Area of a solar panel

[Daggs]

How big are solar panels in area?  Anyone have a spreadsheet or link that relates wattage to area?  Thanks.

[Daggs]

Here's the reason I'm asking.....

I hectare = 2.5 acres, roughly.  How manykilowatt hours would this bank produce?

Someone check my math for me....

Raw sunlight hits the earth at about 1.38kw/square meter.  I hectare = 10,000 square meters.  Efficiency of a solar cell in turning raw sunlight to electricity is .20 (??).  1 hectare of solar cells gives about .767kwhs of power.

Multiply this by the average suntime per day, and the number of sunny days per year for Albuquerque (where I live) and I get....

.767 x 10 x 300 = 2300kwh per year.

Does that sound right?

[Nando]

A more practical values

Solar Insolation ~ 1.0 KW/m^2

2. 47 acres = 1 hectare = 10,000 M^2
   
10000. KW * 6 hours *0.17 efficiency = 10.2 MWH/ day
       
10. 2 * 365 days /year = - you do the calculation.
    
    

Nando

[Nando]

correcting display

[new] Re: Area of a solar panel (3.00 / 0) (#3)

by Nando (nando37-at-comcast-dot-net) on Thu Apr 6th, 2006 at 03:00:23 PM MST

(User Info)  

A more practical values

Solar Insolation ~ 1.0 KW/m^2

~~~ 2.47 acres = 1 hectare = 10,000 M^2

~~~ 10,000 KW * 6 hours 0.17 efficiency = 1.02 MWH/ day

~~~ 1.02 MWH 365 days /year = - you do the calculation.

Nando

[ghurd]

First, why confuse measurements? 1KW is usually used as the peak solar insolation for a square meter.

What the heck is a hectometer?  

Yea, I do know, but 'hectare' (1km^2) and 'solar' are not found on any chart I've ever seen.

Next, there are 3 main types of solar electric panel. Somewhere around 7%, 15% and 17%.  Amorphous, multi/poly crystaline, single/mono crystaline.

Get into NASA type stuff and it could go 40+%.

Now get into wasted area. Space between cells. Space between areas. Etc.

Then heat/temp. etc.

It would be best to use the manufacturer's specs and work backwards.

Mono is best, multi is a close 2nd, amorph is a far 3rd (and won't last as long).

[antw]

I thought a hectare was 10,000 m2, not 1 km2 which is 1,000,000 m2 ?

I think the reason why a hectare was used was because a lot of people purchase rural land by the hectare outside the USA.

[ghurd]

Metric / english.  English / metric.

Ten thousand square meters.  Ten thousand meters squared. Million. Billion. Whatever. My bad.

Ever heard of a solar panel being sold as a 0.000074132 acre panel?

Is that a US-32 or a GEPV-55M?

How many amps will a 0.000074132 acre panel put into a 12V battey at full sun?

How many amps will a 0.000074200 acre panel make?

If you kow what I mean.

[Nando]

CORRECTING AGAIN AND AGAIN AND AGAIN

I do not know how my mind changed the values AGAIN -- OLD AGE I WOULD SAY !!!

A more practical values

Assuming a perfect panel surface of 10,000 square meters with a Solar insolation of 1 KW/M^2

Solar Insolation ~ 1.0 KW/m^2

A general insolation time would be around 6 hours, some say 8 hours, some 10 hours.

The efficiency of most panels are running around 17 %

~~~ 2.47 acres = 1 hectare = 10,000 M^2

~~~ 10,000 KW * 6 hours 0.17 efficiency = 10.2 MWH/ day

~~~ 10.2 MWH * 365 days /year = 3723 MWH-YEAR

A better power calculations would be to leave the daily hours for last and calculate the basic 1 hour.

10,000 M^2 * 1.0 KW/m^2 * 1 hour * 365 days *0.17 EFF = 620,500 KWH year with one (1) hour solar exposure = 620.5 MWH-YEAR PER HOUR OF INSOLATION

So if the insolation time is 10 hours the power would be 6205 MWH year

If the insolation time is 5 hours then 3650 * 5 = 3102.5 MWH year

Nando