PWM vs. TrakStar MPPT Technology

Traditional PWM vs Morningstar’s TrakStar™ MPPT Technology
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The Morningstar Name and the Morningstar Logo, TriStar MPPT, SunSaver MPPT, TriStar, MeterHub and TrakStar are all the trademarks of Morningstar Corporation. MODBUS and
MODBUS TCP/IP are trademarks of Modbus IDA. © 2013 Morningstar Corporation. All rights reserved.
Maximizing Efficiency:
Morningstar TrakStar™ MPPT controllers will operate at slightly different efficiencies depending
upon the nominal battery voltage being used, the Vmp of the array, and the total wattage of the
array. These efficiency curves are printed in the appropriate manual for every Morningstar MPPT
controller. This data can be used to optimally size your solar array for best performance and
maximum energy harvest.
NOTE: Morningstar offers a String Sizer tool to assist in the proper sizing/configuration of your solar array with
Morningstar controllers. Users may choose between a selection of pre‐populated module data or input their own module
specifications. This tool also allows for the adjustment of design parameters such as range of expected battery voltages
and min/max temperatures expected at the installation site. A link to the String Calculator can be found on the
Morningstar homepage: www.morningstarcorp.com
.
IMPORTANT: MPPT controllers can be used with off-grid or grid-tied modules. PWM controllers
should only be used with off-grid modules.