20
Notes on DC Connection
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).
- Note the temperature coefficients in the solar module data sheet.
- More exact data for sizing the solar modules can be obtained using calculation tools
such as the Fronius Configuration Tool (available at http://www.solarweb.com).
- See NEC table 690.7 for the appropriate code-related voltage adjustment factor for
crystalline silicon modules, or use the manufacturer’s specified voltage coefficient.
Inverter DC Con-
nection
The inverter is designed exclusively to be
connected and used with nongrounded so-
lar modules.
The solar modules cannot be grounded at
either the positive or negative pole.
IMPORTANT! Check the polarity and voltage of the solar module strings.
If DC cables are laid over the shaft of the
DC main switch, or across the DC main
switch connection block, they could be da-
maged when the inverter swivels in, or the
inverter could be prevented from swiveling
in.
IMPORTANT! Do not lay the DC cable over
the DC main switch or across the DC main
switch connection block.
Multi MPP Track-
er Inverter – Fro-
nius Primo 3.0–
8.2
Multi MPP Tracker inverters have 2 independent DC inputs (MPP Tracker). These inputs
can be connected to a number of different modules.
Each MPP Tracker has 2 DC+ terminals. There are a total of 4 DC- terminals.
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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