Solar Design Software vs Solar Drafting Software: What's the Difference?

If you search "solar design software," you'll get results ranging from Aurora Solar to PVcase to AutoCAD plugins to energy modeling tools. That's because "solar design" means completely different things depending on where you sit in the project lifecycle.

A salesperson searching "solar design software" wants a tool to generate customer proposals. An engineer searching the same phrase wants a tool to produce construction documents. A developer searching it might want utility-scale layout optimization. These are fundamentally different tools solving fundamentally different problems — but they all show up under the same search term.

This guide breaks down what each category of tool actually does, who uses it, and which one you probably need based on the work in front of you.

The Solar Project Lifecycle

A commercial or industrial solar project moves through distinct stages. Each stage has different tools, different users, and different outputs.

Stage 1: Site Assessment

What happens: A crew visits the site (or flies a drone) to capture existing conditions. Roof measurements, obstruction locations, structural details, shading sources.

Tools: Scanifly, DroneDraft, Google Earth Pro, manual surveys

Users: Field technicians, project developers

Output: 3D models, point clouds, orthomosaic images, as-built measurements

These tools answer the question: What does the site look like, and what can we build on it?

Stage 2: Design & Proposals

What happens: An engineer or designer creates a preliminary system layout. Panels are placed on the available roof or ground area. Energy production is estimated. A proposal is generated for the customer or financing party.

Tools: Aurora Solar, Helioscope, OpenSolar, Solargraf, Solesca, SolarEdge Designer

Users: Solar designers, sales engineers, project developers

Output: System layouts, production estimates, shade reports, customer-facing proposals, financial models

These tools answer the question: How many panels can we fit, how much energy will they produce, and what will it cost?

This is what most people mean when they say "solar design software." The majority of results for that search term fall into this category.

Stage 3: Engineering

What happens: A licensed professional engineer reviews the design and performs the calculations required for permitting. Structural analysis, electrical load calculations, voltage drop, wire sizing, code compliance review.

Tools: Primarily manual (Excel spreadsheets, engineering judgment, jurisdiction-specific checklists). Some firms use PVsyst for advanced energy modeling. SkyCiv or similar for structural calcs.

Users: Licensed PEs, electrical engineers, structural engineers

Output: Stamped calculation packages, single-line diagrams, load schedules, specification sheets

These tools answer the question: Does this system meet code, and will the PE sign off on it?

Stage 4: Construction Documents

What happens: The approved design gets drafted into construction-ready drawings. Strings are drawn connecting panels to inverters. Homeruns are routed from string endpoints to electrical equipment. Cable lengths are calculated and exported. Tags and labels are placed.

Tools: Leaf, PVCAD (PVComplete/Enact), Virto.CAD, PV Rocket, or manual AutoCAD drafting

Users: CAD technicians, electrical engineers, EPC drafting teams

Output: Permit-ready plan sets, string layouts, homerun routing, cable length schedules, equipment tags

These tools answer the question: What exactly does the installation crew need to build?

This is "solar drafting software." It operates inside AutoCAD (or similar CAD environments) and produces the actual construction drawings that go to permitting and to the field.

Stage 5: Installation & Commissioning

What happens: Field crews build what the construction documents specify. Equipment is installed, wired, inspected, and commissioned.

Tools: Project management software (Scoop Solar, Sitetracker), commissioning tools from inverter manufacturers

Users: Installers, electricians, project managers, inspectors

Output: A built, inspected, operational solar system

The Gap Most Teams Experience

Here's the workflow problem: Stages 2 and 4 produce drawings that look superficially similar — both show panels on a roof with lines connecting them. But they serve completely different purposes and contain completely different information.

A proposal drawing from Aurora or Helioscope is designed to communicate the general system concept to a customer. It shows where panels go, roughly how they're connected, and what the system will produce. It does not need to be dimensioned, does not need to follow CAD standards, and does not need to contain the level of detail an installer requires.

A construction drawing from AutoCAD is designed to tell an installation crew exactly what to build. Every string is explicitly defined. Every homerun is routed. Cable lengths are specified. Equipment locations are dimensioned. Layer standards follow company or jurisdictional requirements.

The gap between these two outputs is where a lot of manual labor lives. Many teams spend hours recreating in AutoCAD what was already loosely defined in their proposal tool. The panel layout exists in Aurora, but it has to be rebuilt in CAD. The string configuration was validated in Helioscope, but it has to be redrawn by hand.

Proposal tools and drafting tools are complementary. They're not the same tool, and the output of one doesn't substitute for the output of the other.

Can One Tool Cover Everything?

Some tools try to span multiple stages.

PVcase covers Stages 2 through 4 for utility-scale ground mount projects. It handles layout, electrical design, and construction document generation in a single environment. For large ground mount projects, this integrated approach makes sense because the scale demands it.

Aurora Solar covers Stage 2 and generates basic permit documents for residential projects. For residential installers who need proposals and simple permit packages from the same tool, this works well.

But for commercial and industrial projects — the 200-panel rooftop, the 5MW carport, the mid-size ground mount — most teams use separate tools at each stage. The proposal comes from Helioscope or Aurora. The engineering comes from spreadsheets and engineering judgment. The construction documents come from AutoCAD.

This isn't because the industry lacks ambition for integrated tools. It's because the requirements at each stage are different enough that specialized tools do each job better than any single tool does all of them.

What You Should Search For

Based on what you actually need to accomplish:

"I need to create customer proposals with production estimates" Look at: Aurora Solar, Helioscope, OpenSolar, Solargraf These are solar design and proposal tools.

"I need advanced energy modeling and simulation" Look at: PVsyst, Helioscope (for simpler models) These are energy modeling tools.

"I need to produce construction documents in AutoCAD" Look at: Leaf, PVCAD, Virto.CAD, PV Rocket These are solar drafting and CAD automation tools.

"I need an integrated tool for utility-scale ground mount" Look at: PVcase This is an integrated solar engineering and design tool for large projects.

"I need 3D site models from drone data" Look at: Scanifly, DroneDraft These are site assessment and modeling tools.

"I need to outsource construction document production" Look at: PurePower Engineering, Greenlancer These are outsource engineering and drafting services, not software.

Where Leaf Fits

Leaf is a Stage 4 tool. It automates the drafting work involved in producing construction documents inside AutoCAD.

Specifically, Leaf handles:

• Stringing — connecting panels into strings with voltage window compliance
• Homerun routing — routing conductors from string endpoints to electrical equipment using K-means optimized pathing
• Cable length export — measuring actual polyline lengths and exporting to Excel
• Tags — generating equipment labels and circuit identifiers
• SolarEdge PDF import — converting SolarEdge Designer layouts into intelligent CAD objects

Leaf does not do panel layout, energy modeling, proposals, wire sizing, voltage drop calculations, or permit package generation. Those belong to other stages and other tools.

The tagline is straightforward: we do the drafting, you do the engineering. Leaf executes the repetitive CAD work so engineers can focus on the decisions that actually require their expertise.

The Bottom Line

"Solar design software" is an umbrella term that covers fundamentally different tools. If you're spending time searching for a solution and the results aren't matching what you need, the issue might be that you're searching the wrong category.

Figure out which stage of the project lifecycle you're trying to improve. Then search for the tool category that matches that stage. You'll find better options faster and avoid evaluating tools that were never built for the problem you're solving.

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If you're looking for construction document automation in AutoCAD, try Leaf free for 14 days — no credit card required.