New PV system (dormer windows)

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Hi all,
I recently moved house and whilst my roof faces more or less directly south, I wanted to ask about anyone's experience with dormer windows, how much is lost because of the shade that they cast over the roof....my last house had 16 panels which were 1.65m x 1m and I'm thinking at best I could get would be maybe 12 onto this roof because I have a velux window and 2 dormer windows. The panels that I had before were rated to 285w (I think, since the whole system was rated to 4.56Kw) so the other thing that I wondered is whether there are panels available now which can generate significantly more power for a similar surface area?
TIA
I recently moved house and whilst my roof faces more or less directly south, I wanted to ask about anyone's experience with dormer windows, how much is lost because of the shade that they cast over the roof....my last house had 16 panels which were 1.65m x 1m and I'm thinking at best I could get would be maybe 12 onto this roof because I have a velux window and 2 dormer windows. The panels that I had before were rated to 285w (I think, since the whole system was rated to 4.56Kw) so the other thing that I wondered is whether there are panels available now which can generate significantly more power for a similar surface area?
TIA
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2.72kWp PV facing SSW installed Jan 2012. 11 x 247w panels, 2.5kw inverter. 28MWh generated, long-term average 2.6 Os.
Anyway, I see that from that table there are panels which are just over 1m x 1.75m ish it's hard to judge how many panels of that size I could be able to fit but I would think at least 12 which would get me over 4Kw....
2.72kWp PV facing SSW installed Jan 2012. 11 x 247w panels, 2.5kw inverter. 28MWh generated, long-term average 2.6 Os.
I'm hoping AES can give me a competitive quote as they are a local company only about 20 miles from me.