Solar Power Generation Calculator
Solar panels are growing in popularity in Austin as we have many sunny days as well as significant rebates from Austin Energy.
This question often comes up when I visit homes with buyers. “Does this home have good potential for solar power generation?” Obviously there are several factors:
- Roof size, angle, and orientation
- Roof shading from nearby trees and structures
- Deed restrictions
- Available rebates
Items 2 – 4 can be quickly determined. However, calculating the solar power generation potential is a bit more complicated as it depends on the area, angle, and orientation of the roof (Item #1 above). Of course the path of the sun changes through the year, which should also be taken into account for proper estimation.
Sounds like a fun exercise right? Well, if you’d rather avoid the calculation there is a handy website that will take care of it for you. Check it out: www.roofray.com
With this website all you have to do is find the home on Google Maps and draw the area where the solar panel array would be installed. You then set the orientation and angle and Roofray does the rest. Here is an example:
With this information the website can calculate your monthly power generation:
As well as generate a cost-benefit analysis based on your average utility bill and the utility rates for your area. Here is the break even calculation from my sample report (unfortunately they don’t include our rebate program):
If you’re considering solar, check it out!



