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I need a charger and battery for a cell phone booster. - Page 10

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Posted by ghio on October 24, 2009, 11:56 am


Posted by philkryder on October 25, 2009, 8:48 am

Steve -

Thanks for mentioning the wild animals, Vandals and Weather extremes.

We don't have severe cold,
 but we do have high wind with gusts of 80 mph being not uncommon.

We recently got 10 inches of rain in 36 hours.

We also get fire ash from the brush/forest fires.

We have mountain lion, bear and assorted small chewing animals like
ground squirrels.

And, Vandals are a concern.
That was the reason I intended to lay the panels "flat" on top of a
shipping container, to avoid them being easily seen.

Are there anythings I could do to mitigate these risks cost

best wishes and thanks!

P.S. - what is a SolarMD? I associate the honorific term "MD" with
medicine. Is this some new form of board certification?

Posted by stevey on November 1, 2009, 4:13 pm
 Hi Phil,

Thanks for providing more detail.  I see you've got a committee going!
Ron's input was very helpful.
Assuming the booster requires constant power at 6Wdc, and the worst
day for Sunlight offering 2.55 hours of 80% full Sun, you'll need 1.56
the 45W assembly to get 144 Watt-hours of energy.  You may want to
buy two sets of the Harbor kits.  Hope the 9V output from the kit has
80% plus efficiency AND can charge 6V gel-cell batteries that can hold
120 WH of energy.  You'll need to find a 6.9V float charger, or my
linearBob may help you design  one DIY charger.
 You'll also need rigid structure to withstand perhaps 100MHP wind
and have bob-wire protection on top of the storage.  It is not a
trivial task
to build your racking for 6 panels with a slight tilt(10-15 degrees)
to drain off
dust and a gap  of 6" or more from the top of the storage box.

Good Luck,
P.S.  solarMD is an alias for marketing purpose invented by me--an EE
with Master degree and 5 years of involvement with solar power.
See www.wattminder.com, --it offers free benchmark calculator for
who can enter some essential parameters about a site; to help detect
under-performing installations.

Posted by philkryder on November 2, 2009, 9:14 am
Steve - thanks -

Why do I need the 6 inch gap?

Regarding mounting:
I'm hoping to block up one of the long edges of each panel so that I
have about a 19degree slope
By placing it on a 4 inch thick bit of pressure treated lumber.
By having it centered in the middle of the container, It will be 2.5
feet from each edge and will be minimally viewable from the ground
around the container.

I'm thinking that 90% or more of the time we will be using the 3 watt
minimum, so, hopefully our needs will be only half of your 6 watt

does that seem reasonable?

Thanks again.

Posted by stevey on November 7, 2009, 4:51 pm
 The 6" gap is needed if you lay the panel flat on top of the storage
box which heats
up under the Sun.  A gap allows air flow underneath the panel to cool
it down.
If you mount the panels at a tilt towards South or West, then the gap
may not be
needed at all if the tilt angle is large.
Good Luck,

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