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a) What kind of a load was used, will these inverters have such a high efficiency with inductive (refrigerators, washing machines) or diode-capacitive one (TV sets, computers, monitors etc) load or they just mean very rare nowadays pure resistive load? b) Does this efficiency include efficiency of its MPPT or it is just an inverter efficiency?
c) In some cases such a high efficiency is achievable by reducing waveform quality cause the output capacitor takes some energy to recharge 120 times per second and an output coil also has its resistance, what about waveforms quality in the whole range of loads? Such a plain curve in case of Enphase M215-60-2LL (95-96% efficiency in a load range 10-100%) makes me to suspect they have a reduced output filter, but Powercom SLK-1500 looks more (85-96% efficiency with load range 10-100%) realistic - all right, a good output filter reduces efficiency in case of small loads.
d) by the way - who made all these measurements? The problem is that most of contemporary digital voltmeters and ampermeters give wrong results with non-sine voltage and current measurements, so the better filter - the worst efficiency will be shown. In some cases (Tom Bearden's MEG) they ever show "over-unity!"
e) Why the Enphase M215-60-2LL results are actual just for 25-40 Centigrades? What if somebody installs them at the roof, will it have these 25-40 Centigrades?
So still - SOME of micro inverters PROBABLY have claimed 96% efficiency in SOME conditions, no more.