Rural property owners put systems on the roof of their house or shop – or on the ground in their yard. Most residential homeowners in Ontario put solar panels on their roof.
Thus, these systems are more efficient and have better lifetime IRRs and NPVs.They are more efficiency because they can be easily placed to the optimal direction (south), the optimal angle (~45°), and to avoid shading.These systems are more expensive upfront due to piling, mounting, and trenching requirements.If you’re putting solar panels on the ground, you should know that: You may need to replace your shingles (or entire roof) before installing – because panels are guaranteed for 25 years!.A south facing roof is best, east and west facing are good, but north is not great.If you’re putting solar panels on your roof, you should know that: You would do the above calculation and determine that you need 515sqft of space to install your system! Let’s continue from the previous section and assume that you need a 8.58kW system. (average size of panel = 0.3kW, average physical panel size = 18sqft) Physical space required = size of system needed (in kW) / size of panel (in kW) * physical size of panel (in sqft) The equation to calculate the space that your solar system require is again simple:
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