During the past 31 days the house consumed 1810 kWh and produced only 152 kWh. OUCH!
Our total consumption to date (since October 18) is 3986 kWh, with total production at 724 kWh. Since our total annual consumption budget is 8000 kWh, we’ve burned through 50% of our electricity budget.
Sounds pretty bad right? The game isn’t over just yet. We’ve just come through three of the four darkest months of the year. By February 15, we will be getting as many sunshine hours as we do on October 27. Plus, last year we virtually stopped heating the house as of the second week of February (due to a sunny, mild month).
So we are still in the ballpark, but we will definitely need some luck for this to be a net zero energy year.
Some numbers and observations:
Net Power Consumption: 945 kWh
Total Production (PV Modules): 107 kWh
Net Power Consumption: 865 kWh
Total Production (PV Modules): 45 kWh
We had a net zero day on January 6:
The negative values represent production (as in, negative consumption).
With Google PowerMeter, you can really see the thermal inertia that builds up in the concrete slabs:
Very little heat was needed until the latter half of the day on January 7. After the sunny day of January 6, the concrete in the house retained heat for quite a while.