How Does Solar Storage Benefit Society | Energy Access, Stability, Sustainability

Energy storage can raise power stability (peak shaving valley filling can drop load 20–30%), 5–10kWh family cell can guarantee 4–8 hours of power use; combine photovoltaic can raise self-use rate to 70% above, reduce power outage impact and lower carbon exhaust.

Energy Access

Currently, about 733 million people live in areas that have no public power grid coverage, and sub-Saharan Africa accounts for 560 million. Pull a 11-kilovolt high-voltage transmission line to a remote village, every kilometer's project early stage manufacture cost needs 25 thousand to 30 thousand dollars. Build an off-grid solar energy micro grid's budget threshold needs to be much lower.

Take Kenya's 300 households' village as an example, assemble a set of 100 kilowatts' solar energy panels, add a total capacity of 400 kilowatt hours' lithium iron phosphate cell cabin, all hardware purchase cost about 180 thousand dollars around. Daytime noon 12 o'clock sunshine intensity reaches every square meter 1000 watts time, photovoltaic panel locate at full load power generation state, electric energy through maximum power point tracking (MPPT) controller store enter cell pack, overall conversion efficiency can reach 97.5%. Wait until night 7 o'clock, villagers start concentrating on using power, energy storage cabinets can discharge 50 kilowatts' power stable for 8 hours.

Take equipment 15 years life period inside's depreciation fee, every year 2.5% 's routine maintenance fee all calculate enter inside, villagers actual use power's levelized cost of energy (LCOE) can press low to every degree electricity 0.25 dollars. Compare before spending every degree of electricity 0.8 dollars to buy diesel oil to generate power, family's monthly energy total expense drops 68.7%, every household can average every month save down 12 to 15 dollars's cash.

By day, pay electricity fee

A set standard's household use small type system contains a piece 50 watts's polycrystalline silicon solar energy panel and a piece 12 volts, 20 ampere hours's gel lead acid cell, extra add 3 pieces 3 watts's LED light bulbs and 1 root multi-head mobile phone charger data line. Farmer first hand in 15 dollars down payment take whole set of hardware bring back home, then every day through mobile phone button send number code to pay 0.4 dollars's equipment unlock fee, equipment internal's internet of things communication chip receive to authorize signal after then will supply power 24 hours.

· Every day, night provides continuous 6 hours' illumination, indoor illuminance reaches 150 lux, just right to satisfy the 5 square meters room's reading book light ray demand.

· Every 2 days, give a unit 3,000 milliampere hours cell capacity's smartphone full charge one time electricity, charge current stable set at 1 ampere.

· System's depth of discharge (DOD) is strictly limited at 60%, preventing internal lead acid cells from aging too early.

· Continuous by day, pay 24 months after, total spend 303 dollars, whole set system's ownership automatically belongs to the farmer, follow up 10 years' life period inside no longer produce any extra electricity fee.

Storefront open late point

Town's small shops assemble on more big capacity energy storage cells after, every day's operation time large amplitude extend. Install a 300-watt monocrystalline silicon solar energy panel matched with a 1.5 kilowatt-hour ternary lithium cell commercial system. One time full charge electricity can store down 1500 watt hours's effective energy. The haircut store can connect to a handle rated power of 15 watts's alternating current hair clipper, every day extra open door operate 4 hours, according to every time haircut charge 1.5 dollars, average consume time 20 minutes calculate, every day storefront running water increase 18 dollars.

The grocery store boss spent 250 dollars to purchase a unit volume of 100 liters, and daily consumes electricity only 0.6 degrees's high efficient direct current frequency conversion freezer use to sell ice-cold drinks. When the energy storage cell pack's environment working temperature is maintained at 30 degrees Celsius, the cell group experiences one 90% depth charge discharge cycle every day. A bottle of ice-cold drink's retail unit price compared to normal temperature water is high out 0.2 dollars, every day stable sell out 30 bottles, a month's gross profit increases 180 dollars, usually only need 8.5 months then can completely receive back the purchase freezer and photovoltaic storage system's all initial investment amount.

Protect cold chain

Remote area's medical clinic at connect energy storage facility before, local power grid power outage frequency extremely high, average every month encounter 12.5 times accidents cut power, single time cut power average continuous time as long as 4.5 hours. Measles vaccine or polio vaccine must strictly store at 2 to 8 degrees Celsius's constant temperature medical refrigerator inside. Once the temperature exceeds the safe range, exceeding 120 minutes, the whole box of vaccine's biological activity and effective rate will then irreversibly drop to 0%.

