You spend hours building a solar proposal only to find out mid-install that the shading analysis was off, the panel layout doesn’t match the actual roof, or the customer’s savings projections were based on outdated utility rates. The rework costs you time. The change orders cost you money. And the homeowner starts questioning whether you know what you’re doing.
That’s the reality for solar companies still designing systems with spreadsheets, generic CAD tools, or software that hasn’t kept pace with how the industry actually works in 2026. The right solar design software eliminates most of those problems before your crew ever touches a ladder — but “right” depends entirely on whether you’re designing residential rooftops, commercial arrays, or utility-scale farms.
Below, we compare ten of the most widely used solar design platforms in 2026, organized by the use case each one handles best. We include actual pricing where it’s publicly available, G2 ratings, honest trade-offs, and a side-by-side comparison table so you can stop guessing and start evaluating.
What Is Solar Design Software?
Solar design software helps solar professionals plan, model, and optimize photovoltaic (PV) systems before installation begins. At a basic level, these tools let you place panels on a roof or site map, run shading analysis, estimate energy production, and generate customer-facing proposals.
Most modern platforms go further. The best tools in 2026 include AI-assisted panel placement that detects roof obstructions automatically, LiDAR-based 3D modeling, financial analysis with real utility rate data, battery storage sizing, and automated permit package generation. Some function as a full solar CRM with integrated design, handling everything from lead capture through contract signing.
The practical difference between a good tool and a bad one usually comes down to three things: how accurate the energy yield estimates are, how fast you can go from address to proposal, and whether the output is bankable enough to satisfy lenders and inspectors.
How to Choose Solar Design Software
Not every tool fits every business. A two-person residential installer in Texas has completely different needs than a utility-scale developer designing 100 MW ground-mount farms across multiple states. Before comparing features, start with your use case.
Residential vs. Commercial vs. Utility-Scale
Residential installers need speed — fast roof modeling, automatic panel placement, polished proposals, and integrated financing options that let reps close on the spot. Tools like Aurora Solar and Solargraf are built for this workflow.
Commercial and industrial (C&I) teams need bankable accuracy. Energy yield estimates have to hold up under lender scrutiny, and designs often involve carports, flat roofs, or multi-building arrays. HelioScope and PV*SOL are stronger here.
Utility-scale developers need terrain modeling, tracker configuration, automated electrical design, and the ability to compare dozens of layout scenarios quickly. PVcase, PVsyst, and RatedPower own this segment.
Key Features to Evaluate
- 3D modeling and shading analysis — How does the tool handle obstructions, tree growth, and horizon shading? Does it use LiDAR or satellite imagery?
- AI layout automation — Can it detect roof keep-outs and place panels automatically, or is every layout manual?
- Financial modeling — Does it support current rate structures (including NEM 3.0 in California), TPO/PPA/lease models, and real-time savings projections? With the Section 25D residential tax credit expired at the end of 2025, tools that model third-party ownership scenarios are more valuable than ever.
- Battery storage design — With storage attached to over 40% of U.S. residential installs by mid-2025 (per Aurora Solar’s 2026 Snapshot), this is no longer optional.
- Proposal generation — Does the tool produce customer-ready proposals, or do you need a separate tool for that?
- Permit package output — Can it generate NEC-compliant plan sets with electrical diagrams, or does that require additional software?
Pricing Models in 2026
The pricing landscape has shifted. Three models dominate:
- Monthly/annual subscription — Predictable cost, best for high-volume teams. Aurora, HelioScope, and Solargraf use this model.
- Per-project credits — You pay per design. Aurora also offers this, and it can get expensive at scale.
- Free with monetized partnerships — OpenSolar remains free by earning revenue through integrated hardware and financing partners.
Pro tip: Most platforms offer a free trial. Use it on a project you’ve already completed so you can compare the software’s estimates against real-world production data. That’s the only way to know if the tool’s accuracy claims hold up in your market.
Best Solar Design Software for Residential Installers
Aurora Solar
G2 Rating: 4.7/5
Pricing: Subscription tiers starting around $159/month; credit-based options available for per-project pricing
Aurora is the most widely used residential solar design platform in the U.S. Its AI roof modeling generates a 3D model in under 15 seconds using HD imagery and LiDAR, automatically detecting vents, chimneys, and other obstructions. The proposal engine is strong — installers regularly cite it as a factor in higher close rates — and integrated financing through partners like Sungage lets reps present loan and lease options on the spot.
