Roof face direction

A south-facing face makes the most power in Los Angeles, west-facing faces help most in the evening, north-facing ones the least. That’s why the direction of every face feeds straight into the calculation.

Where it comes from

When you close a face, Cali-Graf measures which way it slopes from Google’s height data. When the measurement is close to square with one side of the face, the arrow lines up with that side — shown in yellow — so it isn’t off by a degree or two. The face’s settings show the direction as a compass point and degrees, like S · 179°, and the list on the right shows it for every face.

If the face couldn’t be measured, you’ll see Not measured: the arrow follows the longest side — check it.

Check and fix it

1. Select the face

   Pick Select (S) and click the face. Look at the arrow on the roof: it should point down the slope.

2. Turn the arrow if it’s wrong

   Next side moves the arrow to the next side of the face. Reverse turns it around, when the roof slopes the other way.

3. Go back to the measurement if needed

   After a change by hand, Reset returns the arrow to the direction from Google heights.