Solar reviews

GreenWatts solar panels review 2024: Brazilian present - A1 SolarStore

That’s a bit of a surprise to review solar panels made in South America, but here they are – GreenWatts from Brazil. What makes these panels stand out from the crowd and are they worth buying? Let’s explore in our GreenWatts solar panels review 2024.

GreenWatts: Seems we’ve already seen this…

Headquartered in San Diego, US

Production facility in Santa Catarina, Brazil
Materials sourced from South Korea, Malaysia, Turkey, Brazil and Germany


Headquartered in sunny San Diego, GreenWatts provides solar panels for homeowners, businesses, and utility providers. The production facility is located in Santa Catarina, Brazil, and materials are sourced from South Korea, Malaysia, Turkey, Brazil and Germany. 

GreenWatts doesn’t just stop at panels – they offer complete solar kits, including inverters, racking systems, energy storage solutions, and EV charging stations. This comprehensive approach positions them as a one-stop shop for solar energy needs – all you need to build your solar system can be sourced from a single supplier.

One particularly intriguing thing about GreenWatts is their partnership with HT-SAAE, a Bloomberg Tier 1 solar manufacturer from China. HT-SAAE was founded in 1960 to develop solar technology for China’s satellite program and now is renowned for producing some of the most powerful and dependable solar panels on the market. Learn more about them in our HT-SAAE solar panels review.

GreenWatts solar panels: Powerful and efficient

410W – 660W – power output

GreenWatts offers a variety of solar panels with different power outputs. Their range starts at 410 watts and goes up to 660 watts. You can choose panels that are suitable for both small residential installations and larger commercial projects. Whether you have a limited roof space or require a substantial amount of power, GreenWatts has a panel option for you.

21% – 23% – efficiency

GreenWatts solar panels demonstrate impressive efficiency ratings, ranging from 21% to 23%. Such high efficiency makes GreenWatts panels a helpful choice for limited roof space or lower sunlight areas.

25-30 years – performance warranty

For whatever reason, the product warranty on GreenWatts panels is not mentioned on either the website or the specs. That’s not very nice, as it makes you wonder if it equals the performance warranty which is 25-30 years, and that’s fantastic, or if it’s just standard 12-15 years, which is not so great.

Speaking of the price, GreenWatts solar panels fall in the medium-range pricing category. While they may not be the cheapest panels on the market, they offer great value for their cost.

GreenWatts solar panels: Pros

Now that we’ve discussed the technical details, let’s sum up the bright sides of GreenWatts solar panels.

  • Abundant selection: GreenWatts offers a wide spectrum of solar panels, from 410 watts to 660 watts. With this versatility, you can choose the right panel for any project from residential installation to a solar farm.
  • Good efficiency: Efficiency ratings between 21% and 23% are another stand-out feature of GreenWatts panels, making them particularly beneficial for limited roof space or lower sunlight areas.
  • One-stop-shop solutions: GreenWatts provides complete solar kits, including panels, inverters, racking, storage, and EV charging solutions. This simplifies the purchase process and offers more convenience to customers.

GreenWatts solar panels: Cons

Despite all these benefits, GreenWatts solar panels are not without their challenges.

  • Limited brand recognition: Compared to some of the more established solar panel manufacturers, GreenWatts may have a lower brand recognition. This could affect customer confidence and perception.

Overview of 3 GreenWatts solar panels: Take any

Time to focus on the star of the show: GreenWatts solar panels. What makes them unique?

GreenWatts HS54-415-MN – Good start

The GreenWatts HS54-415-MN is an entry-level model designed primarily for residential systems, offering a power output of 415 watts and an efficiency of 21.3%. It comes with a standard 25-year performance warranty, ensuring the panel retains 85% of its original power output over its lifespan. This model is ideal for homeowners looking to go solar and keep initial costs low.

GreenWatts HS72-590-MN(N) – Most efficient one

The GreenWatts HS72-590-MN(N) stands out as the most efficient option in the lineup, boasting a power output of 590 watts and an impressive efficiency rating of 22.8%. This panel is backed by a 30-year performance warranty, which guarantees 87% of its original power output. Its high efficiency and power output position it as an excellent option for larger-scale installations.

GreenWatts HS66-F-665-MN – Most powerful one

The GreenWatts HS66-F-665-MN is the powerhouse of the GreenWatts lineup, delivering 665 watts of power with an efficiency of 21.4%. It features a 30-year performance warranty that ensures to maintain 85% of the panel’s initial power output. This panel is designed for those who need substantial energy production, such as industrial facilities or large solar farms or any other demanding solar applications.

A1 SolarStore recommends GreenWatts 450W HS60-450-BOB

GreenWatts 450W Solar Panel 120 Cell HS60-450-BOB

The GreenWatts HS60-450-BOB is tailored for home installations, offering a balanced power output of 450 watts and an efficiency of 20.8%. It comes with a 25-year performance warranty, ensuring that users can rely on over 83% of the original power output throughout its lifespan. This model is just perfect for homeowners – powerful, efficient, and durable.

A1 SolarStore verdict: Take it

To wrap up our GreenWatts solar panels review, let’s list the main takeaways.

  • GreenWatts is a Brazilian solar panel manufacturer headquartered in San Diego, US. 
  • GreenWatts offer a complete solar kit, including inverters, racking systems, energy storage solutions, and EV charging stations. 
  • GreenWatts is partnered with HT-SAAE, a Bloomberg Tier 1 solar manufacturer from China. 
  • GreenWatts solar panel’s power output ranges from 410W to 660 watts, while their efficiency floats from 21% to 23%.
  • GreenWatts solar panels are backed up with a 25-30-year performance warranty.
  • Their price tag falls within the medium segment of the market.

GreenWatts panels are all at once – powerful, efficient, and competitively priced. With options for residential, commercial, and large-scale applications, GreenWatts panels can be a great choice for any project. Only when buying, do ask about the product warranty, just to be sure. With that, we end our GreenWatts solar panels review. Subscribe to our newsletter at the bottom of the page to get fresh brand reviews and learn about the latest arrivals!

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Years of experience in translation and a love of nature help Julia find the right words to encourage going solar. She joined the team in 2023 and is happy to make her contribution to a greener future.

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