Buying solar from a big national brand is a different decision to hiring a local installer. We reviewed seven genuinely national or multi-state companies: Solargain, 1KOMMA5, Solahart, Smart Energy, AGL, Sunboost and Arise Solar, on experience, equipment, installation model, warranties, finance and review patterns. This is independent desk research using company documentation, public records, accreditation registers and customer reviews on Google, SolarQuotes and ProductReview. We did not request quotes or contact any company, and nobody paid for inclusion. By the end you will know which national suits you, where big brands win (finance, accountability, battery bundles), where they lose to good locals (price, crew consistency), and what to ask before signing.
Who is missing: Origin Energy stopped selling residential solar at the end of 2024, per SolarQuotes. Instyle Solar was folded into Nectr after Hanwha’s 2023 acquisition. Esteem Energy is primarily a Sydney operator, covered in our Sydney guide.
The Winners at a Glance
- Best Overall National Installer: Solargain, two decades in solar and the strongest review record here
- Best for Battery Packages: 1KOMMA5, integrated batteries and energy management, long workmanship guarantee
- Best Franchise Network: Solahart, a 70-year-old brand delivered through local authorised dealers
- Best for Finance: Smart Energy, the $0 upfront payment plan specialist, backed by Rinnai
- Best Energy Retailer Option: AGL, solar and batteries bundled with your power plan and VPP credits
- Best Budget: Sunboost, cheap national pricing for buyers who do their homework
- Best Budget Option for WA and SA: Arise Solar, a volume retailer with offices in five states
Comparison Table
| Company | Award | Operating since | Price position | Battery installs | Workmanship warranty | Install model | Best suited for |
|---|---|---|---|---|---|---|---|
| Solargain | Best Overall National | 2005 (solar) | Mid-market | Yes, incl. Powerwall 3 | Not clearly published | Subcontractors (per reviews) | Big-firm service seekers |
| 1KOMMA5 | Best for Battery Packages | 2022 in Australia | Premium | Yes, specialist | 30 years (company claim) | In-house (company claim) | Battery-first households |
| Solahart | Best Franchise Network | 1953 | Mid to premium | Yes | Varies by dealer | Local authorised dealers | National brand, local face |
| Smart Energy | Best for Finance | 2016 | Mid-market | Yes | Not clearly published | Not published | $0 upfront plan buyers |
| AGL | Best Energy Retailer Option | Partner installs since 2018 | Mid-market | Yes | About 5 years (reported) | Third-party partners | One bill plus VPP credits |
| Sunboost | Best Budget | Not published | Budget | Yes | Not clearly published | Contractor network | Price-first, simple roofs |
| Arise Solar | Best Budget for WA and SA | 2014 (registered) | Budget | Yes (Fox ESS) | Not clearly published | Contractor network | Budget buyers, WA and SA |
One honest framing: most companies here rely partly or wholly on subcontracted crews, so the crew on your roof may not be the brand on your contract, and a good local often beats them on price and consistency. Compare with our city guides (Sydney, Melbourne, Brisbane, Perth, Geelong, Central Coast) or our directory before signing.
Best Overall National Installer: Solargain
Solargain is the closest thing Australia has to a national specialist installer with a genuine service culture: in solar since 2005 and licensed in six states and territories. The company says it has installed over 100,000 systems and services over 100 a week, which matters because most solar problems appear years in.
Pros
- 4.3 stars from roughly 1,100 SolarQuotes reviews as of July 2026, the best large-sample record among the nationals
- Dedicated national service department, rare at this scale
- Broad range: panels, Powerwall 3, solar hot water, heat pumps, EV chargers
Cons
- Multiple reviews report subcontracted crews with limited supervision, including roof sealing failures and water leaks
- Workmanship warranty length is not clearly published, so confirm it in writing
- Recurring complaints about monitoring apps not working as promised
Enquire via solargain.com.au, or browse all installers in our directory.
Key facts. Solar since 2005, 23 branches, six states and territories, NETCC approved seller, SAA accredited installers.
