SunPower 2022 Solar Panel Review: Are They Worth It?


SunPower and its solar panels are consistently ranked among the nation’s most popular for their outstanding efficiency, performance and warranty. In this SunPower solar panel review, we’ll discuss how the best solar panels from the industry leader stack up against the best products from the competition.

Would you like to know more about SunPower solar installations? Read our full SunPower review. You can also get a free quote for home solar panels using this tool or the form below.

Panel presentation

With roots in solar technology and manufacturing, SunPower’s solar modules actually predate the company’s success in the installation market. To expand its installation services, SunPower announced in late 2021 that it would transform its manufacturing arm into a new company, Maxeon Solar. SunPower solar panels are always marked with their original namesake.

SunPower offers four monocrystalline solar panels, each with their own unique advantages. Which panel you choose will depend on your needs. Here is an overview of each type of solar panel:

SunPower solar panel



Best for

A series


400 W

Homeowners who want the best product available

X series


370 W

Projects with limited space, such as houses with small roofs

E series


320 W, 327 W or 435 W

Residential projects and small commercial operations

P series


380 to 400 W

Commercial installations or projects without space constraints

SunPower solar panel efficiency

The first solar panel ever invented only had an efficiency rate of around 6%, which means that only 6% of the energy hitting the panel is converted into usable alternating current (AC). Even today, the most efficient solar panels in development only convert about 40% at most.

SunPower’s 19-22% ratings (varying with different models available) are considerably higher than most conventional panels on the market today, offering a variety of benefits. These include:

  • Requiring lower overall cost: Since high efficiency solar panels have better power output, the number of panels you need in your home is reduced, which can lead to lower total costs.
  • Provide more power for usable space: Similarly, high efficiency panels offer more energy potential with less space. This means that homeowners with less available rooftop space may still be good candidates for SunPower solar panels.
  • Be more sustainable overall: High efficiency panels not only offer better value for money, they also help reduce your impact. Fewer panels require less material, reducing the energy and waste that goes into your SunPower system.

Temperature coefficient

Another way to describe the performance of solar panels under varying conditions is the temperature coefficient. Solar panels operate at an ideal temperature of around 75 degrees F, and their performance can degrade with temperatures significantly above or below this figure. The smaller the temperature coefficient, the less performance is affected when temperatures change.

SunPower solar panels currently have a temperature coefficient of between -0.35 and -0.29, one of the best on the market today. If you live in a climate that remains mild all year round, the temperature coefficient will be less of a factor in choosing your solar panel.

SunPower solar panel warranty

Solar panels are known for their durability, but a warranty is always an extremely important consideration in your purchase. Fortunately, product warranties are attached to the purchase of most systems. These are good for at least 10 years and the best hedging performance for up to 25 years.

Most Guarantees of Solar Panel Products blanket what follows:

  • Defective products
  • Defective parts

Most Guarantees of Solar Panel Products do not cover what follows:

  • Underperforming systems resulting from improper installation or products
  • Manufacturing errors like roof leaks
  • Accidents like tree branches falling on your panels or squirrels chewing on wires

SunPower’s 25 Year Full Trust Guarantee offers the following to solve a number of common solar warranties pitfalls:

  • All-in-one product warranty: Systems built with products from different manufacturers can lead to an exchange of customers between companies as they take responsibility for a failed part or system. SunPower’s warranty, however, covers the entire system to ensure your problem is solved in one place.
  • Fees for collection and shipping of defective parts: Conventional warranties generally do not cover the cost of picking up and shipping defective or damaged parts. SunPower’s warranty does not cover any additional costs for replacing panels or other parts.
  • Energy production guarantee: Power Generation Guarantees are performance guarantees that ensure your solar system will operate at at least 90% of its original power generation for 25 years. Conventional solar warranties may not cover replacement parts if your solar system’s degradation rate is higher than expected.

Overall, companies like SunPower and Sunpro are making all-in-one system warranties more common. The results are paying off.

Cost of SunPower solar panels

The cost of solar power is difficult to predict by vendor, as project prices vary a lot depending on your location, utility bills, and energy needs. When you get a quote from SunPower, the price might seem a little higher than average because their business is all about efficiency. But remember, buying more efficient panels will save you more money in the long run.

The best way to fully understand how much SunPower solar energy would cost you is to contact us and get a free quote. Even better would be to get quotes from SunPower and a few other local companies to compare prices. Keep in mind the quality of the panels you are considering, as the cheapest solar panels do not always offer the best value for money.

How to pay for SunPower solar panels

SunPower offers three general solar financing plans, all backed by SunPower’s 25-year warranty:

  1. Cash purchase: The initial purchase of a solar energy system from SunPower will provide the best solar payback period and the best return on investment. If you are able to raise the money, this method is the most profitable.
  2. Buy with a solar loan: SunPower can help you get a loan from one of its partners. With this loan, you can buy the system and pay off the loan. Most loans are repaid in five to twelve years. If you choose to buy a system with a solar loan, you will still be eligible for the solar tax credit and your solar panels will increase the value of your property. However, due to the interest you will be paying on your loan, this option ends up costing a little more than a cash purchase.
  3. Solar lease: SunPower offers solar leases, where you rent solar panels from SunPower. SunPower retains ownership of the panels so you lose the benefits of net metering, solar tax credit, and increasing the value of your property. Solar leases offer a low initial cost option with less return on the backend. While less advantageous than purchasing a system, leases extend the benefits of solar power to homeowners who may have poor credit or who don’t want to deal with the hassle of buying and maintaining them. panels.

Here is a recap of each financing option available for SunPower solar panels:

Cash purchase

Solar loan purchase

Solar Lease

Own solar panels

You own the system

You own the system

SunPower owns the system

Eligible for the tax credit?




Adding to the value of your property?




Money required in advance?




Global SunPower Solar Panel Review

SunPower sets the industry standard for solar panel efficiency, performance and warranty. Customers who own SunPower solar panels rate them well, leaving excellent reviews such as the following:

“Five stars for the [most] efficient modules with the best guarantee. “ – David S. via the Better Business Bureau (BBB)

“We chose SunPower because… their panels produce more than any other company. Our roof is not consumed with panels. We have literally half the quantity of our neighbors. “ – Theresa D. via BBB

The company’s all-in-one system approach simplifies the solar process without sacrificing quality. It’s hard to go wrong with SunPower’s solar panels, but we especially recommend them for homeowners with limited rooftop space.

If you would like to know how much a solar panel system would cost for your home, you can get a free, no-obligation quote using this tool or by filling out the form below.

Frequently Asked Questions

What solar panels does SunPower use?

SunPower uses its own solar panels which are manufactured by Maxeon, the manufacturing arm of the company. SunPower currently offers four types of panels: A Series, X Series, E Series, and P Series. These panels are designed to meet different energy needs.

Is SunPower Solar legit?

SunPower is a legitimate solar company providing residential and commercial installations nationwide. SunPower consistently ranks among the top solar companies in the United States and offers high quality, high efficiency solar panels.

Does NASA use SunPower panels?

NASA initially chose SunPower solar panels to power its unmanned aerial vehicles (or UAVs) while they were in flight. Since 1997, NASA has continued to work with SunPower on rover projects and more. SunPower got its start as an engineering company and manufacturer of solar panels after its founders were inspired by the use of solar energy on spacecraft.

Karsten Neumeister is a writer and renewable energy specialist with a background in writing and the humanities. Prior to joining EcoWatch, Karsten worked in the New Orleans energy sector, focusing on renewable energy policy and technology. A lover of music and the outdoors, Karsten can be found climbing, canoeing or writing songs when he is not at work.


Leave A Reply