May 19, 2026

Adding Battery Storage to Your Solar Business: The Complete Guide for Australian Installers

Battery storage attachment rates with new solar installations in Australia have climbed dramatically in the past two years. In some states and markets, more than half of residential solar installations now include a battery. The standalone solar-only installation is increasingly a reduced-margin commodity sale; the solar + battery package is where margin, differentiation, and customer lifetime value live.

For solar installation businesses that haven’t yet added battery storage to their offering, 2026 is the year to do it. The market is there. The customer demand is there. And the compliance pathway — while more involved than adding a panel string — is well-defined for businesses willing to invest in getting it right.

This guide covers everything: the CEC battery endorsement, AS/NZS 5139 compliance requirements, how to price battery jobs, the products that are selling, and how to build battery storage into your business model.

Why Battery Storage Matters for Your Business

Higher job values. A 6.6kW solar installation might sell for $7,000–$9,000. Add a 10kWh battery system and the same customer represents $15,000–$22,000+ in revenue. The incremental labour is significant but the margin on the battery is often strong.

Better customer lifetime value. A battery customer has more invested in their energy system. They call you for monitoring issues, warranty questions, and eventually additional battery expansion. They’re less likely to use a different contractor for their next job.

Competitive differentiation. Many solar businesses in the market can install solar. The subset that also do battery adds a meaningful differentiator — and allows you to offer a complete solution rather than referring the battery portion to a competitor.

The grid independence narrative. Battery storage lets you tell a compelling story: “You’ll generate from solar, store what you don’t use, and use that at night — your grid bill goes from hundreds to almost nothing.” This is a powerful sale that customers initiate themselves when they understand how it works.

Step 1: Get Your CEC Battery Storage Endorsement

The first requirement for installing battery storage systems eligible under the SRES is the Clean Energy Council Battery Storage Endorsement. This is separate from your existing Grid-connect PV accreditation.

Who needs the endorsement

If you want to create STCs for systems that include battery storage, or if you want to install battery systems and market yourself as CEC-accredited for battery installations, you need the endorsement. Installers without the endorsement can still install batteries, but the installation won’t be CEC-endorsed and won’t be eligible for any STC or state rebate schemes that require CEC battery accreditation.

How to get the battery endorsement

The CEC battery storage endorsement requires:

Completion of an approved training course — a recognised RTO delivers the battery storage accreditation training. The course is typically 1–2 days (classroom or online + practical assessment).
Hold a current Grid-connect PV accreditation — the battery endorsement is an add-on to your solar accreditation, not a standalone qualification.
Application to the CEC — submit your training certificate and application through the CEC’s online portal.

Cost: Training courses typically range from $500–$1,200. CEC application fees apply.

Don’t skip this. Installing batteries without the endorsement and claiming STC eligibility is an accreditation violation — one of the most common enforcement actions the CER takes in 2026. Get the endorsement first.

Step 2: Know Your AS/NZS 5139 Requirements

Every battery installation in Australia must comply with AS/NZS 5139:2019 — Battery Energy Storage Systems. This is the standard that governs installation requirements, clearances, safety systems, and commissioning for residential and commercial battery systems.

Our complete AS/NZS 5139 guide covers every requirement in detail. The key compliance areas for residential installations:

Location and clearances

Battery systems cannot be installed in certain locations regardless of technology type:

Bedrooms or bathrooms
Areas above sleeping areas
Areas directly adjacent to exits or emergency egress paths
Areas without adequate ventilation

Minimum clearances apply from:

Windows and doors (for ventilation and heat dissipation)
Air conditioning units and outdoor units
Other combustible materials

Document clearance compliance with photos at every installation. If a warranty or insurance dispute occurs later, your installation photos are your evidence that the system was installed correctly.

Ventilation requirements

Lithium-ion batteries — the dominant technology in the Australian market — still require attention to ventilation under AS/NZS 5139. Indoor installations in enclosed spaces or near heat sources require ventilation assessment. Outdoor weatherproof enclosures have different requirements.

Signage and labelling

Specific signage is required at the battery system — including emergency isolation labels, battery technology identification, and installer identification. Missing signage is one of the most common AS/NZS 5139 failures found in audits.

Commissioning

The system must be commissioned per the manufacturer’s requirements and the AS/NZS 5139 standard. Commissioning records — including voltage readings, cell balancing status (where applicable), system configuration, and firmware version — must be documented.

Step 3: Understanding the Battery Products That Sell in 2026

The battery market is not homogeneous. Different products suit different customers and installation scenarios.

