Solar Panel Kit

Ref Price:
Loading Port:
China Main Port
Payment Terms:
TT or LC
Min Order Qty:
50 Pieces pc
Supply Capability:
2000000 Watts Per Year pc/month

OKorder Service Pledge

Quality Product

Order On-line Tracking

Timely Delivery

OKorder Service Pledge

Credit Rating

Credit Services

Credit Purchasing

Share to:

Product Description:



250W Poly Solar Panel( SGP-250W)

5-25 yrs Warranty

A grade polycrystalline cell

PV TUV certification

Best quality solar

hot sale solar panel 250w for home solar system/solar energy product



1.high conversion efficiency

2.sealed with high transparency low-iron tempered glass, anti-aging EVA, high insulation TPT.

3.withstand high wind pressure and snow load.

4.with IEC61215/61730, TUV, CE, ISO



1) 5 years for material & workmanship;

2) 12 years for 90% power output;

3) 25 years for 80% power output.


Packaging & Delivery

MOQ: 50pcs

Delivery Time: 10-20 days after order confirmation

Package: Wooden carton or pallet packing


poly solar module

Electrical Characteristics
Maximum power (Wp) 230Wp240Wp250Wp
Maximum power voltage (V) 30.0030.0030.00
Maximum power current (A)7.007.347.66
Open circuit voltage (V) 36.0036.0036.00
Short circuit current (A) 7.567.928.28
Cell Efficiency (%) 15.00%15.50%16.00%
FF (%) ≥74%
Maximum system voltage (V) 1000V
Temperature Range`-40 to +85
Power tolerance (%)±3%
Standard Test Conditions1000W/m2 , AM1.5 , 25C
Mechanical Characteristics
Solar cellPoly Poly Poly
Number of cells (Pcs)60(6*10)
Size of module (mm) 992*1964*45mm
Weight per piece (kg)19
Front Glass3.2 mm tempered glass
Surface Maximum Load Capacity60m/s(200kg/sq.m)
Allowable Hail Load steel ball fall down from 1m height
Frame Anodized aluminium alloy
Junction Box Type IP65 rated
Connectors MC Plug Type IV connectors
Cables 4.0mm2, 900mm
Temperature coefficients
Nominal Operating Cell Temperature45±2ºC
Temperature coefficients of Voc (%)β -2.2mV/
Temperature coefficients of Pm (%)γ -0.55%/
Temperature coefficients of Im (%)α 0.03%/
Temperature coefficients of Vm (%)β -2.2mV/

Send a message to us:

