What CEC accreditation do I need to install commercial solar systems?

To design and install grid-connected solar systems of any size in Australia, you need CEC Solar Accreditation (Grid-connect PV systems). This covers residential and commercial installations. For systems above 100kW, you also need to hold a CEC Designer accreditation (or work with one) for the system design. Some states have additional requirements for large systems — check your state regulator's requirements. Without CEC accreditation, you cannot legally install grid-connected solar systems and are not eligible for Small-scale Technology Certificates (STCs) or Large-scale Generation Certificates (LGCs).

What is the process for getting network approval for a commercial solar system?

For systems above 10kW (the typical threshold for requiring network approval, though this varies by network), you must submit a connection application to the relevant distribution network service provider (DNSP) before installation. The process involves: submitting technical documentation including system design, inverter specifications, and proposed protection settings; the DNSP reviewing the application (timeframes vary from 2 weeks to several months for larger systems); receiving conditional or unconditional approval; installing per the approved design; and notifying the DNSP on completion. Some networks require a witness test by a network representative before the system can be energised.

What size is considered a commercial solar system?

There's no single industry definition, but in practice: systems up to 30kW are small commercial (typically single-phase or three-phase, standard inverter, straightforward approval process); 30–100kW is medium commercial (three-phase, more complex metering and protection, DNSP approval always required); 100kW–1MW is large commercial (string or central inverters, potentially multi-transformer, LGC eligibility, more complex network approval); above 1MW is utility-scale requiring substantial specialist expertise. Most small-to-medium electrical businesses work in the 10–250kW range.

What metering is required for commercial solar systems?

Commercial solar systems require revenue-grade metering capable of separately measuring: energy exported to the grid, energy imported from the grid, and energy generated by the solar system. For systems above the small-scale threshold (100kW for LGC purposes), interval metering (typically 5-minute intervals) is required for LGC creation. The metering must comply with the National Metering Identifier (NMI) requirements and be installed by a metering coordinator. In practice, this means coordinating with the customer's electricity retailer and the metering coordinator — the DNSP does not install metering.

How do I price a commercial solar job profitably?

Commercial solar pricing has three components: equipment (panels, inverters, racking, metering, switchgear), labour (design, installation, commissioning, documentation), and compliance costs (network application fees, metering coordinator fees, CEC documentation). Equipment is usually the largest cost and varies with market pricing. Labour rates for commercial solar should be higher than residential — the complexity, compliance requirements, and liability are greater. Common mistakes are underpricing the design and compliance work (which is significant for large systems) and not building in contingency for network approval delays or design changes required by the DNSP.

Where can I get the full Sparky's Playbook?

This article is an excerpt from The Sparky's Playbook — a free 12-chapter PDF guide for Australian electricians covering compliance, cash flow, scaling, and exit strategy. Download the complete guide at [tradieautomate.com/playbook](https://tradieautomate.com/playbook).

What CEC accreditation do I need to install commercial solar systems?

CEC Solar Accreditation (Grid-connect PV systems) is required for all grid-connected solar installations. For systems above 100kW, a CEC Designer accreditation is also required for the system design. Without CEC accreditation, you cannot legally install grid-connected solar or access STCs.

What is the process for getting network approval for a commercial solar system?

For systems above 10kW, submit a connection application to the DNSP with technical documentation. The DNSP reviews the application (2 weeks to several months depending on system size), issues conditional or unconditional approval, you install per the approved design, and notify the DNSP on completion. Some networks require a witness test before energisation.

What size is considered a commercial solar system?

In practice: up to 30kW is small commercial; 30-100kW is medium commercial; 100kW-1MW is large commercial; above 1MW is utility-scale. Most small-to-medium electrical businesses work in the 10-250kW range.

What metering is required for commercial solar systems?

Commercial solar requires revenue-grade metering measuring energy exported, imported, and generated. For systems above 100kW, interval metering (5-minute intervals) is required for LGC creation. Metering is installed by a metering coordinator, not the electrical contractor — coordinate early as it's often on the critical path.

How do I price a commercial solar job profitably?

