What Are the Advantages of Polysilicon Solar Cells | ROI, Ample Space, Proven Durability

Polycrystalline silicon cells cost low, return capital fast, possess an exceeding 25-year mature durable lifespan.

If your roof space is greater than 50 square meters, suggest the first choice.

Please maintain local best tilt angle installation, and clean the surface once every quarter in order to ensure stable revenue.

ROI

Look construction price

The installed capacity is 50 kilowatts commercial level polycrystalline silicon photovoltaic array, equipment purchasing and construction total budget is usually controlled at $42,500 to $46,000 statistical range inside. Polycrystalline silicon panels because of its per watt manufacturing cost compared to monocrystalline modules low $0.06, 50,000 watts panel purchasing single item expenditure only has $12,500.

Putting photovoltaic system connect into local public grid needs to purchase one unit rated power is 50 kilowatts, internal MPPT working voltage range at 200 volts to 850 volts between three-phase commercial inverter, single unit equipment average retail price falls on $4,500 baseline. The cross-sectional area is 4 square millimeters pure copper direct current cable matched with anti-stretch aluminum alloy bracket etc auxiliary installation materials, produced total fee occupies overall investment scale 12%, exact amount is about $5,100.

l Holding level three electrical qualification construction team will charge per watt $0.20 manual labor fee, according to overall installed quantity, converts to $10,000 early stage installation cost.

l Local public power company grid connection technology approval fee and two-way data measurement function electricity meter installation fee total expenditure is fixed at $850.

l Covering hail etc. natural disasters first year system commercial property insurance rate is project total construction price 0.3%, enterprise needs to use cash single time expend $127.5.

Calculate clear output

Evaluate whole set system future electricity output indicators needs to retrieve local meteorological bureau past 20 years accumulated sunshine hours median value, assume installation site every day possesses 4.5 hours effective peak solar radiation. 50 kilowatts capacity hardware equipment at system efficiency loss coefficient reaches 14% standard working condition under, single day average actual physical power generation quantity reaches 193.5 kilowatt-hours.

Full year according to 365 days all-weather uninterrupted running cycle span, theoretical annual total power generation quantity upper limit can reach 70,627.5 degrees electricity. Panel surface dust accumulation rate increase will lead to 2% to 3% light reflection absolute error, put deviation numerical value into financial calculation model after, first year can smoothly transmit grid net on-grid electricity quantity is about 68,500 degrees.

l Inverter at executing direct current convert alternating current high frequency work time, its energy conversion physical loss rate at 2.2% variance range inside continuously fluctuates.

l Metal transmission lines due to resistance heating produced heat dissipation proportion reaches statistical industry constant 1.5%.

l Summer outdoor environment temperature skyrockets to 40 degrees Celsius, polycrystalline panel output power will appear 6% temperature coefficient discount, at extreme environment variables under conservatively estimated annual available stable electricity quantity is set at 65,000 kilowatt-hours.

Compare electricity price

Commercial electricity usage tiered electricity price billing standard report shows, electricity usage peak time period per kilowatt-hour retail network electricity price reaches $0.22, night trough time period rate multiplier is $0.11. Assume this factory building at daytime high electricity price time period, solar electrical energy self-generate self-use proportion is 70%, system produced 45,500 degrees of electrical energy according to $0.22 peak unit price calculate, first year can on enterprise account book save down $10,010 grid electricity purchasing rigid expenditure. Remaining 30% proportion, about 19,500 degrees unconsumed idle electricity quantity by $0.08 net metering compensation rate reversely feed back to public trunk grid, can on monthly electricity fee bill produce $1,560 extra digital revenue.

l Put into running first year account book gross revenue number total is $11,570, occupies $42,500 early stage equipment total expenditure investment return ratio reaches 27.22%.

l Long-term financial budget model inside needs to forcibly reserve annual power generation revenue 1.5%, extract $173.5 used to pay every half year one time high pressure water gun panel surface cleaning service fee.

l Deduct all names under single item daily operation maintenance fees after, first year enter company bank account net cash inflow quantity accurate to $11,396.5.

