Panels on North East side

[jason121]

Any comments on attaching panels via 35 degree incline facing an azimuth of 250 degrees for extra output

 

[FB.]

I wouldn't have a problem with NorthWest or NorthEast panels. A distant relative of mine has North-facing 30-degree panels as part of a split N/S 2+2kW array and their array is performing well.

I'd be less sure of those on the "A frames" due to shading. I'd rather set the panels flat to the roof, and double-up the number of panels due to not needing spaces between the A-frames. Extra panels being particularly useful on cloudy days when it doesn't make much difference which way panels face.
From memory, the N/S split has the North panels running only a little less than the South panels on cloudy days. Something like 80-85% comes to mind.

 

[jason121]

This is were the idea came from

 

[jason121]

I wouldn't have a problem with NorthWest or NorthEast panels. A distant relative of mine has North-facing 30-degree panels as part of a split N/S 2+2kW array and their array is performing well.

I'd be less sure of those on the "A frames" due to shading. I'd rather set the panels flat to the roof, and double-up the number of panels due to not needing spaces between the A-frames. Extra panels being particularly useful on cloudy days when it doesn't make much difference which way panels face.
From memory, the N/S split has the North panels running only a little less than the South panels on cloudy days. Something like 80-85% comes to mind.

This design is to top up the 40kw which will fill the other two roofs, so only can install 10kw on the North east side

 

[FB.]

View attachment 16863
This is were the idea came from

I would weigh-up the expected difference in cost and generation of the A-frame vs flat to the North-facing roof.
It may well be that a full-roof of NE-facing at 20-degrees has a higher initial cost, but also a higher return on investment because of no need for frames and economies of scale (e.g. scaffold and paperwork is a relatively fixed price no matter how big or small the system).

The 2kW North + 2kW South had a slightly higher ROI (output v cost; 11.5% ROI for 2+2kWp N/S split and 11% ROI for 3kWp South) and considerably higher total generation (2800kWh v 2400kWh) than 3kW South, when the total payback and total outlays were compared.

 

[SolarCity]

What pitch is the roof currently? You may find that you don't really need the pitched frames to get a decent enough output - have you simulated it?

 

[finchy]

Schletter do a rail that you can use to lift one edge more the the other by a few degrees...have a look at their site! Cheaper than frames.

 

[jason121]

Calculated the figures. By adding an extra 1kw from the other roof (which was 120 % load ) giving 11kw on a 10kw inverter, there is no need for A frames so less cost.
So thanks guys all of you were correct