How Do You Evaluate Solar Project Feasibility | Site Conditions, Sunlight Access, Regulations

Evaluate land use slope <15°, no block rate ≥90%, year average sunshine ≥4 h; verify grid-connection capacity, electricity price and approve cycle (about 3–6 months), measure calculate IRR ≥8% feasible.

Site Conditions

Look at the roof

Install solar energy system before survey asphalt tile roof's physical wear and tear state, need to confirm existing roof surface material maintains at least 15 years to 20 years' use life span. The roof house age reaches 12 years, and the tile piece surface's glass fiber particle loss rate exceeds 20%. The photovoltaic bracket's hit hole construction will increase local leak water probability to 15%.

The total area is 2000 square feet's standard residence roof, artificial add-on material budget needs to spend 7000 US dollars to 10000 US dollars. At pave set 25 pieces, the total weight reaches 500 kilograms' photovoltaic panel before complete roof turn new, exempt future 5 to 8 years inside due to tear down solar energy system repair roof produced's every time 1500 US dollars to 2500 US dollars' secondary tear down install artificial fee.

· Roof bottom layer water proof roll material's thickness reaches 30 mils (mil)'s standard, takes future 25 years inside's seep water repair fee use lower 80%.

· Roof surface tilt angle at 15 degrees to 40 degrees interval inside, rain water scour panel's natural clean efficiency reaches 95% peak value.

· Surface artificial clean frequency drops to every year 0 times, saving down single time 300 US dollars' maintenance budget.

Calculate bear weight

A root standard 2x4 inches specification wooden roof truss's center gap distance design is 16 inches or 24 inches. Evaluate personnel at every fix point, use length is 3 inches to 5 inches' galvanized no rust steel square head bolt, drill enter wooden cross beam's depth reaches at least 2.5 inches, satisfy local per hour 120 miles' anti wind load lowest standard.

Drop snow amount big's high latitude cold area, roof structure's design bear pressure capacity needs to reach per square foot 40 pounds to 60 pounds' snow load parameter. Increase one set weight per square meter 20 kilograms' photovoltaic equipment after, static deflect turn displacement exceeds roof span degree's 1/240, needs to increase extra's wood material carry out structure add solid.

· The size is 2x6 inches' wood board carry out inside part support add solid, material and artificial cost according to per straight line foot 15 US dollars to 25 US dollars' price calculate.

· Single piece area about 2 square meters' panel at bear per hour 90 miles' array wind time, produces about 150 pounds' towards up pull rise pull force.

· Every fix bracket's anti-pull force physical test data must not be lower than 300 pounds' threshold value.

Walk conduct wire

From roof-top photovoltaic array to ground surface inverter's direct current cable walk wire length exceeds 100 feet, produces about 1.5% to 2.5% voltage drop loss. Take direct current end's transmit efficiency to maintain at 98% standard line, install team adopts diameter more thick's 10 AWG or 8 AWG specification's copper core electric wire. Pave set metal guide flow tube's physical route every increase 10 feet, object material cost and construction artificial fee correspond increase 120 US dollars to 180 US dollars. Outside exposed at roof surface's electric wire use possess anti ultraviolet ray grade's THWN-2 model number wire cable, bear summer high up to 70 degrees Celsius to 85 degrees Celsius' roof local high temperature environment.

· If the ambient temperature rises by one degree Celsius, the wire cable's carrying current capacity drops 0.5%.

· The conductor's maximum allowable current capacity must pre-leave out 156% of the safe design surplus amount.

· Alternating current cut road device to grid-connection electric meter's connect pipe line keep at distance ground surface at least 18 inches' hidden ditch trench middle, use thickness is 0.065 inches' rigid nature metal guide tube provide physical protection.

Check distribute electric box

Residence existing's main trunk electric panel capacity is 100 amperes, according to the United States national electric specification's 120% rule, gather flow row most many only can connect enter capacity is 20 amperes' photovoltaic reverse direction feed electricity cut road device. A continuous output power reaches 7.6 kilowatts' standard family use inverter, at 240 volts' alternating current voltage, produces a highest 32 amperes' current output.

