Solar design software has specialized so cleanly that asking which tool is “best” misses the point — the real question is which stage of which segment’s workflow you are buying for. This guide compares the six platforms professional teams actually run in 2026, on identical criteria, from a one-truck residential installer’s needs to a gigawatt IPP’s development desk.
Residential sales-to-design: Aurora Solar — remote design, proposals, and financing hooks in one flow.
Fast C&I engineering: HelioScope — credible simulation at drag-and-drop speed in the browser.
Utility terrain engineering: PVcase — tracker rows, grading, and cabling inside AutoCAD.
High-volume feasibility: RatedPower — automated full-plant designs at tender pace.
Independent cross-check: NREL SAM — free, transparent techno-economic modeling.
Scope: this comparison covers PV design and simulation software for professional use — residential, commercial-industrial (C&I), and utility scale. It excludes pure CRM/proposal point tools and generic CAD. All six platforms were assessed against the same criteria; the order below groups them by workflow stage, not by rank.
Criteria: segment fit, deployment model, pricing structure, simulation credibility with financing parties, storage/hybrid design capability, and the main tradeoff a buyer accepts. Facts come from vendor materials and published third-party comparisons; pricing was checked on the date noted under the table and is indicative — every enterprise deal in this category is negotiated.
At a Glance
| Platform | Pricing | Best For | Link |
|---|---|---|---|
| PVsyst | Public price list — CHF 700/yr per seat | Bankable P50/P90 yield certification | pvsyst.com → |
| Aurora Solar | Per-seat SaaS, tiered (quote-based; ~$135–220/user/mo reported) | Residential & C&I sales-to-design workflow | aurorasolar.com → |
| HelioScope | Public price list — Basic $159, Pro $259/user/mo | Fast browser-based C&I engineering | helioscope → |
| PVcase | Enterprise annual (reported $25k+) | Utility engineering on real terrain | pvcase.com → |
| RatedPower | Enterprise annual (reported $30k+) | Automated utility feasibility at volume | ratedpower.com → |
| NREL SAM | Free (US national laboratory) | Independent techno-economic modeling | sam.nrel.gov → |
Pricing checked September 6, 2026. Most platforms in this category sell quote-based enterprise plans; where we cite figures they come from vendor pages or published third-party comparisons and are order-of-magnitude indications, not offers. Billing basis (per user, per MW, per site) varies by vendor — confirm current terms directly before budgeting.
The Platforms in Detail
PVsyst
The bankability standard
Best for: any project whose yield number will face a lender, an independent engineer, or an adversarial review.
| Segment focus | Utility and large C&I; usable at any scale |
| Deployment | Windows desktop |
| Pricing model | Public price list — PVsyst 8 Professional CHF 700/yr per seat, volume discounts to −20% at 10+ seats; server-side PVsystCLI CHF 3,000/yr. Checked September 8, 2026 |
| Simulation credibility | The de facto financing convention — P50/P90 reports IEs and lenders expect |
| Storage & hybrid | Batch and storage features present; not the workflow’s center |
| Main tradeoff | No proposals, no cloud collaboration — it certifies electrons, nothing else |
- Loss-model depth — soiling, mismatch, bifacial gain, tracker backtracking, near/far shading — validated over two decades of field reconciliation.
- Its output is the currency of project finance: even teams that design elsewhere re-certify in PVsyst before financial close.
- Steep learning curve is a hiring feature: the analyst market is trained on it, so staffing PVsyst seats is easier than any challenger.
Aurora Solar
Residential & C&I revenue machine
Best for: installers and EPCs whose bottleneck is signed contracts, not simulation physics.
| Segment focus | Residential first, C&I strongly |
| Deployment | Cloud SaaS |
| Pricing model | Per-seat subscription, tiered; no public price list — third-party comparisons report roughly $135–220/user/mo. Checked September 8, 2026 |
| Simulation credibility | Credible for bill-savings sales cases; not a lender instrument |
| Storage & hybrid | Battery attach modeling built for the sales flow |
| Main tradeoff | Sales-workflow depth over engineering depth — utility teams look elsewhere |
- LIDAR-based remote roof and shading design cuts truck rolls — the line item that decides residential margins.
