Most solar proposals are still built on eyeballed roof measurements and a generic panel layout — not the customer's actual rooftop. That gap shows up later as cost overruns, subsidy mismatches, or an install that simply doesn't fit.
What guesswork gets wrong
- Panel count — based on rough roof area, not real usable space after obstacles.
- Shading — rarely checked before the quote goes out. See why that matters.
- Energy output — generic estimates instead of numbers specific to that roof's orientation.
- Subsidy amount — the wrong system size means a wrong subsidy figure on the customer's proposal.
A 3D model of the actual rooftop fixes all four at once — it places real panels on real roof geometry, runs shadow analysis across the year, and calculates output from that exact layout, not an average.
Faster deals, fewer disputes
Customers can see their own roof in the proposal, not a stock image — which builds trust and closes deals faster. Solar 3D Design and Solar Proposal work together to turn a verified design into a branded, subsidy-ready proposal in minutes. Start with the right system size and build from there.