Solar panel specifications comparison

What is a solar panel size?

Solar panel size is measured in watts (W) and indicates how much electricity the panel can produce under standard test conditions. Here’s the key distinction every homeowner should understand: Most residential solar panels in 2025 come in three main configurations:

What is solar panel efficiency?

Solar Panel Efficiency explained. Solar panel efficiency is the amount of sunlight (solar irradiance) that falls on the surface of a solar panel and is converted into electricity. Due to the many advances in photovoltaic technology over the last decade, the average panel conversion efficiency has increased from 15% to over 24%.

What is the maximum size of a solar panel?

Residential size panels - 54 to 66 cells (108-HC, 120-HC or 132-HC) and 96/104 cell formats. Does not include commercial panels greater than 2.0m in length. Cell efficiency is determined by the cell structure and the substrate type used, which is generally P-type or N-type silicon, with N-type cells being the most efficient.

What does a solar panel datasheet tell you?

The specifications outlined in a solar panel's datasheet provide insights into its expected performance under specific conditions. When shopping for solar panels, it can be hard to identify the most crucial metrics to pick the best solar panel.