Unwashed Solar Panels Can Drop to 32.4% of Capacity

Just a followup on the 200,000 liters of water to clean solar panels post.

NREL actually tested panels in Qatar with different cleaning schedules.

A 35,000 m2 Solar Test Facility was established at Qatar Foundation, Doha, in 2012 in order to identify solar energy technologies suitable for the local climate, and study the effects of dust and heat. Of particular concern is soiling of PV panels, causing them to lose performance. This study aims to understand long-term soiling behavior in the absence of cleaning or rain.


Four PV arrays were set up at the Solar Test Facility. Each comprised eight polycrystalline  PV modules, connected to identical grid-tied inverters, and operated at maximum power point conditions.

The only difference between the arrays was the cleaning interval:

(i) one week (“high”), (ii) two months (“medium”), (iii) six months (“low”), and (iv) not  cleaned (“never”).

Of course, all arrays were subject to rain. The test period was two years commenced February 2013.

Energy losses of each array due to soiling are shown in Figure 1. The results are expressed as the arrays‟ PR relative to the long-term average PR of the weekly-washed array, ie. the weekly-washed array is treated as the “100%” benchmark. It is seen that:

• The soiling rates generally appear to be higher in winter than in summer, ie. The lines are steepest in the months around January-February, and relatively flat around June-July.

The greatest power loss occurred on the never-washed array, which after 234 days
produced only 32.4% of the DC power of the weekly-washed array

• The soiling rate tends to decrease the longer the time since last cleaning, as seen by
comparing the slopes of the medium, low and never-washed arrays approaching
November 2014
• However dust continued to accumulate on the never-washed array even after 234 days, ie. The line was still going down when it rained in November 2014.


Japan Will Need To Dispose of 110,000 Solar Panels per Day!

A mess of panels.

TOKYO —  Solar panels have sprung up across Japan in the past few years, after the government introduced a “feed-in tariff” in July 2012 that guarantees prices for electricity generated from renewable energy. When these panels reach the end of their working lives in 20-30 years, they will create a mountain of waste.


By 2020, Japan’s Environment Ministry forecasts the country’s solar-panel waste will exceed 10,000 tons.

After that, the pile really starts growing: reaching 100,000 tons in 2031 and topping 300,000 tons in 2033, the 20th anniversary of the feed-in tariff.

Between 2034 and 2040 the amount of waste produced is expected to hover around 700,000-800,000 tons annually.

The projected peak of 810,000 tons is equivalent to 40.5 million panels.

To dispose of that amount in a year would mean getting rid of 110,000 panels per day.



10 Hours of Sun in Germany for December 2017

At NoTricksZone the insanity of Germany’s “plan” for saving the worlds from cheap electrcity is on display.

80GW of demand (the reddish line)

40 GW of installed solar producing almost nothing (the yellow)/

10 hours of sunshine in Germany for the whole month of December.



As Jo Nova says:

“Imagine what kind of havoc this kind of energy flux can do. Not one piece of baseload capital equipment can be retired, despite the fact that half of it is randomly unprofitable depending on cloud cover. Solar PV eats away the low cost competitive advantage. Capital sits there unused, spinning on standby, while wages, interest, and other costs keep accruing. So hapless baseload suppliers charge more for the hours that they do run, making electricity more expensive.

They just need batteries with three months supply.”


Solar Array UHI = PVHI = 3C to 4C

Do you have a lot of solar cells in your neighborhood or city or state? Then welcome to the PVHI.

“Because there are still large uncertainties surrounding the potential for a PHVI effect, we examined the PVHI empirically with experiments that spanned three biomes. We found temperatures over a PV plant were regularly 3–4 °C warmer than wildlands at night, which is in direct contrast to other studies based on models that suggested that PV systems should decrease ambient temperatures.”

And then your region can buy more air conditioners to try and cool off the evening, which will then pump more warm moist air into the area, which will increase the night time temperatures even more and then ….




The wisps of smoke are birds/insects being immolated by the Ivanpah solar farm.


A macabre fireworks show unfolds each day along I-15 west of Las Vegas, as birds fly into concentrated beams of sunlight and are instantly incinerated, leaving wisps of white smoke against the blue desert sky.

Workers at the Ivanpah Solar Plant have a name for the spectacle: “Streamers.”

Federal biologists say about 6,000 birds die from collisions or immolation annually while chasing flying insects around the facility’s three 40-story towers, which catch sunlight from five square miles of garage-door-size mirrors to drive the plant’s power-producing turbines.

Coyotes are getting fat on Roadrunners.

In addition, coyotes eat dozens of road runners trapped  along the outside of a perimeter fence that was designed to prevent federally threatened desert tortoises from wandering onto the property.