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300W Monocrystalline solar panel, PV module with cheap price and long time warranty.


Product field:

1. Gird-connected power generation system
2. Off-grid power generation system
3. Building-integrated power generation facilities




Solar Energy:

The sun is a huge energy source. It emits about 3.8 × 10 MW of energy per second into space in the form of light radiation. One in 2.2 billion is projected to Earth. After sunlight is reflected and absorbed by the atmosphere, There are still 70 % transmission to the ground. Despite this, the solar energy received on Earth in one year is still as high as 1.8 × 10kW · H.


Since the formation of life on the earth, it has mainly survived by the heat and light provided by the sun. Since ancient times, humans have also learned to dry objects in the sun and as a way to preserve food, such as salt and salted fish. However, with the reduction of fossil fuels, it is intended to further develop solar energy. The use of solar energy includes passive use (photothermal conversion) and photoelectric conversion.


Solar power is an emerging source of renewable energy. In a broad sense, solar energy is a source of many energy on Earth, such as wind energy, chemical energy, potential energy of water, and so on.

Product picture

300W Monocrystalline solar panel, PV module with cheap price and long time warranty.


300W Monocrystalline solar panel, PV module with cheap price and long time warranty.

●  Solar Panel Parameters:KL-300W-M

●  Optimized working voltage:36.00V

●  Optimized working current:8.333A

●  Open circuit voltage:43.2V

●  Short circuit current:6.945A

●  Nominal power:300W

●  Operating temperature:-40℃ to+85℃

●  Maximum system voltage:1000VDC(IEC)/600VDC(UL)

●  Series fuse rated value:20A

●  Power tolerance:±3%

●  Notic:Data under standard testing condition (STC):1000W/㎡,AM1.5,25℃.

● Cell specification:156×156mm

● Arrangement quantity:72(6×12)

● Solar panel dimension:1950×990×45mm

● Weight:20.0kg

● Glass specification:3.2mm(0.13inch) tempered glass

● Frame:Anodised aluminium alloy

● Rated operating temperature:45±2℃

● Pmax temperature parameter:-(0.48±0.05)%/℃

● Voc temperature coefficient::-(0.34±0.1)%/℃

● Isc temperature coefficient:0.04±0.01%/℃



PV power generation is based on the principle of photovolt effect, using solar cells to directly convert sunlight into electricity. Whether it is used independently or connected to the grid, the photovoltaic power generation system mainly consists of three parts: solar panels(components), controllers, and inverters. They are mainly composed of electronic components but do not involve mechanical components.

Therefore, the photovoltaic power generation equipment is extremely refined, reliable and stable life is long, and the installation and maintenance is simple. In theory, photovoltaic power generation technology can be used in any situation that requires power supply, from spacecraft to domestic power sources, from large to megawatt power stations, to toys, and photovoltaic power sources can be ubiquitous.

Mono Solar Panel

◪  Anti-reflective coating: AR used reduce the reflectivity enhance transmittance.

◪ Tempered Glass: Low Iron and AR coating glass increase the power output and mechanical strength of solar module. Mechanical load ≥2400Pa , transmittance ≥91.6%

◪  EVA: Transmittance ≥91% , Adhesive Capacity >85%

◪  Cell: 17.9% of high efficiency solar cells to sure 15.7% module efficiency

◪  Back sheet: Using higher quality back sheet to prevent destroying and water , it’s reflectivity ≥87%, peeling strength ≥ 40N/cm.

◪  Aluminum Frame: Anodized aluminum alloy to effectively improve the corrosion resistance and strength.




10 year at 90% power output
25 years at 80% power output


LONGSUN SOLAR ( old Kelan Solar ), established in 2008, is a professional green power producer of solar panel and solar module in Ningbo, China. Our main products are 2 -350 watt mono crystalline and poly crystalline silicon solar panels in standard or special sizes and shapes. We also design solar street light system and solar power systems for homes and industrial use.


High quality raw materials, strict control system, advanced technology and testing equipment ensure each piece of solar panel from LONGSUN SOLAR with extremely supper efficiency and long usage time of 25 years. Until now,our solar panels and systems were exported to the overseas market, like Southeast Asia countries, Middle east countries, South America countries and  Africa.


Choose us means you get a reliable partner with mutual development and mutual benefits.

Best materials

300W Monocrystalline solar panel, PV module with cheap price and long time warranty.

1. Glass:

> High-transmittance low-iron tempered glass

> Antireflective glass
> Translucency of normal luminance is increased by 2%
> Module efficiency is increased by 2%
> Self-cleaning function
> Service life is as long as 25 years (30 years optional)

3. Frame

> Anodized quality aluminum frame, beautiful appearance

> Conventional frame
> Silver or black frames are optional
> Boost bearing capability and prolong service life

> Serrated-clip design tensile strength

> Seal-lip designglue injection

2.Anti-aging EVA

> Excellent weathering resistance TPT

4.Solar Cell

> High Efficiency PV Cells
> Appearance Consistency
> Color sorting ensure consistent appearance on each module
> Anti-PID

5.Junction box

> Conventional standalone edition and engineering custom edition
> Quality diode ensures module running safety
> IP67 protection level
> Heat dissipation
> Long service life

★ Important:Wind resistance, pressure resistance, high conversion efficiency.


On-grid power system.

Off-grid power system.

Solar power station.

EPC projects.


Single carton packing. Pallets packing. Wood cases packing.

Corner ProtectionInside CartoCarton sidePallets Package
Container Loading


Factory Direct Price

NICE Quality

Offer free samples before order confirmed.

No MOQ, Small Order Welcome

Customized Design

Suppport OEM for all orders

Support REFUND Money if the quality is not satisfactory

PAYMENT Support T/T, L/C, Credit Card, E-checking, Western Union

Tag:polycrystalline silicon solar panels, mono solar cells panel; lightweight solar panels.

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