Why Choose Poly Solar Modules | Durability, Performance Stability, Applications

Polycrystalline solar panel efficiency generally is 15%–18%, life can reach 25 years above, withstand high temperatures, resist wind and snow.

Suitable for residential, commercial industrial roofs and photovoltaic farms, can through series parallel combination lift power, realize flexible layout and stable power generation.

Durability

Frame hard

Polycrystalline module external framework adopts 6063-T5 custom anodized aluminum alloy material, periphery cross-section thickness parameter strictly controlled at 35 millimeters to 40 millimeters standard interval inside, metal surface oxide film thickness reaches 15 micrometers to 20 micrometers. Industrial production assembly line inside, this metal material needs experience 175 degrees Celsius to 200 degrees Celsius aging treatment furnace inside constant temperature bake 2 hours to 3 hours, making its yield strength value pull up to every square millimeter 110 Newtons above index.

At the static load laboratory, the physical pressure test platform is on, four corners through stainless steel bolts rigidly fixed after, the module front face needs to evenly bear 5400 Pascals static mechanical load. In order to adapt to the cross-sectional area of 41 millimeters, multiply 41 millimeters standard C-type galvanized steel bracket channel rail, aluminum frame back surface installation holes center spacing tolerance is precisely limited at plus minus 0.5 millimeters physical size range inside.

· According to every cubic meter, 400 kilograms of snow density statistics calculation, 5400 Pascals bearing pressure equals to panel surface piled up thickness reaches 1.35 meters solid state compacted snow layer.

· At wind tunnel dynamic airflow scour test link, module back surface bearing negative pressure limit value reaches 2400 Pascals, completely can resist wind speed is per second 35 meters gust impact, wind force destroy grade equivalent to 12 grade above strong storm environment.

· Experience as long as 120 hours continuous high frequency mechanical vibration fatigue test, aluminum alloy frame welding nodes micro crack spread ratio always maintains at 0.01% extremely low probability below.

· At minus 40 degrees Celsius to 85 degrees Celsius, extreme alternating temperature experiment inside, aluminum frame thermal expansion cold contraction deformation rate is limited at 0.2% deviation accuracy within.

Glass not fear smash

Covered by a polycrystalline silicon cell right above the physical protection layer is one piece of precisely cut 3.2 millimeter ultra-white patterned tempered glass. The glass substrate surface smeared has one layer thickness of 120 nanometers to 150 nanometers anti-reflection porous silicon dioxide coating layer. Nano-grade optical thin film will wavelength at 380 nanometers to 1100 nanometers interval inside the solar spectrum light transmittance pulled high 2.5 percentage points, prompt glass panel overall transmittance parameter steadily maintains at 93.5% to 94.2% between peak value. Laboratory aiming at extreme hail weather introduced pneumatic launch device conduct destructive physical verification, through high pressure airflow will ice blocks high speed shoot out to test glass mechanical impact fatigue degree.

· Pneumatic launch muzzle will diameter precisely set as 25 millimeters solid ice ball, by per second 23 meters linear acceleration shoot toward glass panel surface 11 different coordinates test sampling points.

· Ice ball at contact glass surface millisecond grade instant release out kinetic energy value about is 1.99 Joules mechanical impact force, glass internal tensile stress distribution variance maintains at allowed safe test threshold inside.

· At impact, the happen after 50 milliseconds observation time inside, glass panel deformation amplitude is measured by instrument at 2 millimeters to 3 millimeters tiny change range inside, internal encapsulated polycrystalline silicon cell hidden crack probability lower than 0.5%.

· Tempered glass leaves the factory before surface hardness parameter reaches Mohs hardness 6.0 to 6.5 grade, can effectively resist desert area wind sand weather inside diameter 0.1 millimeters to 0.5 millimeters suspended sand particles as long as 10 years continuous physical wear.

