1.       adopt DC power, then the solar power, wind power can directiy supply the machine

2.       adopt low voltage power drive all the eiectric parts, compressor driven by special CUP,infinite variable speed, hight efficiency, rotating speed automatically adjusted according to temperature.

3.       adopt solar and wind priority,when solar or wind is enough, then use solar or wind power. On the other hand, possible to use other electric to supply.