Photovoltaic and Battery Primer

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Presentation transcript:

Photovoltaic and Battery Primer An Introduction

Putting Photovoltaic Technology to Practical Use Some key vocab to discuss first: Voltage (volts) (V) Current (amperage) (I) Power (Watts) (P) P = IV more info: http://www.youtube.com/watch?v=ZSviOnud7uY

Increasing Voltage Series Wiring: Connecting individual cells together ( + to -) into a string. The voltage of each individual cell accumulates when they are connected in this way

Increasing Current Parallel Wiring Connecting PV series together (“+ to +” and “- to-”) into parallel The current (amperage) of each individual series accumulates when wired in this way.

Power (Watts) The power output is a function of both voltage and amperage and is calculated by multiplying the values together. If you are not measuring one complete circuit, you will be calculated theoretical max power output. 12V x 3A = 36 W Theoretical Max Power Notice that 12 volts are achieved by a series of two 6V modules Notice that 3 amps are achieved by two 1.5A series in parallel

Solar Cells vs. Modules A solar module is a PV device with multiple PV cells connected electrically (either in series or series and parallel). PV Cell PV Module

Modules vs. Arrays A PV array consists of multiple modules connected electrically (either in series or series and parallel) PV Array PV Module

DC to AC Inverters PV cells, modules, and arrays produce DC (direct current) electricity In the US, the electrical grid and most household appliances are equipped to handle AC (alternating current) electricity. (http://www.youtube.com/watch?v=xyQfrzBfnDU for more info.) To solve this problem, inverters are installed to convert from DC to AC.

Power vs. Energy In this context, power refers to the instantaneous output of a solar module or array. (W or kW) Energy is the ability to supply power over time. (Wh or kWh). Calculated by multiplying the power by the time for which the power is supplied

Power vs. Energy Power: Energy: Determines whether the source of energy is strong enough to “power” certain devices or homes Energy: The ability to sustain certain amounts of power over time

Power vs. Energy in Solar Arrays A typical solar panel is rated at 200W Is this power or energy? In W WA, we average 5 hours of peak sunlight each day (more in summer, less in winter) How could you determine the average daily energy value provided by a single panel? Solar panels can easily be scaled-up to provide both the power and energy needed to replace fossil fuels Why do they still pose a problem for us?