Second Hand not Second Best

Advice from the Experts at GreenLoop Energy

At GreenLoop Energy, we believe that quality renewable energy should be accessible, affordable, and sustainable. That’s why we supply carefully tested and graded second-hand solar panels — and help you make confident choices.

🏷️ What Are the Best Brands of Solar Panels?

We work with trusted panels from some of the most reliable solar manufacturers, including:

• SunPower – Premium, high-efficiency panels with long-lasting performance
• LG – Top-tier quality and strong durability
• Panasonic – Known for excellent technology and output consistency
• REC – Excellent value and performance for mid-to-premium panels
• Canadian Solar – Widely used globally with dependable output
• Jinko Solar – Affordable, reliable, great for budget setups
• Q CELLS – Balanced quality and cost, popular in the UK
• Trina Solar – Durable, consistent, and widely used on solar farms

We only stock brands we trust — and test everything ourselves.

⚡ What Size Panel Should You Choose?

We offer a range of panels from 280W to 400W+. 

Here’s a quick guide:

250–280W Best for smaller setups, off-grid cabins, tight budgets

300–340W All-purpose use, homes, farms, DIY

350–400W+ Premium performance, newer systems

Tip: The higher the wattage, the fewer panels you’ll need for the same power.

💎 Panel Grades Explained

Every panel we sell is visually inspected and electrically tested. We grade them based on output and condition:

• ✅ Grade A: 90–100% of original output, excellent condition
• ✅ Grade B: 75–89%, minor cosmetic wear
• ✅ Grade C: 60–74%, budget-friendly for DIY and off-grid use

Each panel comes with its own performance report.

🔍 What Should You Look for?

Here’s what to consider when buying second-hand solar panels:

• Output: Choose panels that match your energy needs and space
• Condition: Ask for test reports and check for visible damage
• Brand reputation: Go with known, reliable brands
• Size and voltage: Make sure your system components are compatible
• Support: Choose a supplier who tests, grades, and supports you after the sale

We provide transparent testing results, warranty options, and ongoing advice — because we want your solar setup to succeed.

🛠️ DIY or Professional?

• DIY Setup: Pair your panels with one of our controller kits or inverter bundles
• Professional Install: We can recommend trusted local installers in Wales and beyond

🔄 Want to Trade In or Sell Your Panels?

We also buy used panels. If you're upgrading, downsizing, or decommissioning, contact us to request a quote.