Solar Water Heater
Photovoltaic solar panels absorb sunlight as a source of energy to generate electricity. A photovoltaic (PV) module is a packaged, connected assembly of typically 6×10 photovoltaic solar cells. Photovoltaic modules constitute the photovoltaic array of a photovoltaic system that generates and supplies solar electricity in commercial and residential applications.
Most solar panels for sale today are made of either 60 or 72 PV cells. 60-cell solar panels measure close to 40” x 66”, while 72-cell solar panels are approximately 40” x 78” (give or take an inch based on the manufacturer). You should care about panel size if you have limited space to build your system. For example, the dimensions of your roof may require you to use one option over the other, based on how the array is laid out on your roof.
This applies to full-sized solar panels for home or business use. We also carry smaller 12V solar panels for RV, marine, and remote industrial applications. 12-volt solar panels are available in sizes from 5-160 watts, and select 24-volt panels are available up to 190 watts.
Solar panel efficiency ratings measure how much sunlight the panel can convert into usable energy. If you compare two panels that are the same size, the higher efficiency panel will produce more power. High-efficiency panels help you fit more solar into a smaller space. Check the spec sheet to compare solar panel efficiency ratings. Solar panels come in a broad range of sizes, with most falling between 275W-400W. Smaller panels cost less, but they might not necessarily give you the best deal in terms of energy generated per dollar spent.
To compare solar panels on a level playing field, divide the panel price by its wattage to find the cost per watt. This will help you figure out which panel represents the best deal, regardless of factors like size and efficiency rating.