Our house would be net zero source energy but…
– well filters: we avg 54 KWh / month
– well pump: 10 Kwh / month
– radon fan: 40 KWh / month
– 2 home offices: 60 KWh / month
– Mitsubishi minisplit: 20 Kwh / month (EVEN WHEN OFF DUE TO A COIL HEATER THINGY!)
– electric lawn mower: (not much, but just sayin’)
What else did I forget?
So that’s 54+10+40+60+20 = 184 KWh / month
= 2208 / KWh per year
… that we can’t help that some other net-zero types of house don’t have since our house has a well and 2 home offices and a mitsubishi mr slim air-source heat pump with what I would consider a design flaw!
We use approximately 10,000 KWh per year for everything (heat, hot water, lighting, cooking, etc.) And our 6.9 KW PV panels make about 8,400 KWh so if we didn’t have the extra 2200 KWh, we’d be easily net zero.
BUT… then there is driving. Someone who lives in a city in and walks everywhere is blowing us away. We drive maybe 15000 miles per year at 20 MPG (minivan). There goes net-zero.