Why You Need A 400W Solar Panel?

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“The power generation is too low for the solar panels to be of much use to me.”

“Solar panels are too bulky, take up a lot of space, and are not easy to carry around.”

These are the “stereotypes” that most people have about solar panels.

So is there a solar panel that is portable, has a small footprint, is efficient, and can generate enough power to meet electricity needs?

400W solar panel

The rated power, or wattage, of a solar panel determines the amount of electricity it can generate, and it is the high power solar panels that drive the larger electrical loads and the use of more electrical equipment.

For most applications, a 400W solar panel can achieve the perfect balance of power generation and portability.

Whether used in the home or outdoors, they provide sufficient power without taking up too much space and costing too much to install.

Why do you need a 400W solar panel?

This article will provide you with all the answers, including an introduction to the performance specifications of 400W solar panels, what 400W solar panels can run, recommendations for the best 400W solar panels, and more.

What is a 400W solar panel?


A 400W solar panel is a solar photovoltaic panel with a power output of 400 watts (W). A solar panel is a device that uses the photovoltaic effect to convert solar energy into electrical energy. It consists of several photovoltaic cells, which are semiconductor materials capable of converting sunlight directly into electricity.

The power output of a solar panel depends on a number of factors, including the type of PV cell, the quality of the material, the area and the operating conditions. 400W solar panel means that the panel is capable of delivering 400 Watts of electrical output under standard test conditions.

400 Watt solar panels are generally considered mid-range, capable of delivering enough power to meet the needs of most small electronics and appliances while avoiding the price burden of larger, more expensive industrial-scale solar arrays.

It is important to note that the actual power output of solar panels may be affected by weather conditions, sunlight intensity, temperature, and the angle at which the panels are placed.

400W solar panel

What a 400W solar panel can run?


Determining the compatibility of equipment with a 400-watt solar panel requires considering multiple factors.

Firstly, the power consumption and operating time of the equipment play a crucial role. Different devices have varying power requirements, and their daily usage duration must be taken into account.

For instance, a fan may consume around 40 watts, but if it operates continuously for 24 hours, it would require 960 watt-hours (Wh) of power per day.

On the other hand, a laptop charger with a power requirement of 90 watts, used for 4 hours daily, would only consume 360 watt-hours (Wh) of power per day.

The actual output and losses of the solar panel also need to be considered. While a 400-watt solar panel is rated for 400 watts under standard conditions, real-world factors like weather, location, and seasonal variations can impact its performance.

Additionally, there are losses during power transmission and conversion processes. Therefore, when determining the equipment that can be operated, it is important to consider a slightly reduced output from the solar panel.

Battery capacity and inverter efficiency are other crucial factors. To utilize solar power during periods of no sunlight, batteries are employed to store excess energy, and an inverter is used to convert the stored DC power to AC power. Both these components have associated costs, occupy physical space, and affect the overall efficiency of the system.

400w solar panel

Considering all these factors, one can estimate the available power generated by a 400-watt solar panel per day and calculate the total power required by various devices based on their power consumption and operating hours. Let’s assume the system employs a 12V battery with a capacity of 183Ah, an 80% depth of discharge (DoD), and a 500W inverter with 90% efficiency. Using these values, the following calculations can be made:


A 400W solar panel can generate approximately 1600 watt-hours (Wh) per day, assuming 4 peak sunshine hours.

The available battery capacity is 1766 watt-hours (Wh), calculated as 12V * 183Ah * 80%.

The inverter output power is 450W, calculated as 500W * 90%.

The total system efficiency is 67.5%, calculated as 450W / 1600W * 100%.

Based on the above calculations, we can draw the following conclusions:

A 40W fan operating continuously for 24 hours consumes 960 watt-hours (Wh) of power, accounting for 60% of the total system power.

A laptop charger with a power requirement of 90 watts, used for 4 hours, consumes 360 watt-hours (Wh) of power, representing 22.5% of the total system power.

A 120W TV used for 4 hours consumes 480 watt-hours (Wh) of power, equivalent to 30% of the total system power.

A 15W LED bulb operating continuously for 24 hours consumes 360 watt-hours (Wh) of power, also accounting for 22.5% of the total system power.


The four devices mentioned above can be powered by a 400-watt solar panel either individually or simultaneously, as long as their combined power consumption does not exceed the system’s total output and capacity. It’s worth noting that these examples are not exhaustive, and various other devices with different power requirements and operating hours can be accommodated by a 400-watt solar panel, given proper calculations and matching.

400W solar panel

Best 400 watt solar panel recommendations


As mentioned earlier, is there a solar panel that combines high power, high output, lightness and portability?

This is what I would recommend as the best 400W solar panel:

400W solar panel

400w solar panels

It is a portable and foldable solar panel consisting of four 100W solar panels, two of which are connected by metal hinges and designed with a portable carry handle.

Sungold hi-power 400w portable solar panel is an efficient, foldable solar panel. High power output, can be adapted to the 1-2.5kwh portable solar power station.

400w portable solar panel adopts patented materials, and new technology, and has a 5-year warranty to give you a better experience.

400w portable solar panel is very suitable for high-power application scenarios such as off-grid homes, RVs, commercial vehicles, ships, outdoor camping, and outdoor emergencies.

400w solar panel specifications


Product-specific specification data would be more intuitive, but most 400W solar panels have similar specifications except for some variation in size and dimensions.

For more information on 400 watt solar panels you can click on Sungold.

400 watt solar panel specifications
Maximum power(Pmax) 400W
Open-circuit voltage(Voc) 43.1V
Voltage at Pmax(Vmp) 36.5V
Short-circuit current(Isc) 11.62A
Current at Pmax(Imp) 10.96A
Cells efficiency(%) 0.22
The maximum system voltage 200V DC(IEC)
Power temperature coefficient -0.38%/
Voltage temperature coefficient -0.36%/
Current temperature coefficient 0.07%/
Output power tolerance ±3%
Operating temperature -20~70
Weight 12.6kg
Unfolding size 2362*900*25mm
Warranty  5 years


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