There may be a number of reasons for this:
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It takes 8-10 hours to fully charge a Solio from the sun. With peak charging times between 10am and 2pm, it takes a minimum of 2 days to fully charge a Solio.
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Placing Solio behind a glass window will also reduce the amount of energy absorbed by the solar panels.
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Any shadow on part of one or more of the panels will reduce the performance of Solio.
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For the solar panels to perform at their peak they need to be in direct sunlight and perpendicular to the sun, this requires adjustments to your Solio as the sun moves through sky.
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Clouds, pollution and higher latitudes will have a negative impact on Solio's performance. Please see http://www.solio.com/v2/support/solar-intensity.html
Solio has a built in "fuel gauge" that measures the amount of charge within its own internal battery. The level of charge within Solio is indicated when the start button is pressed. Once the button is pressed, a green light will flash between 1 and 4 times. 4 flashes indicates a full charge, 3 flashes about a 75% charge, 2 flashes for 50% and 1 flash for a 25% charge. However, as with other devices that use a lithium ion battery, the indicator is only a rough estimate in determining the state of charge. For example, although Solio may show 2 flashes after it has been left in the sun for several hours, it may in fact be 70% charged, which is more than enough to power a cell phone or iPod.
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