Grape Solar’s warranty is right in the middle range of the marketplace, at 10 years. For example, on EnergySage approximately a third of the panels offered by our top 25 manufacturers come with a 25-year warranty. Most companies, including Grape Solar, offer a 10-year materials warranty, but the best solar panel manufacturers will guarantee against equipment failures for 15 or even 25 years. A solar panel’s materials warranty (sometimes referred to as the product or equipment warranty) protects you against equipment failures due to manufacturing defects or environmental issues. Whether you’re buying a new TV, a car, or solar panels for your roof, you should expect that the manufacturer will stand behind their product with a strong warranty. Grape Solar panels have a temperature coefficient that ranges from -0.45 to -0.38, which is near the mid-range seen in the EnergySage Solar Marketplace. While 95° F might seem high to you, remember that the surface of your roof can get much hotter than the air around it when the sun is beating down on it.Ī lower temperature coefficient is better, and the best solar panels available on the market have a temperature coefficient of -0.25.

If the temperature increases to 35° C (or 95° F), Grape Solar panels will produce five percent less electricity.

This means that if your solar panel’s temperature increases by one degree (from 25° C to 26° C), its electricity production will fall by 0.5%. For every degree above 25° C, your solar panel’s electricity production will decrease by the temperature coefficient.įor example, Grape Solar’s GS-S-160-Fab8 model has a temperature coefficient of -0.5. The temperature coefficient gives you a sense of how your panel’s performance will degrade during hot summer days. Solar panels are like any other kind of electronic equipment: they operate most efficiently when they are kept cool (ideally around 25° C or 77° F). The temperature coefficient tells you how well your solar panels will perform in less-than-ideal conditions. Our review of Grape Solar panels found that they have an efficiency rating of anywhere from 14.63 percent to 18.4 percent. As you can see, the most common solar panels out there fall between 14 and 18 percent panel efficiency, and Grape Solar panels fit comfortably within that range. The graph below shows how Grape Solar panels measure up when compared to 24 of the most popular solar panel brands offered to solar shoppers on the EnergySage Solar Marketplace. The best solar panels available on the market today operate at approximately 22 percent efficiency. A higher efficiency rating is better, because it means that your solar panel is able to convert more of the sunlight it captures into electricity. Solar panel efficiency refers to how well your solar panel can convert sunlight into usable electricity. To help you understand Grape Solar panel quality, we’ve analyzed the technical specs of their panels and compared them to other leading panel manufacturers offered on the EnergySage Solar Marketplace.

There are four key metrics to consider when evaluating solar panel quality: (1) panel efficiency, (2) warranty, (3) performance, and (4) price. How Grape Solar reviews compare to other panel manufacturers But before you make a Costco solar purchase, we recommend you learn more about how Grape Solar panels compare to other solar panel brands. One of the most popular DIY options is to purchase a solar panel kit from Grape Solar, an Oregon-based solar panel manufacturer whose products are for sale at Costco and Home Depot. Now that you can buy solar panels at Costco and Home Depot, you may even be considering installing a home solar energy system yourself. Installing solar panels is fast becoming a home improvement project that any homeowner can take on.

Grape solar off grid solar panel kit