PVsyst's forum

Welcome on PVsyst's forum.
It is currently Tue Jun 22, 2021 3:20 pm

All times are UTC+02:00

Post new topic  Reply to topic  [ 1 post ] 
Author Message
PostPosted: Mon Mar 30, 2015 4:44 pm 
User avatar

Joined: Mon Apr 16, 2012 7:29 pm
Posts: 1686
The installed nominal power (STC) is directly proportionnal to the collector area:

Pnom [kWp] = Coll. Area [m2] * Effic at STC [%] / 100

Now the Utilization Factor UF (= Acoll / Aground), which is the inverse of the Ground Coverage Ratio (GCR), is calculated according to:
File comment: Utilization Factor
Sheds_Definition_Calcul.png [ 9.24 KiB | Viewed 8427 times ]
We can notice that the more relevant parameter is the collector tilt: with 30° tilt you can install only 40-50% of the available ground area, when with 4° or less you can install more than 80% of your ground area.
This is very weakly dependent on your limit angle.
File comment: UF as function of collector tilt
Sheds_Utilization_Ratio.png [ 7.52 KiB | Viewed 8427 times ]
Therefore when the area is limited, you are always advised to put your collectors as horizontal as possible (with the only limit of the soiling problems).
Moreover, this results in much simpler support's mechanics, less wind sensitivity, lower weight, etc.
This allows also to define higher shed's width, i.e. more strings in the width of the shed. This drastically limits the electrical shadings losses.
In most cases, taking the shading effects into account, the overall energy loss will be less than 2-3% with respect to 20-30° sheds.

Display posts from previous:  Sort by  
Post new topic  Reply to topic  [ 1 post ] 

All times are UTC+02:00

You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
Powered by phpBB® Forum Software © phpBB Limited