Solar panels are placed at an angle to maximize the sun's energy.
For example, at 26°C (79°F) the REC Alpha Pure will produce 0.24% less power than at 25 degrees. At 29°C (84°F) it will lose less than 1% of its production.
Does solar panel efficiency matter?
All things being equal, it makes sense to choose a solar panel with a higher efficiency than one with a lower rating. But high-efficiency solar panels typically cost more than low-efficiency panels, so the best choice comes down to balancing your financial goals with what your installer provides and other considerations like brand and price.
"That's only part of the equation," Tsiolkos said. "The biggest question for the end user is the economics and how that goes."
Is there a reason to consider efficiency?
"If you have one of those little houses on HGTV," says Tom Beresnia, extension teacher at Pennsylvania State University.
If you're limited by the space available for solar panels, you may want to get as much solar energy from that space as possible, although if your state allows it, a community solar subscription may be a better option financially, Beresniak says. .
What should I consider when choosing a solar panel company?
Since there is no one-size-fits-all solar solution, there is no one-size-fits-all advice for choosing a solar company. The best method is to get quotes from several installers before making a decision. Choose the company that offers the best for your needs, trusts you to get the job done, and answers all your questions.
Before going solar you need to figure out your energy usage and decide if your goal is to replace that energy entirely, save as much money as possible, or achieve something else. From there, it's just a matter of matching your goals with your competitive budget.
The Department of Energy recommends choosing an installer with certification from a reputable third party, such as the North American Energy Certification Board, which maintains an online list of certified installers that you can filter by status and certification.
Installers must assess the condition of the roof, as removing the panels later to replace the roof will be an additional expense. They must be able to transparently answer questions about the system design and why they came up with a particular proposal.
"Installers can make a big difference because angles and mounting are [important] to maximize what you have in that location; a skilled installer will still be the real key to your long-term productivity," Beresniak says.
Frequently Asked Questions
Which type of solar panel is the most effective?
Most solar panels installed today have monocrystalline or polycrystalline cells. Monocrystalline solar panels are more efficient than polycrystalline solar panels, although they are slightly more expensive. All the solar panels listed above use monocrystalline cells.
A third type of solar panel, thin film solar panels, is more efficient than monocrystalline and polycrystalline panels.
Can solar panels be 100% efficient?
The panels in this list are commercially available only Research into solar cells (the energy-generating components that make up solar panels) has led to much greater efficiency in laboratories. The National Laboratory for Renewable Energy monitors the maximum efficiency achieved under standard laboratory conditions. The highest efficiency achieved by solar cells was 47.6%, recorded in June 2022.
