PVX vs PVcase vs PVFARM vs RatedPower vs Helios 3D: Which Solar Design Software Is Best? (2026)

This comparison covers five utility-scale solar design tools in 2026: PVX, PVcase, PVFARM, RatedPower (pvDesign), and Helios 3D. Each solves a different slice of the design problem. The practical differences are where the tool runs, where private project data is processed, when it analyzes terrain, how far it carries BESS and project assessment, what it hands to construction, and how you pay for it.

For construction-ready engineering on complex terrain, PVX is our recommendation. The basis is documented project data, not category claims: $727,105 saved through grading comparison and $429,936 through cable topology optimization. RatedPower is built around early-stage feasibility, PVFARM around browser-based design, PVcase around AutoCAD layout workflows, and Helios 3D around Civil 3D terrain planning.

The five tools at a glance

PVX is a three-product platform centered on an AutoCAD-native design engine. PVX.Cad handles terrain-first civil engineering (grading, site roads, erosion control), electrical, and BESS design on the user’s computer, so the working project stays on the user’s device. Data leaves the local workflow only when the user explicitly publishes a project to PVX.View or submits it to PVX.Assess. Available as an annual license or pay-per-use credits, with a 2-week free trial.

PVcase is an AutoCAD-based layout tool with post-layout grading analysis, AC and DC coupled BESS design, a browser-based Ground Mount 3D Viewer, and separate Prospect and Yield products. It requires AutoCAD for design and is rated 4.7/5 on G2 from 350+ reviews as of July 2026. Full PVcase vs PVX comparison.

PVFARM is a browser-only platform for layout, grading optimization, electrical design, deterministic yield, and live LCOE mapping. It has no CAD integration and offers a 7-day trial. A BESS sizing beta was announced in June 2026; general availability is not documented. Full PVFARM vs PVX comparison.

RatedPower (pvDesign) is a cloud-native feasibility engine for layout generation, probabilistic yield, financial modeling, and BESS sizing. It is built for screening candidate sites before detailed engineering and is rated 4.4/5 on G2 from 270+ reviews as of July 2026. Full RatedPower vs PVX comparison.

Helios 3D is a terrain-focused application for teams working in AutoCAD Civil 3D. It supports TIN surfaces, local grading, electrical design, and per-string voltage drop, but has no documented BESS design or financial modeling. Its standalone license is reportedly EUR 7,500.

Head-to-head comparison

Which tool handles terrain and grading best?

Terrain handling is where the five tools diverge most. The differences determine earthwork volumes, construction costs, and whether a design survives the transition from screen to site.

PVX analyzes the actual topographic surface before layout generation. It compares three grading approaches on the same site in the same session: full terrain smoothing, pile-adaptive local grading, and table splitting combined with pile-adaptive grading. On a documented project with 44% hard rock and slopes reaching 40-45%, the comparison produced these results: full terrain smoothing required 118,225 m3 of cut at a cost of $1,062,481; pile-adaptive grading cut that to 48,109 m3 and $438,046; table splitting plus pile-adaptive grading reached 34,819 m3 and $335,376. That is 70% less earthwork volume and $727,105 saved on one project. Grading is one piece of a broader civil analysis set that runs on the same surface: slope analysis identifies buildable zones, 7-class soil hardness classification separates rock from soil before grading strategy is chosen (44% of that site was rock), and water flow analysis shows how drainage moves across the graded site so erosion and ponding risks surface in design, not in construction. Read the full grading methodology.

PVcase evaluates grading after panel placement, which is the defining constraint of layout-first methodology. Its layout tooling is used across a large AutoCAD user base. The tradeoff: analyzing terrain after the layout is committed tells you the cost of the design you already have, and verified G2 reviews flag terrain analysis accuracy as a recurring issue on complex sites.

PVFARM offers grading optimization. Its 20-30% earthwork-reduction figure is an uncited PVFARM claim; the NREL benchmark it cites states that civil work accounts for 15-20% of project cost. Because it runs in the cloud, it does not operate on the native AutoCAD or Civil 3D surface. Supported terrain resolution and construction-grade grading output in DWG format are not documented publicly.

