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In page Renewable energy in Asia:

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A typical 'solar home system' can power two to eight 'low energy' lights, plus a socket for TV, radio or battery recharging, and a mobile telephone charging unit, too. Each system consists of a solar photovoltaic panel, mounted on the house roof. Depending on its size, this provides between 40W and 135W of electricity in full sunlight (the most common being 50W).[citation needed]