Commercial solar pricing covers equipment, labour, and compliance costs (network application fees, metering coordinator fees, CEC documentation). Labour rates should be higher than residential given the complexity and liability. Common mistakes are underpricing design and compliance work and not building in contingency for network approval delays.

Jul 20, 2026

Last updated on Jul 20, 2026

The Sparky's Playbook — Chapter 5: Commercial Solar Systems

This article is Chapter 5 of The Sparky’s Playbook — the free guide to scaling, compliance, and building a high-value electrical business in Australia. Download the full 12-chapter book free →

Sparky’s Playbook — Chapter 5: Commercial Solar Systems

Commercial solar is one of the most significant growth categories in the Australian electrical industry. Falling system costs, rising electricity prices, and genuine business demand for on-site generation have created a market where commercial solar is no longer an early-adopter decision — it’s a mainstream capital investment.

For electrical businesses with CEC accreditation and the capability to navigate network approvals, commercial solar represents larger job values, higher margins, and a technical differentiation that reduces price competition.

This chapter covers the requirements, process, and business approach for commercial solar work — from the 20kW factory rooftop to the 250kW distribution centre installation.

The Commercial Solar Market in Australia

Commercial solar in Australia is driven by three factors:

Economics. A commercial solar system generating power at 5–8 cents per kWh (levelised cost) against grid prices of 25–45 cents creates a compelling return on investment. For businesses with significant daytime electricity consumption, payback periods of 3–6 years are common.

Policy. Small-scale Technology Certificates (STCs) provide an upfront incentive for systems up to 100kW. Large-scale Generation Certificates (LGCs) apply to systems above 100kW and generate ongoing revenue. State government programs add additional incentives in some jurisdictions.

Sustainability commitments. Listed companies, large corporates, and government entities are operating under sustainability targets that make on-site solar generation a genuine business priority, not just an economic decision.

The combination creates sustained, high-value demand — and it’s demand for installers who can do the technical work properly, not the lowest-cost operator.

CEC Accreditation — What You Need

CEC Solar Accreditation is mandatory for installing grid-connected solar systems in Australia. Without it, you cannot:

Legally install grid-connected solar
Access STCs (which are how most customers offset system cost)
Be listed on the CEC Find an Installer database (which many customers use to find installers)
Have manufacturer warranties honoured on many inverter brands

The accreditation pathway:

Complete an approved training course (TAFE or private RTO, typically Certificate IV in Solar Energy)
Pass the CEC accreditation assessment
Maintain CPD hours annually to retain accreditation
Renew annually

For commercial systems above 100kW, the system must be designed by a CEC-accredited designer. If you’re not accredited as a designer, you need to work with one — either employing a designer or contracting the design work out.

The business case for the designer accreditation:

The CEC Designer accreditation for large commercial systems is achievable and removes a dependency on external designers. If you’re targeting commercial solar above 100kW seriously, the designer pathway is worth pursuing.

System Design — Getting It Right

Commercial solar design is more complex than residential. The key variables:

Load profile analysis. A commercial system is sized to match the customer’s consumption pattern, not just their roof space. A business that runs Monday to Friday during daylight hours has a very different optimal system size than a 24/7 cold storage facility. Incorrect sizing — either under or over — reduces the return on investment.

Roof structure assessment. Commercial roofs — trapezoidal, corrugated iron, TPO membrane, flat — have specific racking requirements. Structural loading calculations may be required for large installations. Some roofs require structural engineer sign-off before installation.

String design and inverter selection. String configuration affects yield. Inverters must be appropriately sized for the array, compatible with the network approval requirements, and suitable for the operating environment (temperature, dust, humidity).

Protection requirements. DNSP network approvals specify protection requirements — anti-islanding, voltage and frequency limits, reactive power capability. The inverter must be capable of meeting these requirements and configured correctly during commissioning.

Shading analysis. Commercial roofs often have air conditioning units, exhaust fans, skylights, and other obstructions. A shading analysis (using software such as PVsyst or Aurora Solar) is part of a professional design.

Network Approval Process

For any system above 10kW (exact thresholds vary by DNSP), network approval is required before installation. This process is often the longest lead time item in a commercial solar project.