- Aurora AI generates 3D roof models in seconds with automatic obstruction detection
- Sales Mode produces interactive, branded proposals with integrated financing
- Remote site assessment eliminates most physical site visits
- E-signature contracts allow same-appointment closing
- Storage modeling supports battery sizing with real rate structure data
Watch out for: Aurora’s calculations tend to be conservative, which some users find frustrating for optimistic proposals. The credit-based pricing model can also become expensive if you’re scaling from 10 to 100+ projects per month. Commercial project support is more limited than dedicated C&I tools.
OpenSolar
G2 Rating: 4.8/5
Pricing: Free — no licensing fees, seat limits, or design caps
OpenSolar is the rare platform that’s genuinely free without sacrificing core functionality. Version 3.0, released in late 2025, expanded it from a design tool into a full solar CRM with integrated design, pipeline management, and proposal generation. It monetizes through hardware and financing partnerships rather than user subscriptions.
- High-resolution 3D modeling with shading analysis and performance simulation
- Integrated CRM for lead tracking, follow-ups, and pipeline management
- Customizable proposals with financial analysis and incentive calculations
- No design caps — unlimited projects across your team
- Cloud-based collaboration for distributed teams
Watch out for: The G2 review sample is tiny (3 reviews as of March 30, 2026), which makes the rating hard to trust at scale. The “free” model means OpenSolar’s roadmap is partially driven by partner integrations rather than purely user needs. Starting April 2026, charges apply for API access and third-party connectors.
Solargraf
G2 Rating: 4.4/5
Pricing: Annual plans starting around $2,799; project-based credits also available
Solargraf, owned by Enphase Energy since 2021, is built for speed — the company claims 3-minute proposal generation, which is among the fastest in the category. It works particularly well for Enphase-only shops because of deep integration with the Enphase ecosystem, including Enlighten monitoring data. NEM 3.0 support with pre-built CPUC hourly rate tables is a genuine differentiator for California installers.
- 3-minute proposals with auto roofline detection and HD imagery
- Enphase integration validates designs against Enlighten system data
- NEM 3.0 support with California-specific hourly sell rates
- Battery storage design across 25+ manufacturers
- Permit plan sets with engineering stamps from an in-house team of 200+ experts
Watch out for: G2 rating based on a very small sample size (4 reviews as of March 30, 2026). Shading accuracy is the most common complaint in user reviews. Multiple Capterra reviewers report production estimates that are 10–20% off compared to Aurora or HelioScope, requiring cross-verification with a second tool. The permit packages also have a high revision rate according to user feedback. If shading precision matters to your business, test carefully before committing.
Best Solar Design Software for Commercial Projects
HelioScope
G2 Rating: 4.5/5
Pricing: Basic plan at $159/month ($1,620/year); Pro plan at $259/month; Enterprise pricing available
HelioScope, developed by Folsom Labs and acquired by Aurora Solar in 2021, is positioned as Aurora’s commercial and industrial counterpart. It’s a web-based platform built for the 100 kW to 5 MW sweet spot where speed, accuracy, and bankability all matter. Its energy yield calculations are validated by DNV GL to be within 1% of PVsyst when assumptions align — a critical detail for projects that need lender-grade reports.
- Bankable energy simulations validated within 1% of PVsyst by DNV GL
- Flexible system modeling for rooftop, carport, and ground-mount arrays in the same project
- Component library with 50,000+ modules and inverters
- Row-to-row shading analysis with detailed obstruction and horizon modeling
- Financial calculator and drag-and-drop proposal editor
Watch out for: HelioScope’s proposal capabilities are functional but not as polished as Aurora’s or dedicated sales tools. For complete electrical documentation (single-line diagrams, NEC-compliant schematics), you’ll likely need AutoCAD as a companion tool, adding roughly $2,000/year. It’s an engineering tool first, sales tool second.
PV*SOL
G2 Rating: 4.2/5
Pricing: License-based — PVSOL 2025 at €585/year; PVSOL Premium at €845/year (plus VAT)
PV*SOL is a desktop simulation tool favored by engineers, architects, and designers who need deep analytical capabilities for both residential and commercial systems. It excels at complex shading scenarios — think multi-story buildings with neighboring structures, trees, and irregular roof geometries — and includes robust battery storage integration for hybrid system design.
