TrakStar MPPT Technology and Maximum Input Power

Morningstar’s TrakStar™ MPPT Technology & Maximum Input Power
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On cloudy (or intermittent sunny) days there will be little or no power-shaving and the extra power will serve the
battery well with more energy harvest. This graph uses real array data and is scaled to a 200W module and a
240W module.
 On this day there is < 1% loss due to power-shaving (energy above the red line), so more than 95% of the
excess power over 200W can be utilized for charging.
 On clear days this loss of power is likely not to be missed so much.
 One exception to note is where the power-shaving energy loss could be more of a factor—in colder
climates with winter tilt.
o In these conditions (shorter days, colder temperatures and okay ≈90° incidence angles) the array
will operate above STC Max.
o Power Levels and the loss of power could have a bigger impact during the time of the year when
it is most needed.
 Also, to avoid unnecessary stress on the controller’s electronic components, it is recommended that when
the controller is installed in a sustained warm temperature climate, the controller not operate at full
power, close to its maximum ambient temperature, for prolonged periods of time.
SS-MPPT-15L (240W vs. 200W module) on an Intermittent Day