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Compass Marine How To | all galleries >> Welcome To >> MPPT vs. PWM Controllers > Results
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The weather for this testing could not have been worse but it is real world. I did not stop the testing for rain, fog or clouds because real weather happens and I wanted realistic data. The data is what it is, and simply represents Maine in the spring... Despite the lousy weather MPPT beat PWM every single day charging the 400Ah LiFePO4 battery.

MPPT Ah's 7 Day Total = 220.44

PWM Ah's 7 Day Total = 182.48

Percentage Gain For MPPT = 20.8% Boost

The results are pretty clear but are only representative of this particular testing. Solar performance can vary widely and the results seen here may not be what you will see on your boat. Temperature, conditions, panel locations, batteries, wiring etc. can all play a roll. On average I regularly see & measure 10-20% gains on lead acid and saw almost 21% in this test.

Despite early spring weather in Maine the MPPT controller bested the PWM controller netting a nearly 21% gain over the 7 test days. conditions.

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