Path-Q Solar
How should a shared roof be assessed when one owner's section receives substantially more sunlight?
Answer
Assess the roof as separate solar zones, quantify each zone's production potential, and agree in advance how costs, equipment, production, maintenance, and roof responsibilities will be allocated. The best arrangement may not be an equal panel count or equal use of roof area.
Key points
- Model orientation, tilt, shading, usable area, and electrical losses for each owner's section.
- Compare physical allocation with alternatives such as shared ownership, separate systems, or a common system with an agreed allocation method.
- Account for the fact that production and electricity consumption may differ between owners.
What it depends on
- Ownership and control of each roof section
- Solar access and shading by section
- Each owner's load, meter arrangement, and desired allocation
- Structural condition and access requirements
- Written agreement on costs, repairs, insurance, and roof replacement
Risks and trade-offs
- Equal roof area does not necessarily produce equal energy or value.
- A shared system can reduce duplication but increases coordination and dispute risk.
- Giving the sunnier section more equipment may require a different cost or benefit allocation.
Information you may need
- Roof survey and shade analysis by section
- Ownership and access documents
- Electricity-use data for each owner
- Preferred cost, production, and maintenance allocation
Your next step
What to do next
Request separate production estimates for each roof zone and compare them with at least one shared-system allocation proposal.
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