On 5/28/2013 8:03 PM, Michael Graff wrote:
> What I'd like to do is find a LiPo charger with 3.3 V DC output, a solar =
input, and as an option an external DC supply.  As I live in Oklahoma, I th=
ink the biggest problems are keeping the LiPo in the proper temperature ran=
ge, not a supply of sunlight.  However, I'd obviously like to keep things p=
lunking along all night.

Whenever I see projects for outdoors that need temperature stability I=20
think one thing, bury it.
Buy a short length of 3-4" PVC drain pipe, 1 end cap,  1 clean out fitting.
Place one cap on the pipe and bury the pipe vertically.
Drill a hole near the end of the pipe nearest the surface for wiring =20
and seal with silicone.
Put project in pipe and screw on clean out.

You now have a project enclosure that is temp stable and water proof for=20
outdoors too. There is a site where you can find out what depth you will=20
need to reach the standard of 50f/10c , most places is about 2 feet.
http://www.wcc.nrcs.usda.gov/scan/

Mark H.

--=20
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