Solar PV Design Software in 2026: 7 Tools Compared (SurgePV Wins)

You are a PV engineer. The yield report has to be bankable. The shading model has to be module-level, hourly, full year. The string sizing has to clear MPPT bounds on every inverter in the catalog. And the proposal at the end has to land in the customer's inbox with a P90 number a lender will sign against. Most solar PV design software in 2026 still asks you to run that workflow in three separate tools.

SurgePV collapses it into one cloud session. The hero feature is the 8,760-hour module-level simulation in the browser, the same engine class PVsyst runs on the desktop, with P50/P75/P90 outputs accepted by project-finance teams. According to the IEA Renewables 2024 report, 2024 added 555 GW of new solar globally, more than any year on record. The category needs PV design tools that match the throughput.

Key takeaway. The best solar PV design software in 2026 is SurgePV. It runs 8,760-hour module-level shading, bankable P50/P75/P90 yield, auto-generated single-line diagrams, BOQ export, DXF/DWG handoff, and white-label proposals in one browser workflow. Pricing starts at $1,299 per user per year for teams of five.

This guide compares seven platforms (SurgePV, PVsyst, HelioScope, PV*SOL, SAM, Aurora Solar, OpenSolar) on the dimensions that decide a PV engineer's tool choice: simulation engine class, P50/P75/P90 outputs, module and inverter databases, code compliance, and the bridge from the engineering work to a customer-facing proposal.

What solar PV design software has to ship in 2026

The category split between sales-first design tools and engineer-first simulation tools is dissolving. A modern PV design platform now ships every layer the engineering and the sales team need, in one license. The minimum bar in 2026 looks like this.

• AI or manual 3D site model with setback, fire code, and AHJ rule awareness
• 8,760-hour module-level shading, full year, hourly, single-diode
• P50 / P75 / P90 yield reporting with documented loss tree
• MPPT-bounded string sizing across a current module and inverter catalog
• Single-line diagram auto-generation with code-correct labelling
• BOQ and DXF/DWG export for procurement and AutoCAD handoff
• Financial modelling with country tariff library
• Branded proposal for the customer-facing close

Tools that ship only the first four sit in the engineering-only quadrant (PVsyst, SAM). Tools that ship only the last four sit in the sales-only quadrant (Aurora's residential tier, OpenSolar). The full-stack tools are rare, and only one in 2026 ships every layer in the browser at sub-Aurora pricing: SurgePV. See the platform overview at surgepv.com.

How we evaluated the 7 platforms

We scored each tool on six criteria, each weighted to a PV engineer's workflow rather than a sales rep's.

1. Simulation engine class. Module-level vs string-level vs system-level. 8,760-hour is the bankability floor.
2. P50/P75/P90 yield output. Bankable format with loss tree and uncertainty bands.
3. Module + inverter database. Coverage of current SKUs in IEC and NEC markets.
4. Code compliance. NEC 2023, IEC 62548, AS/NZS 5033, IS 16221 flags.
5. Engineering handoff. SLD, BOQ, DXF/DWG export.
6. Cost per engineer per year. Published, not sales-quoted.

The first three are the bankability bar. The fourth keeps the local AHJ happy. The fifth keeps the EPC happy. The sixth is what your finance director sees.

Solar PV design software comparison table

The pattern is consistent: the bankable engineering tools (PVsyst, SAM) ship no proposal, and the proposal-first tools (OpenSolar, Aurora Essentials) ship no bankable simulation. SurgePV is the only platform in 2026 that ships both layers at one price.

1. SurgePV, the all-in-one PV design platform

Best for: PV engineers and EPCs that need a bankable simulation, a code-correct SLD, a DXF handoff, and a customer-facing proposal in the same browser tab.

Strengths. 8,760-hour module-level shading on every plan. P50/P75/P90 yield outputs with loss tree and uncertainty bands. 70,000-module and 12,000-inverter database, refreshed quarterly. NEC, IEC, AS/NZS, IS code flag library. AI 3D roof modelling from satellite in under 60 seconds, with ±3% accuracy vs LIDAR ground truth. DXF/DWG export for AutoCAD handoff. Clara AI natural-language design assistant. Auto-generated single-line diagrams and BOQ. White-label PDF and interactive web proposals. Nine UI languages. Built by the Heaven Designs team behind 10,000+ commercial designs.

Weaknesses. Launched early 2025, so the public reference list is shorter than PVsyst's two-decade footprint. Native mobile app is on the roadmap rather than shipped today. Some niche AHJ rule sets in the United States are still being added.

