Photovoltaic sizing and Insolation 1

[pamungkas]

dear all,
I am reading BP sphoto voltaic specification BP380 and found at note 1 about STC (standard Tes condition). it is said that STC is conducted in 1000 W/m2 and cell temp 25 dec C to get warranty output 75 W. Efficiency is 0.12.

If in area, the insolation is 4.5 kW/m2/day and daylight hours is 12 hours. Does it means the average of irradiance is 4500/12 W/m2 (375 W/m2)? Then the actual net output is 375/1000 x 75W (28.125 W)?

Thank you for your enlightment.

 

[itsmoked]

"(375 W/m2)?"

I'd agree.



1200mm x 530mm = 0.636m²

375W/m² x 0.636m² x 0.12 = 28.6W
Seem to agree.

It's probably a lousy idea to make those Average generalizations though.

Keith Cress
kcress -

http://www.flaminsystems.com

 

[pamungkas]

Thank you Itsmoked.

 

[alehman]

Another way to look at is on an average day you get 75W x 4.5 hrs/day = 338 WH/day.

The BP380 is rated 80W, so you might get a little more. Don't forget to account for losses like voltage drop and inverter efficiency.

Alan
----
"It’s always fun to do the impossible." - Walt Disney

 

[rcw retired EE]

Also account for any loss of efficiency due to the angle of the solar panel to the sun in your mounting/aiming arrangement and account for different operating temperatures. I believe BP's 75W number is under standard "ideal" conditions.