Australian solar installers work in a compliance environment that is distinct from both the US (NEC 690) and Europe (CE marking and IEC standards). Software built for the US or European market works partially for Australian projects but misses the critical Australian layer: STC zone calculations, AS/NZS 5033 single-line diagram conventions, DNSP export limit modelling, CEC-approved inverter selection, and Australian feed-in tariff structures (including WA’s unique DEBS time-differentiated rates).
This comparison covers the main platforms used by Australian CEC-accredited installers in 2026 and evaluates how each handles the Australia-specific workflow.
What Australian CEC Installers Need from Design Software
Before comparing tools, it is worth being specific about what “Australia-ready” means for a CEC-accredited installer:
STC calculation: The software should automatically calculate the correct STC count from the installation postcode (zone), system size, and current deeming period, and display the dollar value in the customer proposal.
AS/NZS 5033-compliant SLD: The single-line diagram format must reflect Australian conventions (AS/NZS 5033:2021 symbols, DC isolator placement, earthing notation, DNSP connection point). A US NEC 690 SLD typically needs significant modification for DNSP submission.
CEC-approved inverter selection: The inverter component library should link to or align with the CEC’s approved inverter list under AS 4777.2:2020. Using a non-listed inverter in the design creates a compliance risk.
DNSP export limit: The financial model should allow entry of the DNSP export limit, calculating curtailed generation separately from exported generation, so the savings calculation is accurate.
Australian FiT and DEBS: Feed-in tariff rates vary by state and retailer. WA’s DEBS peak/off-peak structure requires time-differentiated modelling. A single blended FiT rate produces inaccurate WA results.
Feature Comparison
| Feature | SurgePV | Aurora Solar | OpenSolar | Pylon | Helioscope |
|---|---|---|---|---|---|
| Australia irradiance data | Yes (PVGIS) | Partial | Yes (PVGIS) | Yes | Partial |
| STC zone calculation | Yes | Manual | Yes | Yes | No |
| AS/NZS 5033 SLD format | Yes | Manual | Partial | Yes | No |
| CEC-approved inverter library | Yes | No (manual check) | Partial | Yes | No |
| DNSP export limit input | Yes | Manual | Yes | Yes | No |
| DEBS time-differentiated rates | Yes | Manual | Manual | Yes | No |
| AUD proposals with STC line item | Yes | Yes | Yes | Yes | No |
| 3D shading analysis | Yes | Yes | Yes | Yes | Yes |
| String sizing | Yes | Yes | Yes | Yes | Yes |
| Battery modelling | Yes | Limited | Yes | Yes | No |
| Price (approx.) | Moderate | Higher | Freemium | Moderate | Higher |
SurgePV
SurgePV is a cloud-based solar design, simulation, and proposal platform built for solar design workflows including Australian requirements.
What works well for Australia:
- STC calculation by postcode zone and deeming period — shown as a line item in the customer proposal
- AS/NZS 5033:2021-compliant single-line diagram output suitable for DNSP connection applications
- CEC-approved inverter component library
- DNSP export limit input — separates self-consumed, exported, and curtailed generation in the financial model
- DEBS time-differentiated export rate support for WA proposals
- PVGIS-sourced irradiance data with good regional Australian coverage
- Battery storage modelling — financial comparison of solar-only vs solar+battery scenarios
- Shadow analysis for roof-specific shading assessment
Best for: Australian CEC-accredited installers across residential and commercial segments who want compliance-ready documentation without manual supplementation.
Aurora Solar
Aurora Solar is a US-built platform used by some Australian installers.
What works for Australia:
- Strong 3D roof modelling and shadow analysis capability
- Good satellite imagery for metropolitan Australian locations
- Reasonable Australia irradiance data coverage through international weather datasets
- AUD proposal output with configurable incentive fields
What requires manual work for Australia:
- No automatic STC zone/deeming calculation — must manually enter as a custom incentive
- SLD output follows US NEC 690 conventions — needs modification for DNSP submission in Australia
- No CEC-approved inverter list integration — manual compliance verification required
- DNSP export limits must be manually configured — financial model may not correctly handle curtailment
- No DEBS peak/off-peak rate structure
Best for: Installers who prioritise 3D design and shading accuracy and are comfortable supplementing with manual Australian compliance documentation.
