Sunlight consists of two components, the direct beam which carries 90% of the solar energy and the diffuse sunlight which carries the remainder, as most of the energy is located in the direct beam, maximizing the collection required the sun to be visible as much time as possible.

Sun travels through 360 degrees east-west a day, and for a fixed location the visible portion is about 180 degrees during 12 hours period, due to local horizon effect; the effective motion is about 150 degrees.

The energy contributed by the direct beam drops off, by the cosine of the angle of incidence (angle between incoming light and panel).

Angle i

Losses = 1- cos (i)

Angle i

Losses = 1- cos (i)

0 °

0 %



1 °




3 °




8 °




23.4 °




For a fixed orientation panel, between the dawn and the sunset extremes will witness a motion of 75 degrees on either side, and thus according to table below, will lose around 75% of the energy throughout the day, a tracker rotation from east to west can help recapture these energy losses.

Solar tracking systems are used for orienting the solar panel toward the sun with a very high degree of accuracy.

Figure 1 single axis solar tracking

Figure 2 Solar panel alignment

200 MW Tranquility solar project begins operation in California

Monday, 26 September 2016 17:56

The huge utility-scale site was developed by Canadian Solar subsidiary Recurrent Energy and is majority owned by U.S. utility Southern Power, representing a rare new PV development of this scale in the U.S. as the trend shifts away from such large solar constructions.

Verengo Solar files for bankruptcy, will sell solar assets to Crius Energy

Monday, 26 September 2016 17:39

Using Section 363 of Chapter 11 bankruptcy laws, the troubled California solar installer hopes to regain its position as a major installer in California as well as expand nationally.

TerraForm Power, Global in talks with SunEdison over more than $3 billion in claims

Monday, 26 September 2016 17:18

The two yieldcos are hoping to resolve suits with their sponsor, while they look for buyers.

Solar helping to protect Myanmar village from poisonous snakes

Monday, 26 September 2016 15:52

Panasonic has installed its off-grid solar plus storage Power Supply Station in the village of Yin Ma Chaung, Myanmar, which supplies street lights in an area with poisonous snakes, allowing villages to now move around at night.