Five tools dominate utility-scale solar design in 2026: PVcase, PVFARM, RatedPower (pvDesign), Helios 3D, and PVX. Each solves a different slice of the design problem. Some optimize for speed. Some optimize for terrain accuracy. Some run in the cloud. Some live inside AutoCAD.
This comparison exists because vendor marketing pages tell you what each tool does well. They do not tell you where each tool falls short. Engineers making purchasing decisions need both sides. Every claim in this post is sourced from public G2 reviews, published pricing, documented case studies, or direct product capabilities. Where data is unavailable, we say so.
The Five Tools at a Glance
PVcase is the market leader by adoption. 1,800+ customers across 80+ countries, a 4.5/5 G2 rating from 349+ reviews, and a plugin architecture that runs on both AutoCAD and BricsCAD. PVcase takes a layout-first approach: generate the panel arrangement, then analyze grading afterward. Its acquisition of Anderson Optimization added GIS-based site selection, making it the broadest feature set in the category.
PVFARM is a cloud-only platform that positions itself as the first AI-enabled solar design tool. It emphasizes grading optimization, cites NREL research, and claims 20-30% earthwork reduction. PVFARM won the Solar Power World 2025 Top Solar Software award. It runs entirely in the browser with no CAD integration.
RatedPower (pvDesign) is a cloud-native feasibility engine. It generates layouts, LCOE reports, and energy yield estimates in minutes. RatedPower excels at the developer prospecting stage, where you need fast answers across many candidate sites before committing engineering resources to any single one.
Helios 3D is a standalone professional planning tool built around TIN surfaces and detailed terrain modeling. It supports VR visualization and local grading analysis. At EUR 11,800/year with zero G2 reviews and a steep learning curve, it targets enterprise teams that need terrain depth and can absorb the onboarding cost.
PVX is an AutoCAD-native extension built on terrain-first methodology. Its two products, PVX.Cad (design inside AutoCAD) and PVX.View (analyze and share in a browser), cover detailed engineering through construction handoff. PVX introduces soil hardness classification, multi-scenario grading comparison, and cable topology optimization with per-string voltage drop. EUR 7,000/seat, 5.0/5 on G2 (4 reviews), 3.8 TWp designed to date.
Head-to-Head Comparison
| Feature | PVX | PVcase | PVFARM | RatedPower | Helios 3D |
|---|---|---|---|---|---|
| Platform | AutoCAD extension | AutoCAD + BricsCAD | Cloud | Cloud | Standalone |
| Terrain methodology | Terrain-first | Layout-first | Cloud-based | Simplified | TIN surfaces |
| Grading comparison | 3 approaches in minutes | Basic grading | Grading optimization | No | Local grading |
| Soil hardness classification | Yes (7-class) | No | No | No | No |
| Cable topology comparison | Line/U/Leapfrog | Basic routing | No | No | No |
| Voltage drop per string | Yes | No | No | No | No |
| PVsyst export | Clean, no orientation bugs | Orientation issues reported | Unknown | Unknown | Yes |
| Web viewer/sharing | PVX.View (browser) | No | Cloud-native | Cloud-native | VR (desktop only) |
| Site selection/GIS | No | Yes (Anderson Optimization) | Yes | Yes | No |
| Financial modeling | PVX.View (NPV/IRR) | PVcase Yield | Yes | Yes (LCOE) | No |
| Pricing | EUR 7,000/seat | Higher (not public) | Not public | Not public | EUR 11,800/seat |
| G2 rating | 5.0 (4 reviews) | 4.5 (349+ reviews) | N/A | N/A | N/A |
| Best for | EPC detailed engineering | Full lifecycle, large teams | Cloud-first teams | Developer prospecting | Enterprise terrain |
Deep Dive: Terrain and Grading
Terrain handling is where these five tools diverge most. The differences are not cosmetic. They determine earthwork volumes, construction costs, and whether a design survives the transition from screen to site.
PVcase uses a simplified terrain model. G2 reviews from verified users flag “inaccurate terrain analysis” as a recurring issue. The layout-first approach means grading is evaluated after panel placement, limiting the ability to optimize terrain before committing to a design.
PVFARM markets grading optimization aggressively, citing NREL research and 20-30% earthwork reduction claims. Because it runs in the cloud, it cannot work with native CAD terrain surfaces. Whether it produces IFC-grade grading outputs for construction is unclear from public documentation.
RatedPower does not offer grading analysis. Its terrain handling is simplified to support fast feasibility screening. This is appropriate for its use case (early-stage prospecting) but disqualifies it from detailed engineering work.
Helios 3D works with TIN surfaces and supports local grading analysis. This gives it genuine terrain depth. The tradeoff is that it requires Civil 3D, operates as a standalone application, and has a learning curve that limits adoption outside enterprise teams.
PVX analyzes the actual topographic surface before layout generation. It compares three grading approaches (full-terrain smoothing, row-restricted, pile-adaptive) on the same site in minutes. On a case study site with 44% hard rock and slopes reaching 40-45%, pile-adaptive grading reduced cut volume from 118,225 m3 to 34,819 m3. That is 70% less earthwork and $727K in cost savings. PVX also classifies soil hardness into 7 categories, so the grading plan accounts for rock, clay, and mixed substrates before a single cubic meter moves.
