Effect of roof angle and orientation on solar What's the ideal roof angle for solar? And what's the effect of facing East / West / South on the annual generation?

What's the best roof angle an orientation for solar here in Ireland?

The angle, and orientation, of your roof does make a difference to it's potential to general solar electricity for you.

Here we've made some simple solar calculators for you so you can adjust both the orientation and angle of your roof, and see how that effect the annual generation from solar.

All figures here are calculated based on a typical solar installation here in Ireland.

Effect of orientation on solar panel output

This has a significant effect. Generally we advice only putting panels on roofs facing anything from East through South to West. Once you start pointing north the production per pv panel starts to drop off quite quickly. That said on a flatter roof you can get away with pointing a bit North.

Effect of roof angle on solar panel output