Micro inverter efficiency wave explanation
Tags: inverter, Micro inverter
Addressing "point d", CEC efficiency testing is conducted by an independent test laboratory, according to a protocol established by the Sandia National Laboratory. Here is a link to a webpage where you can download the test standard.
Addressing "point a" (and part of "point c"), I believe the test protocol has specific requirements around power factor and harmonic distortion. Please refer to the link above for that info.
Addressing "point b", the test of power conversion efficiency does not include MPPT efficiency, though I agree that this is equally important. In fact, this is why Enphase publishes MPPT efficiency on its product datasheet.
Addressing "point c", the M215's efficiency remains very high at low power levels thanks to a patented technology called "burst-mode". This technology enables Enphase Micro inverters to cycle on and off and to interleave power stages at very high speeds (on the scale of micro-seconds), in order to optimize the power conversion efficiency all the way down to a fraction of a watt. And, your reaction to these efficiency numbers shows just how innovative and unique burst-mode technology is-- it's something that doesn't exist in any other inverter (or microinverter), and is one of the (many) things that makes Enphase the efficiency leader in micro inverters.
Addressing "point e", I'm not sure where your temperature information came from. We have operating temperature information published on the M215 product datasheet.
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