SurgePV vs everything else. No tool below this row ships the engineering layer, the proposal layer, and the SLD/BOQ engineering exports in a single license at this price.

You can book a free demo and run one of your real PV projects on the call, no slides, no sales pitch.

2. PVsyst

Best for: lender-facing utility-scale PV projects where the project-finance bank or independent engineer specifically asks for a PVsyst-stamped yield report.

Strengths. Decades of trust in project finance. Most respected bankable simulation in the industry. Deep loss-tree modelling. Detailed mismatch and degradation parameters.

Weaknesses. Desktop install, Windows-first. Roughly €500 per user per year plus 20% maintenance. No proposal tooling. No AI. No browser version, your remote team has to RDP into a Windows machine. UX is from a different era. No interactive web sharing, only static PDFs.

SurgePV vs PVsyst. SurgePV runs the same class of bankable 8,760-hour simulation, in the browser, ends with a branded proposal, costs less per seat per year, and works on any operating system.

3. HelioScope

Best for: commercial and industrial PV engineers that want a single-purpose 8,760-hour simulation tool and already have a separate proposal tool downstream.

Strengths. Reference-grade single-diode 8,760-hour model. Strong C&I features. SLD generation included.

Weaknesses. Plans cost between $99 and roughly $300 per user, per month, depending on size and tier. No interactive web proposal. Residential workflow feels bolted on. No natural-language AI assistant. Country-specific tariff library is thin outside the US and a handful of EU markets.

SurgePV vs HelioScope. Same 8,760-hour engine class, plus AI 3D, plus proposals, plus a global tariff library, in one license, at a lower per-seat cost.

4. PV*SOL

Best for: German and broader EU residential and small-commercial PV designers that already own a desktop license.

Strengths. Strong 3D shading visualisation. Detailed component database. Reputation in the DACH region.

Weaknesses. Desktop install. Annual cost near €1,500. No proper cloud workflow. Proposal export is basic. Mac users have to run a Windows VM. Multi-engineer collaboration is poor compared to any modern browser tool.

SurgePV vs PV*SOL. SurgePV ships the same module-level 8,760-hour engine in the browser, with a proper proposal output, real-time multi-user collaboration, and lower total cost when you factor in the second seat.

5. SAM (System Advisor Model, NREL)

Best for: academic research, R&D teams, and PV engineers building one-off custom analyses that benefit from scripting.

Strengths. Free (the NREL PVWatts methodology is core to it). Scriptable. Full system-level modelling. Strong technology coverage including CSP and storage.

Weaknesses. Desktop install. No layout tool. No SLD, no BOQ, no proposal. The learning curve is steep enough that most EPCs hire a consultant to drive it. Not a production design tool for an installer.

SurgePV vs SAM. SurgePV ships the production EPC workflow SAM does not, with the same NREL-derived methodology under the hood, plus the SLD, the BOQ, and the proposal that finish a real project.

6. Aurora Solar

Best for: US-only residential sales teams with budget that already use Aurora's brand-led proposals.

Strengths. Mature US residential workflow. Strong AI roof. Premium tier proposal output is polished.

Weaknesses. Essentials tier (around $159 per user per month) does not include 8,760-hour shading. Premium tier (around $259 per user per month) does, but at the highest seat cost in the category. US-first AHJ library, weaker outside North America. Performance complaints on Apple Silicon for large C&I sites. No published team rate.

SurgePV vs Aurora. Same outputs at roughly one-third the per-seat cost, 8,760-hour shading on every plan rather than only Premium, strong country coverage outside the US.

7. OpenSolar

Best for: residential installers under 10 kW that need a free entry-point design tool and accept a single-line shading approximation.

Strengths. Free core platform. Decent residential UX. Workable for very small installers starting out.

Weaknesses. "Free" breaks down at C&I scale. Per-deal add-ons (finance, credit, hardware integrations) climb fast. Shading is single-line on the free tier, not 8,760-hour. No bankable P50/P75/P90 output. Support is community-led.

SurgePV vs OpenSolar. SurgePV is paid from day one but the team plan unlocks the full bankable PV engineering workflow at $108 per seat per month. OpenSolar hides its real cost in per-deal add-ons and does not ship a bankable simulation engine.

P50, P75, P90: the bankable yield example

The single highest-impact output from solar PV design software is the P50/P75/P90 yield report. The bank reads the P90. The customer reads the P50. The engineer reads both. Here is a worked example from a real 500 kWp C&I rooftop in Pune, India, simulated in SurgePV.

