Panasonic solar panels review 2024: Old and gold

Panasonic electronics are famous all around the world. Most of us probably have something at home from Japanese engineers: a TV, a microwave, a washing machine… But what about solar panels? Panasonic makes them as well. Well, are they any good? Let’s see! In this article we’ll take a look at the product of one the oldest brands in the industry: here’s a Panasonic solar panels review for you.

Panasonic focuses on designing solar systems

Panasonic stopped solar panels production in 2022. Apparently, the Japanese company could not keep up with the Chinese competitors and the prices that were able to offer. Some assumed that the company was going to leave the solar market completely. Later the managers made an official announcement: Panasonic will focus on designing solar systems and equipment for them and outsource PV modules production.

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Not just China: Where solar panels are made

Allegedly, Panasonic solar panels are made in Singapore nowadays and they are manufactured at the same facility as REC solar panels. The PV modules of these two brands are very similar and the claim looks at least plausible. However, we don’t have an official confirmation of it.

HIT technology makes Panasonic panels stand out

One of the most famous features of Panasonic modules is Heterojunction with Intrinsic Thin (HIT®) layer technology, patented in 1997. It is an improvement on the classic design of a cell with ultra-thin layers of silicon between the wafer and the glass. It reduces the energy losses at the boundaries of a cell which substantially improves the performance of a panel at high temperatures.

The temperature coefficient of Panasonic HIT panels, which stands for how much energy a panel loses on hot days, is only at -0.258%/°C, when with most panels it varies between -0.3%/°C and -0.5%/°C. For example, a panel with a temperature coefficient of -0.4%/°C is going to lose around 40W of output on a sunny summer day somewhere in Phoenix. Panasonic HIT module in this case loses only around 25W.

HIT technology, however, doesn’t give Panasonic panels the highest efficiency overall. On average conversion rates of Panasonic panels range from 19% to 21%: good, but these are not the top numbers on the market.

Panasonic panels are also quite durable and resistant, thanks to the 40mm aluminium frame. Most of them can withstand 5400 Pa pressure which is comparable to 210 mph wind. Such a module is capable of surviving a tornado. A special drainage system reduces the stains from melted snow and rain.

When it comes to the cost, Panasonic panels can be quite expensive: around $1-$1.2 per watt. Japanese electronics are often costly in general, because of how modern and high-quality they are. Besides, Panasonic is a famous brand and that makes up a big part of the price. They are not the most expensive, but they would probably make the Top-5 list along with REC and Sunpower.

Panasonic offers a 25 year both product and performance warranty for all of its panels. The modules show amazingly low degradation rates: they lose only 0.26% of power per year while most conventional panels lose 0.7%-0.8%. Panasonic panels end up with more than 90% of their initial power output after 25 years. These are among the best numbers in the industry in that regard.

Panasonic has offices and representatives all around the world everywhere so getting customer’s support is easy. Most likely you’ll never need it, since the failure rate of Panasonic panels is very low. For example, among 4 million modules supplied in Europe, only 170-180 panels were malfunctioning.

Panasonic solar panels: Pros

So what’s especially good about Panasonic? Let’s consider all the advantages of the Japanese brand.

• High quality. After 50 years in business, the Japanese company has built a solid reputation behind themselves. You are guaranteed to get a quality product with great 25/25 years warranties for product and performance. Degradation rates are exceptionally low – after 25 years you still have more than 90% of initial power output.
• Unparallel at high temperatures. HIT technology allows Panasonic panels to have the temperature coefficient of -0.258%/°C, which is one of the lowest in the industry. If you live in Arizona or Texas, Panasonic panels are always a safe choice.
• Better shading tolerance. Some Panasonic models come with 4 bypass diodes in construction whereas most competitors only offer 2 or 3. Additional bypass diodes make Panasonic panels much less vulnerable to shading.
• Great design. Panasonic Black Series show that Japanese engineers put a lot of thought into the appearance of a panel.
• Easy-to-install AC modules. You can find panels with pre-installed microinverters in the Panasonic product line – something that not every manufacturer offers. However, there are no polycrystalline and thin-film panels for sale. 

Panasonic solar panels: Cons

Disadvantages are not as easy to find as advantages, but they must be listed to make our review unbiased.

• Average efficiency. While Panasonic panels are modern, their efficiency is not super high, considering the cost. You can find panels with a higher energy conversion rate for a smaller price.
• High price of panels. Panasonic panels can cost around $1-$1.2 per watt. These are not the most expensive PV modules on the market – LG and REC occupy the top – but still they are up there.
• Panasonic announced that will outsource solar panels production. The new manufacturer will have to follow the company’s quality standards, but potentially this decision may cause a slight drop in quality.

Panasonic solar panels overview: Premium-class residential modules

Let’s pass on to the actual product that Panasonic puts out on the solar market. We have asked our engineer to take a look at three models and highlight their features. Here is what he thinks.

Panasonic 370W EverVolt Black Series — Beautiful power

Panasonic 370W solar panel called Evervolt is suitable both for commercial and residential installations with 370W of power output. It’s part of a Black Series – notice the amazing design of this model. It shows a superb efficiency of 21.2%. This particular model has three bypass diodes. With 0.25% of annual power loss you end up with at least 92% of the rated power output in year 25. Half-cut cells paired with HIT technology reduce power losses and keep the output high even when it’s hot. The model comes with a 25 year warranty for performance, product, parts and labor.

