Panel Size increases Required as you move away from South

[groberts]

Just setting out on my first install and wanted to know if anybody can help with a panel sizing question. I have a small airing cupboard so we are limited to a 144ltr twin coil, I was going to connect this to a 20 Tube 47mm panel. However my roof is ESE but at a low pitch of 30 degrees. How much should I increase the panel size to offset the orientation. I was reluctant to place another panel on the other slope as this would be WNW.

Also I was hoping to leave half the roof for a possible future PV system which would limit the panel to a 20 tube 58mm panel. A 30 tube 47mm would be a bit wide. Any ideas whether the 20 tube 58mm would be enough or should I dump the PV and go for a larger panel. (I know it depends on use, young family 2 and 0.8 years old) 

Any advice would be appreciated.

Gavin

[Brandon]

ESE is a wee bit too far east to be ideal, usually I would do either 30*47 or 20*58 on 150l, so you will probably get by, but your afternoons will be weak, You are indeed right not to bother with the WNW.

[mick]

Gavin,

Brandon is, as always, correct re:number of tubes - especially as roof is ESE. But Navi does other sizes - could you fit  2x10 x 58mm panels one above t'other? or 2x15 x 47? in order to leave reasonable area for PV?

Assuming you have a basic two plane roof, one ESE and one WNW, you must have a SSW gable end wall. Is it large enough to put the panel on? Windows, shading, etc, need considering but a steep angle (say 15^o off wall (i.e. 75^o from horizontal) will catch more of the winter sun and slightly even out seasonal fluctuation - and SSW is a better orientation.

Mick.