Honest answer first: For a grid-connected Melbourne home, used panels rarely make financial sense once STCs are factored in. This page tells you exactly when they do and don't — and what Supply Solar does with panels removed during upgrades.
Used Solar Panels —
Buy, Sell & Recycle
Everything you need to know about second-hand solar panels in Melbourne — whether they're worth buying, how to sell or dispose of your old panels, and Supply Solar's buyback and recycling program for removed panels.
Used Solar Panel Enquiries
Tell us what you need — we'll give you an honest answer.
Thinking of buying used panels?
Tell us your situation — off-grid, rural, temporary, or grid-connected — and we'll advise on whether used panels make sense for you, or whether new with STCs is the better option.
Email us → [email protected]Have panels to sell or dispose of?
Upgrading your system and have working panels to sell? Or need responsible disposal for end-of-life panels? Contact Supply Solar for a buyback or recycling assessment.
Call 0484 372 744Want new panels instead?
If you're looking to install solar for the first time or upgrade, new panels with STCs applied are almost always the better financial choice. Get a new system quote.
View new solar systems →Honest advice · No sales pressure · Melbourne & Regional Victoria
The Honest Answer
Are Used Solar Panels Worth Buying?
The answer depends entirely on your situation. Here are the three scenarios — with an honest assessment of each.
Grid-connected Melbourne home — usually no
For a standard residential installation connected to the Melbourne grid, used panels are rarely the better option. New panels with federal STCs applied are often cheaper in real terms than used panels without STCs. Add the warranty difference and the performance degradation on older panels, and used panels rarely win on economics for grid-connected homes.
Supplements, experiments, or temporary — sometimes
Adding a small array to an existing off-grid shed, workshop, caravan, or campsite where STCs wouldn't meaningfully apply anyway, or for a short-term or temporary purpose — used panels can offer reasonable value here. The absence of STC eligibility is less relevant when the installation wouldn't qualify in large numbers regardless.
Off-grid rural or charitable applications — yes
Remote rural properties with high installation costs, charitable projects in developing regions, or community projects where budget is the primary constraint and STC eligibility is limited — used panels in working condition make genuine sense. Supply Solar's export program directs suitable panels to these applications.
Why STCs Matter
The STC Calculation That Changes Everything
The reason used solar panels rarely make financial sense for Melbourne grid-connected installations is straightforward: federal Small-scale Technology Certificates significantly reduce the upfront cost of new panels. Used panels get none of this.
New panels vs used panels — the real comparison
Our Panel Program
What Supply Solar Does with Removed Panels
When Supply Solar replaces or removes panels during upgrade and maintenance projects, every panel goes through a deliberate process — not to landfill. This was recognised as part of our 2023 CEC Collaboration Award.
Panels That Pass Testing
Panels removed in physically good condition are cleaned, visually inspected, and output-tested. Those that produce above a minimum threshold and show no glass cracks, delamination, or major hot spots are assessed for export or reuse.
Selling Your Old Panels
If you're upgrading your system and want to sell your old panels rather than simply dispose of them, Supply Solar can assess them for potential buyback. The secondary market for residential panels is limited — we'll give you an honest assessment of value rather than a misleading number.
End-of-Life Panels
Panels that are cracked, have significant delamination, major hot spots, or produce below our minimum output threshold are not sent to landfill. They go to certified e-waste recycling facilities that recover silicon, glass, aluminium framing, copper wiring, and other materials.
Typical output as % of rated capacity — Tier 1 panels (0.5%/yr degradation)
Performance warranty standard: Tier 1 manufacturers warrant at least 80% of rated output at 25–30 years. Actual degradation for quality panels is typically 0.5%/yr — a 10-year-old panel produces approximately 95% of its rated capacity.
How Long Do Solar Panels Last?
Solar Panel Lifespan & Degradation
Understanding how solar panels age is essential before deciding whether used panels are worth the investment — or before deciding what to do with your existing panels.