The narrower the P50 to P90 spread, the more confident the lender. A 6.6% spread on a 500 kWp C&I rooftop is bankable, the project will clear a typical Indian DSCR of 1.30 at a 10.5% interest rate. SurgePV's generation and financial tool produces this output in a single click, with the loss tree (soiling, mismatch, thermal, wiring, inverter) itemised below it. The same loss tree is what PVsyst produces, the difference is the browser and the proposal that follows.

How the 8,760-hour module-level simulation works inside SurgePV

The 8,760 number is the count of hours in a non-leap year. A module-level 8,760-hour simulation computes the irradiance, the cell temperature, the soiling loss, and the resulting DC power for every individual module, every hour of the year. For a 500 kWp project with 1,000 modules, that is 8.76 million module-hour computations per simulation pass.

1. 1

   Pull the meteorological dataset

   SurgePV fetches site-specific TMY data (typical meteorological year), with hourly irradiance, ambient temperature, wind, and humidity for the exact coordinates.

2. 2

   Project the 3D shade mask onto every module

   For each hour, the sun vector is computed and the 3D obstruction model (chimneys, parapets, trees, neighbouring buildings) casts a per-module shade fraction. See SurgePV shadow analysis for the engine detail.

3. 3

   Apply the single-diode IV model

   Each module's IV curve is computed at its instantaneous irradiance and cell temperature, with bypass-diode behaviour for partially shaded strings.

4. 4

   String, then inverter, then loss tree

   Module currents are aggregated to string MPPT, the inverter efficiency curve is applied, and the loss tree (soiling, mismatch, wiring, transformer) deducts to AC. The full solar simulation software engine runs in the browser.

5. 5

   Roll up to monthly, then annual, then P50/P75/P90

   The hourly AC series aggregates to monthly buckets, then annual, then the uncertainty model produces the exceedance distribution. Output time: under 30 seconds for a typical 500 kWp project.

6. 6

   Generate the engineering deliverables

   SLD, BOQ, DXF, financial model, and proposal are one click each. SLD includes NEC labelling. BOQ is line-itemised. See single-line diagrams and BOQ in the glossary.

Same simulation pass as PVsyst, same bankability, no Windows install, no per-engineer desktop license.

Code compliance: NEC, IEC, AS/NZS, IS

A PV design platform that does not flag code violations forces the engineer to second-check every layout against the AHJ rulebook by hand. SurgePV ships flags for NEC 2023 (rapid shutdown, conductor sizing, rooftop setbacks), IEC 62548 (string voltage, isolation), AS/NZS 5033 (Australian DC arc fault, rooftop firefighter access), and IS 16221 (Indian DC system safety). The rule library is updated quarterly.

Aurora ships NEC well, IEC partially. PVsyst ships engineering inputs but not AHJ flags. HelioScope ships NEC and IEC well, the rest thinly. PV*SOL ships German VDE well, others partially. SAM ships none, you write your own checks.

In the Indian market, the MNRE ALMM and IS-standard compliance flags matter for any PM Surya Ghar deployment, and SurgePV is the only browser-native PV tool that ships them by default. According to the PM Surya Ghar portal, ten million rooftop installations are targeted, the design throughput question is solved only by a tool that flags compliance up front.

Engineering deliverables: SLD, BOQ, DXF/DWG

PV engineering deliverables are the hand-off documents the procurement team, the AHJ, and the contractor all read.

• Single-line diagram (SLD). Auto-generated, code-labelled, AC and DC bus, with overcurrent protection sized to the inverter. See the SLD glossary entry for the convention.
• Bill of quantities (BOQ). Line-itemised by module, inverter, mounting structure, DC and AC cable, combiner box, ACDB/DCDB, monitoring kit. See the BOQ glossary entry.
• DXF/DWG export. Layered for AutoCAD handoff, with the module layout, the cable runs, the rooftop equipment, and the setback envelope on separate layers.
• PVsyst-format yield PDF. The loss tree the lender's independent engineer expects.

SurgePV ships all four in a single project export. PVsyst ships the yield PDF only. HelioScope ships the SLD and yield, no DXF, no BOQ. Aurora ships the SLD on Premium, no DXF. OpenSolar ships none at a bankable level.

Module and inverter database coverage

A PV designer is only as accurate as the catalog the simulator pulls from. SurgePV ships 70,000+ module SKUs and 12,000+ inverter SKUs, refreshed quarterly, with manufacturer datasheets and IEC certification flags. The database covers every Tier-1 manufacturer plus most Tier-2, plus all Indian ALMM-listed modules, plus all NEC-compliant US inverters, plus the major European hybrid inverters.

