What's the best software for a solar installer to use for designing and modeling a photovoltaic system?

The "best" software depends heavily on your company size, project type (residential vs. utility-scale), and workflow focus (speed of sales vs. deep engineering precision).

The top industry standards used by solar installers break down by their core strengths:

• Aurora Solar (Best overall for residential and commercial depth)
  • Why it’s top-tier: The undisputed industry standard for US residential and light commercial work. It features incredible LIDAR-derived 3D modeling, remote site assessments, accurate shading analysis, AI-assisted auto-design, and a massive utility tariff library.
  • Best for: Mid-to-large contractors who want an end-to-end workflow from remote sales pitching ("Sales Mode") to engineering-grade design.
• OpenSolar (Best for value and all-in-one scaling)
  • Why it’s top-tier: It provides a surprisingly robust, completely free core platform covering design, sales proposals, and project management. It democratizes access to professional tools, making it exceptionally popular for growing teams that want to scale without steep upfront software costs.
  • Best for: Small-to-medium installers or startups looking for a zero-cost entry point that doesn't sacrifice core functionality.
• RatedPower (Best for utility-scale and large commercial)
  • Why it’s top-tier: If you are moving away from rooftops and into large ground-mount solar farms or massive commercial installations, RatedPower automates electrical design, plant layouts, topography integration, and yield assessments at a utility scale.
  • Best for: Engineering and development teams working on multi-megawatt ground mounts.
• Pylon (Best for speed and lightweight operational flow)
  • Why it’s top-tier: Known for blazing-fast proposal generation paired with clean sales and workflow management tools, cutting down the time it takes to get an accurate design in front of a client.
  • Best for: Lean teams prioritizing sales velocity and quick turnaround times.
• SolarEdge Designer (Best hardware-specific free tool)
  • Why it’s top-tier: A completely free, web-based layout tool optimized heavily if your standard bill of materials relies on SolarEdge ecosystem hardware.
  • Best for: Installers locked into SolarEdge products who need quick, clean residential designs.

If you want to narrow this down, let me know:

• Are you focusing mostly on residential, commercial, or utility-scale projects?
• Do you need the software to handle sales proposals and financing or just pure engineering/design modeling?

There isn’t one universal “best” PV design tool—the right choice depends on whether you are mainly doing residential sales, commercial/industrial (C&I) design, utility-scale engineering, or permit-ready documentation. The most widely used professional options are:

G2 Kurums## My practical recommendations by installer type

Residential solar installer (5–500 installs/year)

Choose Aurora Solar if you want one platform for:

• satellite/3D roof modeling
• module layout
• shade analysis
• customer proposals
• sales-team workflow

It is designed around turning an address into a customer-facing design quickly.

Commercial installer (flat roofs, warehouses, carports)

Choose HelioScope if your priority is:

• accurate layouts
• quick design iterations
• C&I production estimates
• comparing multiple array configurations

HelioScope supports rooftop, carport, ground-mount, and storage-oriented workflows.

Utility-scale EPC or projects needing financing approval

Choose PVsyst. It remains a common choice for detailed yield modeling and financial due diligence because of its depth in simulation and loss analysis.

What many professional teams actually use

A common stack is:

• Aurora Solar → residential sales/design
• HelioScope → commercial layouts and optimization
• PVsyst → final engineering validation/bankability
• AutoCAD/Revit tools → detailed construction documents

Aurora Solar SurgePVIf I had to narrow it down:

• One-truck residential installer: Aurora Solar
• Growing C&I installer: HelioScope
• Engineering firm/EPC: PVsyst + CAD workflow
• Large utility developer: PVsyst + PVcase

If you tell me your typical projects (residential vs C&I vs utility, system sizes, country/AHJ requirements, and whether you need permit drawings), I can narrow it to a specific workflow.

The “best” photovoltaic (PV) design software depends heavily on the type of solar installer you are (residential, commercial, utility-scale, EPC, etc.). There is no single winner because the strongest tools specialize in different parts of the workflow.