Remaining: 4000 characters

- Self introduction

- Required specifications

- Inquire about price/MOQ

Q:How are solar panels developed and distributed in America?
The first link below is one of the best sites for recent news about solar panels. You should be able to find stories about solar panels under development today. A little bit of the history: Solar panels have been around for about 50 years now. They were first used to power spacecraft. Solar power for domestic use started to develop rapidly in the 970's during the first oil crisis, but as energy prices fell in the 980's solar development slowed. Most of the large solar panel makers were purchased by large oil companies who seemed not to be too interested in solar. In the late 990's as concerns about both Peak Oil and Global Warming grew there was renewed interest in solar power and a number of new companies were started to develop new kinds of solar panels. Many of these new companies have grown larger than the older solar companies still owned by big oil companies. Over the last 7 years or so growth in the solar market has been explosive with a compound growth rate of almost 40% per year. In 2005 the solar industry for the first time started to consume more silicon than all other electronic industries combined resulting in a world wide silicon shortage that is still with use. New silicon refineries are coming on line and the shortage is expected to diminish by 2008 or 2009. Check out the two links below. They will help you a lot.
Q:how many 45 watt solar panels would I need?
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:anybody got any info on solar panels for energy savings?
Q:How can I regulate current from a solar panel?
Lithium batteries do have special charging requirements. I would recommend that you use the 2 volt charger that came with them to keep them happy. Automotive power systems can have voltages as high as 4.5 volts when the engine is running so there's no need to limit the output of the panel to anything less than that. Check with the charger manufacturer to see what it will withstand. Some will work with systems up to 24 volts nominal (up to 29 volts actual) found in larger commercial vehicles such as trucks and busses. If your charger will work with both 2 and 24 volt systems you might not need anything extra to use the unregulated output of the panel. Otherwise I'd recommend a shunt regulator to clamp the output of the panel to no more than 4.5 volts. That way it would dissipate (waste) very little of the panel's power, and even that would only be during those rare times when the panel is producing maximum output. Such a device could be as simple as a high power zener diode, a low power zener coupled with a power transistor, or a precision shunt regulator such as a TL43 coupled with a power transistor. A more complex way would be a to use buck/boost regulator between the panel and your charger. You might gain a slight advantage under low light conditions when the panel isn't putting out much but the overall efficiency could end up worse than the simpler shunt regulator. Under optimum conditions, I would expect it to take a full day for a 3 watt (peak) panel to charge just one of your 35 Wh batteries. Charging an intermediate device such as the Sherpa 50 through its built in charger and then using it to charge your battery through yet another charger would severely cut your overall efficiency. Depending on how long you'll be gone, it might be far more practical, reliable, and economical to just carry (or find a way to be resupplied with) a few additional fully charged 35 Wh batteries. Don
Q:can solar power panels installed at home provide enough electricity to power house hold appliances?
They can but it takes a lot of panels. A home averages about kw power. Peak power is higher (3-6 kw) but you can handle that with load leveling storage batteries. The total maximum solar flux is about kw/square yard (or square meter). Solar panels are around 0% efficient. Because the Sun travels across the sky, the overall power is about /2 this maximum but then ony during the day (/2 the time). Since you need to recharge your batteries for nighttime, etc. and battery charging is about 50% you lose abother factor of two. So, assuming the Sun shines every day, you can power your house on 80 square yards (700 square feet of solar panels). This is still very rare because the investment in solar panels, batteries, converters, etc. far outweighs what you spend for commercial electricity.
Q:how long does it take for a solar panel to make one watt?
There is no such thing as a megawatt per hour. Watts aren't a unit of energy, watts are a unit of power. Power is the rate at which energy is converted. Power is to energy as speed is to distance. Watt-hours or the famous kiloWatt-hour are units of energy. Also the Joule is the more scientific unit of energy.
Q:Maintenance of Solar Panel?
panels need full sun. any shade reduces out put. leaves left on them will cause the individual cells burn out. they nneed adjusting every season, an washed with a soft cloth once a year.
Q:How do you make your own solar panels?
Well, I can think of a couple places, that you might have got that info from. There are several plans on the net. to build solar heaters from auxillary window units, to full thermal mass walls, with stacked 55 gallon barrels painted flat black, and filled with water. Old Mother Earth News magazines are a great source for these, but its basically sittin a closed box in the sun. . . Not very sexy, and not exactly Rocket Science, I'm thinkin what your askin about is Photovoltaics. Basically a reaction in a silicon chip, that pushes an electron toward the grid. Electiricty producing solar panels, are beyond the capabilities of a single person, however, they''re are (or were a couple months ago). a couple retail sales OKorder stores, scavaging they''re broken panels, cutting out the individual single cells, and then selling them as kits, with instructions how to wire, solder and assmeble working cells. Thats probably what your hearing about, and I think they ended up being about /2 price what they''re new ones sell for. Then you can move on to the bottlemeck problem, that all the green alternative ideas run into . . .How to store it Good luck, and Good Hunting . . Tim
Q:solar panel efficiency in space?
I'm not sure on the exact numbers of solar panel efficiency, however i do know that at the radius of the Earth we should be receiving about 000W of power per square meter. This value is lessened by the atmosphere to a value closer to 600W per square meter on the Earth's surface. (on a really hot day) That's a 40% drop in power due to the atmosphere. I'm assuming that the solar panels being in space don't affect it's efficiency (as in mechanically). So its power generation should increase by about 40% when in space compared with a ground based panel of the same design. Hope this helps, Sorry it's kinda sketchy info...
Q:Connecting solar panel help?
No. You can only hook them up as one or the other. Attempting to do both would simply short circuit the panels and you'd get no output at all. Your panels should produce an open circuit voltage in full sun that is almost twice the voltage of the battery you want to charge (it's because solar panels produce the most power at their maximum power point, which is usually about 60% of the open circuit voltage). If a parallel connection does that, then use it, otherwise you'll need to use series. You didn't say what the capacity and voltage of the panels or the size of the battery was. It's quite possible you don't have enough panel - you need panels that will put 5% (at least) of the ampere hours capacity of the battery in as current. For example, if you have a 00 amp-hour battery, you'll need enough panel to put 5 amps in at the voltage of the battery. DK
We introduced the newest production line, testing machine, laser cutting machine, non-Pb soldering line, module testing machine, laminating machine and so on. We use top-quality solar cells and EVA,TPT,strengthen glass,seal silicon etc. Our experienced staff work together well to assurance quality under effective ISO system. Our Products are exported to Europe, America, Africa and other Asian countries with safety certificate.

1. Manufacturer Overview

Location Guangdong,China (Mainland)
Year Established 2008
Annual Output Value
Main Markets North America 40.31%
South America 10.71%
Eastern Europe 4.02%
Southeast Asia 5.18%
Africa 5.18%
Mid East 5.18%
Central America 1.43%
Northern Europe 26.56%
South Asia 1.43%
Company Certifications IEC61215; CE certificate; ROHS Certificate

2. Manufacturer Certificates

a) Certification Name  
Validity Period  

3. Manufacturer Capability

a)Trade Capacity  
Nearest Port
Export Percentage 81% - 90%
No.of Employees in Trade Department
Language Spoken:
b)Factory Information  
Factory Size: 1,000-3,000 square meters
No. of Production Lines
Contract Manufacturing OEM Service Offered Buyer Label Offered
Product Price Range