fothermo PVB-30-AC Bedienungsanleitung Seite 14

EN
Connection of PV modules
IMPORTANT! The installation and electrical parallel
connection of PV modules may only be carried out
by a qualified person and may not endanger third
parties. When installing the photovoltaic modules,
the locally prevailing rules and laws must be com-
plied with.
IMPORTANT! Keep cables out of the way to avoid
tripping over them or getting caught. There is a risk
of injury. The cables must be fastened in such a way
that no tensile load is applied to the connectors.
Furthermore, it must be ruled out that the cables and
connectors rub against surfaces and edges (e.g. in
wind). The cables must not lie in water permanently.
IMPORTANT! Only photovoltaic modules with a
maximum of 60 resp. 120 cells and an open-circuit
voltage of 42,4 V may be connected.
• Photovoltaic modules must be connected cor-
rectly using the factory supplied MC4 plugs.
• You may connect up to five modules in parallel.
Depending on the module, this corresponds to
an MPP output of approximately 1 500 W ᵖ .
Dimensioning of the required photovoltaic power:
• The higher the number of hours of sunshine per
day, the smaller the required PV power.
• The warmer the water taken from the pipeline,
the lower the required PV power.
• Dimension the required photovoltaic power
according to the months with the lowest solar
radiation in which the photovoltaic water heater
will be in operation.
• The greater the amount of hot water consumed
per day, the larger the PV power required.
The following table serves as a guideline for dimen-
sioning the photovoltaic power needed depending
on the climatic conditions:
climatic
PVB-30-AC
conditions
countries
with low
sunshine e.g.
Northern
and Central
Europe
sunny count-
ries
e.g. Southern
Europe and
Africa
These values given are guidelines. Depending on
the conditions prevailing on site and the specific
conditions of consumption, the appropriate design
of the photovoltaic output may vary from the values
described.
Extension of the Photovoltaic Line
When extending the photovoltaic cable, the MC4
contact plugs must be properly attached to ensu-
re functionality and safety. Basically, the PV cable
should be kept as short as possible.
A length recommendation depending on the con-
nected nominal PV generator power can be found
in the following table.
Connected
PV power
~325 W ᵖ
~650 W ᵖ
~975 W ᵖ
Recommended cable length (there and back) for
different nominal powers and cross-sections
14
PVB-80-AC
600 W ᵖ 1 2 00 W ᵖ
300 W ᵖ 600 W ᵖ
4 mm² 6 mm²
≤ 18 m ≤ 27 m
≤ 11 m ≤ 16 m
≤ 9 m ≤ 13 m
10 mm²
≥ 27 m
≥ 16 m
≥ 13 m