Safe Connect enters this 32 amperes' current, and installs a specification of 40 amperes' double pole cut road device. This 40 amperes' cut road device, the main distribute electric panel's gather flow row rated value needs to reach 200 amperes, the main cut road device keeps at 200 amperes, allowed's photovoltaic reverse direction input current maximum upper limit reaches 40 amperes.

· Old's 100 amperes distribute electric box upgrade arrive have 40 pieces can use cut road device insert slot's 200 amperes new distribute electric box, hardware procure price between 150 US dollars and 300 US dollars.

· Hold certificate electric worker upgrade distribute electric box's single time install service fee reaches 1200 US dollars to 2000 US dollars.

· Capacity upgrade project needs electric grid company match combine cut electricity 4 hours to 6 hours complete physical thread route's replace change.

Measure mud earth

No way at roof top install but choose ground surface bracket's 7 kilowatts level photovoltaic project, pre-leave out area about 450 square feet to 600 square feet's continuous flat neat earth land. Install earth shape's natural slope degree exceeds 15 degrees, push earth machine flat neat earth land's earth square project budget according to per cubic yard 50 US dollars to 85 US dollars' standard increase.

Support solar energy panel array's galvanized zinc steel tube stand pillar hit enter ground under deep reaches 36 inches to 48 inches, down sink depth requires exceed local winter season earth soil freeze tie line at least 6 inches. The Earth quality module contains more than 30% rock stone's field ground on carry out drill hole construction, every drill a diameter is 12 inches' concrete soil stake hole, equipment rent lease and artificial consume time will cause single piece foundation's cost to rise up to 150 US dollars to 250 US dollars.

· Ground surface photovoltaic system's alternating current cable connect enter main house distribute electric box, dig excavate a strip depth reaches 24 inches, length at 50 feet to 150 feet between's under ground cable ditch.

· Dig, excavate, and return fill ditch canal's construction fee use per foot 8 US dollars to 15 US dollars.

· Underground construction meets arrive diameter exceeds 2 inches' tree root, earth build cycle extra extend long 1 day to 2 days.

Sunlight Access

Look face direction

Roof tilt slant surface face towards direct south direction (azimuth angle 180 degrees) time, panel receives solar radiation amount reaches 100% theoretical peak value. Face towards south-east or south-west direction's roof, azimuth angle deviate difference at 45 degrees within, total power generation amount only will produce about 4% to 7% light slight decline reduce. If it is a pure east or west-facing roof, due to receiving only up noon or down noon half day's direct sunlight, system power generation amount will big margin drop fall 15% to 20%.

In California, etcetera, execute divide time electricity price (TOU)'s area, down noon 4 o'clock to late at 9 o'clock's electricity price high reach per degree electricity 0.45 US dollars to 0.55 US dollars. Take panel install at face west's roof top, down noon time period output's power can cover high electricity price time period, let per degree electricity's finance return report rate reverse direction pull rise 12% to 18%.

Install at lean north face direction (azimuth angle 315 degrees to 45 degrees between)'s panel, receive arrive's effective light shine sharp reduce 30% to 45%, a set capacity is 8 kilowatts' system year power generation amount from 12000 degrees drops to 7500 degrees, invest return receive period by force from 6.5 years pull long to 11 years above.

Calculate cover block

A tree height degree reaches 40 feet's oak tree if at noon 10 o'clock to down noon 2 o'clock between, at solar energy array on throw shoot out area only occupies 2%'s shadow, adopt tradition string connect reverse change device system's whole body output power will blink instant violent drop 33% above. Measure quantity shadow heavy match rate use Solar Pathfinder etcetera sun shine track trace instrument, catch grasp one year 12 months inside sun high degree angle from winter season's 25 degrees to summer season's 70 degrees between's position shift track trace.

Smoke chimney or roof top row gas tube throw shoot's hard shadow cover at single piece long wide is 65 inches multiply 39 inches' panel on exceeds 3 pieces electric pool pieces (about occupy total area's 5%), touch send side route two extreme tube start up, cut break whole piece panel 1/3's voltage output.

Take tradition's single phase gather center style reverse change device change replace as every piece panel independent equip match's micro type reverse change device (single price about 130 US dollars to 160 US dollars), or at original system add install power optimize device (single price about 60 US dollars to 85 US dollars), can take local part shadow cause make's system total power generation amount lose lose from 30% press shrink to 5% to 8%'s interval inside.