Why we selected them. No other national combines this scale and longevity with a real after-sales operation.
Products and brands. Fronius inverters, Jinko and other mainstream panels, Powerwall 3, iStore heat pumps, solar hot water.
Installation quality and reputation. Company crews in some regions, subcontractors in others; reviewers in outer areas report variable oversight.
Pricing and value. Mid-market: reviewers report roughly $5,000 to $11,000 for 6.6kW to 13kW systems before batteries.
Warranty and after-sales. The service department draws recurring praise, but get the workmanship warranty term in writing before paying a deposit.
What customers say. Praise: consultants and scheduling. Complaints: subcontractor supervision, monitoring setup.
Best for / look elsewhere. Buyers wanting a large firm that still answers the phone in year six; look elsewhere if you insist on in-house crews.
Best for Battery Packages: 1KOMMA5
1KOMMA5 is a German-founded group that entered Australia in late 2022 by acquiring established installers, most notably Sydney’s Solaray Energy, and operates across QLD, NSW, VIC, ACT and SA. It sells its own panels, inverters and batteries alongside Tesla Powerwall 3, tied together by its Heartbeat platform that trades your battery against wholesale prices.
Pros
- Battery specialist with its own hardware ecosystem plus Powerwall 3 options
- Claims a 30-year workmanship guarantee through its 1K5 Care program, far beyond the typical 5 to 10 years
- Company states installs are in-house; 4.6 stars from over 2,000 reviews as published on its own site
Cons
- Premium pricing, and own-brand hardware ties you into its ecosystem with less equipment choice
- No coverage in WA, Tasmania or the NT
- Independent review platforms show mixed after-sales response times in busy periods
Enquire via 1komma5.com/au, or browse all installers in our directory.
Key facts. In Australia since 2022, built on installers dating back to 2011, five states and territories, SAA accredited installers.
Why we selected them. Nobody else packages batteries, energy management and wholesale trading this tightly, with the longest guarantee claim of any large operator.
Products and brands. Own-brand TopCon panels to 450W, own hybrid inverters, modular storage to about 42kWh, Powerwall 3.
Installation quality and reputation. In-house per the company, with a strong inherited Sydney reputation; independent reviews run more mixed than its own published rating.
Pricing and value. Premium; compare against a local Powerwall 3 quote using our quote comparison guide.
Warranty and after-sales. The 30-year guarantee is tied to its Care program; read the conditions, maintenance-plan strings are not unconditional cover.
What customers say. Praise: system quality, design advice. Complaints: post-install responsiveness in peak periods.
Best for / look elsewhere. Battery-first households using the federal battery rebate; look elsewhere in WA, or for wide brand choice or a budget price.
Best Franchise Network: Solahart
Solahart has sold solar since 1953, first hot water and now full solar, battery, heat pump and EV charging packages, and sits within the Rheem Australia group. Its model is unique here: a national brand delivered by local authorised dealers who quote, install and service their own territory, with over one million panels installed per the company.
Pros
- 70-plus years of continuous trading, the longest history in Australian solar
- Local dealer model puts an accountable local business behind every install, with national backing
- Certified installers Australia-wide, including regional areas most nationals skip
Cons
- Quality, price and service depend on your territory’s dealer, with no single national review score, so check your dealer’s own Google reviews
- Generally premium pricing versus independent locals quoting comparable hardware
- Narrower battery and inverter selection than a good independent offers
Enquire via solahart.com.au, or browse all installers in our directory.
Key facts. Founded 1953, national authorised dealer network, Rheem Australia group, SAA accredited installers through dealers.
Why we selected them. The dealer network solves the biggest national-brand weakness, remote accountability, while keeping 70 years of warranty backing.
Products and brands. Solahart-branded panels and systems, batteries, solar and heat pump hot water, the PowerStore smart water heater, EV chargers.
Installation quality and reputation. Each dealer’s certified crews do the work: excellent under good dealers, mediocre under weak ones, so review the specific dealer, not the brand.
