Solar modules are the core of a photovoltaic system and generate electrical current from sunshine. They are usually mounted on the roof of a house and therefore must be particularly resistant to environmental conditions and be able to withstand burden such as snow. Several types are available and their make and number will determine the output of the entire system.
How do solar panels produce electricity?
Photovoltaic modules (PV modules) convert sunlight into electrical energy. The solar cells inside each panels are responsible for this. They are protected on both sides by a pane of tempered glass and a plastic EVA film. The sun’s rays penetrate these two transparent layers to reach the solar cells.
Since an individual solar cell produces only a little electricity, several of them are combined per solar panel. Inside these cells is a layer with a surplus of positive charge carriers (p-layer) and a second layer with a surplus of negative charge carriers (n-layer). An internal electrical field builds up at the so-called p-n junction (the interface between the layers) which is normally made of silicon. This leads to a charge separation of the charge carriers released by the incidence of light. The electrical charge can be made usable via metal contacts. Direct current then flows if an electrical consumer is connected.
The right solar module for demand
With such a wide ranging selections available on the market, it can be difficult to select the right solar panel. The search for a suitable solar module can be aided by answering the following questions:
- What output should be achieved?
- What should the system look like?
- Should a roof-integrated or a rooftop system be installed?
- In which region will the system be built?
- What purpose will this system fulfill?
There are two basic types of solar cells used in modules production; monocrystalline and polycrystalline. All SOLARWATT Australia solar panels are made with monocrystalline cells which have an excellent efficiency of 16 to 20%. Though both cell types are particularly well suited to private use, polychrystalline cells have a lower efficiency range of 12 to 16%.
Glass-glass or glass-foil
Aside from how much power they can yield, resistance to environmental factors plays a big role in how solar modules perform. Glass-foil modules are a tradition construction with a pane of tempered glass facing up towards the sun, and a plastic foil composite on the backside of the panel. Glass-glass modules, however, are a double glass-pane style with tempered glass protection on both sides. Glass-glass modules are extremely weather resistant, very durable, and have a high yield reliability. Despite the additional glass pane, glass-glass modules are comparable in weight to traditional modules and are just as easy to assemble and install.
SOLARWATT QUALITY – PHOTOVOLTAIC SYSTEMS MADE IN DRESDEN
SOLARWATT glass-glass modules are more durable and resilient than any of their predecessors! The innovative glass-glass technology makes them virtually indestructible against all weather influences and stress (such as hailstones or dust storms) That’s why SOLARWATT can offer the best panel guarantees on the global market:
- 30-year performance guarantee
- 30-year product guarantee
The advantages of SOLARWATT glass-glass modules
They are virtually indestructible
SOLARWATT systems have gained recognition for their premium quality and glass-glass photovoltaic modules are an excellent example. In addition to required quality assurance tests, SOLARWATT solar modules are tested in real-world installation situations under diagonal loads. Asymmetric loads are applied thereby: in this way, for example, a higher compressive load is applied to the lower edge of the module to simulate snow sliding down.
They can withstand high mechanical loads
The modern glass-glass composite of the modules from SOLARWATT protects the solar cells optimally against mechanical stress. These modules are strong enough for grown adults to walk over without causing the slightest damage to the valuable solar cells inside.
They are extremely resistant to hail
The new generation of modern and high quality SOLARWATT modules are tested for resistance to hail. In the test, hailstones with a diameter of 25 mm strike the solar module at a speed of 83 km/h.
They are extremely resistant to salt spray
Thanks to the unique glass-glass laminate, the SOLARWATT solutions are even more resistant to extreme conditions such as salt spray. SOLARWATT solar modules exhibit neither electrical nor mechanical abnormalities after independent tests.
- 1,280 hours cyclic loading with temperatures from 23 to 40 °C
- relative humidity from 45 to 93%
- constant spraying with aggressive sodium chloride solution