Calculate sunshine time

Arizona state Phoenix city's year average every day peak value sunshine time number reaches 6.5 hours, the same kind one set install machine capacity is 10 kilowatts' equipment, at local ground number one year can produce out 18500 degrees electricity.

Take the same set of equipment flat shift to Washington state Seattle city, local ground year average peak value sun shine drops to every day 3.2 hours, head year power generation amount produce out shrink water to 9200 degrees electricity. Use a 10 kilowatt system to generate electricity, resist canceling every month 1,000 degrees of electricity's family consume exhaust, Seattle's business master needs to take system capacity increase add to 16 kilowatts to 18 kilowatts, front period's equipment procurement buy and artificial total budget from 28000 US dollars whirlwind rise to 45000 US dollars.

When the average peak value of sunshine time is lower than 3.5 hours' down limit, the system's degree electricity cost (LCOE) will climb rise to per degree electricity 0.18 US dollars to 0.22 US dollars between, one morning local ground public electric grid's live people electricity price lower than per degree 0.15 US dollars, this pen hard piece invest will produce negative direction's year transform receive benefit rate.

Measure sun angle

Panel's physical tilt slant angle complete match fit room house place locate geography position's latitude number value (example such as Houston's latitude is north latitude 29.7 degrees), system able to catch obtain one year 365 days inside most big transform total amount's 98% sun radiation. Actual residence roof top's slope degree normal often fixed at 4/12 to 6/12 (change calculate as angle about 18.4 degrees to 26.5 degrees) between. At one latitude, a 40-degree city, take panel paste fit lay set at 20 degrees tilt angle's roof top on, mutual compare at most excellent's 40 degrees tilt angle, whole year's energy catch obtain efficiency only only lose lose about 2.5% to 4%.

For this 3% power generation amount, lose exhaust and go fix make tilt angle adjust section branch frame, material and construction fee use will increase add per watt 0.25 US dollars to 0.40 US dollars' open spend, facing a 8 kilowatt system come say extra branch out 2000 to 3200 US dollars, far far exceed did system 25 years life span period inside many send out's electric amount what can exchange back's 800 US dollars electric fee receive benefit.

Look season

The sun's high degree angle at the north half of the ball summer arrives day reaches most high 73.5 degrees, winter arrives day drops to most low's 26.5 degrees, leading cause 6 months' single month power generation amount normal often is 12 months' produce out's 2 times to 2.5 times. One piece area 1.9 square meters' 500-watt photovoltaic panel, at 7-month average, every day can output 2.8 degrees of electricity, arrive did 1 month every day's output sudden drop to 1.1 degrees of electricity.

When the accumulated snow thickness exceeds 0.5 inches (about 1.27 centimeters) and completely covers the photovoltaic glass surface, the penetration rate drops to 0%, at this time, a single piece panel's voltage output changes to 0 volts. Tilt slant degree reaches 30 degrees to 35 degrees' no frame panel, at gas temperature return rise to zero up 2 degrees Celsius to 5 degrees Celsius time, accumulate snow at 24 hours to 48 hours inside rely depend heavy force natural slide drop recover 75% above's power generation nature ability.

Regulations

Ask Ask Property Business

The whole America has 53% to 60% single-building villa places in business master committee's manage manage jurisdiction area inside, submit sun energy outside look design grass picture needs to pay insert 75 US dollars to 150 US dollars' single time build structure examine investigate fee.

Based on California state law code number 714 article's sun energy right benefit law case rule set, business master committee no right pass 100% forbid stop install's decide discussion, but can match law require take photovoltaic array flat shift to from street way water level sight line towards up look up angle 15 degrees inside not can see's roof top back face area.

This kind of did satisfy street way visual sense one exact nature and take panel from direct south direction force control change to direct north direction's physical position shift, will make one set 8 kilowatts system's head year produce electricity amount from 12500 kilowatt hours sudden drop 45% to 6875 kilowatt hours.

Live household take complete whole's specification parameter contain include panel surface reverse light rate lower than 5%'s prove document hit package submit hand over after, wait wait direct board meet seal stamp let go's standard public show cycle average at 30 days to 45 days between.

