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I need a charger and battery for a cell phone booster. - Page 2

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Posted by philkryder on October 23, 2009, 6:10 am

seems I need to provide more data.

we are in zip code 93105 - about latitude 34degrees.

since we are up in the mountains at 3500 feet, we avoid much of the
local coastal overcast.

is there an easy way to obtain better data as to the "solar resource

Posted by ghio on October 23, 2009, 12:03 pm


Posted by Ron Rosenfeld on October 23, 2009, 12:24 pm
 On Thu, 22 Oct 2009 23:10:59 -0700 (PDT), philkryder

Do a search for PVWATTS.  It is a NREL provided program that has a lot of
locations programmed in.

It seems Santa Maria is the closest place for which there is specific data,
but there may be more data at PVWATTS2.

A quick glance suggests that, with your panels laying flat, you will not be
producing enough power during Jan; but you would be OK if they were
oriented at 50.

Posted by ghio on October 24, 2009, 3:23 am
"Researchers at the National Renewable Energy Laboratory developed
PVWatts to permit non-experts to quickly obtain performance estimates
for grid-connected PV systems."

Says it all really, "Non Experts" and "performance estimates" for grid-
connected PV systems.

Of course the system in question is not grid connected and estimates
are just a guess.

If you want a system based on a guess for grid connected systems then

OTOH, if you want to design a stand alone system based on real data
then  "http://eosweb.larc.nasa.gov/sse/  " is the better option.

Posted by philkryder on October 24, 2009, 7:08 am
I put in my 34.421 and 119.71 and got a grid bounded by 34 35 and 119

Which seemed to show a low point of 2.67 "Monthly Averaged Insolation
Incident On A Horizontal Surface (kWh/m2/day)"

Given all the micro-climates in our mountains and along the coast, how
useful is the NASA data based on a one degree grid?

I note HOMER says a "12 meter" elevation - but we are at about 1100
meters or so...

So, can I assume that the NASA data is likely to be WORSE due to
coastal cloud cover effects and low altitude?

How much does solar improve with increased altitude?

In any event, how do I come up with a solar capacity and battery
capacity based on the above?

thanks for your help.

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