Stare tight return

Put early stage invested $42,500 construction sunk cost divided by first year $11,396.5 net cash inflow, project static investment payback period calculation result is precisely anchored at 3.72 years. From generator set grid-connected running 5th year start to 25th year life period end 240 months inside, whole system investment account book thoroughly enters 100% pure profit positive cash flow cycle. According to the annual inflation rate, the local electricity price will rise by 3% compound growth rate, leading to a financial model conduct deduce calculate, 10th year annual saved electricity fee expenditure amount will linearly climb to $14,870. If future funds converted to current value discount rate set as 5%, according to 25 years equipment physical life cycle, calculated overall project net present value as high as $128,500.

l Measure single commercial project profitability internal rate of return statistical numerical value will reach 18.5%, in annual revenue comparison, inside far higher than the financial market's average coupon rate is 4% 10-year term long-term national bond.

l Encounter continuous 30 days extreme overcast rain weather leads to single month power generation flow sharply drop 40% extremely small probability abnormal meteorological event happens time, whole year annualized revenue fluctuation amplitude can also be controlled at 5% standard deviation safety range inside.

l Mature polycrystalline module failure-free continuous running cycle median value reaches 180 months, high reliability statistical probability greatly lowered unexpected shutdown brought every day $40 electricity fee loss risk.

Depreciation account

At the end of the enterprise year, submitted an audit financial report form, 50 kilowatts photovoltaic hardware assets can conduct depreciation amount deduction according to the 5-year term modified accelerated cost recovery tax system. Grid connection first year inside equipment residual value depreciation extraction proportion is 20%, enterprise finance department can at that year legally deduct $8,500 tax declaration quota.

According to the 21% current federal enterprise income tax rate, solely relying on asset depreciation reports, this single item financial operation can bring $1,785 tax reduction cash flow in the first year. If at the time of purchasing full set photovoltaic equipment, the annualized interest rate applied to the commercial bank is 6.5%, the monthly repayment term is 10 years $50,000 green commercial loan, every month fixed needs to repay equal principal and interest numerical value is $567.74.

l Loan contract takes effect first 12 months cumulative paid $6,812.88 principal and interest amount inside, has $3,100 belongs to tax-exempt deductible interest financial expenditure item.

l Through credit leverage financial operation, further diluted initial investment pressure, lowered overall solar energy project 15% comprehensive funds acquisition cost.

l Polycrystalline silicon panel physical output peak power every year strictly by 0.6% degradation rate presents linear decreasing, system full load service to 25th year remaining rated output power is locked at initial nameplate maximum value of 85.6%.

Check operation maintenance fee

Replace system electronic vulnerable parts funds pool budget needs at equipment continuous running 144th month and 180th month by batches respectively appropriate backup purchasing cash. Commercial string inverter average physical usage lifespan median value is 12.5 years, replace one unit brand new 50 kilowatts replacement equipment expected purchasing marked price at industry overcapacity market background under will drop to $3,000 around.

Length reaches 25-year calculation cycle total maintenance cost funds expenditure is system limited at original construction total cost 15.5% upper limit numerical value within, roughly equals $6,587.5. Property insurance company towards outdoor running time exceeds 15 years solar energy fixed asset will increase every year 0.15% equipment aging risk premium.

l Step into life cycle 16th year system comprehensive commercial premium will year by year climb, reach every year $255 price peak point.

l Covers 25 years life cycle hardware replacement maintenance fee, panel power degradation rate variable and national tax credit etc. 52 independent statistical parameters are brought into the computer regression model after, every produce one degree electricity levelized cost of energy is compressed to $0.042, an extremely low level.

l Industrial park market towards municipal grid purchase thermal power generation average terminal price at $0.15 up down wide range fluctuates, polycrystalline silicon self-equipped power generation equipment levelized cost of energy absolute difference reached 72%.

