Solar panels replaced tarmac on a motorway — here are the results

Solar panels replaced tarmac on a motorway — here are the results

Four years ago a viral campaign wooed the world with a promise of fighting climate change and jump-starting the economy by replacing tarmac on the world's roads with solar panels. The bold idea has undergone some road testing since then. The first results from preliminary studies have recently come out, and they're a bit underwhelming.

A solar panel lying under a road is at a number of disadvantages. As it's not at the optimum tilt angle, it's going to produce less power and it's going to be more prone to shading, which is a problem as shade over just 5% of the surface of a panel can reduce power generation by 50%.

The panels are also likely to be covered by dirt and dust, and would need far thicker glass than conventional panels to withstand the weight of traffic, which will further limit the light they absorb.

Unable to benefit from air circulation, its inevitable these panels will heat up more than a rooftop solar panel too. For every 1°C over optimum temperature you lose 0.5% of energy efficiency.

As a result a significant drop in performance for a solar road, compared to rooftop solar panels, has to be expected. The question is by how much and what is the economic cost?

Some interesting perspectives obtained from the various tests. Yes, right now this is probably still not the most practical way of doing it using current technology. Seems right now that rooftop solar will yield greater power generation. But I'm sure experimentation will still continue and improve.

Read more at https://phys.org/news/2018-09-solar-panels-tarmac-motorwayhere-results.html

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Solar panels replaced tarmac on a motorway—here are the results
Four years ago a viral campaign wooed the world with a promise of fighting climate change and jump-starting the economy by replacing tarmac on the world's roads with solar panels. The bold idea has undergone some road testing since then. The first results from preliminary studies have recently come out, and they're a bit underwhelming.

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