OpenSolar
OpenSolar is a freemium platform with a large Australian user base.
What works for Australia:
- Free tier makes it accessible for smaller installers and new entrants
- PVGIS irradiance data with good Australia coverage
- STC calculation (check current implementation — OpenSolar has developed Australian market features)
- AUD proposals with STC and FiT inputs
- Growing DNSP export limit functionality
- Reasonable battery modelling
What requires attention for Australia:
- SLD format may need modification for specific DNSP requirements
- CEC-approved inverter verification requires manual cross-checking
- DEBS time-differentiated rate modelling may require manual configuration
Best for: Smaller Australian installers or new entrants who need a no-cost starting point and can supplement with manual documentation where needed.
Pylon (Solar Business Tools)
Pylon (formerly Solar Business Tools) is an Australian-built platform.
What works well for Australia:
- Built specifically for the Australian market — Australian standards and compliance workflows
- STC calculation integrated from design stage
- DNSP export limits handled in financial model
- Australian-specific SLD format conventions
- CEC guideline alignment in design workflow
- DEBS support for WA customers
What to consider:
- Smaller user base than Aurora or OpenSolar globally
- Feature set continues to evolve — verify current capabilities against your specific requirements
- Engineering simulation depth may be less than US platforms for complex large-scale systems
Best for: Australian residential and small commercial installers who want an Australian-built tool with the compliance workflow built in from the start.
Helioscope
Helioscope (now part of Aurora Solar) is primarily an engineering simulation tool.
What works for Australia:
- Strong yield simulation accuracy for large and complex systems
- Useful for engineering validation of large commercial projects
Not suited for Australian residential/commercial sales workflows:
- No STC calculation
- No Australian DNSP documentation
- No customer proposal output in AUD
- No DEBS or Australian FiT modelling
Best for: Engineering teams needing accurate yield assessment for large commercial/industrial projects — not for residential or SME commercial sales.
Choosing the Right Tool for Your Business
| Business Type | Recommended Approach |
|---|---|
| Residential-focused installer (< 100 systems/year) | OpenSolar (free) + Pylon, with manual supplementation where needed |
| Growing residential + commercial installer | SurgePV or Pylon — Australian compliance built in |
| Large commercial-industrial installer | SurgePV for proposals + Helioscope for large-scale yield validation |
| Multi-state operation | SurgePV — handles different state FiT rates and DNSP requirements in one platform |
| WA-focused installer | SurgePV or Pylon — DEBS modelling built in |
The most common workflow gap for Australian installers is the disconnect between the design tool and DNSP connection documentation. A design completed in Aurora, with a US-format SLD that needs manual redrawing for DNSP submission, adds 1–2 hours per project and introduces transcription errors. Using solar design software that generates DNSP-ready Australian SLDs from the design directly eliminates this gap.
Design, Simulate, and Propose Australian Solar Projects with CEC-Compliant Documentation
SurgePV handles STC zone calculations, AS/NZS 5033 single-line diagrams, CEC-approved inverter selection, and DNSP export limit modelling — giving Australian CEC-accredited installers a single workflow from site survey to signed proposal.
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Frequently Asked Questions
What does solar design software need for Australia specifically?
STC zone calculation, AS/NZS 5033-format SLDs, CEC-approved inverter library, DNSP export limit input, Australian FiT rates (including DEBS for WA), and AUD proposals with STC line items.
Can Aurora Solar be used for Australian projects?
Yes — with manual supplementation of STC calculation, DNSP SLD formatting, and export limit financial modelling. Functional for design and simulation; requires manual compliance documentation work.
Is there Australian-built solar design software?
Yes — Pylon (Solar Business Tools) is Australian-built. SurgePV and OpenSolar are also used widely in Australia with Australian-specific features.
Does SurgePV support Australian compliance?
Yes. STC calculations, AS/NZS 5033 SLDs, CEC inverter library, DNSP export limits, and DEBS time-differentiated rates are supported in the SurgePV workflow.
What irradiance data should I use?
PVGIS (Photovoltaic Geographical Information System) is widely used and has good Australian coverage. BOM TMY data is authoritative for Australian locations. Ensure the software uses one of these — not just NREL’s US-focused dataset.