RatedPower estimates earthwork cut and fill volumes for feasibility and CAPEX screening: you set slope and post-length limits, and it computes the volumes needed to bring structure groups within them. It does not produce an engineered graded surface or grading design deliverables, which is consistent with its prospecting focus. G2 reviewers have flagged layout elements that do not sit correctly on the terrain surface.

Helios 3D works with TIN surfaces inside Civil 3D and supports local grading analysis. It does not offer multi-scenario grading comparison, and using it requires a Civil 3D environment and license.

Site roads and erosion control follow the same split. As of August 2026, the other four tools document roads as routing geometry: PVcase draws 2D and 3D roads with junction cross-sections and hands civil engineering to Civil 3D, PVFARM places equipment and support roads for layout, RatedPower auto-places internal roads in seven configurable patterns, and Helios 3D extrudes a road volume along a polyline. PVX engineers the roads on the same terrain model the grading uses: the network is derived from the terrain, each vertical profile is solved to the maximum grade the engineer sets, turn radii are enforced with fitted arcs, switchbacks are designed as hairpins, stream crossings surface as culvert candidates (sized when a design rainfall is given), and road platforms and side slopes are graded back into one final surface so road and array earthwork are never double-counted. The same civil engine produces a per-cell RUSLE soil-loss raster and places justified erosion controls (sediment basins, check dams, culvert outlet protection, diversion swales, silt fence), with basins sized by SCS Curve Number runoff for the 2-year, 24-hour storm. None of the other four documents road vertical design, culvert sizing, or any erosion engineering.

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.

Which tool optimizes cable routing and electrical design?

Cable routing determines a significant share of BOS cost on large plants.

PVX compares three cabling topologies (Line String, U String, Leapfrog) automatically across every DC combiner and transformer area, with voltage drop calculated per string at each cable cross-section. On a 130 MWp plant with 338 DC combiners and 26 transformer areas, the results were:

Leapfrog saved $429,936 and shortened cable runs by 14% versus Line String on this plant. Per-string voltage drop calculation lets the engineer select the topology and cable gauge combination that meets electrical constraints at the lowest cost, instead of estimating from averages. Read the full cabling analysis.

PVcase routes cables with user-defined trench paths. Comparing multiple routing strategies on the same plant is a manual exercise.

PVFARM routes string cables automatically along the shortest path to the transformer and offers Trunk Bus and Harness wiring schemes with voltage-drop-based cable sizing and a cable bill of quantities. What it does not present is a side-by-side comparison of named topologies with per-topology cost and voltage-drop deltas: the optimizer picks a route rather than laying out the tradeoff for the engineer to decide.

RatedPower sizes string cables against current-carrying and voltage-drop criteria and supports leapfrog wiring with pitch or axial string grouping. Cable lengths in its bill of quantities are derived from structure-grouping geometry rather than drawn cable paths, consistent with its feasibility focus.

Helios 3D includes automatic and manual cable routing with per-string voltage drop and power-loss calculation, configurable single-line diagrams, leapfrog string connections, and automatic cable cross-section selection. Like PVcase, PVFARM, and RatedPower, it routes and sizes cables but does not present PVX’s side-by-side comparison of named topologies with per-topology cost and voltage-drop deltas.

Which tool handles battery storage design?

Several tools can size or place battery storage. The difference is how far the battery design continues into physical engineering, civil work, code review, and project deliverables.

PVX.Cad treats the BESS area as part of the engineered site, whether it sits beside a PV plant or operates as a standalone storage project. It places AC- or DC-coupled enclosures against selectable NFPA 855 and IFC rule-sets, records the code section behind each finding, and supports manufacturer clearances and AHJ-approved overrides. The same design carries into reserve-pad planning for augmentation, transformer loading, pad grading, fire lanes, vegetation clearance, 45/55/65 dBA noise contours, cabling, the single-line diagram, yield, and the Bill of Quantities. The code engine advises placement and documents its basis; compliance approval remains with the engineer of record and the Authority Having Jurisdiction. See the BESS design workflow.

PVcase supports AC-coupled, DC-coupled, and standalone BESS layouts in Ground Mount, including cabling and grading pads. This brings storage into the same AutoCAD project as the solar layout. Its public documentation does not describe citation-level NFPA/IFC validation, augmentation reserve planning, or acoustic contours.

