A seer is someone who can predict the future. In this case, the Solar Seer is PVWatts (http://www.nrel.gov/rredc/pvwatts/), a program that calculates how much power a photovoltaic energy system will generate. When I crunched the numbers back when our solar carport was commissioned, PVWatts predicted our system would generate slightly more power than we typically use in a year (106% more to be precise, see post below).
With 2013 over, I looked over the numbers.
Our solar carport generated 5,306 kWh (5.3 megawatt hr) in 2013.
This is 105% more power than we used in 2013 (we used 5,045 kWh). PVWatts was thus dead on when it came to predicting power production.
So there are two take home messages: 1) By going solar, we’ve now eliminated our electricity footprint on this earth (at least with respect to our home electricity usage). 2) PVWatts is amazing. Believe what it tells you.