Tesla Powerwall 3

The market-leading brand by recognition. The Powerwall 3 is a single integrated unit (13.5kWh usable) with its own integrated solar inverter — changing the installation model for solar + battery packages.

Installer considerations: Powerwall 3 installs require Tesla-specific training and installer registration. The design tool is different from conventional solar design. Tesla controls the customer relationship more tightly than other brands. Margin is strong but pricing is fixed.

BYD Battery-Box Premium

Strong brand recognition from BYD’s EV profile. Modular design allows scalable capacity from 5.1kWh to 61.4kWh. Competitively priced. Works with most hybrid inverters.

Installer considerations: Works with all major hybrid inverter brands (Fronius, SolarEdge, SMA, Goodwe, Sungrow). Flexible installation. Attractive price point for the value-conscious customer.

Sungrow SBR Series

Strong value proposition. Modular design. Australian market presence growing rapidly. Good compatibility with Sungrow inverters (vertically integrated solution) and some other brands.

Fronius Symo GEN24 + BYD / Victron

Premium positioning. Fronius inverters have a strong reputation in the Australian market. The GEN24 is a premium hybrid option. Higher price point but strong installer margins and premium positioning.

Sonnen

German brand with a premium positioning and all-in-one approach. Higher price point. Strong in certain customer segments (sustainability-focused, premium market).

General advice: Develop expertise in 2–3 battery systems rather than trying to sell everything. Deep product knowledge lets you design better systems, install more efficiently, and handle warranty/commissioning issues with confidence.

Step 4: Pricing Battery Installations

Battery installation pricing has several components:

Battery unit: Varies widely by brand and capacity. As a reference:

10kWh LFP (BYD, Sungrow equivalent): $5,500–$8,000 trade
13.5kWh Powerwall 3 (integrated inverter): $9,500–$12,000 trade
5.1kWh base unit + expand later: $3,500–$5,000 trade

Hybrid inverter (if not included): $2,000–$4,500 depending on brand and size

Installation labour: 4–8 hours for a straightforward residential battery installation (longer for complex switchboard work or multi-story homes)

Compliance: AS/NZS 5139 commissioning, documentation, labelling, CES

Typical installed price range for a residential battery installation:

System	Installed Price to Customer
BYD 10kWh + Sungrow hybrid inverter	$12,000–$16,000
Tesla Powerwall 3 (incl. solar inverter)	$15,000–$20,000
Sonnen 10kWh	$15,000–$19,000
Battery-only retrofit (add to existing solar, compatible inverter)	$8,000–$13,000

Battery retrofit jobs — adding storage to an existing solar system — are a growing market. Many homeowners who installed solar 3–7 years ago are now looking to add storage. If your existing customer base includes these older solar installs, you have a direct marketing channel to these prospects.

Step 5: Building the Battery Business Model

The solar + battery package

Position battery as part of the system from the first conversation, not an afterthought. When quoting solar, always include a battery option alongside the solar-only price. The “show me the numbers” customer can see both options and decide — and many who hadn’t planned on battery will upgrade when they see the numbers.

The pitch: “The solar-only system pays for itself in 4–5 years. Add a battery and you’re barely on the grid at all — that drops your payback to 6–7 years on a much larger investment, and you have energy security. Here’s both options.”

The retrofit marketing campaign

Email your existing solar customer base (anyone who installed 3+ years ago) with a battery offer. The message: “Your solar system is doing great. In the last few years, battery storage has become much more affordable. Here’s what adding a battery to your existing system would look like and cost.”

Customers who bought from you before already trust you. This campaign costs almost nothing to run and typically converts at 5–15% — a significant revenue opportunity in a slow quarter.

Tracking battery jobs separately

In ServiceM8, set up battery installation as a distinct job type with its own compliance workflow — AS/NZS 5139 checklist, commissioning record, battery-specific CES details, and clearance photos. This ensures every battery job is documented to the same standard. See our guide to digital job management for solar installers for the full workflow setup.

State Incentives for Battery Storage in 2026

Battery storage incentives vary by state and change frequently. Current relevant schemes:

Victoria — Solar Homes Programme: Includes battery rebate for eligible Victorian households. The scheme has been popular and waitlists apply — check the current Solar Victoria portal for eligibility and application process.

South Australia — Home Battery Scheme: SA has historically had strong battery incentives due to high electricity prices and grid instability. Check the relevant SA Government portal for current availability.

ACT — Sustainable Household Scheme: ACT offers interest-free loans for battery storage. Strong uptake in the ACT market.

NSW, QLD, WA: Monitor relevant state government programs — battery incentives at state level are evolving and may emerge or expire. Keeping current on state incentives is a sales advantage.