If you do not obtain that 1 portion book face approve permit letter's emotion condition under excel self carry out roof top hit hole construction, manage manage place open out's head sheet violate rule punish bill gold amount normal often set fix at 250 US dollars to 500 US dollars' base standard interval, and match take limit time period 14 days inside tear remove all 30 pieces panel's force control book face order command.

Handle construction permit

Install undertake wrap merchant must towards local ground city level or county level build structure safe whole bureau hand cross one portion thick reach 15 pages to 20 pages' apply request document package, inside contain alternating current direct current electric gas single thread picture as well as bear weight carry load exceed per square foot 3 pounds' structure structure engineer number word calculate count book.

Merge combine handle manage build structure construction and electric gas change build two sheets allow permit certificate's administration rule class collect fee standard, at whole America row name front 100's big city meet area normal often maintain hold at project whole body equipment hard cost's 1.5% to 2.5% between, change calculate for absolute gold amount about at 450 US dollars to 850 US dollars float move.

This route administration examine approve procedure's consume time square difference extreme big, connect enter did self move transform examine check system's 35 pieces try point county cities, computer brain can at 15 minutes inside adjust fetch 1,000 strips code complete complete parameter mutual pair and send put out electric sub version allow permit document.

Still rely on earth wood engineer one by one page check pair 36 inches multiply 24 inches solid body blue picture's tradition city suburb government handle matter place, its average row team wait wait's day calendar cycle by big margin pull long to 21 days to 65 days not equal.

Allow permit certificate self sign send out's day from 180 days inside if no have apply request number 1 time field scene physical check test, document make waste after heavy new sharp active's administration slow delay gold according to original fee use's 50% match ratio collect take, single time increase add 225 US dollars to 425 US dollars' extra outside finance task budget.

Leave fire prevention route

The United States National Fire Prevention Association raised the 2021 version of the International Fire Prevention Rule Specification, which brought one strip force control parameter, requiring can use area occupy land reaches 1,000 square feet's single household residence roof top, must at most high place's roof spine and panel edge border between leave empty 36 inches (about 0.91 meters) wide's fire prevent member no barrier obstacle row smoke physical step route.

Needle towards tilt slant degree exceeds 14.04 degrees (change calculate for build structure match ratio about 3/12)'s standard asphalt tile slant roof top, along follow two sides roof eaves' drop vertical thread towards inside same pattern need cut out wide degree for 24 inches (0.6 meters) to 36 inches' retreat shrink buffer punch area.

This piece needle towards fire disaster save help's physical cut leave point mark, pick remove did roof top total throw shadow area 18% to 26%'s effective cross use install space.

One piece original text long wide physical foot inch can row down 32 pieces 400 watts photovoltaic group parts' roof top, receive limit at this 36 inches' red thread retreat shrink distance require, most final fit rule's install number amount up limit by press shrink cut break to 24 pieces to 26 pieces.

Panel array four circle outside wall on's direct current electric cut leave cut road device outside shell surface, must use stick match strong degree exceed per square inch 50 pounds' industry business glue water, stretch paste red bottom white word, English letter high degree not lower than 0.375 inches' night light reverse light warn report parameter standard sign.

One morning field scene install position deviate difference exceed 2 inches lead cause fire prevent safe whole real earth check test not fit grid, heavy new at system inside pre-book supervise look member up door return check's wait wait time for 10 days to 14 days, and need right field brush card fill cross 150 US dollars' number 2 time return check fee.

Enter public electric grid

Public use matter electric power hold break enterprise towards family unit install machine capacity step cross 10 kilowatts door limit's reverse direction feed electricity project, force control collect take 200 US dollars to 450 US dollars interval's single time mutual connect project electric grid dash hit force data number research fee.

Local ground match electric grid towards single set 100 kilo volts ampere pillar on change pressure device's total photovoltaic connect enter capacity limit control at rated fixed bear load's 15% safe whole hundred divide ratio threshold value inside.

When this set change pressure device down hang carry's neighbor live photovoltaic system reverse direction input current total sum exceeds 15 kilo volts ampere's hard nature power rate up limit, row at most back 1 position's number 6 name new use household submit hand over's combine grid apply request package will be by computer brain system at 24 hours inside self move press return back deal manage.

