20W Direct Factory Sale Price 260-300Watt Solar Panels

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China main port
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Min Order Qty:
10000 watt
Supply Capability:
100000 watt/month

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Item specifice:

Material: Polycrystalline Silicon Max. Power(W): 300 Number of Cells(pieces): 1

Product Description:

20W Direct Factory Sale Price 260-300Watt Solar Panels

20W Direct Factory Sale Price 260-300Watt Solar Panels

20W Direct Factory Sale Price 260-300Watt Solar Panels

Solar Module Introduction

Solar modules use light energy (photons) from the sun to generate electricity through the photovoltaic effect. The majority of modules use wafer-based crystalline silicon cells or thin-film cells based on cadmium telluride or silicon. The structural (load carrying) member of a module can either be the top layer or the back layer. Cells must also be protected from mechanical damage and moisture. Most solar modules are rigid, but semi-flexible ones are available, based on thin-film cells. These early solar modules were first used in space in 1958.

Electrical connections are made in series to achieve a desired output voltage and/or in parallel to provide a desired current capability. The conducting wires that take the current off the modules may contain silver, copper or other non-magnetic conductive transition metals. The cells must be connected electrically to one another and to the rest of the system. Externally, popular terrestrial usage photovoltaic modules use MC3 (older) or MC4 connectors to facilitate easy weatherproof connections to the rest of the system.




Model Type

Peak Power-Pmax(W)


Open Circuit Voltage-Voc(V)


Maximum Power Voltage-Vmp(V)


Short Circuit Current-Isc(A)


Maximum Power  Current-Imp(A) 


Maximum System Voltage

1000V DC

Maximum Series Fuse Rating


Power Tolerance


Temperature Coefficients of Pmax


Temperature Coefficients of Voc


Temperature Coefficients of Isc


Nominal Operating Cell Temperature


Standard Testing Condition(STC)


Qualification Test Parameters

Operating Temperature


Storage Temperature


Pressure Bearing


Wind Bearing


Mechanical Characteristics

Cell Size

Mono 125*125mm±0.5

No.of Cells







3.2mm High Transmission,Low Iron


Anodized Aluminum Alloy

Junction Box


Internal Diodes

3 Bypass Diodes


1*4.0mm² Length 900mm


Packing & Shipping:


We have rich experience on how to pack the panels to make sure the safety on shipment when it arrives at the destination.

The normal size is packed by 25pcs/ carton / pallet. Paper carton for FCL shipping and wood carton for LCL shipping.



1.High reliability with guaranteed -3% to +5% power output tolerance, ensuring return on investment
2.High conversion efficiency based on leading innovative photovoltaic technologies
3.Withstands high wind-pressure and snow load, and extreme temperature variations
4.Attractive appearanceUnique frame design, high mechanical strength, and easy Installation


For c-Si panel: 25years output warranty for no less than 80% of performance, 10 years output warranty for no less than  90% of performance. Free from material and workmanship defects within 5 years.

For a-Si panel: 20 years output warranty for no less than 80% of performance, 10 years output warranty for no less than 90% of performance. Free from material and workmanship defects within 2 years.


•100% product quality protection

•100% on-time shipment protection

•100% payment protection for your covered amount


1What price for each watt?

It depends on the quantity, delivery date and payment terms.

2What is your size for each module? Can you tell me the Parameter of your module?

We have different series of panels in different output, both c-Si and a-Si. Please take the specification sheet for your reference.

3Can you provide the peripheral products of the solar panels, such as the battery, controller, and inverter? If so, can you tell me how do they match each other?

Actually we are only manufacturer of solar panels, but we could try to source them for you in China if you need. We could provide you an optimal system design to instruct you how to install.

4Do you have the CE, TUV, UL Certification?

We’ve already passed all the tests, and any certificate is available.

5Have you ever sold your products to companies in my country?

Of course, we have customers in all general PV markets, but I think we should expand our market share along with the market growth.

6When did your company set up?  You are a new company, how can I believe your quality?

We entered into Solar PV industry in 2005, now we have several plants in manufacturing of a-Si and c-Si panels, and our capacity is 220MW per year. Till now we have already passed all the tests by authorized laboratories, e.g. TUV, VDE, UL.

7Can you help us install the module if we cooperate with you?

We haven’t entered into installation sector, but we have the plan in near future.

8) How do you pack your products?

We have rich experience on how to pack the panels to make sure the safety on shipment when it arrives at the destination.

 (9) Can you do OEM for us?

Yes, we can.

10Can we visit your factory?

Surely, I will arrange the trip basing on your business schedule.

