Installation and Operating Instructions V00
21
5.2 System layout of units without integrated DC switch
Local standards or codes may require that PV systems are fitted with an external DC
switch on the DC side. The DC switch must be able to safely disconnect the open-
circuit voltage of the PV array plus a safety reserve of 20%.
Install a DC switch to each PV string to isolate the DC side of the inverter. We
recommend the following electrical connection:
DC BOX
(optional)
AC BOX
DC INPUT
AC OUTPUT
To Grid
TO grounding electrode
+
-
PE
L
N
PE
INVERTER
Second
grounding
+ -
+
-
L
PE
N
5.3 Overview of the connection area
Damage to the inverter due to electrostatic discharge
•
Touching electronic components can cause damage to or destroy the
inverter through electrostatic discharge.
•
Ground yourself before touching any component.
