By Brett Duguay | BD Electrical & Solar | September 30, 2026
A solar proposal often starts with a panel count and an annual production estimate. Those numbers matter. They are also only the beginning of the design.
An abundant energy resource still needs a complete delivery system. At the scale of your property, that means a suitable roof or ground location, properly designed electrical equipment, utility approval, and a system that fits how you use electricity.
Start with the property, then choose the equipment
Two roofs with the same square footage can produce very different results. Direction, slope, shade, obstructions, and usable mounting area affect the layout. Roof condition matters because removing and reinstalling an array for a roof replacement creates avoidable work.
A ground-mounted system introduces different questions: where it can be placed, how far power must travel, what the trench crosses, and how the foundation will be built. Moving an array farther into a yard may improve the view from the house while increasing trench length or shading. That tradeoff belongs in the proposal.
Panel capacity and energy production are different
Kilowatts describe power. Kilowatt-hours describe energy over time. A 10-kilowatt array does not produce 10 kilowatts continuously, and two 10-kilowatt systems do not necessarily generate the same annual energy.
Panel ratings are usually stated on the DC side. The inverter converts that power to AC for the building and grid. The relationship between array size and inverter capacity is a design choice. At certain times, output may be limited by the inverter or by an approved export setting. A responsible production model accounts for those limits.
The electrical connection can shape the project
The roof may have room for more panels than the existing electrical equipment can readily accommodate. Service ratings, bus ratings, conductor routing, and the point of connection all need review. On some projects, an equipment change makes sense. On others, a different system size or connection approach is more practical.
Utility review is a separate step from a local electrical inspection. Installing equipment correctly does not automatically authorize it to operate in parallel with the grid. That distinction should be clear in the schedule.
Decide what you want the system to accomplish
Reducing purchased electricity and maintaining power during an outage require different capabilities. Ordinary grid-connected solar generally shuts down when utility power fails. Backup requires a system designed for that operating mode, including appropriate controls and isolation from the utility.
A battery can shift energy into a later part of the day or support selected loads during an outage. It also adds cost and operating choices. Its size should follow the job you want it to do.
What a useful proposal should explain
At BD, the discussion should connect the equipment to the property: why this layout, what the production estimate assumes, what electrical work is included, and which approvals remain. If you expect to add an EV or heat pump, include that in the planning conversation before the layout is finalized.
Explore residential energy systems or commercial energy projects. Bring a recent electric bill and your future equipment plans; those are more useful starting points than a target panel count.