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Q:What Size Solar Panel Would I Need?
It sounds like saving money is your chief goal. If your house is not already super-insulated, that should be the first target. Super-insulation, radiant barriers, double-pane windows, white roof, weatherstripping, attic fan. Number two would be conservation. Can you turn the A/C up to 80? I visited a place in Wyoming when it was 0 outside, and 80 felt very pleasant. Third, efficiency. Have you considered a ground-sourced heat pump? Deep down below your house the water table may be colder than 40 degrees F, and can provide good cooling. After all that, you can look into solar electric, which may or may not be a good deal in your area. The type of solar electric that is most cost efficient is the kind that connects right to the house wiring and works alongside the normal electric company. You can talk with a local installer and get a free financial analysis. Then you can look at it and see if the installer is on the level, or trying to play accounting tricks with unreasonable assumptions. Solar makes sense in most parts of California, but Illinois is not known as a big solar area. The kits you have have seen were probably for standalone solar, generally an expensive proposition for the amount of power you get. Put another way, either it will be low power, or it will be very expensive.
Q:Cost of Solar Panels for basement?
Only after you give an estimate of the power consumption you will have in the basement. Obviously you do not have a clue about solar panels or their usage. Suggest you find a book and start reading.
Q:45 Watt Solar Panel -?
Lets say, for a simple approximation, that the 45 watt panel produces 45 watts /3 of the time and nothing the rest of the time. Each day, this will produce 8 hours times 45 watts = 360 watt hours. Also assume the battery charge controller and inverter waste half of that power, leaving 80 watt hours per day. If you use compact fluorescent lamps, that would allow you to burn 80 watts worth for an hour every day, or 90 watts for 2 hours, etc. That is a lot of light for a shed. You might consider using much less efficient tungsten filament lamps, but eliminate the inverter and choose low voltage (automotive) lamps that can run directly across the battery and lower the total cost, but give you only about half the light times time. The main advantage of the inverter might be that it would allow you to use small power tools or appliances in the shed. -- Regards, John Popelish
Q:What is the real cost of Solar Panels?
The cost of solar is measured in dollars per watt. That means the cost of a cell that can make one watt continuously in full sunlight. A friend of mine is starting a new job to set up a new solar cell factory and he said the present cost is $3 per watt, but that they expect to get that down to $ per watt in a few years. They can be damaged by weather, just like any regular roof. My insurance agent asked if I had solar panels, so it is a factor in insurance cost. I never heard of recycling or disposing of old panels, maybe because they are so new and last so long that not many are ready to be disposed of yet.
Q:Questions about the okorder.com solar panels?
Are there any extra unseen costs? (tools, energy converter, ect). Yes. Batteries or Inter-tie, charge controllers, inspections, wiring, inverter etc. 9. How much is it to get an electrician to hook you to the grid? Call for a quote. 0. Is it better to hook to batteries or the grid? Pros, cons, why? Batteries are expensive and only last several years. Maximum power is limited by the size of the inverter. Grid-tie eliminates the need for batteries but then you have to purchase a very expensive grid-tie inverter.
Q:having problems with my homemade solar panel....?
You description is not clear as to what is supplying and what is consuming the .2, 8, and 5. volts you mention. I get that your solar panel output is .2 VDC (volts DC), but is that open circuit or under load? Also, is the charger output AC or DC? What's using 8 volts? Circuits don't selectively use a portion of the voltage supplied. They use all or nothing. Is the polarity correct from your solar panel to your MP3 player? If your MP3 player requires DC for charging and you're feeding it the correct polarity, but too high a voltage, an overvoltage protection circuit in your MP3 charging circuit might be blocking the charging current from your solar panel. Go through everything again and if you need to post another question on YA, be specific as to what you're measuring, where, and whether it's the source or load you're measuring.
Q:Is it truE thet solar panels. . ?
It is a system, you can get a small scale panel that can do things like charge cel phones and ipods. The type of system I have installed on my home needs a converter that turns the dc current that is produced by the panels into ac current to run in my home. I don't have a battery system because I'm not off the grid. When I'm generating more electricity than I am using I sell it back to my utility and at night when I'm not gernerating any electricity I buy it back again. Basically my meter runs backwards durning the day and frontwards during the night.
Q:How much do solar panels cost?
Go with Stephen's answer. It typically costs $20-40K for powering a home so I would go with $00K's. If that was a plan for your school, look into wind power. Your school would most likely have to place it outside of town but its all the same in the end.
Q:I would like some info on Solar panels and Wind Generators...please?
The best sort of solar panel for $ to energy is the hot water type that use a vacuum tube system to heat your water. This saves you money on heating water and is relatively cheap to install compared to other things like wind or PV solar. I'm not too sure about where you live (I'm in the westcountry of the UK where wind energy IS viable... but usually it isn't). The best sort of Photo voltaic solar panel (that makes electricity)is still expensive yet very reliable as they only need photons to fall on them not neccessarily full sunshine and they are improving all the time. It depends on the pitch of your roof as to whether snow settles on them. One can have a system that sells power back to the national grid and then you buy what you need with a discount for what you produce. Obviously if you can afford enough panels one could even make a profit. Or you can go self-sufficient, but then you need batteries and an inverter to convert your 2 volt battery output back to 20 volts or whatever you use (it's 240 volts in the UK). Then it's a matter of how efficient your batteries are in amp hours. Dry mainainence free deep cycle batteries are best for this job and quite expensive still. Wind generators are only really practical if you can mount them high enough from the ground to where there is more constant wind. As I said that depends where you live and the prevailing winds. The very small ones are basically useless except for emergency lighting or something, so one needs a fairly large turbine to produce enough power for a modern home so planning restrictions should be considered when going down this road. For now, solar power is definitely the way to go, even as far North on this planet as Canada and the UK. Good luck. Once you have the system it's basically FREE energy!
Q:How can I build my own solar panel for electricity?
Build okorder.com/

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