Energy

June 17, 2012

Solar Modules

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Photovoltaic solar panels use solar power cells to convert light from the sun straight into electricity. At Innovative Solar Solutions, we carry and stock almost all of the top brands, including Sharpened Solar, Kyocera Solar, BP Solar, Evergreen Solar, Solar World, Kaneka, Uni-Solar, Suntech, Sanyo, Day4 and OEM Solar modules.

The 3 most typical kinds of solar modules are Mono crystal, Polycrystalline, and Amorphous :

Mono crystalline solar modules – made of a single enormous crystal, cut from strips. It is the best but also the most expensive. It is kind of better in low lighting scenarios.

Polycrystalline solar modules – cast blocks of silicon that might contain many little crystals is the most typical type right now. A little less efficient than single crystal, but once set into a frame with 35 or so other cells, the actual difference in watts per square foot isn’t much.

Amorphous solar modules ( also called thin film ) – the silicon is spread at once on giant plates or flexible laminates. They are less expensive to supply, but frequently a lot less efficient, that means bigger panels for a similar power. Uni-Solar is one example. The differences between the 2 solar modules – crystal-like and amorphous- truly show up in their sunlight-to-electricity conversion efficiencies and power densities. Crystal modules require less space than thin-film modules for the same quantity of powerthin-film is less efficient in the conversion of daylight to electricity.

Single- and multi crystalline solar modules have characteristic conversion efficiencies between 12% and 17%. But thin-film technologies can have half that, starting from 6% to 8%. Thin film modules take up about two times as much space to generate an equivalent amount of energy compared to crystalline modules.

Besides power density, there are two major differences in performance between solar modules crystal-like and thin-film technologies. The 1st is impact of cell temperature on power production. The 2nd is 1st module power stabilization.

All PV solar modules experience a decrease in power with a rise in cell temperature. For instance, at 100F, our sample crystalline module will produce roughly 6% less power than its STC rating. This effect is less pronounced for thin-film PV technologiesour example a-Si thin-film module would produce only 2 percent less power. While you can reduce cell temperature by allowing sufficient air circulation around any module, PV cells sitting out in the sunshine will still get hotso thin-film a-Si modules might be a good selection for warm climates, especially if there’s plenty of room for the bigger array.

Amorphous silicon solar modules take six to twelve months to reach their stable, rated output, whereas crystal modules stabilize immediately. So a-Si solar modules will show twenty p.c. to 25% higher-than-rated production at first. While that sounds a bit like a bonus, this 1st further output must be considered in system design ( for selecting wire sizes, charge controllers, and inverters ). As an example, if the final design indicates a 15 A circuit, the original extra output might require accommodating 20 A. After this stabilisation, thin-film solar modules degrade at similar rates to crystal, about 0.5% to 1.0% each year.

Find out what ELSE you may not know about photovoltaic efficiency by joining us on our website: http://photovoltaicefficiency.info/

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