Grid Management; Varistors; Sma Grid Guard - SMA SUNNY BOY 3000TL Installation Manual

SMA Solar Technology AG 3 Product Description

3.10 Grid Management

The inverter is equipped with grid management functions.
Depending on the requirements of the network operator, you can activate and configure the functions
(e.g. provision of reactive power, active power limitation) via operating parameters (for information
on the functions and operating parameters, see the technical description "Measured Values and
Parameters" at www.SMA-Solar.com).

3.11 Varistors

Varistors are voltage-dependent resistors to protect the inverter against overvoltage. The inverter is
equipped with 3 thermally monitored varistors.
The function of the varistors can diminish with age or repeated strain as a result of overvoltage. This
can cause varistors to wear. The inverter detects if one of the varistors is defective and indicates a
disturbance.
The varistors are specially manufactured for use in the inverter and are not commercially available.
You must order new varistors directly from SMA Solar Technology AG.

3.12 SMA Grid Guard

SMA Grid Guard acts as an automatic disconnection device between a grid-parallel generator
(e.g. a PV plant) and the electricity grid.
Furthermore, SMA Grid Guard is a grid monitoring concept which reacts to errors by permanently
monitoring grid impedance, mains voltage and mains frequency. For example, SMA Grid Guard
detects when a stand-alone grid is formed and disconnects the inverter from the electricity grid
immediately.
In some countries, the connection conditions stipulate installation of a device which protects
grid-relevant operating parameters from unauthorised changes. SMA Grid Guard performs this
function.
Some country data sets are automatically protected after the first ten feed-in hours. After the initial ten
feed-in hours, the protected country data sets can only be changed via a communication product and
subject to entry of a personal access code, the SMA Grid Guard code (for information on how to
change parameters, see communication product manual). You can obtain the SMA Grid Guard code
from SMA Solar Technology AG (to apply for the SMA Grid Guard code, see certificate "Application
for a Personal Access Code" at www.SMA-Solar.com).
Installation Manual SB30-50TL-21-IA-en-20 23