The process step by step:

Pre-application assessment — For larger systems (typically 30kW+), contact the DNSP before formal application to understand whether the local network has capacity for the proposed system. Some feeders are constrained; knowing this early avoids design rework.
Connection application — Submit the formal connection application with technical documentation: system design, inverter specifications, single-line diagram, protection settings.
DNSP review — The DNSP assesses the application against network standards. Timeframes range from 2–4 weeks for small commercial to 3–6 months for large systems requiring detailed power flow studies.
Approval conditions — Most approvals come with conditions: specific protection settings, export limits, metering requirements. The installed system must comply with these conditions.
Install and notify — Install per the approved design. Notify the DNSP on completion.
Witness test (where required) — Some DNSPs require a witness test before the system is energised. Schedule this in advance — it adds lead time.

Managing customer expectations around approval timelines:

Network approval delays are the most common source of commercial solar project timeline blowouts. Build realistic timeframes into your quotes, start the application as early as possible (often before contracts are signed for large systems), and communicate proactively with customers when delays occur.

Metering for Commercial Solar

Commercial solar requires revenue-grade metering that the residential install flow doesn’t include. This is an area where many electricians get caught — the metering arrangements for commercial solar are more complex than the hardware installation.

What’s required:

Import/export meter — Measures energy imported from and exported to the grid. Required for billing purposes and for any feed-in tariff.
Generation meter — Measures energy generated by the solar system. Required for STC and LGC creation.
Interval metering — For systems above 100kW (LGC eligibility), 5-minute interval data is required. Most commercial properties above this threshold already have interval meters, but check.

Who installs it:

Metering is installed and programmed by a metering coordinator, not the electrical contractor. Your role is to provide the correct metering enclosure and wiring infrastructure per the metering coordinator’s requirements.

The metering coordinator is engaged by the customer through their retailer. Coordinate early — metering installation is often on the critical path.

Commissioning and Handover

Commercial solar commissioning is a formal process, not just “turn it on and check it works.”

Commissioning checklist:

Check	Standard
Insulation resistance testing (all strings)	AS/NZS 5033
Polarity verification (each string)	Before energising
Open circuit voltage measurement	Verify against design
String current measurement	Verify against design
Protection setting verification	Per DNSP approval conditions
Anti-islanding test	Per inverter manufacturer and DNSP requirements
Monitoring system configuration	Verify data is logging correctly
Generation meter registration	Via metering coordinator

Documentation on handover:

Certificate of Compliance (electrical)
CEC installation certificate
System design documentation
Network approval documentation
Protection settings verification report
Warranty documentation for all major components
Monitoring system access credentials and instructions

Complete documentation is not optional — it’s part of the product you’re selling. A customer who paid $150,000 for a commercial solar system expects to receive comprehensive documentation.

Winning Commercial Solar Work

The commercial solar market is competitive. Winning work on technical capability rather than price alone requires:

Proposal quality. A commercial solar proposal should include: a load analysis showing how the system matches the customer’s consumption, a production estimate (annual kWh), a financial analysis (NPV, IRR, payback period), a system specification, a timeline including network approval, and warranty and maintenance terms. Generic quotes lose to specific, well-researched proposals.

Case studies. Commercial buyers want to see evidence that you’ve done this before. A portfolio of 3–5 commercial installations with customer references and performance data is worth more than any marketing spend.

Referral networks. Commercial solar is heavily referral-driven. Accountants, property managers, commercial real estate agents, and equipment financiers all work with clients who are potential commercial solar buyers. Building relationships in these networks generates warm leads.

Quick Wins

3 actions to position for commercial solar work:

Get your CEC Designer accreditation if you’re doing systems above 100kW — removing the dependency on external designers increases your margin and control.

Build a commercial solar proposal template — a professional proposal document that includes load analysis, financial modelling, and clear technical specifications immediately differentiates you from quote-only competitors.

Contact your local DNSP’s connections team — understand the approval process and typical timelines for your area before quoting. This avoids timeline commitments you can’t meet.

Want the full Sparky’s Playbook? This is Chapter 5 of a free 12-chapter guide covering licensing, EV charging, commercial solar, cash flow, tech stack, marketing, and building a business worth selling. Download The Sparky’s Playbook free →