6 Electrical Connection
SMA Solar Technology AG
Operating manual
SI44M-80H-13-BE-en-15
58
WARNING
Danger to life from electric shock due to incorrect connection of the neutral conductor ins
single systems and single-cluster systems
In single systems and single-cluster systems, the neutral conductor of the external energy source is firmly connected
to the neutral conductor of the Sunny Island inverter on connection
AC2 Gen/Grid N
. Upon disconnection of the
external energy source, the Sunny Island only disconnects the line conductor on connection
AC2 Gen/Grid N
. The
Sunny Island disconnects all poles from the external energy source on connection
AC2 Gen/Grid N
TT
. If the
neutral conductor is incorrectly connected on connection
AC2
, the protective functions in the system can fail. This
can result in death or serious injury.
• Always connect the neutral conductor to the connection
AC2 Gen/Grid N
TT
in systems for increased self-
consumption.
• Always connect the neutral conductor to the connection
AC2 Gen/Grid N
TT
in battery backup systems.
• Always connect the neutral conductor of the generator to the connection
AC2 Gen/Grid N
in off-grid
systems.
CAUTION
Danger of crushing when locking levers snap shut
The locking levers close by snapping down fast and hard.
• Press the locking levers of the terminal block for the AC cable down with your thumb only.
• Do not grip the entire terminal block for the AC cable.
• Do not place your fingers under the locking levers.
Procedure:
1. Move the levers of the terminals upward at
AC1
or
AC2
.
2. When connecting the cable to connection
AC1
, attach the M25
cable gland to the
AC1
enclosure opening using the counter nut
(torque: 7 Nm).
2
1
3. When connecting the cable to connection
AC2
, attach the M25
cable gland to the
AC2
enclosure opening using the counter nut
(torque: 7 Nm).
2
1
4. Remove the cable jacket and strip off 13 mm of the the insulation of all conductors.
5. Lead the cable through the cable gland into the Sunny Island.
6. Connect the insulated conductors to
AC1 Loads/SunnyBoys
or
AC2 Gen/Grid
. Insert the neutral conductor as
far as it will go into terminal
N
or
NTT
and push the lever down.