- Advanced shading simulation for complex multi-building environments
- Battery storage planning with detailed charge/discharge modeling
- Comprehensive financial analysis including ROI and payback calculations
- Extensive component database for accurate system sizing
- Weather data integration with location-specific irradiance data
Watch out for: PV*SOL is desktop software (Windows), not cloud-based, which limits collaboration and mobile access. The interface can feel dated compared to web-native tools. It’s a simulation and analysis tool, not a sales platform — you’ll need separate software for proposals and customer-facing materials.
Best Solar Design Software for Utility-Scale Projects
This is the segment with the highest-stakes decisions and the most specialized tools. If you’re designing ground-mount systems above 5 MW, residential-focused platforms won’t cut it.
PVcase Ground Mount
G2 Rating: 4.7/5 — Winner of G2’s 2025 Best CAD Software award
Pricing: Subscription-based; contact vendor
PVcase is the market leader in utility-scale solar design by adoption, with 1,800+ customers across 80+ countries. It runs as an AutoCAD and BricsCAD plugin, which means it fits directly into existing engineering workflows. The platform automates layout generation, electrical stringing, and cable routing, with users reporting 60–70% reductions in design time compared to manual CAD methods.
- AutoCAD/BricsCAD integration for professional engineering workflows
- Automated stringing and cable routing with electrical design tools
- Hourly shading simulation across 365 days (~8,760 calculations per year)
- Layout comparison for evaluating multiple design scenarios side by side
- PVsyst export for detailed yield analysis and bankable reporting
Watch out for: G2 reviewers flag terrain analysis accuracy as a recurring issue — PVcase uses a simplified terrain model that evaluates grading after panel placement rather than before. Cable routing can also deviate from user-defined paths in some cases. If terrain complexity is your primary concern, evaluate carefully against alternatives.
PVsyst
G2 Rating: 4.6/5
Pricing: License-based with commercial and academic tiers; approximately CHF 650/year for a single-seat commercial license
PVsyst is the industry standard for bankable energy yield analysis. Developed since 1992, it’s the simulation tool that lenders, investors, and independent engineers require for projects above 1 MW. Its loss tree analysis — breaking down every source of energy loss from temperature to soiling to cable resistance — provides the transparency that financing decisions depend on.
- P50/P75/P90 yield estimates with Monte Carlo analysis for project finance
- Comprehensive loss modeling across temperature, mismatch, soiling, cable, inverter, and degradation
- Extensive meteorological database with 30+ years of irradiance data
- Grid-connected, stand-alone, and pumping system support
- Multi-configuration comparison for layout optimization
Watch out for: PVsyst is simulation-only — it does not design layouts, generate proposals, or produce permit packages. It’s Windows desktop software with a steep learning curve (plan for 4–6 weeks of onboarding). Most teams use PVsyst alongside a layout tool like PVcase or RatedPower, not as a standalone solution. The interface is functional but dated.
RatedPower
G2 Rating: 4.4/5 — G2’s Most Implementable Leader for Solar Design
Pricing: Tiered subscription plans; contact vendor. Includes unlimited projects, users, and designs on all plans.
RatedPower, now part of Enverus, is a cloud-based platform purpose-built for utility-scale solar, standalone battery storage (BESS), and hybrid systems. It covers the full development cycle from site prospecting through detailed engineering. Where PVsyst excels at simulation accuracy, RatedPower excels at speed — it can generate multiple design iterations in minutes, allowing developers to compare dozens of scenarios before committing to detailed engineering.
- Batch design simulation — create up to 10 layout variations simultaneously with different GCR or DC/AC ratios
- Automated engineering documentation including SLDs, Gen-Tie reports, and bills of materials
- AC-coupled BESS integration for hybrid solar-plus-storage projects
- Layout editor for manual fine-tuning after automated generation
- DWG export for seamless AutoCAD integration in later engineering phases
Watch out for: RatedPower uses a simplified terrain model — it’s fast for feasibility and prospecting but doesn’t match the grading detail of CAD-based tools. As one G2 reviewer put it, it’s “too technical for non-technical personnel, too few technical for technically skilled workers,” suggesting it sits in an awkward middle for some teams. Pricing is described as expensive by some users.
