Articles tagged "panel technology"

When it comes to buying solar panels for your home, the first thing that manufacturers usually tout is the panel’s efficiency. Solar panel efficiency refers to the amount of sunlight hitting the panel that gets converted into electricity. The intensity of sunlight can be expressed in watts - the same unit used to measure electrical power. For example, if 1,000 watts of sunlight is shining on your solar panel and it generate 200 watts of electricity, the panel is 20% efficient.

If you’ve ever seen a solar panel up close, you might have noticed thin little wires running across each cell. Those little wires do the important job of carrying electrons (electricity) generated by the solar cells into thicker main wires of the panel. You might know from high school science that thin wires have higher resistance, which means they lose more electricity as heat. In a solar panel, that means lower efficiency.

Solar panel manufacturers are always competing against each other to squeeze the most power out of the same size solar panels. If you installed solar panels on your home 10 years ago, you probably had panels with efficiency in the mid-to-high teens (by percentage of light converted to electricity). Today, you can commonly find solar panels that convert more than 20% of the incoming light into electricity, with the current best residential panels hitting nearly 23% efficiency.

Are you a meticulous number cruncher who breaks out the spreadsheet whenever you’re planning a big product purchase? I certainly am. The last time I bought a car, and made a spreadsheet with the specifications of all the car models I was considering. I rank-ordered them in each of the categories that were important to me, and made my decision based on which one performed the best. Figuring out which solar panel is best for you is a little like that, although with this article I hope to make is less complicated for you.

Solar panels don’t have any moving parts. They just quietly sit on your roof or in your backyard for a couple decades and generate electricity, day in and day out. How cool is that? A study by the National Renewable Energy Laboratory shows that new solar panels have a failure rate of only 5 in 10,000 per year. This means that every year, a solar panel has a 0.05% chance of failing, or a total 1.

When you buy an 8 oz bag of potato chips, you generally expect the bag to actually contain 8 oz of chips. Following the same logic, if you have 6 kW of solar panels installed on your roof - about an average size system in the United States - it would seem reasonable to expect that system to actually generate 6 kW of electricity on a clear sunny day. But it works a little differently with solar panels.

If you’ve noticed a neighbor’s roof with solar panels, or just seen pictures of panels, you might notice that they’re very often distinctly blue in color. Why is that? The color of solar panels depends on the type of silicon, the type and thickness of anti-reflective coatings, and the surface texture of the silicon cell. In general, polycrystalline (also known as multicrystalline) solar panels are usually blue, while monocrystalline panels are black.

As a consumer searching for the best solar panels to put on your home, there really isn’t a lot that distinguishes one solar panel from another. If you’re shopping for a car, there’s probably a hundred features, big and small, that make one vehicle different from another. But when it comes to solar panels, it really comes down to a few things: price, warranty, high temperature performance and - probably most notably - efficiency.

When it comes to buying solar panels for your home, there isn’t a lot that obviously differentiates one solar panel from other. If you buy a car, there’s dozens, if not hundreds of different features, styles, and add-on options that you can take into account. But with a solar panel, there’s really only a handful of characteristics that make one product different from another. One of these is the type of material the individual solar cells are made of.

Solar panels are magical things that turn sunlight into electricity. The electrons that flow out of a solar panel move in a steady stream, known as direct current (DC). But because Nikola Tesla and George Westinghouse triumphed over Thomas Edison in what is now called The War of the Currents (they even made a movie out of it!) we use alternating current (AC) in our homes instead of DC. This means that the DC electricity generated by solar panels needs to be converted into AC before your home can make use of it.