If your solar panel doesn’t match the exact dimensions listed, this is usually normal and not a fault.

Here’s why.

? 1. Manufacturing Tolerances

Solar panels are mass-produced, and small size variations are normal.

? Typical tolerance:

• ±5–20mm difference

? 2. Frame vs Cell Size

Panel dimensions include:

• Aluminium frame
• Junction box
• Mounting gaps

? The actual active solar cells are smaller

⚡ 3. Same Wattage, Different Sizes

A 300W panel may vary in size depending on:

• Cell efficiency
• Technology (PERC, TOPCon, Shingled)
• Manufacturer design

? Higher efficiency panels = smaller size

? 4. Flexible vs Rigid Panels

Flexible panels are often:

• Slightly smaller
• Different thickness
• No frame

⚠️ When It IS a Problem

Contact support if:

• Size is drastically different (100mm+)
• Wattage label is missing
• Output is extremely low

? What to Provide

To speed up support:

• Photo of panel front
• Label/spec sticker
• Measurement photo
• Output reading

? Key Takeaway

Small size differences are normal — output performance matters more than dimensions

? ARTICLE 3 (From #4)

Are Your Solar Panels True Wattage? (How To Verify Before Buying)

? Overview

We often get asked:

“Are your solar panels actually true wattage?”

This guide explains how to verify solar panel performance and avoid low-quality panels.

⚡ What “300W Panel” Actually Means

Solar panels are rated under STC (Standard Test Conditions):

• 1000W/m² sunlight
• 25°C cell temperature
• Perfect angle

? These conditions are rarely achieved in real life

?️ Real-World Output in Australia

Typical output:

? How to Test True Output

Step 1: Measure Open Circuit Voltage (VOC)

• Should match spec sheet

Step 2: Test Under Load

• Use MPPT controller + battery

Step 3: Check Midday Output

• Best test between 11am–2pm

? Signs of Low-Quality Panels

• No label/spec sheet
• Extremely low voltage
• Output under 50% in good sun
• Incorrect dimensions

✅ What We Do Differently

• Panels tested before dispatch
• Verified specs
• Australian condition performance focus

? Important

A panel producing less than rated wattage is normal
A panel producing extremely low output is not

? Related Articles

• How to Test a Solar Panel
• Solar Panel Troubleshooting Guide