Are Second-Hand Solar Panels Worth It?

Many UK homeowners, landlords, and small business owners are drawn to pre-used photovoltaic (PV) modules as a budget-friendly way to reduce energy bills and embrace sustainable power. But, are second-hand solar panels worth it?

While pre-owned solar systems might seem like a cost-effective alternative to brand-new installations, it's essential to weigh the potential savings against hidden risks like reduced performance and limited access to incentives. 

In this guide, we'll dive into the pros, cons, and key considerations to help you decide if refurbished solar panels align with your goals.

Are Second-Hand Solar Panels Worth the Investment?

Purchasing second-hand solar PV panels can appeal to those seeking affordable renewable energy solutions, but it often depends on your specific circumstances. 

For budget-conscious homeowners looking to cut upfront expenses, or DIY enthusiasts experimenting with off-grid setups for sheds, cabins, or caravans, pre-owned PV panels might offer an entry point into solar power. 

Yet, for landlords aiming to boost EPC ratings or small farms hoping to lower operational costs, the long-term value could be questionable due to factors like efficiency loss and compliance issues.

Statistics from the UK government show that solar deployment reached 18 GW by February 2025, marking a 2 GW increase in just six months. This surge highlights growing adoption, but most installations involve new panels eligible for schemes like the Smart Export Guarantee (SEG). 

Used panels, often sourced from marketplaces like eBay or Gumtree, may not meet these standards, potentially limiting your financial benefits.

Before deciding, consider your energy needs and property type. A typical 4kW system for a 2-3 bedroom house can generate around 3,500-4,000 kWh annually in the UK, depending on location. With second-hand panels, output might be lower due to age-related degradation.

What Are the Advantages of Second-Hand Solar Panels?

Refurbished solar PV modules can provide several benefits, particularly for those prioritising initial savings over long-term guarantees.

Here's a quick overview:

One key advantage is the lower upfront cost. Used panels are often available at 30-70% less than new ones, making solar more approachable for cost-sensitive users like landlords with older properties or small business owners equipping outbuildings. 

For instance, while a new 4kW system might cost £6,000-£8,000 according to the Energy Saving Trust, second-hand equivalents could be sourced for under £3,000, excluding installation.

Environmentally, opting for reused panels reduces waste by extending the life of existing materials. The UK government's push for circular economy practices supports this, as repurposing prevents functional modules from ending up in landfills.

Additionally, a faster return on investment (ROI) is possible due to reduced initial outlay. With energy prices at 25.73p per kWh as of July 2025, even slightly less efficient used systems can pay back quicker in high-sunlight areas like the South East, which has over 215,000 installations.

What Are the Drawbacks of Second-Hand Solar Panels?

Despite the appeal, used solar panels come with notable risks that could outweigh the savings for many users.

Efficiency degradation is a primary concern. Solar panels lose about 0.5-0.8% efficiency annually, so a 10-year-old panel might operate at only 90-95% of its original capacity. This means lower energy output and reduced bill savings over time, especially in the UK's variable weather.

Lack of warranty is another issue. New panels typically come with 25-year performance guarantees, but second-hand ones often have none, leaving you vulnerable to faults. According to Solar Energy UK, proper maintenance is crucial, but without coverage, repair costs can add up.

Compliance challenges arise too. Most used panels don't qualify for Microgeneration Certification Scheme (MCS) approval, which is required for incentives like Smart Export Payments (SEG) payments. Ofgem states that SEG eligibility demands certified installations, potentially excluding second-hand systems from export tariffs.

Installation and insurance risks also factor in. Insurers may hesitate to cover non-certified setups, and for property investors, this could affect resale value or EPC improvements.

Use our Solar Panel Calculator to find the ideal system size for your home and see how much you could save on electricity bills.

How Do Second-Hand Panels Compare to New Ones?

When comparing refurbished solar systems to brand-new PV installations, several factors highlight why new solar panels might offer better long-term value.

In terms of efficiency, new panels boast 20-22% ratings, while used ones could be 15-18% after degradation. Longevity favours new solar panel systems, with 25-30 year lifespans versus 15-20 for pre-owned.

Cost-wise, new installations average £6,600-£8,100 for 4kW, but include warranties and incentives. Used might save initially but incur higher maintenance.

ROI for new panels is stronger with SEG, where you can earn for exported energy. The UK government reports solar saved households around one tonne of CO2 yearly.