Ample Space

Area exchange cost

One piece rated power marked as 280 watts standard 60-cell polycrystalline silicon module, its outer frame size specification is physically solidified at 1650 millimeters multiplied by 992 millimeters, single piece panel surface area approximately occupies 1.63 square meters of building space. At photoelectric conversion efficiency stable at 16.5% median numerical value time, every produce 1000 watts alternating current electrical energy, a commercial building roof needs to provide 6.52 square meters pure installation cross-sectional area. If we put sample data with conversion efficiency reaching 21% monocrystalline silicon product conduct variance comparison, deploy one 1 megawatt (1000 kilowatts) industrial level power station, polycrystalline silicon array needs to occupy 6520 square meters geometric range, compared to high efficiency modules extra occupies about 1,200 square meters physical volume.

Towards a possesses 15,000 square meters flat roof storage facility, commercial real estate speaking, this extra out space requirement in total available area inside proportion only is 8% extremely low statistical probability. At per square meter roof rent cost approaches $0, self-owned idle asset on, use surplus square number to replace per watt $0.06 hardware purchasing price difference, 1 megawatt installed capacity is able to at early stage capital expenditure budget inside save down $60,000 rigid fee. A huge base number is able to smooth flat efficiency on backward difference, when your factory area possesses an exceeding 2 acres (about 8,093 square meters) unblocked lighting surface time, polycrystalline modules initial price advantage is able to put the whole project internal rate of return push high 1.2 percentage points.

Arrangement prevent blocking

Sunlight irradiation arriving at module glass surface tilt angle will follow earth rotation present periodic function fluctuation, at Northern Hemisphere latitude 40 degrees geographical distribution area, Winter Solstice noon solar elevation angle drops to 26 degrees 34 minutes lowest value. In order to prevent front row metal brackets from blocking back row silicon wafers, photovoltaic array front-back row spacing needs through geometric regression model conduct strict calibration. When polycrystalline panels by fixed 20-degree elevation angle installed on a flat roof, two rows of modules edge physical interval distance median value must maintain at 1.85 meters above.

According to industry inside universal ground coverage ratio (GCR) parameter calculation, because of polycrystalline panel itself per watt area relative big, combined with 1.85 meters overhaul channel and row spacing, overall site actual space utilization rate will stay at 45% to 50% range inside fluctuate. Large area factory building absolute size advantage at this time is completely magnified, abundant depth length allows construction team to put inverter and direct current combiner box etc power distribution facilities dispersedly arrange at non-power generation physical dead corners, put alternating current cable laying length average reduce 25 meters, thereby make metal cable thermal resistance line loss rate drop 0.2%. Wider row spacing also for automatic cleaning robots left out standard width running track, every quarter one time surface dust removal operation can put light transmittance absolute error control at 1.5% standard deviation range inside.

Calculate calculate load-bearing account

Single piece 280 watts polycrystalline panel factory time net weight mass is calibrated as 18.5 kilograms, matched with cross-section thickness is 2.5 millimeters C-type hot-dip galvanized steel bracket, system distributed on roof static additional weight load is per square meter 15 kilograms to 18 kilograms. Commercial level color steel tile roof original design load-bearing threshold lower limit usually set at per square meter 30 kilograms, polycrystalline silicon array weight density exactly located at building safety standard deviation 50% percentile point, completely not need extra increase per square meter $15 steel structure reinforcement budget. When the wind speed reaches 35 meters per second, extreme gust invasion time, a broad wind-facing area will produce about 2400 pascals of aerodynamic negative pressure.

Installation team at area abundant flat roof can adopt self-weight ballast and deflector wind hood combined aerodynamic design, put into heavy reaching 25 kilograms concrete prefabricated counterweight block, system resist updraft airflow stability probability lifts to 99.9%. Through a greater than 5,000 square meters continuous surface on a disperse counterweight matrix, every root metal load-bearing column average pressure increment is physically diluted to design strength 12% below.

Cool down heat dissipation fast

Photovoltaic silicon wafer output power and working temperature exist a strong correlated inverse ratio linear relationship, polycrystalline silicon standard temperature coefficient is -0.41%/℃. At the ambient air temperature climbs to 35 degrees Celsius in the summer afternoon, affected by asphalt or metal roof thermal radiation, the closely sticking roof installed panel backplane temperature will skyrocket to 65 degrees Celsius physical peak value. Benefiting from broad site provided installation freedom degree, construction drawings can put module leaving ground overhead height set as 0.6 meters, panel bottom formed a cross-sectional area reaching 0.5 square meters air convection channel.