The World Health Organization currently recommends an off-grid medical plan that gives every grassroots clinic a configure at least 5 kilowatts peak power solar energy array, and add on 20 kilowatt hours' lithium iron phosphate cell cabin. Even if it meets continuous 3 days' extreme overcast rain weather, solar energy panel every day can only output nominal power 15% of weak electricity amount, 20 degrees electricity's bottom layer reserve capacity is also completely enough to maintain two units 200 liters volume's medical freezer continuous safe operate 72 hours.

Cell management system (BMS) motherboard every second 10 times high frequency collects single body cell cell's voltage data and surface temperature data, when detects external city power input voltage lower than 180 volts or sudden higher than 250 volts, the built-in inverter will in 20 milliseconds' extremely short time automatically cut off city power connect switch, let energy storage cell seamless take over clinic inside's all electrical appliance load, final output voltage's up down fluctuate amplitude be dead dead limit at positive negative 3%'s extremely small interval inside.

Stability

California Independent System Operator (CAISO)'s power grid data curve shows, in the spring season's certain one day, noon 12 o'clock to afternoon 2 o'clock, solar energy photovoltaic array toward distribution grid inject high up to 18000 megawatts's electric energy, leading to power grid's net load sudden drop to 3000 megawatts's extremely low value. When the afternoon 5 o'clock sun drops mountain time, photovoltaic power generation amount in 120 minutes inside cliff style falls to 0 megawatts, and residents get off work and return home, open air conditioner and oven, whole grid use power total load at night 7 o'clock instant soar to 28000 megawatts. High up to 25000 megawatts's supply demand drop difference requires traditional natural gas peak shaving power plants with every minute 150 megawatts's rate force pull raise power generation power.

Assemble at transmission node's public utility grade lithium ion cell energy storage station, in daytime 4 hours's sunshine extreme value period absorb and store 20000 megawatt hours's surplus electricity amount. Night supply power gap appears time, large-scale energy storage station with stable's 4,000 megawatts output power toward 500 kilovolts's high voltage transmission grid discharge. A seat standard specification's 250 megawatts, 1000 megawatt-hour's cell facility able to will maximum rated power output accurately maintain 4.0 hours, completely cover night time's use power load peak period, prevent whole grid alternating current frequency because instant's exceed quota heavy load and fall break 59.95 hertz's lower limit threshold value.

Adjust frequency millisecond grade

The dispatch center will alternate current operation frequency strictly calibrated at 60 hertz or 50 hertz. Single time frequency deviation amplitude reach 0.2 hertz then will trigger substation relay protection device's action, mandatory cut off 30% of commercial use power load in order to preserve the main power grid. Traditional's burn coal or burn gas machines rely on mechanical valve adjust steam pressure to change generator rotor rotation speed, from receiving dispatch command to actual change output power need consume 15 to 30 seconds' time. Inverter couple's cell energy storage system (BESS) through connect grid point (POI)'s voltage transformer, every separate 10 milliseconds toward local power grid frequency proceed one time high frequency's accurate sample compare.

· When internal sample data show external frequency at 0.5 seconds inside fast slide down to 49.85 hertz time, lithium iron phosphate cell cluster's solid state contactor in 20 milliseconds inside rapid close, system from standby state instant switch to 100 megawatts's full load active power output mode.

· Face big wind weather leads to wind power generator power large amount surplus, whole grid frequency up float to 50.15 hertz, energy storage cabinet immediately reverse absorb 100 megawatts's active power toward internal cell cell proceed big current fast charge, prevent high voltage transmission line grid exceed its 150 degrees Celsius's highest heat limit load.

· Australia's 150 megawatts large-scale energy storage project in the grid operates 24th month, undertakes this state 35% of frequency control ancillary service (FCAS) total work amount, will every megawatt hour FCAS's settle unit price from 15.0 Australian dollars strong force beat press to 1.5 Australian dollars.

· Execute daytime adjust frequency task's cell unit, its state of charge (SOC) be background control system mandatory lock at 40% to 60%'s narrow interval, guarantee it in any 1 second inside all possess two way equal capacity's charge discharge throughput ability.

Support high voltage value

A strip rated voltage is 230 kilovolts's transmission trunk line, in the heavy industry park area's receive power end time, voltage number value possible drop fall 8%, fall drop to 211 kilovolts. Connect large-scale photovoltaic panel and cell station's smart inverter possess four quadrant adjust function, in completely not consume cell internal store chemical energy's premise, toward substation busbar continuous inject reactive current.