Best Free Solar Design Software
If you’re a small installer or just starting out, paid licenses may not make financial sense yet. These options let you design and propose without subscription costs.
OpenSolar remains the strongest free option — fully featured with no design caps or seat limits. See the residential section above for the full breakdown.
Pylon uses a pay-as-you-go model with no monthly subscription. It combines design, shading analysis, and proposal generation with high-resolution imagery included at no extra monthly cost. Best for small teams that want to avoid subscription lock-in. G2 rating: 4.3/5 (2 reviews — very small sample).
ARKA 360 offers a tiered pricing structure with options for smaller businesses. Its AI-assisted panel placement and integrated permit package generation (including PE stamps) make it a strong choice for residential installers who need speed. G2 rating: 4.4/5 (85 reviews).
Solar Design Software Comparison
| Tool | Best For | G2 Rating | Pricing | Proposals | Storage Design | Cloud-Based |
|---|---|---|---|---|---|---|
| Aurora Solar | Residential sales | 4.7/5 | ~$159/mo+ | Yes | Yes | Yes |
| OpenSolar | Budget-conscious teams | 4.6/5 | Free | Yes | Yes | Yes |
| Solargraf | Enphase installers | ~3.5/5 | ~$2,799/yr | Yes | Yes | Yes |
| HelioScope | Commercial C&I | 4.5/5 | $159–259/mo | Limited | No | Yes |
| PV*SOL | Engineering analysis | 4.3/5 | €585–845/yr | No | Yes | No (Desktop) |
| PVcase | Utility-scale layout | 4.5/5 | Contact vendor | No | No | No (AutoCAD) |
| PVsyst | Bankable simulation | 4.7/5 | ~CHF 650/yr | No | No | No (Desktop) |
| RatedPower | Utility-scale feasibility | 4.4/5 | Contact vendor | Limited | Yes (BESS) | Yes |
| Pylon | Small installers | 4.3/5 | Pay-as-you-go | Yes | Yes | Yes |
| ARKA 360 | Residential + permits | 4.4/5 | Tiered plans | Yes | Yes | Yes |
Frequently Asked Questions
OpenSolar is the most full-featured free option in 2026, offering 3D modeling, shading analysis, proposal generation, and CRM tools with no licensing fees or design caps. It monetizes through hardware and financing partnerships instead of user subscriptions. Pylon’s pay-as-you-go model is another low-cost alternative that avoids monthly subscription commitments.
Aurora Solar is the most widely adopted platform for residential solar design in the U.S., powering thousands of projects per week. For commercial and industrial projects, HelioScope (also owned by Aurora) is the go-to tool. At the utility scale, PVcase leads in market adoption with 1,800+ customers across 80+ countries, while PVsyst remains the standard for bankable yield analysis.
Yes, but only tools built for that scale. PVcase, PVsyst, and RatedPower are the three primary platforms for utility-scale work. PVcase handles layout and electrical design, PVsyst provides bankable energy yield simulation, and RatedPower covers feasibility through preliminary engineering. Most utility-scale teams use two or more of these tools together rather than relying on one.
Costs range from free (OpenSolar) to several hundred dollars per month. HelioScope starts at $159/month, Aurora Solar at roughly $159/month for basic tiers, and PV*SOL at €585–€845/year. Utility-scale tools like PVcase and RatedPower use custom pricing. Some platforms also use per-project credit models that scale with volume. Always factor in companion tools — PVsyst users, for example, typically also need AutoCAD ($2,000/year) for complete workflows.
Yes, meaningfully. Aurora’s AI generates 3D roof models in under 15 seconds with automatic obstruction detection. ARKA 360 uses AI-assisted panel placement to optimize layouts. At the utility scale, RatedPower’s automated batch simulations generate multiple design scenarios in minutes. AI in this space is focused on speed and accuracy, particularly in reducing the manual work of roof measurement, shading calculation, and initial layout generation.
Pick the Tool That Matches Your Workflow
The best solar design software is the one that matches how your team actually works. Residential sales teams that close at the kitchen table need Aurora’s speed and proposal polish. Commercial engineers who answer to lenders need HelioScope’s bankable simulations. Utility-scale developers comparing 50 layout variations need RatedPower’s batch processing and PVsyst’s yield validation.
Start with your use case, test on a project you already know the real-world numbers for, and pay close attention to where each tool’s estimates diverge from reality. That’s where the real evaluation happens.
