energy per day from a 5KW system?

I am thinking seriously about installing a 5KW photovoltaic system.
It will be grid connected.
The area I live in averages 7.5 hours of sunshine per day (taken over a
100 year period.)

How much outpout in kilowatt-hours might I average per day, year round.

One reference says maybe 20kW-hours per day average over a year.

Can anyone suggest some links that might help answer the question?

On 13/02/2010 1:20 PM, Josepi wrote:
> Think again on the 7.5 hours. Useful time is typically 3-4 hours unless you
> gonna' track the sun.
>
> Check sun chart calculators for real figures.
>
> Is this a waste money project?
>
>
> "Harry B"<(E-Mail Removed)> wrote in message
> news:4b75d990$(E-Mail Removed)...
> I am thinking seriously about installing a 5KW photovoltaic system.
> It will be grid connected.
> The area I live in averages 7.5 hours of sunshine per day (taken over a
> 100 year period.)
>
> How much outpout in kilowatt-hours might I average per day, year round.
>
> One reference says maybe 20kW-hours per day average over a year.
>
> Can anyone suggest some links that might help answer the question?
>
>

Is this a waste money project?
Good question.
Where I live the government is providing a huge incentive.
The incentive is a gross feed in tariff at 3 times the retail price of a
kWh unit.

Why do you say useful time is typically 3-4 hours as opposed to say 4-5
hours or 2-3 hours?

On 13/02/2010 3:01 PM, Mike Brown wrote:
> I have a 5KW system located in Paso Robles, California, halfway
> between San Francisco and Los Angeles. I've written an application
> that show the production data for every day the system has been in
> operation. Just go to the site and click on the app's screen image.
> If you have a recent version of Java installed, the app will launch
> and you can explore daily, weekly, yearly and lifetime data. Go to
> the Custom Day tab and check the data for June 21 and December 21 and
> you can see the shortest and longest power-generating days of the year
> (although December is normally cloudy and rainy). My system peaks
> around 35 KWH in the summer and drops to about 22 KWH on a clear day
> in the winter. Let me know if you have any questions. I work for a
> solar power company and can probably get you more in-depth data if you
> need it. We use the PVWatts system from NREL among other tools to
> predict our system's power output: http://rredc.nrel.gov/solar/codes_al...ATTS/version2/
>
> http://www.mike-land.com/Solar_Power/solar_power.html
>
> Mike Brown
>
>
> On Feb 12, 2:43 pm, Harry B<har...@bharry.com> wrote:
>> I am thinking seriously about installing a 5KW photovoltaic system.
>> It will be grid connected.
>> The area I live in averages 7.5 hours of sunshine per day (taken over a
>> 100 year period.)
>>
>> How much outpout in kilowatt-hours might I average per day, year round.
>>
>> One reference says maybe 20kW-hours per day average over a year.
>>
>> Can anyone suggest some links that might help answer the question?
>

Wow. You have some great info on this site. Congratulations.
I am trying to work out some of the scales on your graphs as to whether
you are talking gross or net, ow why your cumulative meter readings over
a year can have dips in them.
I will look more closely at a later stage.

Josepi <J.R.M.@invaliid.con> wrote:
> Think again on the 7.5 hours. Useful time is typically 3-4 hours unless you
> gonna' track the sun.

Saying that typical sun time is 3-4 hours is no more reasonable than saying
it is 7.5 hours, unless there is a geographical reference supplied.

Someone else mentioned PVWatts version 2, but I prefer Version 1
http://rredc.nrel.gov/solar/codes_al...ATTS/version1/
Predicted solar energy available, based on real observation points around
the US and the world.

For my installation:
PVWatts for a nearby station, 4500 DC, 84%, 26 tilt, 214 az, 15.3 cents.
(kWh/m2/day) (kWh) ($)
Year 5.42 6777 1036.88
021506-021507 actual 6751 generated, 99.6% of NREL prediction.

http://cdold.home.mchsi.com/Solar-generation.htm $1775 avoided in 2008

--
Clarence A Dold - Hidden Valley Lake, CA, USA GPS: 38.8,-122.5

<"stevey" <(E-Mail Removed)> a écrit dans le message de news:
<Sun for PV purposes, i.e. if you multiply your system's DC capacity 5
<(KW) by
<5(hour) and by 360 (days) = 9000 KWh. of AC KWh of energy, over a
<year.
<Good Luck,
<-Steve

.... NOT so sure:

Here (France), you get roughly 1100 kWh/ year for 1kWc, for 100% (optimal)
setting.
(average)

Look, for example:
http://www.elecosolaire.fr/index.php...1&limitstart=1

You'll surely find the same for the US

HIH
JM

spdx <(E-Mail Removed)> wrote:
> > On Feb 12, 2:43 pm, Harry B <har...@bharry.com> wrote:
> >> I am thinking seriously about installing a 5KW photovoltaic system.
> >> It will be grid connected.
> >> The area I live in averages 7.5 hours of sunshine per day (taken over a
> >> 100 year period.)
> >>
> >> How much outpout in kilowatt-hours might I average per day, year round.
> >>
> >> Can anyone suggest some links that might help answer the question?

http://cdold.home.mchsi.com/Solar-generation.htm $1,897 avoided in 2009

In 2009, I had 4152 hours of run time, producing 6746 kWh on a 4500 Watt DC
3800 Watt AC system. PVWatts nearby says 5.39 kWh/m2/day for my panel
location, tilt and azimuth. South/38.8 would be 5.5 kWh/m2/day.

http://rredc.nrel.gov/solar/codes_al...ATTS/version1/
Predicted solar energy available, based on real observation points around
the US and the world.

--
Clarence A Dold - Hidden Valley Lake, CA, USA GPS: 38.8,-122.5

<(E-Mail Removed)> a écrit dans le message de
news:hvmvvk$nmq$(E-Mail Removed)...
>
> http://rredc.nrel.gov/solar/codes_al...ATTS/version1/
> Predicted solar energy available, based on real observation points around
> the US and the world.

http://www.nrel.gov/rredc/pvwatts/

http://www.nrel.gov/rredc/pvwatts/version1.html

Jean-Marc <(E-Mail Removed)> wrote:

> <(E-Mail Removed)> a C)crit dans le message de
> news:hvmvvk$nmq$(E-Mail Removed)...
> >
> > http://rredc.nrel.gov/solar/codes_al...ATTS/version1/
> > Predicted solar energy available, based on real observation points around
> > the US and the world.

> http://www.nrel.gov/rredc/pvwatts/

> http://www.nrel.gov/rredc/pvwatts/version1.html

I usually try to hit URLs to make sure they are still good before I post
them, but I didn't expect a government site to move ;-(


--
Clarence A Dold - Hidden Valley Lake, CA, USA GPS: 38.8,-122.5