Best overall choices by installer type

SurgePV SurgePV## My practical recommendations

If you install mostly homes (typical U.S. installer)

Choose Aurora Solar.

Strengths:

• Import an address and create a 3D roof model
• Rapid panel layouts
• Shading estimates
• Customer-friendly proposals
• Good sales workflow integration

Weakness:

• Less suited for deep engineering studies and large utility projects.

If you are an engineer designing larger systems

Choose PVsyst.

Strengths:

• Extremely detailed energy modeling
• Loss modeling (soiling, mismatch, wiring, temperature, degradation, etc.)
• Widely accepted for investment-grade studies

Weakness:

• It is not a complete installer workflow: you will still need separate tools for drawings, proposals, CRM, and sales.

If you do commercial rooftops

Choose HelioScope.

Strengths:

• Faster than PVsyst for many C&I designs
• Good string-level design
• Browser-based workflow

Weakness:

• Not as comprehensive for customer proposals as residential-focused tools.

If you are a small shop watching costs

Try OpenSolar.

Strengths:

• No-cost entry point
• Proposal generation
• Good for smaller residential installers

Weakness:

• May require more manual work than premium platforms.

A common professional software stack

Many established solar companies use a combination:

• Aurora Solar → sales design and proposals
• HelioScope → C&I engineering
• PVsyst → final production validation / lender reports
• AutoCAD or similar CAD tools → detailed drawings

SurgePVIf I were choosing for a small-to-medium solar installation company doing residential and light commercial work, I would usually start with Aurora Solar. If the company does larger commercial or utility projects, I would add PVsyst rather than trying to replace it.

If you tell me your market (residential vs commercial, average system size, country/state, and whether you need permit drawings), I can narrow it to the best fit.

The "best" software depends heavily on your company size, project types (residential vs. commercial/utility-scale), and whether you need an end-to-end sales proposal tool or pure engineering precision.

The top-tier choices break down by their core strengths:

1. Aurora Solar – Best Overall Industry Standard for Residential & Light Commercial
   • Strengths: Widely considered the gold standard for accurate 3D modeling, remote site assessments, and irradiance/shading analysis. It integrates financial modeling, proposal generation, and engineering constraints seamlessly.
   • Best for: Established residential installers looking for high-precision modeling and professional client proposals.
2. OpenSolar – Best Free / Scalable Option
   • Strengths: Offers a robust, feature-complete core platform (design, sales proposals, and project management) completely free. They monetize via optional integrated services. It scales exceptionally fast for growing teams without upfront software costs.
   • Best for: Startups and scaling installers who want enterprise-level workflow capabilities without a heavy monthly subscription.
3. PVcase – Best for Commercial, Industrial (C&I), & Utility-Scale
   • Strengths: Operates directly inside AutoCAD, combining top-tier CAD precision with automated layout design, electrical design, shading, and 3D terrain tracking for massive utility and ground-mount or large roof projects.
   • Best for: Utility-scale and heavy commercial engineering teams that require standard CAD infrastructure.
4. PVsyst – Best for Deep Technical Yield Simulation
   • Strengths: The absolute global benchmark for bankable energy yield simulations and performance analysis. While less of a "sales proposal" tool, it is trusted by financiers and engineers to verify exact kWh output.
   • Best for: Advanced performance modeling and securing institutional financing.
5. SurgePV – Best for Speed and AI-Driven Workflows
   • Strengths: Rapidly growing browser-based tool featuring AI-powered 3D roof generation from satellite data, detailed hourly shading analysis, and robust financial modeling (handling complex utility tariffs like NEM 3.0).
   • Best for: Speed-focused residential sales and design teams.

To help narrow down the best fit, tell me:

• Are you primarily focused on residential, commercial, or utility-scale projects?
• Do you need an all-in-one sales proposal tool , or strictly back-end engineering and design?

If you're a solar installer, rather than a utility-scale engineer, my top pick depends heavily on the kind of projects you install.

