So far I've generated about 1.5 megawatt hour from the system. According to the most polluting way of power generation by burning coal, I have stopped about 3000 pounds of carbon from entering the air.
Surprisingly even on cloudy days, it pulls about 900-1100 watts from the sun. The benefit from a more numerous panel set up is that not just the peak power produced during full sunlight but even during cloudy days you get more usable amounts produced.
1.5mwh would be about 20 recharges of a Tesla 85kwh model (there's a buffer of about 10kwh that never full discharges or charges). Considering I get 270 km in real world driving from a full charge/discharge, I could have travelled 5,400kms on that power with family and luggage lol
As for the power buy back, the wheels are creaking very slowly... I chased up with the installer the other day but still waiting for the inspection appointment. But hopefully within another few weeks. About the payment details, you have 2 options, to have credit going back to your CLP account. Or they will issue a check to the registered owner of the CLP account every month. I chose the cash option in case I leave HK and the buy back amount is over the actual consumed amount. With a 5kwh system I'm hoping even with full usage during the day there's some left over to fund my evening usages.