The myths of solar debunked: Part 2

The myths of solar debunked: Part 2

JULY, 14 2011
HEIDI IHRKE
HIGH NOON SOLAR
569 S. WESTGATE DR. #4
GRAND JUNCTION, CO 81505
970-241-0209
WWW.HIGHNOONSOLAR.COM
The myths on solar continue being refuted this week in part 2 of a 3-part series. Our next article will focus specifically on financial myths associated with solar.

MYTH #1 Solar needs to be installed at a weird angle on my roof.

This myth, once again, had some past truth to it but isn't relevant for most of today's installations. Solar hot water panels were usually installed at a 54-degree angle to optimize winter solar gain, when the sun is low in the sky. This is because solar hot water panels cannot store heat on an annual basis, just on a daily basis, so the angle is put at the one required for winter heating, a high angle and one that required the panels being lifted away from the roof.

Solar electric panels work in a much different way since the utility grid can store excess power generated. The optimum angle for solar electric panels, on an annual basis in Grand Junction, is 30-39 degrees, depending on your information source. However, installing panels flush to the roof (the most common roof angle around the Grand Valley is about 20 degrees) only loses 4% production annually. This can be accounted for when designing the system, leaving the end product working as expected and not looking like an eyesore.

MYTH #2 Solar has to be installed facing south.

This one may get an initial rising of eyebrows from the “solar purists,” but it relates strongly to the last myth.

First, due to declination in Colorado, the perfect orientation for solar panels is actually right around 10 degrees east of south. That aside, many people don't have south facing roofs or, if they do, they may be very shaded. Should these people just get disqualified from solar or get a system that is lifted at a strange angle to the roof? Of course not.

Solar can be mounted to the east, southeast, south, southwest or west roofs. Efficiency loss to mount a system directly east-facing versus south is around 14%; for west the loss is 18%. A good designer will simply make up for this by adding another panel or two to the array that, ultimately, will allow the system to produce the same amount of annual power as the south-facing solar system.

MYTH #3 The power that goes into manufacturing a solar electric panel never actually gets made up by the energy it, in turn, produces.

This one is easy because there are a lot of studies on the subject. The term we are talking about here is Energy Payback Time (EPBT) or how long it takes for a solar panel to make more electricity than what went into creating it.

This term is used in all energy production techniques and is something that gets reviewed heavily by investors and developers for technologies such as oil shale. If you have to use more energy to get a product than that product then makes, why do it? Each solar panel has a different EPBT, due to different techniques in manufacturing, but for SunPower high efficiency 72 cell modules, the payback is 1.4- 3.8 years, depending on global location of installation.

MYTH #4 Climate change isn't real.

OK, this one isn't a specific solar myth but being active in the renewable energy field means I should address it nonetheless.

Perhaps it will mean a letter to the editor from someone who has learned “facts” from individuals paid by the industries dependent on folks believing global warming is a hoax to keep their bottom line secured, but that's the way that goes.

You think we would have learned a thing or two when this happened 50 years ago with tobacco companies after data revealed a link between smoking and lung disease. The tobacco industry just hired actors that were dressed up as doctors who gave advice that the reports were false. Nothing to see here; keep smoking away.

Ninety-eight percent (yes, that many) of climate scientists throughout the world have reached consensus that global climate change is happening. When 98% of medical doctors tell me not to do something because it will kill me, I listen to them. They are the experts, not the actors dressed up like them.

Nine of the 10 hottest years in history have occurred in the last 13 years. Watch the evening news to get regular updates on this situation, including all the “freak” numbers of tornadoes, mega-floods, droughts, wildfires, and hurricanes. The Arctic ice cap reached its record low volume last year. Climate change is real and, as Al Gore puts it: “Wishful thinking and denial lead to dead ends.”


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