SMP100 Manual

5
For example, a Mitsubishi PV-MLE270HD module has an Open Circuit Voltage of 38.4 volts at
25C, but at -25C, the Voc rises to 120% or 46.08 volts. Dividing 230 by 46.08 gives a result of 5,
so 5 of these panels can be wired in Series for 1350 watts per string, and then as many strings
in parallel as will produce the maximum output power at the nominal battery voltage as shown
in the table below.
The charging of batteries from a solar array is enhanced by the use of a patented MPPT control
design as explained in detail below.
MPPT Maximum Power Point Tracking
MPPT enables the SolarMax Charge Controller to utilize the maximum power available from
the PV array. A solar panel has a variable power output. Power is measured in watts and is
the product of the voltage multiplied by the current. The SolarMax constantly searches for this
maximum power point, using a patented MPPT algorithm, to ensure that you get the maximum
power output for charging the batteries.
Maximum Power Point Tracker
MPPT Power from the PV array (green) and the Current vs. Voltage (blue)