38
General Informa-
tion about Solar
Modules
In order to select suitable solar modules, observe the following points:
- The open circuit voltage of the solar modules increases as the temperature decreas-
es, assuming constant irradiance. The open circuit voltage may not exceed the follow-
ing values, depending on the altitude:
- 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 as the inverter records the last
DC voltage in the system meaning that non-compliance with the maximum permitted
limits can be checked.
- Note the temperature coefficients in the solar module data sheet
- More exact data for sizing the solar modules for the particular location can be obtained
using calculation tools such as the Fronius Solar.configurator (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.
NOTE!
Before connecting solar modules, make sure that the voltage specified by the man-
ufacturer corresponds to the actual measured voltage.
► Note the safety instructions and specifications of the solar module manufacturer re-
garding solar module grounding.
Connecting Alu-
minum Cables
The DC-side terminals are designed for connecting single-wire, round aluminum cables.
Due to the reaction of aluminum with air that creates a tough, non-conductive oxide layer
the following points must be considered when connecting aluminum cables:
- Reduced rated currents for aluminum cables
- The connection requirements listed below
Notice! Always follow the instructions of the cable manufacturer when using aluminum ca-
bles.
Notice! Take into account local specifications when configuring cable cross sections.
Connection Requirements:
Carefully clean off the oxide layer of the stripped end of the cable, e.g. using a knife
IMPORTANT! Do not use brushes, files, or sandpaper; aluminum particles may get stuck
and can transfer to other cables.
After removing the oxide layer of the cable end, rub in a neutral grease, e.g., acid-free
and alkali-free Vaseline
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 11,154 ft
.
(3000 to 3400 m
)
= 850 V
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