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Figure 31. PV system startup steps.
Figure 32. Steps for the string disconnection from the inverter
3.
4.
5. PV SYSTEM COMMISSIONING
5.1.
Connect a PV system
The system start up must only be performed by a qualified technician.
To start up the PV system one should proceed as follows:
1 – Assure that the inverter is not damaged due to shipping;
2 - Check the voltage of the PV generator in open circuit. This should not
exceed the maximum admissible DC input voltage of the inverter;
3 – Connect the positive terminal of the string to the positive string input
of the inverter. Connect the negative terminal of the string to the negative
string input of the inverter. CHECK THE POLARITY!!!
4 – Not used DC plug connectors should be sealed with the proper sea-
ling plugs;
5 – Check the correct connection of the AC cable to the inverter;
6 – Close the built in DC switch in the inverter;
7 – Connect the AC circuit turning on the breaker on the PV electric box;
8 – Check the display, to see if the inverter is in function mode, or if it is
giving any kind of error.
(Figure 31)
Never disconnect the inverter from the PV installation before iso-
lating from the AC voltage (on the electric box, open the breaker).
5.2.
Disconnect the PV system
Any works carried out on the PV system must only be done by a qualified
technician.
To disconnect the inverter from the PV generator, follow the procedures:
1 – Turn off breaker on the AC electric Box;
2 – Turn of breaker on the DC inverter;
3 – Disconnect strings from the inverter.
(Figure 32)
5.3.
Security notes
PV modules produce electricity when exposed to daylight and individual
modules cannot be switched off. Hence, unlike most other electrical ins-
tallation work, the electrical installation of a PV system typically involves
working on a live system. See requirements of Regulation 14 of Electri-
city at Work Regulations 1989.
PV presents a unique combination of hazard – due to risk of shock, falling
and other simultaneous manual handling difficulty. All of these hazards
are encountered as a matter of course on a building site, but rarely all at
once. While roofers may be accustomed to minimising risks of falling or
injury due to manual handling problems, they may not be used to dealing
with the risk of electric shock. Similarly, electricians would be familiar
with electric shock hazards but will not be used to handling large objects
at heights.
21
Solargen solar PV
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