Answer
The best solar design software for US installers depends on what you must deliver: layouts, energy estimates, electrical drawings, permit documents or proposals. Aurora, HelioScope, PVWatts, PVsyst, PVcase and SurgePV cover different jobs. Compare each vendor's published scope, then run real projects through it. Software output is not a permit or utility approval.
US installer teams need different tools for roof layouts, energy estimates, electrical documents and customer proposals. Pick around the work you have to deliver and the review process in your area. A document from design software is not a permit, a utility approval or an engineer’s sign-off.
Last updated: November 2026.
SurgePV publishes this post and sells solar design software. This is a desk comparison of each vendor’s own documentation, last checked on 30 September 2026. It is not a ranking. We have not measured any vendor’s accuracy, permit rejection rate or training time.
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Software shortlist by project job
Each tool below does a different job, and none has to do all of them. Check the exact version, plan and module you would buy.
| Tool and source | What the vendor documents | Ask for before you choose |
|---|---|---|
| SurgePV design workflow | Solar design, with separate proposal software | A demo and written scope for the model, drawings and handoffs you need. Automated local approval and built-in incentive verification are not claimed |
| Aurora design documentation | Site model, PV design, simulation and configurable jurisdiction setbacks | Your imagery, setback defaults, reports and proposal workflow on your plan |
| HelioScope design solutions | Commercial rooftop, carport and ground-mount design, shading, electrical configuration and simulation | A real commercial design, its losses and output report |
| PVWatts | Early grid-connected PV energy estimates from the inputs you enter | A saved record of the inputs. It gives an estimate, not an installation drawing or permit package |
| PVsyst documentation | PV sizing and simulation with weather, equipment, shading and loss analysis | The versioned model, assumptions and report. Using PVsyst does not mean a lender will accept the result |
| PVcase product portfolio | Separate site selection, AutoCAD-based ground-mount and roof-mount design, and yield products | The exact product you would buy, CAD dependencies and how files move between applications |
These are vendor descriptions. They do not show that a tool is cheapest, most accurate or right for your project volume. PVcase also sells a separate Roof Mount product, so compare the named product, not the whole company.
What do these tools cost?
As each vendor publishes it on its own pricing page (viewed 28 October 2026), a one-user entry plan runs as follows. PVsyst’s price is CHF 700 a year, about 854 USD per the PVsyst shop. PVcase does not publish prices. PVWatts is a free public calculator.
- Aurora Solar Basic$1,908 $159 a month, billed monthly
- SurgePV (1 seat)$1,899
- HelioScope Basic$1,620
- PVsyst 8 Professional$854 CHF 700
- PVWatts$0 free
Source: Aurora, HelioScope, PVsyst and SurgePV pricing pages, checked 28 October 2026.
Key Takeaway
Entry prices sit in a narrow band, roughly $1,600 to $1,900 per user per year for the paid design tools. Price rarely decides it. What each tool produces for your project type does.
Aurora’s page lists plans per user per month, HelioScope per license, and SurgePV per user per year (1,899 for one seat, 1,499 each for three, 1,299 each for five, per the SurgePV pricing page). Get a written quote that names seats, projects, modules, storage, APIs, support and renewal.
Build your US requirements list
Keep three review tracks separate. Their documents overlap, but the approvals do not.
| Track | Settle before comparing tools | Question for the software |
|---|---|---|
| Electrical | Adopted NEC edition, local amendments, equipment, who reviews | Does the output show the design basis so a qualified person can check it? |
| Building, structural and fire | Local requirements, roof conditions, pathways | Can geometry and notes be checked against those requirements? |
| Utility interconnection | The utility’s own procedure and equipment documents | Can you prepare the application records without treating them as permission to operate? |
NFPA publishes the NEC, including a 2026 edition. Publishing is not adoption. Record the edition and effective date your jurisdiction uses instead of assuming “2023 everywhere” or “2026 everywhere.”
Rapid shutdown and roof access are different requirements. The 2021 IRC solar provisions include roof access and pathways. That is one model-code example, not a rule for every roof. Do not label every fire pathway as NEC 690.12.
For the electrical check, have a qualified reviewer verify temperature-dependent voltage, operating windows, input current limits and circuit design against the equipment instructions. A green automated check does not replace that review. The US NEC guide and the string design error guide help you structure the questions.
Match the tool to project type
Residential roof and sales work. Test complex roof planes, obstructions and how old the imagery is. Then follow the design into the proposal and see who owns each version. A convincing 3D roof does not prove structural capacity or real dimensions.
Commercial rooftop and carport work. Check usable area, equipment layout, shading, electrical configuration and exportable reports. Where financial modeling matters, use the real load and tariff.
