The hardest moment in a solar sale is when the customer tries to connect the numbers in your proposal to their own roof. "24 modules of 450 Wp, 10.8 kWp" is precise information for an engineer; for a homeowner or a factory manager it is an abstract line on a page. This article covers how to use 3D roof design in the sales conversation, how to structure the meeting step by step, what to show and what not to show, and the mistakes that are easy to make.
What customers struggle to imagine
The same questions come up in almost every site meeting. Most of them exist because the customer cannot picture the system in their head:
- Appearance: How much of the roof will be covered, and what will it look like from the street?
- Layout logic: Why isn't the whole roof filled? Why are some areas left empty?
- Obstacles: What happens around the chimney, the antenna, the skylight or the AC unit?
- Shading: How much will the neighbouring building or the tree in the garden affect output, especially in winter?
- Maintenance and safety: How will someone get on the roof for cleaning or repairs? Can you walk between the panels?
- Equipment location: Where will the inverter and the distribution board go, and where will the cables run?
None of these questions can be fully answered with a table. A 3D model built to scale answers most of them at a glance and moves the conversation from "can I trust this?" to "which option suits me?".
How a 3D presentation helps the sale
- Trust: The customer sees their own roof drawn with real dimensions, which shows the proposal was not copied from a template.
- Clarity: Module count, installed capacity and layout are tied together, so the numbers have a visual meaning.
- Fewer change requests later: Requests such as "could we add panels on that corner?" are discussed in the meeting, not after installation.
- A shared reference: If the real decision-maker is not in the room, a shared 3D link shows them the same picture.
Running a 3D presentation meeting, step by step
- Preparation (before the meeting): Check the site survey data, roof measurements and photos. Build the model from that data; do not show a customer a model based on guessed dimensions.
- Start with something familiar: Open with the customer's building on satellite imagery, surroundings included. People want to recognise their own home first.
- Explain the usable area: Show the edge setbacks, the clearances around chimneys and antennas, and the walkways. Answer "why isn't the whole roof used?" before they ask.
- Show the module layout: Give the module count and installed capacity at this point. A number heard together with a layout is easier to remember.
- Run the sun and shade simulation: Pick one day in summer and one in winter, and show how shadows move in the morning, at noon and in the afternoon. Explain why shaded positions were left out, or why they were accepted.
- Discuss equipment location: Walk through the planned inverter, board and cable route, using the site survey photos. Note any objections now.
- Move on to the numbers: Open the yield estimate, cost and payback period only once the customer has a clear picture of the system.
- Share the link and agree the next step: Send the 3D link and confirm the decision date and any revision requests.
What to show
| Element | Customer question it answers |
|---|---|
| Roof drawn to scale, with pitch | Is this really my roof, and are the dimensions right? |
| Module layout and count | How much area is covered and how many panels am I buying? |
| Obstacles and setbacks | What about the chimney and antenna, and why are the edges empty? |
| Walkways | How will cleaning and maintenance work? |
| Sun and shade simulation | How much will the tree or the next building cost me? |
| Inverter and board location | Where in the building will the equipment go? |
If you want to go deeper on shading, see our article on why shading analysis matters.
Different emphasis for residential and commercial customers
The same 3D model should be presented differently to different types of customer:
- Residential customers: Appearance, how it looks from the street, whether the roof will be damaged and how easy maintenance will be come first. Use views close to what a photo of the house would show.
- Commercial and industrial customers: They ask more about how much of the usable area is used, walkways for workplace safety, clashes with existing roof equipment (ventilation, skylights) and how production relates to consumption. If a technical manager is in the meeting, the CAD view and dimensions are more useful.
- When someone else makes the investment decision: Give the person in the meeting a short summary and the 3D link they can pass on to the decision-maker.
Sharing a 3D link
In residential projects the decision is often made by the family together; in commercial projects it may sit with the board or the finance department. When people who missed the meeting only see a PDF proposal, most of the effect of the presentation is lost. So:
- Send the 3D link straight after the meeting, with a short note explaining what they are looking at.
- State which proposal revision the link belongs to, so an old layout does not get mixed up with a new price.
- If you revise the design, stop using the old link and send the customer the current one.
Objections a 3D presentation helps answer
- "My roof can't take that many panels." A scaled model shows whether the area is really sufficient, or why fewer panels were proposed. Load-bearing capacity is a separate structural question; answer it with calculation, not with a picture.
- "It will look ugly." Views from the front and from street level let you discuss the concern with something concrete.
- "The neighbour's building will shade us." The simulation shows in which months and at which hours the shadow reaches which modules.
- "Another installer offered more panels." Once setbacks, walkways and shading losses are visible, it becomes clear that more panels are not always better.
Common mistakes
- Over-promising: A 3D model is impressive, but it should never be presented as a promise separate from the yield estimate. Every module shown in the visual must match the proposal and the production calculation.
- Unrealistic visuals: Leaving out obstacles, removing the shading tree from the model or skipping setbacks makes the render prettier, but the result on site will differ, and the customer will notice during installation.
- Unverified dimensions: Satellite imagery is a good starting point, but a firm proposal should not go out before the measurements are confirmed on site.
- Drowning the meeting in detail: String layout and MPPT matching matter for engineering, but unless the customer asks, they should not be the focus of the presentation.
- No follow-up: Instead of sending the link and waiting, call the customer on the agreed date and close the open questions.
3D roof design with PVAGE
In PVAGE you draw the roof to scale on satellite imagery or a photo and give each roof segment its own pitch. Modules are placed automatically or manually; you define edge setbacks and walkways, and add obstacles such as chimneys and antennas as well as shading objects such as neighbouring buildings and trees, with their heights. In the sun simulation you pick a month and an hour to show how shadows move, and you can see shading loss per module.
The design can be reviewed in a 3D scene, in CAD view and with a drone tour, and shared with the customer as a 3D link. The 3D scene can also be added to the proposal approval link. See the 3D roof modelling page for details, and our solar proposal guide for the proposal itself.