A unit rated apparent power is 50 megavolt amperes (MVA), and the energy storage inverter toward the outside transmits 40 megawatts active power, while able to synchronous toward the public power grid output 30 megavolt amperes reactive (MVAR) reactive power. Equipment internal's control logic every 100 milliseconds reads one time transmission line end end voltage, will power factor at lead 0.8 to lag 0.8's parameter range inside proceed step less slide adjust. Once the main substation 5 kilometers outside the transmission iron tower happens tree touch leads to phase to phase short circuit fault, local busbar voltage will in 150 milliseconds inside sudden drop to nominal value's 50%.

Energy storage inverter in this tiny time segment inside will force output high up to self-rated current 120% short circuit fault current, continuous maintain 2.0 seconds, for upper layer circuit breaker strive enough's physical trip protect time, avoid single point short circuit evolve become involve surround 3 counties cities's region style voltage big collapse. Power grid companies utilize energy storage inverter's reactive adjust margin, exempt purchase and install 20 megavolt amperes reactive synchronous condenser or giant capacitor group's construction step, single 330 kilovolt substation's build budget therefore shrink about 3.5 million dollars.

Power outage self start

Encounter a super strong hurricane destroying a cross-state ultra-high voltage transmission corridor after, large areas' transmission distribution power network present total blackout power state. Restart a seat installed capacity is 500 megawatts's combined cycle natural gas power plant, single single start gas turbine's hydraulic main bearing, smooth oil pump and cycle cool water system, then need 15 to 25 megawatts's initial electric power support. Past power plant high degree rely on 5 megawatts's standby diesel generator execute "black start" ignite fire procedure, diesel machine from spray oil ignite fire to voltage and phase synchronous often consume time 15 to 20 minutes. Grid-forming inverter matches big capacity energy storage cells through replacing old old diesel engine's start role.

· Receive to dispatch center's black start number string command after, energy storage control motherboard in 0.5 seconds inside utilize internal's high frequency oscillate circuit, out of thin air build up strictly align 60 hertz, 13.8 kilovolts's reference standard alternating current voltage source.

· Cell group with 20 megawatts's constant active power toward gas power plant's assist electrical appliance equipment supply power, in gas turbine as long as 12 minutes's ignite fire pull raise rotate speed process middle, will whole station voltage's instant fluctuate amplitude dead dead limit at nominal value's positive negative 2% within.

· At the city distribution power grid, most ends, a piece of configure 2 megawatts of roof solar energy photovoltaic and 4 megawatt hours of lithium cell cabin's medical center, its dual power supply automatic transfer switch (ATS) in city power voltage return zero's 16 milliseconds inside, cut off with external paralyze power grid's physical connect.

· The medical center entered island independent operation mode after, and the energy storage system with an extremely high frequency dynamic track building internal 1.2 megawatts's use power load. When thick heavy cloud layer blocks photovoltaic panels, it leads to solar energy output power in 10 seconds inside from 1.5 megawatts to 0.3 megawatts, bottom layer cell group discharge power in 20 milliseconds inside from 0 megawatts fierce increase to 0.9 megawatts, intensive care unit life maintain equipment interface end's supply power voltage wave form start end maintain at 120 volts's smooth sine wave, period completely not have appear even if 1 microsecond's current interrupt.

Sustainability

Burn gas peak shaving power plant in single time starts head 30 minutes inside, due to burn room temperature not reach 900 degrees Celsius's extremely excellent working standard, natural gas's not complete burn will lead to carbon monoxide and not fully burn's methane large amount exhaust enter atmosphere layer. A 50 megawatt gas turbine unit with 35% heat efficiency full load operates one hour, usually emits about 24.5 tons of carbon dioxide and 18 kilograms of nitrogen oxides.

Solar energy energy storage power station completely exempt from burning fossil fuels' physical process. When a land occupies 2 acres, the installed capacity is 100 megawatts/400 megawatt hours's lithium iron phosphate cell matrix in the afternoon from 5 o'clock to night 9 o'clock full load discharge time, toward the local alternating current distribution grid, transmit 400 megawatt hours's pure electric energy. According to every produce one degree natural gas electricity exhaust 0.45 kilograms carbon dioxide's parameter convert, single time complete's 4 hours discharge cycle, equal to for atmosphere layer reduce 180 tons carbon dioxide exhaust.

