Photovoltaic System Fundamentals. PV Workshop Agenda Friday – 9 Intro to PV – 10 Site Assessment – 11 PV Cells, Modules & Arrays – 12 Lunch – 1 Photovoltaic.

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Presentation transcript:

Photovoltaic System Fundamentals

PV Workshop Agenda Friday – 9 Intro to PV – 10 Site Assessment – 11 PV Cells, Modules & Arrays – 12 Lunch – 1 Photovoltaic Panel Mounting – 2 Combiner Boxes & Disconnects – 3 Inverter Technology Saturday – 9 Batteries – 10 Charge Controllers – 11 Power Systems – 12 Economics

Advantages of Photovoltaics Modular and easily scalable No moving parts Reliable, proven technology Durable (last more than 50 years) Long Warranties Price Continues to Decrease No Operational Pollution Solar Energy is available everywhere & free Varied Applications

Disadvantages Cost ????? - approximately $.20/kwh without incentives; about $.09/kwh with incentives in NC (assuming $4/watt and 65% tax credit) Low efficiency compared with solar thermal Require a lot of surface area Lack of experience and knowledge

World Cumulative Capacity 2013 (MW)

2013 Annual PV Installations (MW)

Factors Influencing Growth Falling Prices Strong Consumer Demand Available Financing Public Policies – Feed in Tariffs (FITs) – Renewable Portfolio Standards (RPS) – Rebates – Tax Credits

World Cumulative Installed Capacity (GW) of Wind & PV Source: Vital Signs. Worldwatch Institute, 2013

Leading PV Adopter Countries in 2013

Cumulative PV in 2013 by Country (MW & %)

PV Growth Trends World installed capacity grew by 39% in 2013 (36.9 GW) 1% of world’s electricity (some countries are producing as much a 8%) Annual worldwide growth has averaged 50% per year over last 5 years > 140,000 MW in 2014 China (11.3 GW), Japan (6.9 GW), US (4.75 GW) Germany(3.3 GW) & Italy (1.5 GW) are leading adopters in 2013 $140.4 billion invested in 2012 Over past 10 years world PV capacity grew from 10 GW to 140,000 GW

Percent of Electricity From PV

US Cumulative PV Installed Capacity (MW) Source: US Solar Market Trends 2012, IREC, July 2013

PV Installation by State, 2013

Source: US Solar Market Trends 2012, IREC, July 2013 Number and Type of Annual US PV Installations

Annual US PV Installations by Year and Type (MW) Source: US Solar Market Trends 2012, IREC, July 2013

Largest US PV Installations Source: US Solar Market Trends 2012, IREC, July 2013

Apple NC 20 MW – 100 acre Solar Farm

US Residential Grid- tied

US Non-Residential Grid-tied

Photovoltaic History 1839 Edmund Becquerel - first recognized the effect

Early PV milestones 1839 – discovery of the photovoltaic effect; 1873 – Willoughby Smith discovers the photoconductivity of selenium 1883 – Charles Fritts develops first selenium cell (1% efficient) 1904 – Einstein published his paper on the photoelectric effect (along with a paper on his theory of relativity) 1921 – Albert Einstein wins the Nobel Prize for his theories (1904 paper) explaining the photoelectric effect

P-N Junction & 1st cells Russel Ohl – worked at Bell Labs in 1930’s & 1940’s Discovered the P-N junction in 1939 Patented 1 st modern solar cell called a “Light sensitive device”

THE DREAM BECOMES REAL  Gerald Pearson, Daryl Chapin, and Calvin Fuller of Bell Labs were the principle discoverers of the silicon solar cell called a “solar battery”  Dopants used to produce 6% efficient cells

Silicon Makes up ¼ of earth’s crust; 8 th most common element in universe; 2 nd most common (25%) on earth after oxygen Sand Amethyst Granite Quartz Flint Opal Asbestos Clay

Silicon

Silicon Ingot

PV cells

Photovoltaic Effect

Searching for Applications Novelty items such as toys and radios run by solar cells were First

Late 1950s - Saved by the Space Race The late Dr. Hans Ziegler, the chief advocate for powering satellites with silicon solar cells

Vanguard I - first PV powered satellite Launched in 1958; 4 th artificial satellite solar panel: 0.1W, 100 cm² Vanguard's solar cells operated for about seven years, while conventional batteries used to power another transmitter on board Vanguard lasted only 20 days. Still orbiting; longest orbiting artificial satellite $1000/watt

Early 1970s - The First Mass Earth Market Solar cells power navigation warning lights and horns on most off-shore gas and oil rigs throughout the world

1970s - Captain Lomer's Saga Lighthouses

Working on the Railroad The first solar-powered crossing depicted in this picture began operating at Rex, Georgia in 1974 for the Southern Railway (now the Norfolk/Southern)

Late 1970s - Long Distance for Everyone One of Telecom Australia's (now Telstra) many solar-powered microwave repeaters, whose installation began in the late 1970s, to provide Australians living in remote areas with high-quality telecommunication service

1970s - Father Verspieren Preaches the Solar Gospel Water pumping for people and livestock in developing world

1980s - Electrifying the Unelectrified A common sight in French Polynesia: solar modules on thatched roofs

Current PV Applications Residential/commercial grid-direct systems Utility scale “solar farm” electricity production Telecommunications Water Pumping Off-grid (stand-alone) Satellites and space stations Battery charging in myriad applications

Types of Systems 1. DC direct 2. Battery charging 3. Hybrid systems 4. Grid-direct 5. Grid-tied with battery backup

DC-Direct System PV Array – DC energy production DC-Direct Load *Simple, Reliable *No Sun, No Energy *PV produces DC power *Load requires DC power *Array and Load matched in power (watts)

Direct PV Systems

Direct PV System

Battery-Charging System (DC only) DC Load(s) Batteries - DC Energy Storage Charge Controller PV Array – DC Energy Production *Loads operate at night or in cloudy weather *Battery bank can supply large surge currents *Charge controller keeps battery from overcharging

Off-Grid System with AC loads DC Load(s) Batteries - DC Energy Storage Charge Controller PV Array – DC Energy Production Inverter/Charger AC Load(s)

PV array Combiner Box Battery Charge Controller Inverter DC Junction Box

Hybrid (Off-Grid) Systems

Grid-Direct

 ”Utility intertie”, “Grid-tie” or “Utility-interactive”  No batteries or charge controller. Utility grid acts as power reserve.  Inverter automatically shuts down with utility failure.  PURPA: Utilities pay “avoided costs” for PV power generated and “sold” to the grid.  Buy all/sell all – different rates  Net metering- meter spins backwards and forwards

Direct Grid Tie System

Residential/Commercial Grid-Direct

Utility Scale Solar Farms

*Will operate when grid fails. *Provides back up power to “essential loads.” *More expensive. Grid-Tied with Battery Backup

Grid Tie with Battery Backup