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Panel efficiency at STC

Andrea B. · 2024-01-02 07:24:24

Can't find the answer to this one. Looking at panel spec sheets and working back dimensions, some things aren't adding up. I use a manufacturer's Wpeak, and work back to STC and reference standard of 1000W/msq. I get efficiency results of around 30%. But yet, the manufacturer has lower efficiency claims of around 20%? I…

02-01-2024 7:24am

#1

Andrea B.

Registered Users, Registered Users 2 Posts: 1,988 ✭✭✭

Join Date: January 2007

Posts: 1884

Can't find the answer to this one.
Looking at panel spec sheets and working back dimensions, some things aren't adding up.
I use a manufacturer's Wpeak, and work back to STC and reference standard of 1000W/msq.
I get efficiency results of around 30%.
But yet, the manufacturer has lower efficiency claims of around 20%?
I can post example later when on PC, but it just isn't adding up for me...

0

Comments

#2 02-01-2024 8:12am

graememk

Moderators, Home & Garden Moderators Posts: 6,637 Mod ✭✭✭✭

Join Date: January 2008

Posts: 6624

Panels are roughly 1.7m x 1.1 = 1.87
At 1000w/m2, for a 400w panel,
400/1.87/1000 = 0.213, or 21.3%

2