Can Second-Hand Solar Panels Qualify for UK Government Schemes?

Access to incentives is a major differentiator. The Smart Export Guarantee, administered by Ofgem, requires MCS certification for payments on exported electricity. Most second-hand panels fail this, as they lack original compliance documentation.

According to the UK government, SEG can provide £100-£300 annually for a typical system, but only for certified setups. For grants like those from the Energy Saving Trust, new installations are prioritised.

This makes new panels more attractive for homeowners and landlords seeking maximum returns.

Should You Buy Second-Hand Solar Panels in the UK?

For most UK homeowners and landlords, second-hand solar panels are not worth it due to:

• Lack of government incentives.
  
• Uncertainty around performance and safety.
  
• No warranties or installer support.

While they may appeal to DIY enthusiasts or off-grid hobbyists, most people searching for solar will benefit far more from new, MCS-certified systems that guarantee efficiency, compliance, and long-term returns.

Before making a decision, use Eco Answers’ free Quote-Comparison Tool to see real-world costs for certified solar installations. You may find that financing, grants, and lower energy bills make new solar panels more affordable than you think.

What Factors Should You Consider Before Buying Second-Hand Panels?

Buying used solar panels can seem like a shortcut to saving money, but the considerations vary depending on who you are and what you want to achieve. Below, we break it down for different audiences.

Homeowners: Roof Suitability & Energy Usage

• Roof orientation & shading – South-facing roofs generate the most solar energy in the UK. If your property suffers from heavy shading (trees, chimneys, nearby buildings), second-hand panels may deliver even poorer returns.
  
• Energy demand vs. panel output – Calculate your household’s annual electricity usage (from your energy bills) and compare it to the reduced efficiency of second-hand panels. A system that no longer produces its full output may fail to cover your needs.
  
• Resale value – According to the UK Government’s research on energy efficiency, properties with effective renewable systems can increase in value. But uncertified, second-hand panels may not be recognised on the market.
  

Landlords: EPC Ratings & Compliance

• Improving EPC scores – Solar can improve a property’s EPC rating, which is important under the Minimum Energy Efficiency Standards (MEES) for rentals. However, uncertified systems may not be counted.
  
• Warranties & tenant safety – Landlords have a duty of care. Using second-hand panels with no warranty or certification could lead to compliance issues if faults arise.
  
• Insurance implications – Many insurers will not cover non-MCS installations, leaving you liable for damages.
  

DIY Enthusiasts & Off-Grid Hobbyists

• Visual inspection – Check for cracks, delamination, discolouration, and hotspots. Even small defects can drastically reduce performance.
  
• Testing equipment – A multimeter or I-V curve tracer can help measure actual output before purchase.
  
• System compatibility – Ensure voltage and current ratings match your inverter or battery system. Mismatching different voltage solar panels may be unsafe or underperform.
  

Small Businesses & Farms

• Infrastructure compatibility – Older panels may not integrate easily with modern inverters, battery storage, or monitoring systems.
  
• Operational reliability – For warehouses, barns, or refrigeration, downtime from faulty second-hand panels could disrupt operations.
  
• Financial planning – With SEG payments and tax allowances often requiring MCS-certified systems, second-hand panels may not deliver the ROI businesses expect.

Industry Insight: Between January and May 2025, UK solar generated a record 7.6 TWh of electricity (Ofgem). This highlights that when properly installed and maintained, solar technology is both reliable and highly productive, a reminder of the importance of certified, quality systems over risky second-hand purchases.

FAQs

How do I test the performance of used solar panels before purchase?

Use a multimeter to check voltage and current output under sunlight. Professional inspections can reveal hidden issues like micro-cracks.

Are there any tax implications for installing second-hand solar panels?

In the UK, VAT on used panels is typically 20%, but no specific tax breaks apply unlike for new MCS-certified systems.

What maintenance is required for second-hand solar panels?

Regular cleaning every 6-12 months and annual electrical checks are essential, as older panels may accumulate dirt faster affecting output.

Can second-hand panels be upgraded with modern inverters?

Yes, but compatibility must be verified by a qualified electrician to ensure safe integration and optimal performance.

Our Verdict

Ultimately, while second-hand solar panels offer an affordable entry into renewables, their limitations in efficiency, warranties, and incentive eligibility often tip the scales towards new systems for superior long-term value and reliability. 

By considering your unique needs and exploring professional quotes, you can confidently invest in a solution that maximises savings and sustainability.