Specification Photovoltaic Panel - Viessmann Vitovolt 200 Technical Manual

2.1 Specification
PV generator current in V
MPP = Maximum power point
(maximum output) at STC
STC = Standard test conditions
The illustration shows three good curves
for a PV panel under different operating
conditions.
At the point at which the curves meet on
the Y−axis (PV generator current), the
current is at its strongest and the voltage
is nil. This maximum current strength is
referred to as a "short circuit current". It
is heavily dependent upon the irradiation
level.
The voltage is at its strongest at the point
at which the curves meet on the X−axis
(PV generator current), but the current is
nil. This is referred to as "idle voltage".
VITOVOLT
photovoltaic panel
MPP
MPP
MPP
The stated output of the PV panel is the
calculated value from the momentary
current and the voltage. These electrical
parameters are not fixed during
operation; they change according to
irradiation level and solar cell
temperature, recognisable by the
changing curves. The MPP control in the
inverter constantly looks for the operating
point on the curves, at which voltage and
current achieve their optimum values, i.e
at which the output is greatest.
No output is produced at either operating
points of "idle voltage" and "short circuit
current".
2.1 Specification
See the corresponding datasheet for
further details regarding the photovoltaic
panel.
photovoltaic panel
9