www.geyserwise.co.za
30
CONNECTION OF MPPT CONTROLLER
What is MPPT and how does it work?
MPPT stands for Maximum Power Point Tracking, and it relates to the solar cell itself. Each solar cell has a
point at which the current (I) and voltage (V) output from the cell result in the maximum power output of
the cell. In the diagram below the curve is an example of the standard output expected from a solar cell,
the Maximum Power Point is at the position marked on the diagram.
How is this done?
A Maximum Power Point Tracking solar regulator will simulate the load required by the solar panel to
achieve the maximum power from the cell. The regulator will work out at which point the cell will output
the maximum power and derive from this the voltage and current outputs required for maximum power
to be achieved. It will then calculate the load that it must simulate based on these voltage and current
levels R=V/I. The regulator, now receiving the maximum amount of power in, will then regulate the output
according to what it is designed for.
So in layman’s terms, how does MPPT benefit me?
MPPT ensures that you get the most power possible from your solar panels at any point in time. It is
particularly effective during low light level conditions. These calculations result in an output that delivers
maximum current at the required voltage at any point in time. During low light level situations it will
compensate for the low light level and find the new point at which the solar cell delivers its maximum
power output.
MPPT IV & PV curves
Volts
Maximum power point
W
atts
A
mps
PV System Installers Guide
___________
Connection of MPPT controller