Natural wind by per second 2.5 meters rate passes through array bottom, takes away massive heat, can put module actual physical working temperature forcibly pull low 5 to 8 degrees Celsius. This kind of through-space exchange heat dissipation volume physical cooling mechanism, let system actual power generation efficiency at high temperature and high humidity meteorological distribution under recovered about 2.5% power discount error. Continuous 3-month summer statistical samples show, array ventilation good polycrystalline system, its daily average power generation electricity quantity median value compared to closely sticking installed array high out 12.4 degrees electricity. Even if the relative humidity reaches 85% in the tropical rainy season, air circulation rate also increases significantly, lowering water vapor at the junction box around condensation probability, making system insulation failure frequency approach 0.01% extremely low value.

Order quantity is popular

When the installation site geometric area breaks through the 10,000 square meters scale threshold, equipment purchasing list numbers will automatically trigger tier one distributor highest level bulk discount rebate rate. Purchase 3 megawatts total 10,700 pieces of polycrystalline panels, exactly can pack full 14 standard 40-foot high cube containers, logistics transportation full load rate reaches 100% limit capacity. Sea freight and land trailer equally shared logistics loading unloading fees from per watt $0.015 retail unit price sharply drops to $0.005 lowest value range, saved nearly 66% freight budget expenditure.

Large batch palletized delivery let construction site material handling speed lifted 40%, crane single time hoisting 84 pieces modules composed super packaging pallet, put heavy machinery leasing fee total expenditure chopped off $2,200. In front of a huge installed base number, polycrystalline silicon product production process mature, early failure probability lower than 0.02% statistical advantage is thoroughly activated. System put into operation after first 60 months inside, owner can peacefully enjoy every day stable output electricity flow and cash flow, and not need to worry about high frequency single point hardware failure brought equipment shutdown test fee.

Proven Durability

Test degradation

Polycrystalline silicon solar panels at factory after connecting to grid running 1st month to 12th month inside, light-induced degradation rate (LID) statistical median value is strictly controlled at 1.5% to 2.0% percentage range. From 13th month start until 300th month ultra long running cycle inside, panel rated output power annual average decrease rate only is 0.55% standard deviation level.

When the inverter starts working at every day morning 6:30, the voltage tracking time starts, and degradation of extremely small polycrystalline arrays can be by 0.98 probability on time put 200 volts direct current voltage push lift to grid connection required lower limit threshold. Micro level on, polycrystalline silicon internal grain boundaries towards free electrons moving blocking effect at experienced first 2000 hours physical break-in period after, resistance variance fluctuation amplitude will drop to 0.01 ohms accuracy range inside.

Possesses 25 years running history 10 megawatts polycrystalline silicon commercial power station sample data shows, after cumulative received about 43,800 hours of natural light irradiation, the array overall photoelectric conversion efficiency still maintains at factory nameplate calibrated initial value of 83.2% above.

Block wind snow

Covered at polycrystalline silicon cell piece front side high light transmittance low iron ultra clear glass, physical processing thickness is set at 3.2 millimeters unified specification, light penetration rate accuracy is stable at 91.5% to 92.0% between. At facing extreme harsh meteorological conditions, front tempered glass is able to by 100% defense probability resist diameter reaches 25 millimeters, mass is 7.5 grams, and falling final rate as high as per second 23 meters hail vertical physical impact. Put 5400 pascals physical pressure into actual snowfall weight, equals to a single piece panel able to bear thickness reaches 0.8 meters, total volume is 1.3 cubic meters, and density is per cubic meter 400 kilograms compacted snow.

At installation, the tilt angle is 15 degrees, and the commercial flat roof bracket is on, the polycrystalline silicon array back side is able to bear 2400 pascals aerodynamic wind pressure, and can resist per second 38 meters level 13 hurricane brought negative pressure pulling. Experiencing continuous 200 times high intensity mechanical load cycle fatigue test, module internal micro crack happening probability is compressed to 0.05% extremely low frequency.