Withstand cold and hot

Photovoltaic module at assembly craft process inside universally adopt thickness between 0.45 millimeters to 0.5 millimeters Ethylene-Vinyl Acetate copolymer film conduct up down double layer vacuum lamination seal encapsulation. Set laminator closed chamber inside, heating platen temperature lift to 145 degrees Celsius and keep 15 minutes to 20 minutes high temperature curing cycle after, internal film cross-linking degree parameter standard requires must greater than or equal to 85%.

High cross-linking degree polymerization network chemical structure ensured photovoltaic panel at face violent temperature difference fluctuation time, internal arranged 144 pieces half-cut cell structural parts will not happen millimeter grade physical displacement. The International Electrotechnical Commission set TC200 thermal cycle test standard to it, and executed an extremely strict temperature gradient pressure simulation experiment.

· Program-controlled test equipment will environment chamber inside temperature from minus 40 degrees Celsius uniform speed pull up to 85 degrees Celsius, and at two positive negative extreme temperature points respectively maintain 10 minutes constant temperature stay time.

· Experience continuous 200 complete extreme hot extreme cold alternating cycle periods (total time cost about 1000 hours) after, polycrystalline module electric power output decay rate must be less than 5% standard allowed deviation value.

· Module back surface fluoroplastic composite insulation backplane thickness maintains at 0.3 millimeters to 0.35 millimeters specification inside, water vapor transmission rate index is forced required lower than every day per square meter 2 grams value.

· High polymer backplane material at continuous bear system highest direct current rated run voltage 1500 volts application environment under, insulation leakage resistance value can long time maintain at 500 megaohms above safe monitor interval inside.

Carry salt spray corrosion

Metal anti-corrosion test chamber inside automatically proportioned concentration precisely is 5% sodium chloride pure water solution, utilize ultrasonic atomizer will it by per hour 80 milliliters flow rate convert to fine dense suspended spray. Closed chamber inside environment temperature constant heat kept at 35 degrees Celsius, relative humidity index continuous maintained at 95% to 98% extremely saturated wet interval. High concentration corrosive climate simulation test purpose lies in verifying external metal support structure parts, direct current lead-out cables as well as edge seal silicone material long-term chemical element stability.

· At as long as 96 hours uninterrupted continuous high pressure salt spray fall operation inside, anodized aluminum frame surface oxide layer corrosion weight loss rate only is detected as per square meter 0.02 grams tiny loss.

· Module back surface attached collection junction box adopted modified polycarbonate flame retardant plastic injection molded shell, exposed to salt spray environment under internal IP68 grade waterproof dustproof seal silicone gasket volume expansion rate lower than 1.5%.

· The internal diodes' cross-sectional area is 4 square millimeters, tin-plated copper core, external cable, exposed to high salt content environment 30 days after, conductor direct current conductive resistance increase rate limited at 2 milliohms tiny error range inside.

· Panel edge glue spread operation adopted two-module polyurethane seal silicone, after experience high concentration salt spray ions erosion, tensile shear peel strength still maintains at 1.5 megapascals above, prompt external free water vapor invade glass inside probability reduced 90% ratio.

Performance Stability

Decay slow

Polycrystalline silicon crystal structure at initial illumination expose head 250 hours operation cycle inside, silicon wafer internal residual boron-oxygen complex will happen violent physical combination reaction, trigger initial Light-Induced Degradation physical phenomenon. At rated power set as 275 watts standard batch test sample group inside, polycrystalline photovoltaic module first year output power drop amplitude is forced limited at 2.5% upper limit index value inside, assembly line off-line product actual measured median value maintains at 1.8% to 2.1% stable interval.

Experience front 365 days initial physical run-in period, silicon wafer internal crystal lattice carrier life steps into steady state, from 2nd year run cycle extend to 25th year, module panel annual linear monotonic decay rate parameter highest peak value is set at 0.7% error boundary inside. When power station equipment continuous no fault run reaches 300th month time node, terminal actual measured output absolute power reading still maintains at initial nameplate nominal value 80.5% above, long term power generation efficiency statistics variance extremely small.