Pricing and value. Mid to premium; the brand margin buys a warranty chain that has outlived most of the industry.
Warranty and after-sales. Honoured through the dealer network with the national company behind it; terms vary, so get your dealer’s workmanship warranty in writing.
What customers say. Strong national satisfaction per the 2026 Canstar Blue award; complaint themes are dealer-specific, not systemic.
Best for / look elsewhere. Regional buyers wanting brand longevity with a local face; look elsewhere for sharp pricing or wide equipment choice.
Best for Finance: Smart Energy
Smart Energy was founded in Byron Bay in 2016 and acquired by Japanese appliance maker Rinnai in early 2024. Its pitch is finance: $0 upfront, interest-free payment plans designed so repayments are offset by bill savings, with over 500,000 panels and 5,000 batteries installed per the company.
Pros
- The most developed $0 upfront, interest-free plan among the nationals, with Rinnai behind it
- Genuine multi-state office footprint rather than a call centre with contractors
- SAA accredited, broad product range, company-published 4.8 Google rating
Cons
- Interest-free finance is never free: merchant fees are typically built into the system price, so the same hardware is often cheaper for cash from a local
- Door-to-door and phone sales culture draws recurring pressure-tactic complaints, including one widely reported incident of abusive salesperson conduct
- Recurring complaints of monitoring not set up and slow responses once paid
Enquire via smartenergy.co, or browse all installers in our directory.
Key facts. Founded 2016, Rinnai-owned since 2024, 18-plus offices, SAA accredited.
Why we selected them. For households that cannot fund $6,000 to $15,000 upfront, a plan from a manufacturer-backed company is a legitimate path to solar.
Products and brands. Mainstream tier-one panels and inverters, home batteries, heat pump water heaters, EV chargers.
Installation quality and reputation. In-house or subcontracted is not published; complaints concentrate on sales conduct and follow-through, not workmanship.
Pricing and value. Mid-market on headline price, but compare the plan total against a cash quote for identical hardware, both in writing.
Warranty and after-sales. Workmanship warranty length is not clearly published, so confirm it; Rinnai ownership improves the odds your warranty outlives the brand.
What customers say. Praise: smooth installs, clear explanations. Complaints: persistent sales contact, post-payment responsiveness.
Best for / look elsewhere. Cash-poor households who understand the finance trade-off; if you can pay cash, a local will usually beat the plan-inclusive price.
Best Energy Retailer Option: AGL
AGL is Australia’s second biggest energy retailer and one of its oldest companies. It exited in-house solar installation in 2018 and now sells solar and battery packages installed by vetted third-party partners, bundled with electricity plans and its virtual power plant. With Origin gone, it is the main retailer route to rooftop solar.
Pros
- One accountable counterparty for your system, electricity plan and VPP credits
- Interest-free payment options and bundle promotions for existing customers
- 3.9 stars from roughly 115 SolarQuotes reviews as of July 2026
Cons
- Every install is subcontracted, so crew quality varies and AGL sits between you and the installer when things go wrong
- Workmanship cover commonly reported at about five years, half what quality independents offer
- Recurring complaints of slow grid connections, meter delays and evasive after-sales support; interest-free terms have included administration fees
Enquire via agl.com.au, or browse all installers in our directory.
Key facts. Retailer founded 1837, partner-installed solar since 2018, national coverage, NETCC approved seller.
Why we selected them. Some buyers simply want a household name and one bill, and AGL is the most complete retailer offer left, with VPP income stackable on the battery rebate.
Products and brands. Mainstream tier-one panels, inverters and major battery brands, varying by partner and promotion.
Installation quality and reputation. Wholly subcontracted; reviews rate the installs better than the coordination, with the installer-AGL-meter handoff the recurring pain point.
Pricing and value. Mid-market, and AGL is reported to price-match competitor quotes, so get an independent quote first and make them match it.
Warranty and after-sales. The reported five-year workmanship warranty is the weakest spec in this guide, and reviewers describe claims as slow but honoured.
