Notes On Dc Connection; General Information About Solar Modules; Inverter Dc Connection - Fronius Galvo 208-240 1.5-1 Operating Instructions Manual

Notes on DC Connection

General Informa- In order to select suitable solar modules and get the most efficient use out of the inverter,
tion about Solar please note the following points:
Modules -
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-
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Inverter DC Con- IMPORTANT! Check the polarity and voltage of the solar module strings. The difference
nection between the individual solar module strings may not exceed 10 V.
The open circuit voltage of the solar modules increases as the temperature decreases
(assuming constant irradiance). The open circuit voltage must not exceed the follow-
ing values depending on the altitude:
0–6561 ft. (0–2000 m) ... UDC max = 550 V
> 6561–8202 ft. (> 2000–2500 m) ... UDC max = 540 V
> 8202–9842 ft. (> 2500–3000 m) ... UDC max = 480 V
> 9842 –11482 ft. (> 3000–3500 m) ... UDC max = 430 V
Open circuit voltage which exceeds the given values will damage the inverter and void
all warranty entitlements.
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.
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.
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.
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