Ground-mount and engineering work. Test terrain handling, layout limits, CAD dependencies and the files that go to your engineer or finance reviewer. No software brand guarantees that a lender will accept the model.
Early screening. PVWatts can give a first energy estimate. Save the inputs, then get the layout, electrical, structural and local documents the next stage needs.
Check production estimates and proposal economics
For an energy model, keep the weather source and period, system size basis, geometry, shading, equipment, loss assumptions, model version and the AC output point. Compare tools on identical inputs. An hourly series alone does not prove a forecast is accurate.
Ask for a report that explains why two scenarios differ, with shading, clipping and other losses split out the same way each time.
For proposals, check ownership, install timing, utility settlement, financing and tax assumptions one by one. The IRS residential clean energy credit page says the 30% credit covers qualified property installed from 2022 through December 31, 2025 and is not available for property placed in service after that date. A new 2026 homeowner proposal should not carry an automatic 30% line from an old template. Commercial and third-party-owned systems need a separate current check.
Use the solar incentive finder to locate the administrator, then check status and conditions on the administrator’s own page.
Pro Tip
Put the tax and incentive assumptions in a labelled block on every proposal, with the date you checked them. When a rule changes, you update one block instead of hunting through old quotes.
Test with a small set of real projects
Run about five projects through the plan you would buy. Five is a practical starting set, not a rule. Use approved or synthetic data and the same acceptance list for each vendor.
Include a simple roof, a complex roof, a shaded site, a commercial job if you do them, and a revision of an existing design.
| Test | Keep as evidence | Pass when |
|---|---|---|
| Geometry and layout | Input source, dimensions, obstructions | A reviewer can see which site assumptions are still open |
| Electrical configuration | Exact module and inverter models, design conditions | A qualified reviewer can reproduce the required checks |
| Permit documents | Your local checklist and the generated documents | Missing items and manual work are listed |
| Proposal | Design revision, tariff, financing and tax basis | Customer numbers trace back to labelled assumptions |
| Revision | Changed layout or equipment and the new drawings | Dependent outputs update or are flagged |
| Handoff and exit | Exported models and reports | Another team can use them without hidden dependencies |
Ready to run your own test projects?
Ask for a SurgePV demo on one of your past roofs and compare the outputs with what you built.
Book a DemoWant licence costs first? See the SurgePV pricing page
Time each task and note corrections, review time and steps the tool leaves out. Do not copy a vendor’s hours-saved figure into your business case.
Permit platforms and contract questions
Ask your authority having jurisdiction (AHJ, the local permit office) which submission route is open and which projects qualify. If SolarAPP+ or another streamlined route comes up, check its eligibility and participating jurisdictions directly. This post found no published proof of a specific design vendor’s integration, nationwide instant approval or a current jurisdiction count.
Do not set purchase thresholds such as “500 projects per month” from a vendor’s marketing. Test the exact scope you will pay for.
To see the outputs, review steps and handoffs on a project of yours, book a SurgePV demo. For wider software discovery, use the US software category and the global design software guide.
Frequently Asked Questions
What is the best solar design software for US installers?
There is no single best tool. The right one depends on the deliverables you need and your local review process. Aurora Solar, HelioScope, PVWatts, PVsyst, PVcase and SurgePV cover different jobs, so compare what each vendor publishes against your own project list. This guide does not rank them or score accuracy.
Does solar design software give NEC or permit approval?
No. A generated drawing or a green check is not a permit, engineering approval or utility permission to operate. Record the adopted electrical code and local amendments, the building and fire requirements, the utility procedure and who reviews each one.
Are roof fire pathways the same as NEC rapid shutdown?
No. Rapid shutdown and roof access are separate requirements. Model building and fire codes cover roof access and pathways, while the electrical code covers PV circuits and shutdown. Apply the editions and amendments your jurisdiction has adopted, not a single national setback.
Should a 2026 US homeowner proposal assume a 30% federal credit?
No. The IRS says the residential clean energy credit is not available for property placed in service after December 31, 2025. Prior eligible credits and carryforwards are separate questions, and commercial or third-party-owned systems need their own eligibility review.
How should I compare production estimates from different tools?
Compare them on the same inputs. Keep the weather source, system size basis, roof geometry, shading, equipment, loss assumptions and model version for each run. Only then can you tell whether a gap comes from the software or from the inputs.
How do I evaluate solar design software before buying?
Run a small set of real projects through the exact plan you would buy and keep the inputs, outputs and corrections. Check layout, electrical design, permit documents, proposals, revisions and exports. Time the actual tasks instead of relying on a vendor’s savings claim.
Where this fits
This article is part of SurgePV's Solar Design hub, which works through the topic from first principles to the decisions a project team actually has to make.
