Path-Q Solar
What costs should I include when comparing rooftop solar with a ground-mounted system?
Answer
Compare total installed and lifetime costs, not just panel and inverter prices. Include mounting, structural work, site preparation, trenching, wiring, permitting, interconnection, drainage or fencing, land use, maintenance access, roof work avoided or required, and any differences in production or repairability.
Key points
- Rooftop systems may require roof assessment, reinforcement, or future panel removal for reroofing.
- Ground mounts may require foundations, grading, vegetation control, fencing, and underground wiring.
- Ground mounts can be easier to access but may have greater site-security or land-use requirements.
- The useful comparison includes expected production, losses, maintenance, and replacement access.
What it depends on
- Roof condition and available roof area
- Ground conditions and distance to the electrical service
- Array size and orientation
- Site preparation and security requirements
- Maintenance and future roof-replacement plans
Risks and trade-offs
- A ground mount may have higher upfront civil and electrical costs but easier servicing.
- A rooftop system may use existing space but expose equipment to roof-access constraints.
- Ignoring lifetime site work or roof work can reverse the apparent lowest-cost option.
Information you may need
- Comparable rooftop and ground-mount layouts
- Structural and geotechnical assumptions
- Cable-route and trenching estimate
- Production and lifecycle-maintenance estimates
Your next step
What to do next
Request two itemized proposals using the same target capacity and production assumptions, with one-time and lifetime costs shown separately.
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