On Grid PV solar watrer takes the most leading technology in the world market.
When in sunny day, the solar panel can provide the power together with on grid electrcity power to provide to water chiller for start running, when it running stable, the water can running just with the power from solar panels if 4 panels, so it no need any electrcity at this time.
And when the water chiller stop running at sunny day, the solar panel can produce the power to return to electrcity grid,then it can let the power meter reverse,then save the electcity cost.
And when in cloudy day or night time, the air conditioner can automatic to switch to electrcity power.