Executive summary: put up more than 3.8 kW; it is easier ;-)
Colorado
~ 6000 HDD a year
? ~ 2000 CDD a year
Two person household
Marginal electricity on our local grid is coal, estimated to have 1 Kg CO2, 2 gram Nox and 2 gram Sox per kWh
NG Home boiler for DHW and radiant heat.
Annual PV production ~ 6700 kWh
I was limited by my landlord for a ground array and by my net meter arrangement with my utility had I chosen to put the array on the roof. The utility was kind enough to let me size to 120% of my estimated use with two EV cars
I generate ~ 1000 kWh a year PV electricity I do not use and send to the grid. That net generation offsets my much reduced NG consumption -- now that I have:
Colorado
~ 6000 HDD a year
? ~ 2000 CDD a year
Two person household
Marginal electricity on our local grid is coal, estimated to have 1 Kg CO2, 2 gram Nox and 2 gram Sox per kWh
NG Home boiler for DHW and radiant heat.
Annual PV production ~ 6700 kWh
I was limited by my landlord for a ground array and by my net meter arrangement with my utility had I chosen to put the array on the roof. The utility was kind enough to let me size to 120% of my estimated use with two EV cars
I generate ~ 1000 kWh a year PV electricity I do not use and send to the grid. That net generation offsets my much reduced NG consumption -- now that I have:
- changed to local person rather than multi-room heating
- and my wife has agreed to a lower flow shower head
- and is willing to limit showers to 10 minutes a go.
- and we are washing dishes more efficiently (specifically: I took over the duties.)
