Step 5: Last word
Based on very unscientific empirical result, having use this phone for more than a week without ever charging the battery, roughly an extension of 25~50% of normal usage and anticipating every occasion there's sunlight hoping this thing gets a juice. Success!
Although circumstances differ, on reflection it is very liberating and the idea certainly does work, not cost-effective but that's wasn't the point to moot. Certainly useful for a out and about camper.
How can it be improved?
Interestingly Texas Instrument has a boost converter, TPS61200, that works down to 0.3V providing a regulated output up to 5V. This particular chip is well-sited solar powered applications, anyone interested may well explore further.
http://focus.ti.com/docs/prod/folders/print/tps61200.html
I would assume since a solar panel is augmenting the battery, its dimension could be halved (e.g. using a lithium polymer battery commonly used by RC hobbyist), doubling up real estate for additional circuitry.
Have fun!
Although circumstances differ, on reflection it is very liberating and the idea certainly does work, not cost-effective but that's wasn't the point to moot. Certainly useful for a out and about camper.
How can it be improved?
Interestingly Texas Instrument has a boost converter, TPS61200, that works down to 0.3V providing a regulated output up to 5V. This particular chip is well-sited solar powered applications, anyone interested may well explore further.
http://focus.ti.com/docs/prod/folders/print/tps61200.html
I would assume since a solar panel is augmenting the battery, its dimension could be halved (e.g. using a lithium polymer battery commonly used by RC hobbyist), doubling up real estate for additional circuitry.
Have fun!
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