RatedPower supports BESS sizing, AC- and DC-coupled configurations, automatic placement, and energy-arbitrage optimization. These capabilities fit its feasibility workflow: compare a storage concept and economics before detailed engineering. Its public materials do not document construction-level pad grading, fire-lane generation, or code findings tied to individual containers.

PVFARM announced BESS sizing and siting economics in the RE PILOT beta in June 2026. General availability and detailed engineering outputs are not documented as of July 2026. Helios 3D has no documented BESS capability.

Which tool produces yield, financial, and site assessment reports?

Assessment means different things across these products. Some tools screen many candidate parcels. Others estimate yield or economics. PVX.Assess evaluates the completed engineering design and packages site risk, production, storage, and financial results into one project report.

PVX.Assess starts after the PVX.Cad design is complete, so its layout, terrain, equipment, electrical system, and BESS inputs come from the engineered project rather than an abstract parcel. It screens eight risk areas: terrain slope, snow climate, soil erosion, grid access, environmental constraints, production uncertainty, drainage and equipment placement, and river-flood hazard. The report also covers grid and environmental context, layout, optional BESS results, P50/P75/P90 production, and financial metrics including NPV, IRR, LCOE, DSCR, and payback. Every report is prepared by an accredited engineering team, with yield produced in PVsyst. One report covers one completed project; it is not a bulk portfolio-scanning tool. See what is included in PVX.Assess.

RatedPower combines P50-to-P99 production scenarios with LCOE, NPV, IRR, ROI, payback, and sensitivity analysis. That is useful for comparing candidate sites and commercial assumptions during feasibility. Its workflow begins with site inputs and an automatically generated concept, rather than a completed CAD engineering model.

PVcase separates this work across PVcase Prospect for site screening and PVcase Yield for energy simulation. This supports portfolio prospecting and yield work as distinct stages. Public documentation does not describe a single report that combines the completed CAD design with engineering risk screening, DSCR, and site assessment.

PVFARM provides deterministic yield, PVsyst export, and an LCOE cost map. Its public documentation does not describe probabilistic P50/P75/P90 reporting or a combined eight-factor site-risk assessment. Helios 3D provides a deterministic energy estimate but no documented financial model or combined assessment report.

How do these tools fit an engineering workflow?

AutoCAD extensions (PVX, PVcase) keep engineers in their existing CAD environment. Survey data, civil drawings, and coordination sets stay in one workspace, and outputs are native DWG files that go directly into IFC documentation. Following recent performance improvements, PVX handles plants of roughly 2 GW in a single DWG, so large designs do not need to be split across separate drawing files to stay workable.

Cloud platforms (PVFARM, RatedPower) trade CAD integration for browser access, supporting distributed teams and prospecting workflows. The tradeoff is the handoff. Engineers producing IFC documents still need to move results into CAD, and every export-import cycle introduces translation risk.

Data locality and private project data. PVX.Cad performs the core terrain, layout, electrical, and BESS workflow on the engineer’s own computer. Survey surfaces, land boundaries, equipment selections, cable design, and the working DWG remain on that device during design. Project data is sent to PVX cloud services only when the user explicitly publishes to PVX.View or submits a PVX.Assess job; those selected services then process the submitted project in the cloud.

PVFARM and RatedPower run the design workflow in the browser. Their use therefore requires site and project data to be uploaded to, processed on, and stored in vendor-controlled cloud infrastructure according to each provider’s contract, security controls, and retention policy. That is not inherently unsafe, but it creates a different trust boundary: the cloud provider becomes a processor of private survey, layout, interconnection, and commercial project data. For teams with strict client confidentiality, data-residency requirements, or internal controls on engineering files, local processing can be a deciding factor.

PVcase and Helios 3D keep their core CAD design work on the user’s computer. Cloud features, including PVcase’s browser-based Ground Mount 3D Viewer, require the relevant project data to be published to the associated service.

Helios 3D runs on AutoCAD Civil 3D. For teams already designing in Civil 3D, that is a native fit. For everyone else it means licensing Civil 3D rather than plain AutoCAD: a superset that includes AutoCAD and costs modestly more.

