31
EN-US
Connecting Solar Module Strings to the Inverter (DC
side)
Safety
WARNING! An electric shock can be fatal. Danger from grid voltage and
DC voltage from solar modules that are exposed to light.
- Prior to all connection work, disconnect the AC and DC supply to the inverter.
- The DC main switch is used only to switch off power to the power stage set.
When the DC main switch is turned off, the connection area is still energized.
- Maintenance and service work on the inverter power stage set should only
be carried out by Fronius-trained service technicians.
- All maintenance and service work should only be carried out when the invert-
er and the mounting bracket have been disconnected from each other.
- The inverter must only be disconnected from the mounting bracket after be-
ing disconnected from the mains power.
- Only an authorized electrician is permitted to connect this inverter to the pub-
lic grid.
WARNING! An electric shock can be fatal. Inadequately sized electrical compo-
nents can cause serious injury and damage to property.
- All electrical connections must be made in accordance with the national stan-
dard (e.g., for the US National Electrical Code, ANSI/NFPA 70) and any oth-
er regulations applicable to the installation site.
- Use min. 194°F (90°C) copper wire for all grounding wires (see NEC table
250.122).
- Voltage drop and other considerations, such as improving power quality, may
mean larger cable cross sections need to be used.
WARNING! Work performed incorrectly can cause serious injury and damage.
The surge protection device should only be installed and connected by licensed
electricians.
Follow the safety rules!
Before any installation or connection work is carried out, disconnect the AC and
DC supply to the inverter.
CAUTION! Danger of damaging the inverter due to improperly connected termi-
nals. Improperly connected terminals can cause thermal damage to the inverter
and may cause a fire. When connecting the AC and DC cables, make sure that
all terminals are tightened securely using the proper torque.
CAUTION! Overloading the inverter may damage it.
- Observe the maximum current carrying capacity of the various power cate-
gories (see Table A).
- Only connect a maximum of 33 A to each DC terminal.
- Connect the DC+ and DC- cables to the correct DC+ and DC- terminals on
the inverter.
- Observe the maximum DC input voltage.
Table A
Power category Maximum current carrying
capacity
MPP1 / MPP2
10.0-3 208–240 / 12.0-3 208–240 25 A/16.5 A
15.0-3 480 / 20.0-3 480 / 22.7-3 480 / 24.0-3 480 33 A / 25 A
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