8
Before any manipulation at an installed PV plant, switch it of first on AC-side after on DC-side of the
inverter or the charge controller.
When disconnecting wires connected to a photovoltaic module that is exposed to light, an electric
arc may occur. Arcs can cause burns, start fires or otherwise create safety (up to lethal electric shock)
problems.
Check for remaining voltage before starting and observe the local safety relevant regulations for such
working conditions.
Under normal conditions, a photovoltaic module can produce more current and/or voltage (here:
30V DC) than reported at standard test conditions.
Contact with a DC voltage of 30 V or more is potentially hazardous. Exercise caution when wiring or
handling modules exposed to sunlight.
Only connect modules with the same rated output current in series. If modules are connected in
series, the total voltage is equal to the sum of the individual module voltages.
Only connect modules or series combinations of modules with the same voltage in parallel. If
modules are connected in parallel, the total current is equal to the sum of individual module or series
combination currents.
Always use the same type of module within a particular photovoltaic system.
If the sum of short circuit currents of the parallel connected modules passes over the reverse current
string diodes or fuses have to be used in each string of modules connected in parallel. These string
diodes or fuses have to be qualified for the maximum expected current and voltage. The fuse rating
value is also corresponding to the maximum reverse current that a module can withstand. The
reverse current value can be found on the product label, in the product datasheet or chapter 9 of
installation manual. Observe the instructions and safety precautions for all other components used
in the system, including wiring and cables, connectors, DC-breakers, inverters, etc.
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