The power station control center will cell cabin's internal working environment humidity constant at 55%, and in a 15-year contract life period, inside, mandatory set every year finish 350 times depth reach 90% charge discharge cycle. A set of 100 megawatt hours's public utility grade photovoltaic storage equipment in 180 months's continuous operate cycle inside, cumulative can stop near 94 thousand tons of greenhouse gas float enter stratosphere, equivalent to from California state's highway on permanent remove 38 thousand vehicles displacement is 2.0 liters's traditional burn oil car.

According to California Air Resources Board's 2022 year's exhaust list statistic data model, if at the public supply power network's end end substation nearby, large scale deploy discharge time length exceeds 4 hours's large scale cell group, able to in use power night peak period segment take burn gas peak shaving power plant's start frequency force press low 65%, whole state electric power department every year's carbon dioxide equivalent reduce exhaust rate will stable break through 7.5%.

Old cell work part-time

Electric vehicle's motive power cell pack in use 6 to 8 years after, internal available state of health (SOH) once falls below 80% of rated standard, charge discharge time's internal resistance will up float 15% to 20%, leading to vehicle endurance navigate mileage appear obvious shrink water. Eliminate down come's motive power cell cell although unable to satisfy car urgent accelerate time need instant output of 300 amperes big current's harsh physical requirements, but internal still remain have huge's chemical energy store space.

Engineering personnel will thousands upon tens of thousands retire's nickel cobalt manganese ternary lithium cell cell all transport toward special use's detect workshop, through inject 0.1C's tiny charge discharge test current, consume time 24 hours to accurately measure every single body cell cell's true remaining capacity and alternating current internal resistance value. Conform screen standard's retire cell cell be re assemble become 48 volts, 50 ampere hours's standard static energy storage module, large scale place at to volume weight not a bit sensitive's commercial building basement or desert photovoltaic panel down direct.

A unit by retire cell cell piece together assemble and becomes 2 megawatt hours industry commerce energy storage cabinet, in every day execute peak valley electricity price arbitrage task time, charge discharge multiplier be cell management system (BMS) strictly limit at 0.25C's low voltage slow speed interval. Slow's ion migration speed extremely big degree delay cell cell internal solid electrolyte interphase (SEI) film's increase thick speed.

Bloomberg New Energy Finance's industry measure calculate report shows, take retire motive power cell re deploy to photovoltaic fixed energy storage field, able to let single body cell cell's physical serve age from 8 years extend to 15 years above, whole strip industry chain in manufacture stage place produce's early period carbon footprint be huge's late period power generation amount share out 40%, every megawatt hour energy storage system's hardware purchase cost even is from current's 130 dollars drop to 75 dollars below.

Extract metal

When the fixed energy storage system's physical life breaks through 15 years, and the internal cell's state of health through fall breaks 50% of the absolute scrap red line after, the cell cabin will be whole transport toward professional's wet method metallurgy recycle factory proceed material purification. Mechanical crush machine first will cell pack through beat break become diameter less than 2 millimeters's black color powder substance.

Operate personnel will powder pour enter temperature high up to 85 degrees Celsius, concentration is 0.5 moles per liter's dilute sulfuric acid solution, match add enter hydrogen peroxide as a chemical reducing agent, continuous stir react 120 minutes. Precipitate separate working procedure able to take cell cell inside 98.5%'s metal cobalt, 97.2%'s metal nickel and 95% above's lithium carbonate extract out come. Produce out's cell grade lithium carbonate powder purity is high up to 99.95%, each item's physical parameter and from natural salt lake brine water middle extract out come's original grow lithium carbonate not a bit difference, completely conform to second time manufacture brand new energy storage cell cell's raw material purchase specification.

Adopt wet method recycle craft process one ton waste old lithium ion cell, whole chemical flow process only needs consume 150 degrees industrial use electricity and 2.5 tons of cycle cool water. Every success extract out comes one ton of high purity regenerated lithium carbonate, compared to the original ore stone, can save about 450 cubic meters's underground fresh water resource, and take mine area soil heavy metal pollute's happen probability toward down press low 99.2%.

European Environment Agency's product life cycle track literature confirms, when the solar energy energy storage industry chain realizes 90% above's scrap cell recycle purify rate after, global newly added energy storage power stations to natural lithium ore stone's rely degree will appear in 2035 before 45%'s cliff style down slide, from physical source head large amplitude reduce new energy equipment manufacture to fragile ecology area's destroy behavior.