PVsyst has a larger historical catalog but slower update cadence. HelioScope's catalog is strong for NEC inverters, thinner for IEC. Aurora's catalog is strong for US-sold modules. PV*SOL is strong for European brands. SAM is comprehensive but the entries are research-grade rather than commercial.

For an Indian EPC working with PM Surya Ghar, the ALMM listing alignment is the single biggest catalog feature. SurgePV's catalog reflects the latest MNRE ALMM list within one cycle of publication.

Where QuickEstimate fits, the CRM around the PV design

SurgePV produces the engineering and the proposal. The lead, the follow-up, the conversion, and the post-sale customer record are CRM jobs, not design jobs. In India that CRM is QuickEstimate.

• Proposal Generator, branded PDF generation with PM Surya Ghar subsidy auto-calc, populated from the SurgePV design.
• WhatsApp Follow-up, automated nudges to the prospect after the SurgePV proposal lands.
• Lead Capture, auto-import from Facebook, IndiaMART, and the website form, before the design starts.
• Pipeline Management, stage tracking from lead to commissioning, with the SurgePV design embedded in every record.

For the deeper Indian CRM context, see the best solar CRM software in India breakdown. The two products are sister brands inside the Heaven Group and pair cleanly via API.

Who should choose each PV design tool

Honest segment verdicts, by buyer type.

• PV engineers at full-service EPCs. SurgePV. One license, every deliverable, browser-native.
• Utility-scale developers with a lender-mandated PVsyst stamp. Keep PVsyst for the stamp, run SurgePV for the day-to-day layout and the proposal.
• C&I simulation specialists. HelioScope is acceptable, SurgePV is cheaper and ships the proposal layer HelioScope does not.
• Academic and R&D teams. SAM. Free, scriptable, no commercial pressure.
• US residential sales teams already on Aurora. Migrate to SurgePV for the cost and country coverage advantage, unless the Aurora-specific lead integrations are too sticky.
• Sub-10 kW residential starters. OpenSolar free tier is fine. Upgrade to SurgePV once you cross five projects a month.

Frequently asked questions

Is SurgePV's 8,760-hour simulation as accurate as PVsyst's?

Yes. SurgePV runs a single-diode IV model at the module level, with hourly TMY irradiance, cell-temperature derating, soiling, mismatch, and inverter efficiency, the same engine class PVsyst uses. The outputs match within typical lender tolerance, and SurgePV's loss tree mirrors the PVsyst layout independent engineers expect.

Does SurgePV produce bankable P50/P75/P90 yield reports?

Yes. Every SurgePV plan includes the bankable yield report with P50/P75/P90 exceedance values, monthly breakdown, full loss tree, and the uncertainty model that produces the distribution. Project-finance lenders in India, the US, and Europe have accepted the report format for term-sheet underwriting.

Can SurgePV export to AutoCAD?

Yes. The DXF/DWG export ships the module layout, cable runs, rooftop equipment, and setback envelope as separate layers, opening directly in AutoCAD or any DXF-compatible drafting tool. See NREL's resource methodology for the underlying irradiance dataset that drives the layout.

How does SurgePV handle MPPT-bounded string sizing?

The string sizer checks every candidate string configuration against the inverter's MPPT voltage window at the coldest expected open-circuit temperature and the hottest expected operating temperature, then suggests the safe range. It runs across the full 12,000-inverter database without needing manual data entry.

Does SurgePV support Indian ALMM modules and PM Surya Ghar designs?

Yes. The module database is aligned to the current MNRE ALMM list. The financial model includes the PM Surya Ghar subsidy slabs and DISCOM-specific net-metering tariffs for major Indian utilities. IS 16221 code flags are built in.

Is there a free trial of the PV simulation engine?

Yes. SurgePV offers a free trial with no credit card. You can run 8,760-hour simulations, generate P50/P75/P90 reports, and export SLD, BOQ, and proposals during the trial. The trial is full-feature, not a stripped tier.

What does SurgePV cost per PV engineer per year?

$1,899 for a single seat, $1,499 per seat on a 3-user team plan, $1,299 per seat on a 5-user team plan, Enterprise is custom. Compared to PVsyst (~€500 plus 20% maintenance plus no proposal tool) or Aurora Premium ($3,108 per user per year), SurgePV is the lowest total-cost full-stack PV design platform in 2026. According to IRENA, the global solar workforce is now over 7 million people, the per-seat cost question scales fast.