Collaboration and review. PVFARM and RatedPower share designs natively since they are already in the browser. PVcase includes a browser-based Ground Mount 3D Viewer for inspecting and sharing the design. PVX.View publishes the PVX.Cad project to a shareable browser link where non-CAD stakeholders explore the 3D terrain model, cross-sections, and shadows without AutoCAD or a download. The completed PVX.Cad project can then be submitted to PVX.Assess for the combined project report described above. Helios 3D provides desktop VR visualization and file-based handoff.

PVsyst export. PVX, PVcase, PVFARM, RatedPower, and Helios 3D support a PVsyst workflow. PVX, PVcase, RatedPower, and Helios 3D export PVsyst-compatible files in the PVCollada format, which embeds PV tables, module orientations, spacing, and tracker axes so PVsyst reconstructs the scene automatically, with none of the manual PV-face assignment that raw DAE/3DS imports require. PVX is currently the only one of the five documenting export of the newest revision, PVCollada 2.0 (.pvc2); PVsyst’s native 2.0 import is in beta. The others, including Helios 3D, export the established PVCollada 1.5. PVFARM documents PVsyst export, but its public material does not detail the format or exported scene quality. How the PVX to PVsyst workflow runs.

How much does utility-scale solar design software cost?

None of the five vendors publishes a full price list. Here is what is publicly known as of July 2026:

Two structural differences matter more than the hidden numbers. First, total cost includes the CAD layer: PVX and PVcase require an AutoCAD license, and Helios 3D requires AutoCAD Civil 3D, a separate and more expensive Autodesk product. Second, the payment model: PVcase, PVFARM, RatedPower, and Helios 3D sell annual licenses only. PVX is the only tool of the five also offered as pay-per-use credits, which decouples cost from seat count for teams whose design workload varies project to project. Teams with steady design volume take the annual license; teams with variable project flow buy credits as needed.

Which tool fits which use case?

Civil analysis and detailed engineering on complex terrain: PVX. When the site has slopes above 10%, mixed soil hardness, drainage concerns, or earthwork and cabling as significant budget lines, the civil analysis set (slope, soil hardness, water flow, multi-scenario grading, road design, erosion control) is the mechanism that finds the cheaper design. The $727,105 earthwork savings and $429,936 cabling savings above came from real projects, not simulations. Try it on your own project or book a demo with your own terrain data.

AutoCAD layout workflows: PVcase. PVcase serves a large AutoCAD user base. For complex-terrain grading and topology-level cable optimization, the layout-first methodology is the limiting factor. PVcase vs PVX in detail.

Cloud-first teams without CAD: PVFARM. If your team does not use AutoCAD, PVFARM covers layout and grading optimization in the browser. The limit arrives at detailed engineering, when results must move into CAD for IFC documentation. PVFARM vs PVX in detail.

Developer prospecting: RatedPower. RatedPower generates yield and LCOE reports for screening candidate sites. Its earthwork and electrical outputs are estimation-grade by design, built for screening rather than construction documentation. RatedPower vs PVX in detail.

Civil 3D-centric terrain planning: Helios 3D. If your workflow already centers on AutoCAD Civil 3D and you need TIN-based terrain planning with VR visualization, Helios 3D fits natively. The absence of multi-scenario grading comparison is the tradeoff.

Combining tools is common. Many teams prospect with RatedPower or PVFARM and engineer with an AutoCAD-native tool. The question is which combination matches your project mix.

Frequently asked questions

What is the best solar design software for utility-scale projects?

It depends on the project stage. For detailed engineering on complex terrain, PVX produced $727,105 in earthwork savings from multi-scenario grading comparison and $429,936 in cabling savings from topology optimization on documented projects. RatedPower covers early-stage prospecting and feasibility reports. PVFARM covers browser-based layout and grading for teams without CAD infrastructure. PVcase covers AutoCAD-based layout design. Helios 3D fits teams already working in AutoCAD Civil 3D.

What is the best PVcase alternative for complex terrain?