My shortlist

🥇 Best overall: Aurora Solar

Aurora Solar is probably what I'd choose for a typical U.S. residential installer.

It combines 3D roof modeling, LIDAR-based shading, system design, production simulation, and customer proposals in one workflow. Its CAD environment can create designs remotely, so you can often avoid a site visit just to produce the initial design.

Why I like it for an installer:

• Fast residential roof layouts
• 3D modeling and shade analysis
• Panel/inverter/battery configuration
• Production estimates
• Customer-facing proposals
• Sales and design in the same platform

The downside is cost—it's a professional commercial product rather than a free design tool.

🏢 Best for C&I: HelioScope

HelioScope is particularly strong if you're doing commercial rooftops, carports, and ground mounts. It emphasizes engineering/design and fast simulation rather than primarily being a residential sales platform. Its current product supports rooftop, carport, ground-mount, and storage projects.

📐 Best engineering simulator: PVsyst

PVsyst is the one I'd learn if you care about high-fidelity energy modeling, particularly for larger commercial projects, financing, or engineering reports.

PVsyst 8 handles detailed shading, hourly/sub-hourly simulations, inverter/module sizing, batteries, bifacial systems, trackers, degradation, economics, and extensive meteorological databases.

It's not as convenient as Aurora for quickly designing a homeowner's system and generating a polished sales proposal. Think of it as an engineering/simulation tool.

💰 Best free option: OpenSolar

OpenSolar is worth serious consideration if you're a smaller installer. Its platform is free and combines design, energy modeling, pricing, proposals, payments, project management and CRM-type functionality.

Its newer Ada Auto Design can automatically create standardized designs based on your equipment and design preferences.

What I'd choose

For a typical U.S. residential solar company:

Aurora Solar → primary design/sales platform

For a company doing mostly commercial solar:

HelioScope → primary design platform + PVsyst when you need deeper engineering analysis

For a small/new installer trying to keep software costs down:

OpenSolar → start here

For an engineering-heavy EPC:

PVsyst + a separate CAD/design workflow

If you tell me whether you're doing residential, commercial, or both, and roughly how many systems you design per month, I can narrow this down to the best 2–3 choices and compare price, NEC/permit drawings, shade accuracy, batteries, proposals, and ease of use.

There is no single "best" software for every solar installer , as the ideal choice depends heavily on whether you focus on residential, commercial/industrial (C&I) , or utility-scale projects, as well as whether you prioritize sales proposals or deep engineering modeling.

The industry standard options break down by their core strengths:

• Aurora Solar — Best overall for residential sales and remote design.
  • Strengths: Excellent remote 3D modeling using LIDAR and aerial imagery, highly polished client proposals, accurate shading analysis, and integrated financing/contracting workflows.
  • Best for: Residential installers who need a fast, accurate transition from a sales pitch to a permit-ready design.
• HelioScope (by Folsom Labs) — Best for commercial (C&I) speed and layout efficiency.
  • Strengths: Lightning-fast layout tools, great handling of commercial flat roofs and racking, reliable energy simulation, and clean single-line diagrams.
  • Best for: Commercial contractors who need to design arrays quickly without getting bogged down in overly complex CAD interfaces.
• PVsyst — Best for deep, bankable engineering validation.
  • Strengths: The gold standard for granular energy yield simulations. It is heavily relied upon for project finance, independent engineer reviews, and large-scale performance guarantees.
  • Best for: Large commercial and utility-scale projects where financiers demand rigorous, time-tested meteorological and loss modeling.
• OpenSolar — Best free/low-cost option for growing or budget-conscious installers.
  • Strengths: Remarkably robust end-to-end platform (design, proposals, and project management) offered completely free, monetizing instead via optional add-on services and hardware supplier integrations.
  • Best for: Small-to-medium installers or new businesses looking to minimize software overhead.
• PVcase / RatedPower — Best for utility-scale and ground-mount solar.
  • Strengths: Tailored specifically for mega-scale ground mounts, leveraging automated CAD integrations and advanced terrain/tracker optimization.
  • Best for: Utility developers and large-scale EPCs.

