What is 440W 420W Solar Panel For Sale and Why Do We Use Them?

Topcon 440W 420W bifacial solar panels are among the latest high-efficiency products

1. Superior Energy Efficiency: Maximizing Solar Power Output

The core strength of Topcon 440W and 420W bifacial solar panels lies in their exceptional energy conversion efficiency. Thanks to TOPCon technology (Tunnel Oxide Passivated Contact), these panels significantly improve electricity conversion, achieving an efficiency rate of over 22%. This means more energy production per square meter, delivering greater returns for homeowners, businesses, and large-scale solar projects.

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2. Bifacial Power Generation: Capturing Light from Both Sides

One of the standout features of Topcon bifacial solar panels is their ability to generate power from both sides. In addition to capturing direct sunlight on the front, the back of the panel also absorbs reflected light from the ground. This dual-sided design can increase overall energy output by 10% to 30%, especially in areas with high albedo, such as reflective rooftops or sandy surfaces. This makes Topcon 440W 420W bifacial solar panels ideal for projects in high solar radiation regions, where maximizing energy yield is critical.

3. Durability and Weather Resistance: Ensuring Long-term Performance

To withstand challenging outdoor environments, Topcon bifacial solar panels are built with high-strength materials, offering excellent resistance to weathering and aging. Whether in extreme heat, freezing cold, dust storms, or humid conditions, these panels maintain optimal performance. Their long-lasting reliability ensures that projects can generate stable energy over the long term, providing consistent returns on investment and reducing maintenance costs.

4. Versatility in Applications: Flexible Installation Options

The Topcon 440W 420W bifacial solar panels are highly versatile, making them suitable for various applications. Whether for residential rooftop solar systems, commercial building projects, or large-scale ground-mounted solar farms, these panels deliver superior performance. They are lightweight and easy to install, compatible with various mounting systems, and can be customized to meet the specific needs of different projects.

5. Commitment to Sustainability: Supporting Global Carbon Neutral Goals

As the world moves toward carbon neutrality, adopting high-efficiency clean energy solutions has become essential. Topcon bifacial solar panels not only help reduce electricity costs but also significantly lower carbon emissions. With higher energy efficiency and a longer lifespan, Topcon solar panels improve energy utilization, support the transition to renewable energy, and promote environmental protection and sustainable development.

If you’re thinking about installing solar panels on your roof in , it’s more than likely you’ll be buying 400 watt (W) panels. As solar technology advances, the wattage of a typical solar panel has steadily been increasing. Today, most panels you'll find on a residential home are 400 W, which is almost double the wattage of the first solar panels that came on the market. You can think of the wattage of a solar panel as the amount of power it can generate in a certain amount of time under ideal conditions. The higher the wattage, the more power a panel produces.

Although the industry now also produces 500 W solar panels, it’s unlikely you’ll need that much wattage per panel to power your home. The most common uses for 500 W panels are usually commercial buildings or utility-scale projects.

We’ll walk you through what you need to know about both 400 W and 500 W solar panels so you understand the pros and cons of each panel size, and when it makes sense to use either one.

A 400 W solar panel does what it sounds like – one panel produces an output of 400 watts of electricity, which yields approximately between 1.2 and 3 kilowatt hours (kWh) daily. How much electricity your panels actually generate on a day-to-day basis depends on a few key factors such as how much sunlight they get, your geographic location and the angle your panels are tilted at. What season it is also plays a role in how much electricity your panels will generate - in the summer their output will be much higher than the winter because they’re exposed to more hours of sunlight on a daily basis.

On average, a home in the U.S. consumes about 30 kwh every day, or 900 kWh per month. While 400 W panels can be used for commercial projects, you’ll see them most frequently on people’s homes rather than big buildings.

The 500 W solar panel was designed to meet the solar energy output needs of medium and large solar systems using fewer panels, which increases efficiency and lowers costs. Solar panels used to be much smaller than 500 W (just 300 W or less as recently as a few years ago), so they represent a big technological improvement.

There are two ways to increase the power of an individual panel:

1. You can make it bigger (i.e., go from a 60-cell module to a 72-cell module that takes up more space).

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2. You can increase the overall efficiency of the solar panel (how well it captures sunlight) by improving the manufacturing process of its silicon cells, the solar panel itself, or both.

Many 500 W panels are manufactured using half-cut solar technology, which leads to high efficiency and durability with a half-cell. As are most solar panels today, 500 W panels are always monocrystalline, which is a more efficient material than polycrystalline.

Although they aren't necessarily practical for homeowners, the creation of 500 W solar panels was a significant milestone in the solar industry because that level of panel efficiency and power output from a single solar panel was unheard of even five years ago.

500 W panels are still relatively rare in residential installations. Two of the main differences between a 400 W and 500 W panel are that 500 W panels are designed primarily for larger scale installations, meaning they're physically bigger than typical residential panels. 500 W panels are also bifacial, which means they can collect sunlight from both the front and back of the panels, increasing the overall amount of electricity produced. Bifacial panels are less frequently installed in residential applications.

Both 400 W and 500 W solar panels provide significant savings, especially when paired with a solar inverter, charge controller, solar battery, or other type of energy storage.

For example, a 20-panel installation of 500 W solar panels (10 kW system) will produce enough electricity to offset about a $200 monthly electricity bill, depending on where in the country you live. On the other hand, a 20-panel installation of 400 W panels (8 kW system) can offset a $160 monthly electricity bill.

Something to keep in mind when you install solar panels is your future energy use. If you're thinking about buying an electric vehicle or installing a heat pump, then you may want to increase the number of panels you put on your roof even if the amount of energy they'll produce exceeds your existing needs. However, some utility companies won’t always allow you to install a system that generates more power than you currently need, so it's important to confirm whether or not yours will allow you to do so.

The number of solar panels you need to install depends on how much electricity you want to generate and how much roof space you have available to mount solar panels. The table below compares different-sized solar panel systems using the number of 400 W solar panels that are needed for each system size. The number of 400 W panels is rounded to the nearest panel.

To calculate how many solar panels you need, simply divide your annual electricity usage by your production ratio and then divide that number by the wattage of your solar panels. Let's use an example: the average U.S. household uses about 10,800 kWh of electricity every year, according to the U.S. Energy Information Administration (EIA). If we assume an average production ratio of 1.4, here's how to do the math:

System size/production ratio/panel wattage= number of panels

10,800 kWh / 1.4 / 400 W= 19 panels

If you're considering going solar, you can get multiple quotes from pre-screened installers by signing up on theEnergySage Solar Marketplace. If you already know what kind of solar equipment you want, you can note your preferences on your account so installers can give you quotes for those specific products or brands. If you're simply looking for a quick estimate for how much money solar can save you, try ourSolar Calculator.