- Proposal, financing, and CRM integrations turn design output directly into contract velocity.
- Owns HelioScope (acquired 2021), so the sales platform and the engineer’s tool share a roadmap without sharing a workflow.
HelioScope
The C&I engineer’s browser tool
Best for: commercial-industrial designers who want component-level electrical design and simulation in minutes.
| Segment focus | C&I; small utility capable |
| Deployment | Browser |
| Pricing model | Public price list — Basic $159/user/mo ($1,620/yr), Pro $259/user/mo ($2,640/yr), Enterprise custom. Checked September 8, 2026 |
| Simulation credibility | Bankable-adjacent; widely accepted for C&I decisions |
| Storage & hybrid | Improving; not yet a hybrid design suite |
| Main tradeoff | Limited terrain optimization — pure utility work outgrows it |
- Drag-and-drop layouts with real string-level electrical design — rare speed without giving up engineering substance.
- Browser deployment makes it the easiest tool in this guide to trial, standardize, and scale across a distributed team.
- Under Aurora’s ownership it keeps its distinct identity — buy it for engineering, not for proposals.
PVcase
Utility terrain engineering
Best for: utility developers and engineers whose costs live in grading, piles, and cable schedules.
| Segment focus | Utility only |
| Deployment | AutoCAD plugin + cloud siting (Anderson Optimization) |
| Pricing model | Enterprise annual; reported from ~$25k |
| Simulation credibility | Engineering-grade design; yield typically certified in PVsyst |
| Storage & hybrid | Layout-level support; dispatch sizing lives elsewhere |
| Main tradeoff | CAD-native power at CAD-native learning and licensing cost |
- Terrain-aware tracker rows, pile tables, and grading analysis — design detail that flows straight into procurement quantities.
- Lives where utility engineers already work (AutoCAD), so adoption rides existing muscle memory.
- Anderson Optimization acquisition added GIS siting upstream — screen, then engineer, in one vendor relationship.
RatedPower
Feasibility at tender speed
Best for: IPPs and developers screening dozens of sites or feeding auction pipelines with full-plant designs.
| Segment focus | Utility only |
| Deployment | Cloud SaaS |
| Pricing model | Enterprise annual; reported from ~$30k |
| Simulation credibility | Strong feasibility-grade estimates; certification still runs through PVsyst |
| Storage & hybrid | Hybrid options growing; automation-first philosophy |
| Main tradeoff | Automation’s breadth over bespoke engineering depth |
- Boundary in, complete plant out: layout, electrical, BOQ, and energy estimate in minutes — hundreds of iterations per week.
- Built for portfolio arithmetic: standardized outputs make site-versus-site comparison a spreadsheet, not a project.
- An Enverus company since 2022 — roadmap increasingly ties design to market and interconnection intelligence.
NREL SAM
The free independent check
Best for: analysts, students, and any team that wants a transparent second opinion on LCOE and yield claims.
| Segment focus | All segments, analysis-first |
| Deployment | Free desktop (US national lab) |
| Pricing model | Free |
| Simulation credibility | Respected and transparent; not a commercial certification instrument |
| Storage & hybrid | Strong techno-economic storage modeling |
| Main tradeoff | Not a design tool — no layouts, no proposals, no deliverables |
- Open, documented models make every assumption inspectable — the fastest way to audit anyone’s LCOE, including your own.
- Financial modeling depth (PPA, merchant, incentive structures) exceeds most paid design suites.
- Zero cost makes it the rational default second tool in every stack in this guide.
How Professional Stacks Combine the Tools
Real workflows are sequences. A utility developer typically screens sites with automated or GIS tooling (RatedPower-class), engineers the maturing design in PVcase or CAD, certifies yield in PVsyst for the financing package, and cross-checks economics in SAM. A C&I EPC runs HelioScope for layout and simulation, layers proposals on top, and calls PVsyst only when a lender or offtaker demands it. Residential at scale is Aurora end-to-end, tuned to minimize change orders — the metric that actually decides installer profitability.