Not fear hot

Photovoltaic panel at outdoor real meteorological environment inside power generation rate receive glass surface real-time temperature fluctuation restrict, polycrystalline silicon material power temperature coefficient at laboratory leave factory calibrated as negative 0.40% per degree Celsius. Standard test conditions fixed will 25 degrees Celsius set as comparison baseline, when summer noon sun high intensity direct shoot causes glass panel surface temperature climb to 65 degrees Celsius high temperature extreme value point, 40 degrees Celsius positive direction physical temperature difference will cause system instant output power appear 16% ratio discount loss.

Single piece cell module open circuit voltage temperature coefficient parameter locked at negative 0.30% per degree Celsius range inside, short circuit current temperature coefficient expresses as positive direction 0.05% per degree Celsius weak growth rate. At wind speed set as per second 1 meter, environment room temperature 20 degrees Celsius normal rated working temperature laboratory full closed environment inside, polycrystalline module front back face steady state temperature distributes at 45 degrees Celsius up down float, heat sensor measurement error accuracy is controlled at plus minus 2 degrees Celsius narrow amplitude deviation interval.

Cloudy day has electricity

At sunrise and sunset, front and back 120 minutes, as well as sunset front back 120 minutes low illumination run time period, polycrystalline silicon surface porous silicon dioxide anti-reflection film layer to incidence angle is 60 degrees to 80 degrees extreme oblique light maintains 90.5% above physical penetration transmittance. When external meteorological conditions turn to thick cumulonimbus cloud layer shield overcast rain weather, environment absolute illumination radiation intensity sharply decays to per square meter 200 watts low sluggish data index, polycrystalline internal messily arranged crystal boundary to spectrum wavelength at 400 nanometers to 700 nanometers between diffuse reflection visible light possesses extremely high photon capture probability.

At this kind of low intensity incidence diffuse reflection light irradiation under, photovoltaic string inverter end grabbed weak direct current current can continuous maintain at 1.6 amperes to 1.8 amperes continuous turn-on range inside. Compare per square meter 1000 watts absolute standard light intensity test baseline parameter, panel at per square meter 200 watts low light intensity environment under relative photoelectric conversion efficiency still stands firm at 95.5% to 96.5% statistics median level line.

No leak electricity

At 20 pieces panels series connected, high voltage direct current array loop inside, two ends module metal aluminum frame and internal silicon wafer will accumulate as high as 1000 volts to 1500 volts potential physical potential difference. High humidity meteorological environment induced active sodium ion migration phenomenon will penetrate a 0.5-millimeter thick ethylene-vinyl acetate film layer, at the cell surface, forming a destructive short circuit channel, triggering Potential Induced Degradation phenomenon.

Polycrystalline panel at automation assembly line lamination assembly stage toward encapsulation high polymer film inside doped volume concentration is 0.5% to 0.8% special use anti-leak electricity chemical additive, pull film internal volume absolute resistivity parameter forced lift to every cubic centimeter 10 to the 15th power ohms above insulation grade. At an environment temperature of 85 degrees Celsius and relative humidity fixed at 85%, double 85 limit laboratory full closed test chamber inside, panel continuous bear 1500 volts direct current bias voltage as long as 192 hours electrical limit torture, nominal output power irreversible reduce rate is suppressed at 2.5% to 3.5% extremely low dispersion degree interval.

Applications

Pave factory building roof

The area reaches 15000 square meters single layer color steel tile structure industrial building, its top static load bear extreme value usually limited at per square meter 15 kilograms to 20 kilograms physical standard range inside. Physical specification set as 1640 millimeters multiplied by 992 millimeters, single piece weight 18.5 kilograms standard polycrystalline silicon panel, cooperate cross-sectional area thickness is 2.5 millimeters lightweight aluminum alloy guide rail, can will roof per square meter additional weight absolute value control at 11.8 kilograms fault tolerance interval inside.