What customers say. Praise: matched pricing, professional crews. Complaints: connection delays, departments not talking to each other.
Best for / look elsewhere. AGL customers valuing bundling and VPP income over lowest cost; look elsewhere for a 10-year workmanship warranty and a direct installer relationship.
Best Budget: Sunboost
Sunboost, operating as Bell Solar Pty Ltd from Blacktown in Sydney’s west, is part of the National Solar Energy Group and sells cheap packages Australia-wide through a contractor network, claiming over 200MW installed. It exists for the buyer who wants the lowest national price on recognisable hardware.
Pros
- Consistently among the cheapest national quotes for standard 6.6kW and 10kW systems
- Recognisable tier-one panel and inverter brands rather than obscure hardware
- Australia-wide reach, with contractor crews drawing more punctual, professional reviews than the price suggests
Cons
- 3.5 stars from roughly 320 SolarQuotes reviews as of July 2026, with after-sales support the dominant complaint and warranty claims reported to drag on for months
- Frequently sells without pre-installation site visits, producing day-of surprises on complex roofs
- Reviewers report pressure for full payment before grid connection paperwork is complete
Enquire via sunboost.com.au, or browse all installers in our directory.
Key facts. Headquartered Blacktown NSW, part of National Solar Energy Group, Australia-wide sales, contractor install network.
Why we selected them. A budget benchmark belongs here, and for a simple single-storey roof with an informed owner the value is real.
Products and brands. Mainstream tier-one panels, budget to mid-range inverters, home battery options.
Installation quality and reputation. Contractor crews, generally competent per reviews, but nobody may see your roof until install day; insist on a site assessment or detailed photos.
Pricing and value. Budget leader; use its quote as your price floor, it shows what hardware really costs after the STC rebate.
Warranty and after-sales. This is where the price is paid: warranty response is the most common serious complaint, and the system is cheap partly because the support is thin.
What customers say. Praise: price, punctual installers, systems performing as quoted. Complaints: unresponsive support, warranty delays.
Best for / look elsewhere. Confident buyers with simple roofs who can self-manage issues; if after-sales support matters, a good local from our directory is worth the extra thousand dollars.
Best Budget Option for WA and SA: Arise Solar
Arise Solar is a Queensland-headquartered volume retailer, registered in 2014, with offices in NSW, Victoria, SA and WA. That footprint is its differentiator: budget national pricing with an actual office in Perth and Adelaide, where east coast phone retailers often struggle to deliver.
Pros
- Budget pricing, with reported costs from about $3,800 for entry 5kW systems to around $11,200 for 20kW
- Physical offices in five states, unusual for a budget retailer
- Install crews earn frequent praise for tidy, punctual one-day jobs
Cons
- 3.4 stars from roughly 330 SolarQuotes reviews as of July 2026, the lowest here and sharply polarised (113 five-star against 98 one-star)
- Repeated reports of missed deadlines costing customers rebate windows, plus deposit-then-silence communication failures
- Narrow equipment menu built around Fox ESS, a value brand with a shorter Australian support record than Fronius or Sungrow
Enquire via arisesolar.com.au, or browse all installers in our directory.
Key facts. Registered 2014, Queensland HQ, offices in five states, contractor install network.
Why we selected them. WA and SA buyers wanting a budget national quote deserve an option with a local office; check it against our Perth guide and South Australia page.
Products and brands. LONGi and Suntech panels with Fox ESS inverters and batteries currently; Growatt and SolaX appear in older installs.
Installation quality and reputation. Contractor crews with polarised results: good outcomes are fast and clean, bad ones follow a pattern of delay and silence rather than dangerous work.
Pricing and value. Firmly budget; the value case depends on your tolerance for schedule risk.
Warranty and after-sales. Post-sale support is the consistent weakness, including reported inverter warranty friction on older installs; get every date and term in the contract.
What customers say. Praise: price, efficient install days. Complaints: missed deadlines, unreachable staff after deposit, warranty friction.
Best for / look elsewhere. Price-driven WA and SA buyers who lock dates and terms into the contract; look elsewhere if a missed rebate deadline would sink your budget.
