Classic Product Page
The lines on the graph represent the Classic output
current at different Max Power Points Voltage (not
VOC). To estimate the Max Power Point of your system;
first you have to find out the VOC of the Photovoltaic
strings connected to the Classic. For example If 5
Modules in series in one string and STC VOC rating
is 36.6V, then the VOC of the string equals: 5(modules)
* 36.6v(STC VOC) = 183V.
The rule of thumb says that the MPP will be around
80% of the string's VOC; 183v * 0.8 = 146.4v On the
graph of the Classic model you have, the X axis represents
the Battery Voltage and the Y axis is the Output current.
Knowing that, go to the corresponding graph and look
for the a line close to your system's MPP voltage
and you can then determine the max output power for
your system design.