Dulas Solar VC150, Handbook

Page: 58 / 156

58
5.3
How to measure direction
The only practical method to measure direction of the array with sufficient accuracy
is with a compass. The procedure is as follows:
1. Place the cardboard or wooden template, which you used to check the tilt of the
array on the surface of a module so that it is parallel to the sloping sides of the
module and so that the angle on the template, which is equal to the latitude, points
away from the equator.
2. Place the compass horizontally on the top edge of the template.
3. The magnetic needle on the compass should point along the line of the edge of
the template if the array slopes (faces) towards the equator, as it should. Also note
that:
-
The magnetic needle will point down the slope of the panel. If your refrigerator
is installed in the southern hemisphere.
- The magnetic needle will point up the slope of the panel If your refrigerator is
installation is in the Northern hemisphere.
4. The direction of the array on lt needs to be positioned to within an accuracy of
about 10
0
based on measurements with a compass.