Sma Grid Guard - SMA Sunny Boy 3000TL Installation Manual

SMA Solar Technology AG 3 Product Description

3.13 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
by entering 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-21 23