How We Reviewed
We shortlisted every solar retailer with a credible claim to national or five-state coverage, then verified current trading status from each company’s own website. The seven remaining companies were assessed on reputation and years operating, equipment quality, installation model, pricing signals, warranties, finance, customer service and after-sales support. Sources were company websites and documentation, the Solar Accreditation Australia and New Energy Tech Consumer Code registers, and review patterns on Google, SolarQuotes and ProductReview as of July 2026. We did not request quotes, contact companies, or accept payment from anyone reviewed. Unverifiable facts are marked “not published”, and company-published figures are labelled as such. There is no points system; awards reflect judgement about fit for specific buyers.
Choosing Between a National Company and a Local Installer
Accreditation first. Your company must be a New Energy Tech approved seller using SAA accredited installers (accreditation moved from the Clean Energy Council to Solar Accreditation Australia in 2024). Rebates depend on it.
Ask who is actually on the roof. Is the crew employed, a dealer, or a subcontractor, and who holds the electrical licence? Get it in writing.
Compare workmanship warranties, not product warranties. Panels carry 25-year manufacturer warranties everywhere. Workmanship cover is what fixes a leaking roof penetration: quality independents commonly offer 10 years, AGL is reported around five, 1KOMMA5 claims 30 with conditions.
Price the finance separately. Interest-free plans embed costs in the system price. Get a cash price for the same hardware from a local via our directory before judging any plan.
Check state extras and your network operator. The STC rebate applies everywhere and the Cheaper Home Batteries Program discounts batteries nationally from July 2025, but state schemes and export rules differ. Your DNSP (Ausgrid, Energex, Western Power and others) sets export limits that should shape system design.
Get three quotes, mixed. One national plus two locals from your state’s top installer list. Our guides on choosing an installer and comparing quotes cover the rest.
FAQ
Are big national solar companies better than local installers? Not automatically. Nationals win on finance, brand longevity and battery bundles; good locals usually win on price, crew consistency and responsiveness. Quote both.
How much should a solar system cost in 2026? After the STC rebate, quality 6.6kW systems typically land between about $4,000 and $9,000. Batteries add more, reduced by the federal battery rebate. Treat quotes far below the budget nationals here as a warning sign.
How many quotes should I get? Three minimum: at least one national and one well-reviewed local. Identical hardware can vary by thousands.
Which warranty actually matters? Workmanship, then inverter, then panels, in order of likely use. Only workmanship cover fixes roof penetrations and cabling. Ten years is the benchmark.
Is the cheapest national retailer safe? The hardware is usually genuine and most installs are fine. The risk is service: slow warranty claims, no site visit, thin support. Buy budget only if you can self-manage issues.
What happens if my solar company goes bust? Manufacturer warranties survive with the maker, provided it has an Australian office. Workmanship warranties usually die with the company, an argument for long-lived or manufacturer-backed firms.
Should I install a battery now or later? The Cheaper Home Batteries Program has cut installed prices since July 2025, tilting the maths toward now for households with evening usage. Run the numbers in our battery rebate guide and keep any solar-only system battery-ready.
How big a deposit is reasonable? Ten per cent or less is standard. Be wary of full-payment demands before installation and grid connection paperwork are complete.
What are the red flags in a quote? No site visit or roof photos, no named installer or electrical licence, workmanship warranty under five years, finance quoted without a cash comparison, same-day signing pressure, and vague dates near rebate deadlines.
About This Review
Written by the Solar Cobber editorial team. Last updated July 2026. Solar Cobber is a free, independent Australian solar directory. We may earn referral or advertising fees from installers listed on this site, but commercial relationships never influence rankings, awards or review content; no company here paid for placement, was contacted, or saw this article before publication. Sources: company websites and documentation, the Solar Accreditation Australia and New Energy Tech Consumer Code registers, and review patterns on Google, SolarQuotes and ProductReview, as of July 2026. Spot an error? Contact us and we will review it.