Are They Worth It?
With electricity prices remaining volatile across the UK, more South East homeowners are exploring different ways to cut energy bills. Solar remains one of the most effective long term solutions – but what about second hand solar panels?
At SolarTherm UK, we’re often asked whether buying used solar panels is a smart way to reduce upfront costs. The answer isn’t straightforward. While there are potential savings, there are also technical, financial and compliance considerations that many homeowners may overlook.
This guide breaks down everything you need to know – particularly if you’re based in Essex, Kent or the wider South East.
What Are Second Hand Solar Panels?
Second hand solar panels are photovoltaic (PV) modules that have previously been installed and later removed from a solar system. This might happen due to:
- System upgrades
- Property renovations
- Commercial site decommissioning
- Insurance replacements
- Fault investigations
Once removed, these panels may be resold privately or through resellers.
Used vs Refurbished Solar Panels
It’s important to distinguish between used and refurbished solar panels. Used panels are previously installed and removed, they are sold as-is, without any testing. Refurbished solar panels are tested, repaired (where necessary) and certified for reuse. Refurbished units may offer more reliability, but they still rarely come with the same manufacturer warranty coverage as brand new panels.
Why Second Hand Solar Panels Appeal
In areas like Essex and Greater London, installation costs can be higher due to scaffolding, labour rates and access complexity. That’s why second hand panels can appear attractive.
Potential Benefits
- Lower purchase cost
- Useful for DIY or off-grid projects
- Budget friendly for system expansion
- Environmentally conscious reuse
However, the panel price is only one part of the equation.
The Hidden Costs Many People Miss
Even if the panels are cheaper, installation costs remain largely the same across the South East. You’ll still need scaffolding, mounting hardware, inverter compatibility and electrical testing. An MCS certificate and DNO approval is also required if you wish to connect your system to the grid.
Labour costs in the South East typically remain consistent whether panels are new or used. This means overall savings may be smaller than expected.
Performance and Degradation: What to Expect
Solar panels degrade gradually over time – typically around 0.5% every year. A 15 year old panel may have already lost 7-10% of its original output. Newer panels also deliver significantly higher wattage per panel than older models. A modern panel may produce 420W or even higher, whereas older units might only offer 250-300W.
In practical terms, that means more roof space is needed for the same output, your system may generate less energy and return on investment may take longer. Also, you need to expect your system to need replacing sooner as the panels have already used some of their lifespan.
Legal and Compliance Requirements in the UK
If you want to connect your system to the grid in England or Wales, compliance is critical.
Microgeneration Certification Scheme (MCS)
To qualify for export payments and ensure system safety, installations must comply with MCS standards. Used panels can make certification more complicated.
Smart Export Guarantee (SEG)
You can only receive export payments if your system meets supplier requirements. Some energy providers may request proof of compliance and installation standards.
Without proper certification, you may not qualify for SEG payments and your home insurance may be affected. If you come to sell your property in the future, you may find it harder to sell without proper certification. This is particularly important in the South East property market, where buyer surveys are thorough and documentation is scrutinised.
How to Test Second Hand Solar Panels
If you are considering used panels, testing is essential.
Visual Inspection
Check for:
- Cracked glass
- Delamination
- Corrosion
- Water ingress
- Burn marks on junction boxes
Open Circuit Voltage (Voc) Test
Using a multimeter in sunlight, compare the measured voltage to the manufacturer’s specification label.
Short Circuit Current (Isc) Test
Measure current output under direct sunlight and compare with the rated current. Significant deviation may indicate internal damage or cell degradation. Professional testing is strongly recommended before committing.
VAT Considerations
VAT treatment varies depending on circumstances. While new residential solar installations currently benefit from zero VAT in many cases, used equipment may not always qualify under the same conditions. It’s important to confirm current VAT guidance before purchasing, especially if panels are sold privately.
Are Second Hand Solar Panels Worth It?
In some very niche cases they can be. Second hand solar panels can be worth it for off-grid workshops or outbuildings, temporary installations or DIY enthusiasts. If you’re expanding an existing array and require identical panel models, sometimes sourcing second hand panels is the only way to achieve this.
However, for most homeowners looking for long term energy savings, full warranties and SEG payments, MCS certified installers are able to provide a better service offering everything required to keep your system running efficiently for 30 years or more. New panels are typically the more secure investment.
The difference in cost between second hand and new solar panels is 30-50% difference, but the lifetime return on investment is far higher for new panels. Modern systems installed professionally will deliver better lifetime value, even if the upfront costs are slightly higher.
The SolarTherm UK Perspective
At SolarTherm UK, we do not supply or install second hand solar panels. Our focus is on delivering high efficiency modern PV systems, with longer than average manufacturer warranties. Our MCS certified installers use local knowledge to install your system bespoke for your property and local weather conditions. SolarTherm UK provides a full service, from initial enquiry, to a detailed quote including EPVS verified performance estimates. Our dedicated team handle all paperwork, ensuring your system is MCS compliant and ready to be connected to the grid for export.
Given the strong sunlight levels experienced in the South East, a properly designed modern system can significantly outperform older used panels – maximising export income and long term savings.
Final Thoughts
Second hand solar panels may appear to offer a quick saving, but when considering compliance, performance, installation costs and long term efficiency, the difference can narrow considerably.
If you’re based in Essex, Kent or the wider South East and considering solar, it’s worth evaluating the full system lifecycle cost rather than focusing purely on panel price, after all, your solar panels are the cheapest part of your installation.
Contact SolarTherm UK today for a free, no obligation quote and design, tailored to your property, usage and future energy needs. No hard sell, just honest, expert advice – and the time you need to make an informed decision.
Your home. Your energy. Your future.
