Data Collection Test Site Results

Since Solar Road Panels must be laid flat, unlike rooftop solar, we are collecting data at different latitudes to compare the difference in energy harvesting. We take regular store-bought solar panels and angle one to the south at the optimal angle for that latitude and place the other flat.

In April of 2015, a collection site was installed in southern Arizona at the Biosphere 2 in Oracle, Arizona. A second site was set up at Solar Roadways in Sagle, Idaho in August 2015. A third site was set up at the Missouri DOT Transportation Research Center in Chesterfield, Missouri in March 2016.

The Sagle, ID site uses 220W solar panels and the Oracle, AZ and Chesterfield, MO sites use 250W solar panels.

As can be seen from the data collected so far, the flat panels generate more energy than the tilted panels during overcast days. We believe this is because the photons are scattered on overcast days, and during such times, it is easier for them to land on a flat surface than one which is angled.

"Snow" indicates months where no data was collected because the panels were covered in snow and collected zero solar energy. Keep in mind that Solar Roadways will collect solar energy in every kind of weather as the panels will never be covered in snow thanks to our heating elements.

We are comparing the energy generated from solar panels laid flat (as they will be for Solar Roadways installations) vs energy generated from panels angled for each given latitude the way it's done for solar farms or rooftop panels. The data thus far is surpassing our expectations.

Each of these Data Collection Sites will soon receive a complimentary SR3 panel to diplay to thank them for their participation in this program. We are currently considering two more data collection sites: one below the 32 degrees N latitude and the other above the 49 degrees N latitude. They should be high visibility areas with an open southern exposure.

Test site at MoDOT

Location	Oracle, AZ		Chesterfield, MO		Sagle, ID
Latitude	32?34’47.38” N		38?38’27.81” N		48?13’49.38” N
Micro-inverter #	2452 (flat panel)	2369 (angled panel)	2276 (flat panel)	1951 (angled panel)	6270 (flat panel)	6277 (angled panel)
2015 May	44.1 kWh	44.1 kWh	-	-	-	-
2015 Jun	41.2 kWh	39.9 kWh	-	-	-	-
2015 Jul	35.3 kWh	34.4 kWh	-	-	-	-
2015 Aug	36.6 kWh	37.8 kWh	-	-	-	-
2015 Sep	30.2 kWh	34.3 kWh	-	-	20.5 kWh	26.0 kWh
2015 Oct	27.1 kWh	33.8 kWh	-	-	13.4 kWh	20.6 kWh
2015 Nov	24.4 kWh	35.5 kWh	-	-	snow	snow
2015 Dec	19.7 kWh	29.7 kWh	-	-	snow	snow
2016 Jan	22.1 kWh	32.3 kWh	-	-	snow	snow
2016 Feb	28.7 kWh	39.3 kWh	-	-	snow	snow
2016 Mar	35.8 kWh	43.8 kWh	16.0 kWh	17.8 kWh	15.9 kWh	18.8 kWh
2016 Apr	40.0 kWh	42.9 kWh	28.4 kWh	26.4 kWh	26.8 kWh	30.3 kWh
2016 May	45.8 kWh	47.1 kWh	27.4 kWh	17.9 kWh	33.5 kWh	30.7 kWh