Solar Seer

A seer is someone who can predict the future.  In this case, the Solar Seer is 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.