Integration seams are where design time dies: boundaries and terrain moving between GIS, CAD, and simulators; component libraries kept consistent; revisions synchronized with proposals. Ask every vendor three questions — what imports natively, what exports cleanly, and which of your existing systems they have integrated at reference customers. A tool’s marginal simulation accuracy matters less than whether your team re-enters data three times per design.
What Separates Segment Requirements
Residential software is sales software: remote accuracy, proposal speed, financing hooks, and design-to-install fidelity; simulation beyond credible bill savings is wasted. C&I needs real electrical engineering plus tariff-aware savings for sophisticated offtakers — where HelioScope-class tools earn their keep. Utility inverts the stack: terrain and civil detail dominate cost, and the yield number faces an independent engineer paid to find your optimism — hence the segment’s two-tool truth of iterate-anywhere, certify-in-PVsyst.
Storage co-design is the open frontier across all three segments: DC-coupled sizing, augmentation planning, and dispatch-aware battery selection still live in spreadsheets and specialist tools. Every vendor ships partial answers; none owns the workflow. Buyers with storage-heavy pipelines should score shipped hybrid features and live references, not roadmap slides — and expect the category’s next consolidation wave to be fought exactly there.
Kurums Match: Which One Fits You?
Pick the statement that sounds most like your situation.
“I run a residential install business and need more signed contracts.”
Aurora Solar is built for your funnel: remote LIDAR design, instant proposals, financing integrations. Add nothing else until a commercial lender first asks for a PVsyst report — then buy one seat, not a suite.
“We design C&I systems weekly and engineering time is the bottleneck.”
HelioScope: component-level electrical design at browser speed, easy to standardize across a team. Keep SAM open for free economics cross-checks, and budget a PVsyst seat for the projects that get financed.
“We develop utility-scale projects and bid competitive tenders.”
Pair RatedPower-class automation (iteration volume) with PVcase-class CAD engineering (terrain truth) and certify in PVsyst. Negotiate seats by workflow stage: many screening seats, few certification seats.
“I mostly analyze and audit other people’s numbers.”
Start — and possibly end — with NREL SAM: transparent models, deep financial structures, zero cost. Add PVsyst only if you issue yield opinions others will finance against.
Frequently Asked Questions
Is PVsyst really mandatory for utility projects?
Not by law — by convention: independent engineers and lenders overwhelmingly expect PVsyst-based P50/P90 yield reports, so even teams designing elsewhere certify in PVsyst. Displacing a financing-side convention takes years.
Are HelioScope and Aurora the same product now?
No — Aurora Solar acquired HelioScope’s maker in 2021 but maintains both: Aurora as the residential/C&I sales-and-design platform, HelioScope as the browser engineering tool. Roadmaps share technology; workflows remain distinct.
What does utility design software cost?
Published comparisons put PVcase and RatedPower in enterprise territory ($25k–$30k+ annually) and PVsyst multi-seat setups in the high four figures per year, while cloud C&I tools run per-user monthly. Enterprise pricing is negotiated — verify with vendors.
Is free software good enough to start?
Often, yes: SAM delivers credible techno-economic modeling, and free sales platforms cover early residential operations. Teams typically outgrow free tools at the point of lender scrutiny or engineering depth — exactly when paid stacks earn their cost.
Related Comparisons & Guides
- Solar proposal & sales software compared
- Renewable site selection & land software compared
- Renewable energy forecasting & weather data compared
- Wind resource assessment software compared
- Renewable asset management platforms compared
- Battery storage optimization platforms compared
- How US renewable projects are financed
Last updated: September 6, 2026 · Reviewed by the Kurums Startup editorial team.
Disclosure: Kurums currently has no affiliate, sponsorship, or partnership relationship with any product compared on this page. If that changes, this page will say so here and affected links will carry sponsored attributes.
Part of the Kurums Renewable Energy hub — country strategies, permitting, incentives, financing, and tools across nine markets.
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