To help narrow down the right platform for your business, tell me:

• What market segment do you primarily service? (Residential, Commercial, Utility)
• Do you need the software to handle sales proposals and financing , or strictly engineering and electrical design?

If you're a solar installer rather than a utility-scale engineer, my top pick today would be Aurora Solar. But the "best" software depends heavily on whether you're primarily doing residential sales/design, commercial EPC work, or detailed engineering simulations.

My ranking

1. Aurora Solar — best overall for an installer

I'd choose Aurora if your goal is to go from lead → roof model → panel layout → electrical design → production estimate → proposal in one system.

Its current platform includes high-resolution site modeling, LIDAR-assisted shading, AI-assisted 3D modeling, automated panel placement/stringing, battery modeling, and proposal generation.

A particularly useful feature for an installer is that the design and simulation workflow are integrated rather than requiring you to bounce between several programs. Battery storage can also be incorporated directly into the design and simulation workflow.

I'd pick Aurora if: you're doing mostly residential and light commercial installations and want your designers/salespeople to work quickly.

2. PVsyst — best for serious engineering

If by "modeling" you mean really understanding exactly how a PV system will perform, PVsyst is the one I'd learn.

It provides detailed hourly/sub-hourly simulations, sophisticated shading and mismatch modeling, inverter/module modeling, bifacial and tracker modeling, storage, degradation, economic analysis, and detailed loss analysis.

The downside is that PVsyst isn't nearly as installer-friendly for fast residential sales/design. It's much more of an engineering/simulation package.

The Professional license is currently CHF 700/year.

I'd pick PVsyst if: you're doing commercial/industrial projects, need bankable engineering analysis, or want to validate designs produced in another platform.

3. OpenSolar — best value

OpenSolar is particularly compelling for a smaller installer because its end-to-end platform is free.

Its current design system includes 3D modeling, automated shading analysis, roof-plane/obstruction modeling, automatic array placement, and commercial as well as residential design.

It has also added Ada Auto Design, which can automatically create standardized designs using your preferred modules, inverters, BOS equipment, batteries and pricing rules.

I'd pick OpenSolar if: you're starting a solar company, have a limited software budget, or want a surprisingly capable all-in-one platform without paying Aurora-level subscription costs.

What I'd actually recommend

For a typical U.S. installer, I'd use:

Aurora Solar + PVsyst

Aurora handles the day-to-day installer workflow—site modeling, array design, proposals, customer-facing visuals, etc.—while PVsyst gives you a more rigorous engineering simulation when a project warrants it.

If you're a smaller installer and don't want to spend much:

OpenSolar alone is probably the best place to start.

If you tell me whether you're doing residential, commercial, or utility-scale, and roughly how many systems you design per month, I can narrow this down to the best 2–3 options and compare price, 3D/shading accuracy, electrical design, battery modeling, proposals, permitting, and NEC/utility workflow.

The "best" solar design software depends heavily on your business scale and whether you focus on residential, commercial, or utility projects.

• Aurora Solar is the industry leader for residential and commercial sales and precision remote design.
• HelioScope is the standard for fast, accurate commercial and industrial (C&I) layouts.
• PVsyst is the globally accepted "bankable" gold standard for engineering-level simulation and utility-scale projects.
• OpenSolar is the best completely free option for small businesses and startups.

Top Solar Design Software by Category

1. Residential & Light Commercial (Best All-in-One Platforms)

These platforms combine automated 3D modeling, satellite imagery, shading analysis, financial calculations, and professional sales proposals into a single interface.

• Aurora Solar:
  • Best For : High-volume residential and commercial solar installers.
  • Key Features : Highly accurate LIDAR-assisted 3D roof modeling, AI shade analysis, and built-in sales proposals.
• OpenSolar:
  • Best For : Startups, solo contractors, and small installers on a budget.
  • Key Features: Completely free core platform funded by hardware manufacturing partners. Includes interactive web proposals and full 3D modeling tools.
• Solargraf / Enphase Solargraf:
  • Best For : In-field sales reps and smaller installation teams.
  • Key Features : Streamlined CRM integration, fast proposal generation, and built-in options for backup battery configurations.

