To be able to charge it on the go just by leaving it in the sun?
In the book I am reading at the moment mentioned, the main guy, was trying to create a solar powered cellphone.
I wondered if it was possible or if it had already happened so I decided to google the possibility.
It turns out there have been trials by Nokia but it did not work very well.
Nokias commented
"When carefully positioned, the prototype phones were able, at best, to harvest enough energy to keep the phone on standby mode but with a very restricted amount of talk time. This means there’s still some way to go before a workable and care-free solution is achieved."
and
"The most substantial challenge is the limited size of a phone’s back cover, which restricts the extent to which the battery can be charged. What’s more, to ensure mobility, it is essential that the phone’s weather protection doesn’t cover the solar charging panel."
But you can by a Eton Mobius, which is a phone case, for an iPhone 4, with a battery and solar panel on the back. When the phone is inside the case, a 30-pin connector can draw power from the charged battery. When fully charged, the 1800mAh lithium ion battery provides five hours of talk time, or up to 32 hours of audio playback, Eton says. Depending on conditions, estimates have each hour of direct sunlight providing around 25 minutes of talk time.
Also the phone does not need to be in the case for the battery to charge. The case can be left in the sun while the phone is used elsewhere and you can just slip the phone in when you need a little more battery power. It will keep its charge if the power switch is left in the off position and an array of LEDs lets the user know that power is or is not being transferred to the phone.
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