[pct-l] Phone Charging

[Ron Graybill]

If these light weight Mini-Power batteries make it to the market they may
be just the thing for hikers.  They have already won a design award:
http://www.red-dot.sg/en/online-exhibition/concept/?code=1269&y=2014&c=17&a=0
See also:
http://gajitz.com/emergency-power-paper-micro-batteries-for-mobile-phones/

Ronald D. Graybill
11832 Fordham Place
Riverside, CA  92505
rgraybill44 at gmail.com
909-910-9339

On Mon, Feb 2, 2015 at 11:43 AM, Ed Jarrett <edjarrett at msn.com> wrote:

> I used a Suntatics panel last August in the North Cascades, and it worked
> well, even later in the day.  Obviously it would do better further south
> and at noon, but it was far from useless.
>
> Ed Jarrett (Eeyore)A Clay Jar: http://aclayjar.blogspot.com/  Twitter:
> https://twitter.com/EdJarrett53 Facebook:
> https://www.facebook.com/ed.jarrett.71
>
> > From: rbelshee at hotmail.com
> > To: pct-l at backcountry.net
> > Date: Mon, 2 Feb 2015 11:24:45 -0800
> > Subject: Re: [pct-l] Phone Charging
> >
> > > All things being equal, with only temperature as a variable , solar
> output
> > > is greater when temperature is colder.
> > > So what is the basis that your output might be greater in summer?
> >
> > More radiant solar energy is available per square foot in summer time.
> There
> > are fancy graphs of solar radiant energy available, but here are a few
> > basics relevant to the PCT thru-hiker:
> > - peak at solar noon (sun highest in sky), majority of energy is in a
> window
> > just a few hours each side of solar noon)
> > - strongest at summer solstice, weakest at winter solstice (early May to
> > early Sep is good)
> > - stronger in the south, weaker in the north
> > - diminished by clouds (full sun is obviously best, though I have been
> able
> > to charge a little on lightly cloudy days)
> > - open view to sky required (duh)
> >
> > Because of the last four on the list, chargers in Washington are useless,
> > and in most of Oregon they are dubious. But they are great for the first
> > 1700-1800 miles, especially when you take a siesta in the heat of the
> day in
> > southern California and can charge up rapidly.
> >
> > Aligning to the sun is also a variable. The available radiation at a 45
> > degree angle is about 70% of that when aligned perfectly, and actual
> panels
> > tend to perform a bit worse than that.  Best to keep within 30 degrees,
> > where close to 90% of the maximum radiation is available.
> >
> > So, you are right that all things being equal, cold temperature is
> better.
> > But unfortunately in solar calculation all things are never equal.
> >
> > -- Steady
> >
> >
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