Tier 1 panels: ~0.5% output loss per year
Quality Tier 1 solar panels from major manufacturers degrade at approximately 0.5% per year. A 10-year-old Tier 1 panel produces around 95% of its original rated output. This degradation is gradual, predictable, and well within the performance warranty window.
Budget panels degrade faster — and less predictably
Budget panels from the 2010–2015 solar boom often used lower-grade EVA lamination, cheaper backsheets, and lower-quality busbars. These can show accelerated delamination, discolouration, and hotspot development — particularly on darker Melbourne rooftops. A 10-year-old budget panel may perform significantly below 95% of its rated output.
Most panels outlive their warranties
Well-maintained Tier 1 panels typically remain functional well beyond 25 years — at reduced but still meaningful output. This long lifespan means that removing a working 10-year-old panel from a home system during an upgrade often produces a panel with 15+ years of remaining life. Supply Solar's export program aims to put that remaining life to use.
How to Dispose of Old Solar Panels
Panel Recycling in Victoria
How Do I Dispose of Old Solar Panels?
Solar panels replaced during upgrades, damaged in storms, or removed from demolition projects need responsible disposal. Sending them to landfill wastes recoverable materials and is increasingly restricted as e-waste regulation tightens in Victoria.
Supply Solar manages panel recycling for all projects we work on — and for panels removed by other installers where the homeowner has no disposal pathway. Contact us to discuss your situation.
2023 CEC Collaboration Award: Supply Solar received the Clean Energy Council Collaboration Award in 2023, partly in recognition of our panel reuse and recycling program — ensuring panels removed during upgrade projects don't end up in landfill.
Side by Side
New Panels vs Used Panels — Full Comparison
A complete comparison to help you make the right decision — based on actual economics, not assumptions.
| Factor | New Panels (CEC-accredited installer) | Used / Second-Hand Panels |
|---|---|---|
| STC entitlement | ✓ Full STC discount applied at installation | ✗ No STCs — previously claimed or pre-scheme |
| Solar Homes Program rebate | ✓ Eligible (income and property criteria apply) | ✗ Not eligible on used equipment |
| Manufacturer product warranty | ✓ 10–15 years (Tier 1 brands) | ✗ None — warranty doesn't transfer to new owner |
| Performance warranty | ✓ 25–30 years, 80% output guaranteed | ✗ No warranty coverage on resale |
| Output at installation | ✓ 100% of rated capacity | ~90–97% depending on age and condition |
| CEC installer willing to certify | ✓ Yes — fully certifiable installation | ✗ Most CEC installers decline (liability issue) |
| Monitoring and quality assurance | ✓ Full factory QA on new panels | Varies — visual and output test only |
| Home insurance implications | ✓ No issue | Check with insurer — non-certified installs may be excluded |
| Best suited to | Grid-connected residential and commercial | Off-grid, rural, temporary, charitable applications |
Decision Guide
When Used Panels Make Sense — and When They Don't
Used panels can make sense when...
Used panels usually don't make sense when...
FAQ
Used Solar Panels — Common Questions
Consider Instead
Better Options for Most Melbourne Homes
If you're looking to install solar or expand an existing system, these are the most common paths Supply Solar recommends — with STCs applied.
New Residential Solar
6.6kW to 20kW new solar systems with full STCs, Solar Homes rebate applied, and manufacturer warranties. CEC-accredited installation across Melbourne.
View new solar systems →Solar System Upgrades
Already have solar and want more? Upgrade your existing system with new panels and STCs on the added capacity. Supply Solar assesses your inverter headroom first.
View solar upgrades →Solar Maintenance
Before replacing your panels, book a service. Many systems that appear to need new panels just need a clean, isolator check, and inverter service to restore full output.
View solar maintenance →Thinking About Used Solar Panels?
Get an Honest Answer First.
Supply Solar gives you straight advice — not a sales pitch. If used panels make sense for your situation, we'll tell you. If new panels with STCs are the better choice, we'll tell you that too.