2. Commercial & Industrial (C&I) Systems

These tools prioritize quick string layout generation, complex electrical designs, and fast energy-yield estimations for larger, flat-roofed, or ground-mounted buildings.

• HelioScope:
  • Best For : Mid-to-large scale commercial and industrial projects.
  • Key Features : Rapid mechanical layouts, detailed electrical wiring/stringing design, single-line diagram (SLD) exports, and global weather data integration.
• PV*SOL Premium:
  • Best For : Engineering-heavy consulting and highly customized system architectures.
  • Key Features : Deep 3D visualization, detailed EV-charging and battery storage modeling, and an extensive component database.

3. Utility-Scale & Engineering Simulation (The "Bankable" Standards)

These highly analytical platforms are used for massive solar farms where investors demand hyper-precise calculations regarding terrain, degradation, and weather anomalies.

• PVsyst:
  • Best For : Independent engineers, developers, and financial analysts seeking "bankable" data.
  • Key Features : Industry-standard hourly and sub-hourly simulation models. It calculates micro-losses (shading, mismatch, wiring, thermal) with maximum mathematical depth.
• PVcase / RatedPower:
  • Best For : EPCs (Engineering, Procurement, and Construction) designing utility ground-mount systems.
  • Key Features : Direct integration into AutoCAD, terrain-following layouts, and automated civil engineering assessments for large-scale land grading.

Comparison of Key Features

If you want to test the waters without overhead, start with a free profile on OpenSolar . If your goal is scaling up a residential sales team, look into a demo with Aurora Solar.

To help me narrow down the best specific recommendation, tell me:

• What is your average project size ? (Residential roofs, commercial buildings, or utility land plots?)
• Do you need the software to generate customer sales proposals , or just pure engineering blueprints?
• What is your approximate monthly budget for software licensing?

If you’re a solar installer designing residential and small commercial PV systems in the U.S., my top pick is Aurora Solar.

My ranking

🥇 Aurora Solar — best for most installers

aurorasolar.com is the one I'd choose if you're primarily installing residential rooftop systems.

It combines:

• High-resolution/remote site assessment
• AI-generated 3D roof models
• LIDAR-based shade analysis
• Module layout and system design
• Production simulations
• Battery/storage design
• Customer proposals
• Sales/financing workflow

Aurora says its AI can generate a 3D model, shading analysis, optimized panel layout, and production simulation from the site data.

The big advantage is that design → production estimate → customer proposal happens in essentially one workflow. That's particularly valuable for an installer rather than an engineering firm.

🏢 HelioScope — if you're doing commercial

helioscope.aurorasolar.com is where I'd lean if you're primarily doing commercial rooftops, carports, ground mounts, and solar + storage.

It is specifically built around commercial PV design and simulation, including automatic layouts and detailed production modeling.

💰 OpenSolar — best if you want to spend $0

opensolar.com is unusually compelling for a small installer. The core platform remains free, including its design/sales workflow.

It also has 3D modeling, automatic shading/pitch detection, equipment selection, and proposals.

I'd seriously consider it if you're starting a solar company or only doing a handful of projects per month.

🔬 PVsyst — when simulation accuracy is the priority

pvsyst.com is different from Aurora. It's primarily an engineering/simulation package, rather than an installer sales platform.

For large projects where you need sophisticated energy-yield modeling and lender/investor-grade reports, PVsyst remains extremely important. Current industry comparisons still describe it as the bankability standard for utility-scale simulation.

