent. The total system power is taken as
the reference value. The setpoints are specified via Modbus, analog or digital signals or manually
via the user interface.

4.6.16 Direct selling

A direct marketer can use the product for remotely controlling the system via the built-in direct
marketing interface. In this process, control signals of the direct marketer are transferred to the
system. The function is activated via the user interface of the product.

4.6.17 Device Key (DEV KEY)

If you have forgotten the administrator password for the product, you can reset the administrator
account with the device key and assign a new password. The device key can be used to prove the
identity of the product in digital communication. The device key is located on the type label of the
product.
24 EDMM-20-BE-en-10 Operating manual