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Author Topic: shaded roof vs unshaded flat roof  (Read 1281 times)
BrodieBoy
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« on: May 01, 2007, 10:36:42 AM »

Hi all,

I have a choice between mounting my planned panel on an unshaded flat roof on an A-frame; or a south-south-west facing roof which (today on May 1st) is unshaded until 3.00pm but then the main roof casts a solid shadow over it.

Having read this excellent board i am aware of the potential problems of mounting a panel on a flat roof (i.e. it might blow away!) so it would be safest to mount it on the roof. However, the roof does not get as much sun.

What do people think? If i dont get any sun on the panel after 3pm (at this time of year) how much performance have i lost? Instinct tells me that the main solar energy will be available from between 10am and 3pm but i have no info to back this up. Have any dataloggers gathered any info on daylight hours vs solar energy available?

Many thanks,

BrodieBoy.
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O MidKnight
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« Reply #1 on: May 01, 2007, 11:29:59 AM »

Hi BrodieBoy

Go for the flat roof. Make sure mountings are secure and roof in A1 condition. Wire tensioning ropes can sometimes be used to help secure panel frames. Vacuum tubes are a better bet for flat roofs too as less wind ressistance.
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