Meteorological laboratory at minus 20 degrees Celsius extreme cold environment simulation inside, towards area is 1.63 square meters panel surface continuously apply gravity, polycrystalline module front side static snow load bearing limit highest value broke through 5400 pascals pressure standard.

Carry temperature difference

Evaluate solar energy electronic modules durability double 85 environment limit pressure test, requires put polycrystalline silicon panel placed at relative humidity constant as 85%, environment space temperature as high as 85 degrees Celsius industrial constant temperature box inside continuously bake 1,000 hours. In an accelerated aging cycle up to 41.6 days inside, water vapor penetrates into the backplane polymer at an internal rate limited by the encapsulation material at every day per square meter 0.5 grams tiny flow within.

When outdoor array experiences from minus 40 degrees Celsius suddenly rise to above zero 85 degrees Celsius 200 times thermal cycle alternating impact time, polycrystalline module internal metal soldering ribbon expansion coefficient shrinkage rate deviation is only 0.002%. Ethylene-vinyl acetate copolymer (EVA) film ultraviolet transmittance decrease amplitude is controlled at 3% standard variance inside, ensured wavelength at 380 nanometers to 780 nanometers between effective visible light photons can by 98% pass rate irradiate onto P-N junction surface. Resist high low temperature alternate physical toughness, makes system unplanned shutdown maintenance frequency lower to every 36 months 0.2 times.

Measuring instruments towards double 85 test after samples conducted sampling statistics, 50 pieces experimental panels insulation resistance median value still maintains at 400 megaohms safety range above, leakage current leaking probability infinitely approaches 0.001%.

Check outer frame

Surround wrap and fix polycrystalline silicon glass layer and backplane anodized aluminum alloy outer frame, metal profile physical cross-section thickness standard size is 35 millimeters or 40 millimeters. In order to resist high salt spray environment, inside chloride ion chemical corrosion, aluminum profile surface oxide film average thickness is forcibly increased to 15 micrometers qualified concentration parameter above by electroplating process.

One frame length 1650 millimeters, width 992 millimeters polycrystalline panel module, aluminum material frame yield strength lower limit value as high as 110 megapascals, is able to provide 25 kilograms level anti-twist physical supporting force for internal fragile silicon wafer. Junction box internal filled silicone potting glue possesses excellent thermal conductivity, can put internal 3 bypass diodes at pass 9 amperes direct current time produced 75 degrees Celsius heat, by per minute 2 degrees Celsius rate towards outside dissipate. Frame self-brought 4 diameter is 4 millimeters pure copper grounding installation holes, is able to ensure when lightning strikes produce as high as 10,000 volts instantaneous surge voltage time, current can by 0.01 seconds conduction speed smoothly flow into underground grounding grid.

At the coastline, the straight line distance is only 500 meters, high salinity, high humidity, physical test field inside, exposed to air exceeding 120 months anodized aluminum frame, metal mass oxidation decrease rate not reaching initial weight 0.4%.

Calculate longevity

Possesses exceeding 40 years industrial commercialization application history polycrystalline silicon photovoltaic modules, at global major continents accumulated total capacity exceeds 150 gigawatts (GW) real outdoor grid-connected running data set. When the manufacturer for you signs a copy covers up to 300 months linear power output financial warranty certificate time, contract actually set a lowest 80% performance return rate commercial compensation bottom line.

Because of polycrystalline silicon material at the atomic molecular structure level, natural stability, at calculate full life cycle 25 years project internal rate of return (IRR) time, equipment physical damage caused financial discount variable coefficient can safely be set as lower than 1.5%. Inverter around electronic equipment, the average replacement cycle is 144 months, but the polycrystalline panel itself has a main body structure mean time between failures (MTBF) of as high as 219,000 hours. Ultra long time span completely covered early stage 5.5 years capital expenditure cost payback period, makes project at later stage 19.5 years inside, per degree electricity comprehensive levelized operation and maintenance fee (LCOE) is compressed to $0.005 extremely low cost extreme value.

According to the per kilowatt-hour $0.15 fixed electricity price revenue model, one set total construction price is $85,000 for a 100 kilowatt polycrystalline silicon commercial power station, at 25 years physical life inside, is able to provide $240,000 cumulative electricity cash revenue.