Choosing a Commercial Solar Installer: Questions to Ask
Compare commercial solar proposals on site suitability, design assumptions, service responsibilities and written commercial terms.
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What to check first
- Request a documented site assessment
- Compare equipment specifications and yield assumptions
- Review warranties, maintenance and contract exclusions
Compare proposals on the same assumptions
Give each bidder the same consumption profile and site information. Ask for a design explanation, equipment schedule, assumptions behind estimated generation and a description of exclusions. Estimates should distinguish the proposed system from what has actually been measured.
Review who takes responsibility for installation, approvals and after-sales support. Check references from comparable projects and clarify warranty escalation. Have qualified specialists assess technical suitability rather than choosing solely on the lowest initial quotation.
Official references and further reading
Use current source documents for requirements, product features and jurisdiction-specific decisions. Links do not imply endorsement or specialist review.
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Editorial update: Oxford Training and Research. Prepared with AI-assisted drafting; the original author record is retained. No independent product testing or specialist review is claimed.