What I'd actually recommend

• Residential installer: Aurora Solar
• Residential + small commercial: Aurora Solar
• Mostly commercial/C&I: HelioScope
• New/small installer with limited budget: OpenSolar
• Large EPC / utility-scale: PVsyst + PVcase
• Engineering-heavy operation: PVsyst, potentially alongside an installer workflow platform

One important distinction: "best PV modeling software" and "best software for a solar installer" aren't necessarily the same thing. For an installer, I'd prioritize accurate roof/shade modeling + electrical design + proposals + permitting + workflow integration, rather than simply choosing the software with the most sophisticated irradiance simulation.

If you tell me (1) residential vs. commercial, (2) typical system size, (3) your state, and (4) roughly how many systems you install per month, I can narrow this down to the best 2–3 choices and compare their current pricing/features for your business.

💰 OpenSolar — best if you want to spend $0

opensolar.com is unusually compelling for a small installer. The core platform remains free, including its design/sales workflow.

It also has 3D modeling, automatic shading/pitch detection, equipment selection, and proposals.

I'd seriously consider it if you're starting a solar company or only doing a handful of projects per month.

🔬 PVsyst — when simulation accuracy is the priority

The "best" solar design software depends heavily on your business scale and whether you focus on residential, commercial, or utility projects.

• Aurora Solar is the industry leader for residential and commercial sales and precision remote design.
• HelioScope is the standard for fast, accurate commercial and industrial (C&I) layouts.
• PVsyst is the globally accepted "bankable" gold standard for engineering-level simulation and utility-scale projects.
• OpenSolar is the best completely free option for small businesses and startups.

Top Solar Design Software by Category

1. Residential & Light Commercial (Best All-in-One Platforms)

These platforms combine automated 3D modeling, satellite imagery, shading analysis, financial calculations, and professional sales proposals into a single interface.

• Aurora Solar:
  • Best For : High-volume residential and commercial solar installers.
  • Key Features : Highly accurate LIDAR-assisted 3D roof modeling, AI shade analysis, and built-in sales proposals.
• OpenSolar:
  • Best For : Startups, solo contractors, and small installers on a budget.
  • Key Features: Completely free core platform funded by hardware manufacturing partners. Includes interactive web proposals and full 3D modeling tools.
• Solargraf / Enphase Solargraf:
  • Best For : In-field sales reps and smaller installation teams.
  • Key Features : Streamlined CRM integration, fast proposal generation, and built-in options for backup battery configurations.

2. Commercial & Industrial (C&I) Systems

These tools prioritize quick string layout generation, complex electrical designs, and fast energy-yield estimations for larger, flat-roofed, or ground-mounted buildings.

• HelioScope:
  • Best For : Mid-to-large scale commercial and industrial projects.
  • Key Features : Rapid mechanical layouts, detailed electrical wiring/stringing design, single-line diagram (SLD) exports, and global weather data integration.
• PV*SOL Premium:
  • Best For : Engineering-heavy consulting and highly customized system architectures.
  • Key Features : Deep 3D visualization, detailed EV-charging and battery storage modeling, and an extensive component database.

3. Utility-Scale & Engineering Simulation (The "Bankable" Standards)

These highly analytical platforms are used for massive solar farms where investors demand hyper-precise calculations regarding terrain, degradation, and weather anomalies.

• PVsyst:
  • Best For : Independent engineers, developers, and financial analysts seeking "bankable" data.
  • Key Features : Industry-standard hourly and sub-hourly simulation models. It calculates micro-losses (shading, mismatch, wiring, thermal) with maximum mathematical depth.
• PVcase / RatedPower:
  • Best For : EPCs (Engineering, Procurement, and Construction) designing utility ground-mount systems.
  • Key Features : Direct integration into AutoCAD, terrain-following layouts, and automated civil engineering assessments for large-scale land grading.

Comparison of Key Features

If you want to test the waters without overhead, start with a free profile on OpenSolar . If your goal is scaling up a residential sales team, look into a demo with Aurora Solar.

To help me narrow down the best specific recommendation, tell me:

• What is your average project size ? (Residential roofs, commercial buildings, or utility land plots?)
• Do you need the software to generate customer sales proposals , or just pure engineering blueprints?
• What is your approximate monthly budget for software licensing?