7
Operational safety
Please observe all safety signs installed and all warnings laid out in the accompanying operating instructions.
Shut-down procedure
The following procedure must be followed to shut down the system, Please refer to the system drawings on page
13):
1. Disconnect the utility grid system to the inverter via AC Grid Disconnection Circuit Breaker labelled Q1.
2. Disconnect the DC power to the inverter at the DC side of the inverter via Grid Disconnection Circuit
Breaker – labelled Q2.
3. Disconnect the DC power to the Building DC cable on the roof via the Roof Isolating Circuit Breaker (if
applicable) – labelled Q3.
4. Disconnect all MC plugs between all solar modules to create lower voltage for a safe work environment.
DC voltage when system is shut down
Even if the system has been disconnected from the grid via a circuit-breaker, voltage is still present in the solar
panels during daylight hours.
In case of fire try and and shut down the system as far as possible. All circuit breakers must remain off until the fire
is extinguished.
Do not touch electric components such as wires, connection terminals, generator
junction boxes or plug connectors – there is a risk of electric shock or even
death.
Daylight voltage in the solar modules
In daylight hours, as well as at dusk and dawn, DC voltage will be present in the connected wires and cables.
Safe work on roofs
After shutting down your system in the order above, if persons are working on your roof, you must make them
aware that there is the possibility of a small, non-lethal electrical charge being present in the base frame and
module frames.
Cleaning the solar array
Depending on the roof slope, the solar panels clean themselves during rainy weather. However, a layer of dust can
form if there is a prolonged dry spell. This could reduce the amount of energy produced by the solar power system.
Your system output has been calculated to take account of this dust. We do NOT recommend that you climb on
the roof to clean the solar panels. Please do not use ANY high-pressure cleaner or chemical cleaning product on
the surface of the solar panels – use plain water at mains pressure or less. All electric components, such as cables,
connectors, generator junction boxes etc. must remain dry.
CAUTION: Never wash the solar panels while they are hot! Cold water on hot solar panels may cause the glass to
shatter. Note that solar panels may be hot even when it is cloudy; and that the temperature of the solar panel can
be up to 20°C higher than the site ambient temperature.
Do not open the inverter!
Never open the inverter housing, even when switched off. The inverter should only
be opened by a licensed electrician.