Touch trigger this strip capacity up limit's live household if want need continue install equipment, must whole full amount bear carry take society district local part change pressure device from 100 kilo volts ampere upgrade to 150 kilo volts ampere's hard piece reach artificial cost, this portion divide spread account single's price interval high reach 3500 US dollars to 5500 US dollars.

After taking the electric grid mutual connect aid discussion, 2 names public use matter company's hold certificate electric worker up door change replace double direction wise ability electric meter, physical construction period space need pull break people house 120 volts supply electricity total gate about 2 hours to 3.5 hours.

New change on's double direction electric meter core piece with 15 minutes for one piece data number hit package collect pick frequency rate cycle, 24 hours not gap break remember record flow enter family unit and flow out electric grid's kilo watt hour essence exact electric amount read number, calculate measure essence exact degree mistake difference range by strict exact control control at direct negative 0.2% inside.

Calculate calculate total help money

Finance task parameter class strict	Number amount and hundred divide ratio	Pre-calculate gold amount and price grid	Cycle and frequency rate	Invest return report rate and receive benefit
Federal union tax collect resist free policy	Project total cost's 30%	7500 US dollars to 9000 US dollars	2032 year 12 month 31 day arrive period	Drop low 30%'s clean hard piece cost
State level place obtain tax return tax	Resist deduct limit amount up limit 15%	Most high seal top 1000 US dollars cash gold	Next year 4 month 15 day report tax single time apply report	Shrink short 0.5 years to 0.8 years return root cycle
Sun energy can again live prove book	1,000 degrees electricity=1 piece trust use score	Single sheet real goods price 380 US dollars to 420 US dollars	Every year release 10 times to 12 times	Every year increase add 3800 US dollars cover move flow water
Clean calculate measure electricity price return buy	Out mouth electricity price cut subtract 75% to 80%	Per degree electricity return buy price drop to 0.05 US dollars	Every month, an account single knot calculates 1 time	Pull long photovoltaic invest return receive period 2.5 years
Electric pool store energy attach add total help	Store energy capacity exceeds 3 kilo watt hours	Per kilo watt hour total help 150 US dollars to 200 US dollars	Single time send release total amount not exceed 2500 US dollars	Electric pool hard piece invest return report rate lift rise 18%

United States federal union tax law number 25 article rule set's invest tax collect resist free policy at 2032 year 12 month 31 day's cut stop sun period front, for buy buy hard piece equipment's pay tax person provide project send ticket total gold amount 30%'s personal obtain tax 1 time nature subtract free.

One portion most final install combine together build price number word fix grid at 28000 US dollars' 8 kilowatts rule grid system, at next year 4 month 15 day submit hand over tax table time, can produce out 8400 US dollars' absolute tax amount resist deduct number word.

Part split local ground state government tax matter bureau at this base bottom on extra outside fold plus most high 15%'s state level place obtain tax resist free match ratio, hard nature rule set absolute gold amount most high seal top at 1000 US dollars.

This two pen total calculate 9400 US dollars' tax matter subtract free account face number word, take front period hard piece material object and artificial branch out's 100% pre-calculate clean cost match ratio, towards down press low arrive did 66.4%.

At the sun, energy can again be a living ability source prove book's real goods cross trade finance blend market middle, reverse change device every produce out 1,000 degrees electricity's physical flow amount, state government unify count system just will self move produce form 1 piece trust use accumulate divide.

Washington special district due to setup law force control require public use matter company buy buy these limit amount match ratio, lead cause local ground's real goods hit sell single sheet price grid high reach 380 US dollars to 420 US dollars.

One set year average power generation amount at 10,000 degrees left right's equipment, every year fix dead produce out 10 pieces trust use accumulate divide, continuous 10 years every year for you bring come 3800 US dollars to 4200 US dollars' extra outside cash gold flow water account eye.

California state public use matter committee throw ticket pass cross's clean calculate measure electricity price 3.0 law case, take electric grid return buy family unit extra excess photovoltaic electric power's single price, from per degree electricity 0.25 US dollars' zero sell average price cut subtract to 0.05 US dollars' batch send price, calculate price single bit drop broad degree reaches 80%.