Path-Q Solar
For the same total solar capacity, how do installation costs compare between one large array and smaller arrays spread across several buildings?
Answer
One large array is often simpler and less costly per unit of capacity, while several smaller arrays commonly cost more because each building may require separate mounting, wiring, access, disconnects, design work, and coordination; the actual result depends on site conditions.
Key points
- Shared mobilization, equipment, and electrical infrastructure can favor a single array.
- Distributed arrays may use otherwise unusable roof space or improve orientation and shade performance.
- Each building can introduce separate structural, roof, access, and interconnection requirements.
What it depends on
- Building count, distances, and roof conditions
- Array orientations, shading, and structural capacity
- Electrical service arrangements and cable routes
- Equipment distribution and monitoring architecture
Risks and trade-offs
- A single array may require longer cable routes or a large service upgrade.
- Distributed systems have more locations to inspect and maintain.
- Concentrating capacity on one roof may increase dependence on that building's roof condition.
Information you may need
- Roof and site plans for every building
- Structural, shade, and electrical assessments
- Itemized proposals separating recurring per-building costs from capacity-related costs
Your next step
What to do next
Compare layouts using total installed cost, expected production, maintenance access, roof life, and electrical work—not capacity alone.
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