You can also find the Panasonic 360W solar panel at A1 SolarStore which is a variation of the same model. It’s only slightly less powerful but it's the same Evervolt model which is one of Panasonic’s bestsellers. Another option would be the Panasonic 350 watt solar panel, and you can order it straight away if it’s available.

Panasonic 340W HIT — Don’t fear the heat

Panasonic 96 cell HIT panel is a good choice both for commercial and residential use for a competitive price. It comes with 4 bypass diodes to ensure a great shading tolerance. The model displays 20.3% efficiency. HIT technology ensures the best performance at high temperatures. The design may look pretty generic, but otherwise it’s a great panel to use in a hot area.

Panasonic 330W AC Module With Enphase IQ7X — No inverter needed

AC panels aren’t that widespread on the solar market and who, if not Panasonic, would be selling them? Panasonic 330W 96 cell panel with preinstalled Enphase microinverters are special in a way that they produce AC current on the spot. It means that you don't need an inverter in your system — just plug your panels directly into the electric panel of your house. Microinverters are durable and efficient, and last for the similar time that solar panels do. Four bypass diodes substantially reduce the losses caused by shading of a panel.

That’s a great choice for a residential grid-tie system that guarantees a very easy installation. However, pairing these modules with a battery bank is tricky, since most batteries need DC. You can find AC batteries on the market though. Obviously, the panel is more expensive than most, since you are paying for a microinverter as well.

Panasonic solar panels are designed for residential use

After looking at these examples, it would be safe to say that Panasonic panels are aimed at residential customers. There aren’t any super-powerful 400+W modules in the product line of Japanese company, that are so popular in commercial solar. Besides, the price per watt probably makes it hard to go for a large-scope installation with Panasonic.

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Looking for “the One”: How to check the quality of a solar panel

When choosing a Panasonic panel, pay attention to efficiency: the higher it is, the better. Notice the number of bypass diodes. A shaded cell decreases the output of a panel by 33% with three diodes and only by 25% when there are four of them. HIT technology makes every Panasonic panel excel at high temperatures so there is no need to worry about that. Of course, pay attention to the design of a panel – you want a great look, don’t you? Finally, beware of counterfeit products: Panasonic is one of the most respected brands in the industry, so some may try to sell you their fakes as a Japanese product.

A1 SolarStore recommends Panasonic 400W Solar Panel 132 cell PNS-400-EVP132GL

Out of stock

Panasonic 400W Solar Panel 132 cell PNS-400-EVP132GL

• Price per Watt$1.01
• Rated Power Output 400 W
• Voltage (VOC)48.8V
• Number of cells132
• Cell TypeMonocrystalline

Delivery on Jan 07–10

The Panasonic EVP132GL PV module is designed for both residential and commercial applications. The EverVolt series by Panasonic uses heterojunction technology (HJT), which outperforms traditional PERC cells by merging the benefits of crystalline and thin-film silicon.

Half-cut cell technology increases shading tolerance. Panasonic has designed the solar cells in the EVP132GL to be half the standard size, reducing power loss and improving performance in low-light conditions. This results in a high efficiency of 21.6%. Additionally, Panasonic offers a 25-year product warranty, guaranteeing that the module will maintain at least 92% of its performance after 25 years.

A1 SolarStore verdict: Absolute classic

To round up our Panasonic solar panels complete review, let’s list the most important points about the brand and their product:

• Panasonic is a highly respected brand with a 100-year history and 50 years of experience on the solar market.
• Their product is always top quality and is backed up with a 25/25-year warranty. The failure rate of Panasonic panels is impressively low.
• Their panels are most famous for Heterojunction with Intrinsic Thin (HIT) layer technology, which gives them the best efficiency at high temperatures.
• Overall, the efficiency of their panels ranges from 19% to 21% – good, but not the best.
• Panasonic panels are designed mostly for residential use – basically, there are no 400+W modules in their product line.
• Several models in Panasonic's product line have 4 bypass diodes which makes them exceptionally good at dealing with shading.
• The 40mm aluminium frame makes panels very durable and capable of withstanding 5400 Pa pressure.
• Panasonic Black Series shows that the company truly cares about the appearance of their panels.
• Panasonic panels are on the more expensive side of the solar market.

Overall, we would say that Panasonic panels are great. It’s always a quality product and a safe and reasonable choice for a hot area where HIT technology truly gets a chance to shine. With that, we end our Panasonic solar panels 2024 review. Stay tuned for more of these!

Article updated in summer 2024

Compare Panasonic to other popular brands:

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☀️ Panasonic solar panels vs LONGi
☀️ Panasonic solar panels vs Mission Solar
☀️ LG vs Panasonic solar panels comparison: Asian giants
☀️ REC vs Panasonic solar panels
☀️ Canadian Solar panels vs Panasonic panels

Illustrations – Marina Fionova

Andrey Gorichenski

Senior Editor

Andrey had been a news editor and freelance writer for a number of medias before joining A1SolarStore team. Climate change and its impact on people's lives has always been among his interests and it partially explains his degree in Philosophy and Ethics.

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