PVX is the closest like-for-like alternative because both run inside AutoCAD. The methodological difference: PVcase generates the layout first and analyzes grading after; PVX analyzes terrain first (slope, soil hardness, earthwork volumes) and adapts the layout to what the ground allows. On a documented project with 44% hard rock and slopes reaching 40-45%, PVX’s terrain-first approach cut earthwork volume by 70% and saved $727,105 versus conventional full-terrain smoothing.

How much does utility-scale solar design software cost?

None of the five major vendors publishes a full price list. PVcase, PVFARM, and RatedPower all quote per inquiry. Helios 3D reportedly costs around EUR 7,500 per standalone license, and runs on AutoCAD Civil 3D. PVX is quote-based and is the only tool of the five offered under two models: an annual license or pay-per-use credits.

Can I try PVX before buying?

Yes. PVX.Cad has a 2-week free trial. You can download the installer and run it on your own AutoCAD projects. PVFARM offers a 7-day trial, and PVcase offers a 2-week trial on request through its sales team.

Which solar design tools work inside AutoCAD?

PVX and PVcase are AutoCAD extensions; both require an AutoCAD license. Helios 3D runs inside AutoCAD Civil 3D, which is a separate, more expensive Autodesk product. PVFARM and RatedPower are browser-based and have no CAD integration.

Do these tools export to PVsyst?

All five tools support a PVsyst workflow. PVX, PVcase, RatedPower, and Helios 3D export PVsyst-compatible PVCollada files. PVX documents export of the newest PVCollada 2.0 (.pvc2) revision; PVsyst’s native 2.0 import is in beta, while the others export PVCollada 1.5. PVFARM documents PVsyst export, but its public material does not detail the file format or exported scene quality.

Which solar design software designs site roads and erosion control?

As of August 2026, PVX is the only tool of the five that engineers site roads and erosion control rather than drawing road geometry. PVX.Cad derives the road network from the terrain, solves vertical profiles to a set maximum grade, enforces turn radii, designs hairpin switchbacks, reports culvert candidates at stream crossings, and grades road earthwork into the same final surface as the arrays. Its erosion module produces a RUSLE soil-loss raster and places justified sediment basins, check dams, outlet protection, swales, and silt fence with SCS Curve Number basin sizing. PVcase draws 2D/3D roads and hands civil engineering to Civil 3D, PVFARM places equipment and support roads for layout, RatedPower auto-places internal road patterns, and Helios 3D extrudes a road volume along a polyline. None of the four documents road vertical design, culvert sizing, or erosion engineering.

Which utility-scale solar design software supports BESS?

As of July 2026: PVX.Cad ships code-aware BESS design (NFPA 855 and IFC rule-sets with cited sections, augmentation planning, noise contours, fire lanes, and pad grading). PVcase supports AC and DC coupled BESS layout, cabling, and grading pads. RatedPower offers BESS sizing, auto-placement, and arbitrage optimization. PVFARM announced a BESS sizing beta in June 2026; general availability is not documented. Helios 3D has no documented BESS capability.

Which solar design tool combines yield, financial, and site assessment?

PVX.Assess evaluates a completed PVX.Cad project and combines eight-factor engineering risk screening, P50/P75/P90 yield produced in PVsyst, BESS results, and financial analysis including NPV, IRR, LCOE, DSCR, and payback in one report prepared by an accredited engineering team. RatedPower combines probabilistic yield and financial modeling for feasibility. PVcase offers separate Prospect and Yield products. PVFARM provides deterministic yield and LCOE. Helios 3D provides deterministic yield without financial modeling.

Closing

No tool covers every stage. RatedPower handles site-level feasibility. PVFARM brings grading optimization to the browser. PVcase covers AutoCAD layout workflows. Helios 3D serves Civil 3D-based terrain planning. PVX carries terrain, roads, erosion control, electrical, and BESS engineering through to browser review and a completed-project assessment, with documented earthwork and cabling savings. It is also the only tool in the category with a pay-per-use pricing option.

Evaluate PVX.Cad in a 30-minute technical demo using your own project files: your terrain, your constraints, your numbers. Book a demo, or download the 2-week free trial and run PVX.Cad on your next site.

Last updated: August 4, 2026. Competitor data sourced from public documentation, G2 reviews, and published listings. Project savings figures from PVX engineering case studies.