At tilt angle set as 15 degrees to 20 degrees, conventional array layout under, above building area can densely install installed capacity reaches 1.5 megawatts photovoltaic power generation system. This direct current power generation module through a total length of about 3500 meters 4 square millimeters cross-sectional area red copper cable parallel assembly, merge into rated conversion efficiency as high as 98.5% three-phase string inverter, finally will output voltage value constant at 400 volts or 480 volts alternating current industrial grid standard.

According to full sunlight hours, the average value reaches every day 4.5 hours latitude geographic data calculation, 1.5 megawatts polycrystalline array every year accumulated power generation total amount maintains at 2.46 million degrees (kilowatt-hours) statistics median level.

Farm also can pave

Large area economic crop plant area above built hot-dip galvanized steel bracket pillar, its vertical height parameter is forced lift up to 2.8 meters to 3.5 meters space three-dimensional size inside, ensure bottom crawler type agricultural machinery possesses plentiful operation clearance margin. Polycrystalline module at square array layout gap reserved 35% to 45% light transmittance distribution proportion, allow wavelength at 400 nanometers to 700 nanometers visible light penetrate panel gap reach ground surface, satisfy shade-grown broadleaf plant photosynthesis needed every day average 8 to 10 moles per square meter photon flux density requirement.

At floor area index is 10 hectares, modern farm calculation model inside, array square array total installed scale can expand capacity to 6.5 megawatts peak power. Face farm environment inside high frequency appear nitrogen-containing fertilizer volatilize gas, polycrystalline module frame edge sprayed anti-corrosion insulation polyurethane seal glue at concentration reaches 50 parts per million ammonia gas accelerated aging test chamber inside continuous expose 480 hours after, peel strength drop amplitude maintains at 0.8% low tiny tolerance range inside.

Agriculture greenhouse scene inside every day as high as 85% to 95% extreme saturated relative humidity, requires module backplane water vapor transmission rate value must be lower than every day per square meter 1.5 grams.

Built in wasteland inside

Solar radiation intensity exceeds per square meter 1000 watts arid desert zone, and the ground surface highest environment temperature extreme value at noon time frequently breaks through 55 degrees Celsius observation upper limit, polycrystalline silicon product leaves factory set negative 0.40% per degree Celsius power temperature coefficient at this time produces obvious physical restrict effect.

In order to resist wind speeds as high as 28 meters per second, physical friction, external covered 3.2 millimeters tempered glass leave factory before accepted quartz sand stream continuous blow hit test, surface roughness root mean square value increase amount less than 0.2 micrometers, overall panel light transmittance reduce rate is suppressed at 0.5% extremely low error accuracy inside.

Centralized ground power station single body installed capacity usually set at 50 megawatts above statistics scale, cooperate single-axis pan tracking mechanical bracket, module array elevation angle can realize plus minus 60 degrees wide amplitude dynamic range adjust, capture early morning evening low angle oblique shoot light, will single watt annual power generation amount absolute gain pull lift 15% to 18% percentage.

50 megawatts grade desert photovoltaic asset project needs pave total length exceeds 120 kilometers low voltage direct current wire cable, per megawatt construction equipment and auxiliary material purchase budget usually frozen at 600 thousand US dollars to 650 thousand US dollars float range inside.

Cover parking lot

Commercial matching open-air parking plaza space utilization rate transform project inside, by polycrystalline silicon module built steel structure sunshade roof usually according to 5 degrees to 10 degrees tiny tilt angle conduct flat lay layout. One planned to accommodate 500 standard parking spaces in a rectangular parking area, with a total projection cover area of about 7500 square meters, physical space can integrate install nominal total power value is 1.2 megawatts power generation square array.

Bottom support double pillar hot-rolled H-beam steel structure will module down edge off ground clearance height locked at 2.5 meters to 2.8 meters safe distance, perfectly avoided height parameter is 2.2 meters below various types of passenger vehicles top collision risk. The whole power generation network produces direct current electricity, and experience on-site invert transform process, can full amount for access terminal 20 units rated output power is 120 kilowatts direct current fast charge piles provide continuous not stop physical energy source.