26
General informa-
tion about solar
modules
In order to select suitable solar modules and get the most efficient use out of the inverter,
please note the following points:
- The open circuit voltage of the solar modules increases as the temperature decreases
(assuming constant irradiance). The open circuit voltage may not exceed the following
values, depending on the altitude:
Symo 10.0-3 – 12.0-3 208-240
0 to 11,154 ft ( 0 to 3400 m). = 600 V
Symo 10.0-3 – 24.0-3 480
0 to 6561 ft ( 0 to 2000 m). = 1000 V
6531 to 8202 ft (2000 to 2500 m). = 950 V
8202 to 9842 ft (2500 to 3000 m). = 900 V
9842 to 11154 ft (3000 to 3400 m). = 850 V
If the open circuit voltage exceeds the values stated above, the inverter may be dam-
aged, and all warranty rights will become null and void.
- Note the temperature coefficients in the solar module data sheet
- More exact data for sizing the solar module for the particular location can be obtained
using calculation tools such as the Fronius Configuration Tool (available at https://
www.solarweb.com).
- See NEC table 690.7 for the appropriate voltage adjustment factor for crystalline sili-
con solar modules, or use the manufacturer’s specified voltage coefficients.
Connecting alu-
minum cables
The DC-side terminals are designed for connecting single-wire, round aluminum cables.
The following points must be taken into account when connecting aluminum cables due to
the non-conducting oxide layer of aluminum:
- Reduced rated currents for aluminum cables
- The connection requirements listed below
15.0-3 208 50 A
15.0-3 480/17.5-3 480/20.0-3 480/22.7-3 480/24.0-3 480 33 A/25 A
NOTE! Photovoltaic modules exposed to light supply current to the inverter.
NOTE! When using the cable inlets at the back, take care to seal them according
to protection class NEMA4X before operating outdoors.
NOTE! When connecting aluminum cables:
- follow all national and international guidelines regarding the connection of
aluminum cables
- follow the instructions of the cable manufacturer
- perform an annual check to ensure that the cables are firmly attached ac-
cording to the proper torque.
NOTE! When connecting DC cables, ensure the polarity is correct.
NOTE! Form a min. 4 in. cable loop with all cables.
NOTE! Before connecting solar modules, make sure that the voltage specified by
the manufacturer corresponds to the actual measured voltage.
Note the safety instructions and specifications of the solar module manufacturer
regarding solar module grounding.
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