The key distinction: tools that analyze terrain after layout can tell you the cost of the design you already have. Tools that analyze terrain before layout let you choose the design that costs the least.
Deep Dive: Electrical Design and Cabling
Cable routing determines a significant share of BOS cost on large plants. The differences here are less visible than terrain but equally consequential.
PVcase routes cables, but G2 reviewers note that trench corridors can deviate from user-defined paths. Cable topology comparison (testing multiple routing strategies on the same plant) is a manual exercise.
PVFARM and RatedPower do not offer granular cable routing at the topology level. Their electrical outputs serve feasibility and yield estimation, not construction-grade cable BOMs.
Helios 3D does not include cable routing in its core platform.
PVX compares three cabling topologies (Line String, U String, Leapfrog) automatically across every DC combiner and transformer area. On a 130 MWp plant with 338 DC combiners and 26 transformer areas, the results were:
| Topology | Loop Length | Voltage Drop (4mm2) | Per-DCB CAPEX | Total CAPEX (130 MWp) |
|---|---|---|---|---|
| Line String | 191.86 m | 1.20% | $11,304 | $3,820,752 |
| U String | 181.37 m | 1.14% | $10,880 | $3,677,440 |
| Leapfrog | 165.85 m | 1.04% | $10,032 | $3,390,816 |
Leapfrog saved $430K and shortened cable runs by 14%. PVX calculates voltage drop per string, per cable cross-section. That level of detail lets the engineer select the topology and cable gauge combination that optimizes cost against electrical constraints, not guess at it.
Deep Dive: Workflow and Integration
Where a tool lives in your workflow matters as much as what it calculates.
AutoCAD-native tools (PVX, PVcase) keep engineers in their existing CAD environment. Survey data, civil drawings, and coordination sets stay in the same workspace. PVcase adds BricsCAD support, giving teams a choice of CAD platform. PVX is AutoCAD-only.
Cloud tools (PVFARM, RatedPower) trade CAD integration for accessibility. Anyone with a browser can run a design. This works well for distributed teams and developer-stage prospecting. The tradeoff: engineers producing IFC documents still need to move results into CAD. That handoff introduces translation risk.
Standalone tools (Helios 3D) require their own environment and, in Helios 3D’s case, Civil 3D. This creates a parallel workflow that must be reconciled with the project’s primary CAD environment.
Collaboration and review. Cloud tools (PVFARM, RatedPower) share designs natively since they are already in the browser. PVX addresses this with PVX.View, a browser-based viewer where non-CAD stakeholders can explore the 3D terrain model, cross-sections, and financial data without an AutoCAD license. PVcase and Helios 3D require file exports for stakeholder review.
PVsyst export. Clean PVsyst integration matters for yield modeling and bankability. PVcase users report orientation mismatches (portrait/landscape module confusion) that require manual cleanup. PVX and Helios 3D produce clean exports. PVFARM and RatedPower PVsyst export quality is not well documented publicly.
Which Tool for Which Use Case
No single tool is best for every scenario. The right choice depends on where you sit in the project lifecycle and what your terrain looks like.
Developer prospecting and early feasibility. RatedPower. It generates layouts, yield estimates, and LCOE reports in minutes across dozens of candidate sites. You do not need CAD precision at this stage. You need speed and breadth.
Cloud-first teams without CAD infrastructure. PVFARM. If your team does not use AutoCAD and you want an all-in-one cloud platform, PVFARM covers layout, grading optimization, and collaboration in the browser.
Large EPC teams with diverse site portfolios. PVcase. The broadest feature set, largest community, BricsCAD support, and Anderson Optimization for site selection make it the safe default for teams that prioritize ecosystem breadth over terrain depth.
Enterprise teams requiring standalone terrain planning. Helios 3D. If your workflow centers on Civil 3D, you need VR visualization, and your budget supports EUR 11,800/seat, Helios 3D provides genuine terrain depth in a standalone environment.
Detailed engineering on complex terrain. PVX. When earthwork and cabling costs are a significant budget line, when the site has slopes above 10% or mixed soil hardness, when you need construction-ready outputs that do not require field rework. The $727K earthwork savings and $430K cabling savings came from real projects, not simulations. PVX pays for itself on the first complex site.
Consider combining tools. Many teams use one tool for prospecting (RatedPower or PVFARM) and another for detailed engineering (PVX, PVcase, or Helios 3D). The tools are not mutually exclusive. The question is which combination matches your project mix.
Closing
The utility-scale solar design software market is maturing. Five years ago, the only question was “AutoCAD plugin or spreadsheet?” Today, teams choose between cloud platforms, standalone terrain engines, and CAD-native extensions, each optimized for a different part of the project lifecycle.
The honest answer is that no tool wins on every dimension. PVcase has the largest community and broadest features. PVFARM brings AI-driven grading to the cloud. RatedPower is the fastest path from site coordinates to feasibility report. Helios 3D offers deep terrain analysis for enterprise teams. PVX delivers the highest terrain and cabling precision for detailed engineering on complex sites.
Pick the tool that solves the problem you actually have. If that problem is “our grading estimates do not survive construction” or “we cannot compare cabling topologies without weeks of manual work,” PVX was built for exactly that.
The fastest way to evaluate is a 30-minute technical demo using your own project files. No generic slide deck. Your terrain, your constraints, your numbers. Book a demo at pvx.ai/demo.