Sunlight is absorbed by the photovoltaic array creating direct current
(DC) electricity. The array is can be mounted to the roof or the ground.
The inverter takes the DC output and converts it to alternating current
(AC). The AC output is then usable either in the building or elsewhere
on the utility grid.
Depending on the immediate electricity needs of the home/business,
electricity can be used by electrical loads on-site
Any excess power can be fed to a battery back-up system (optional),
or to
The utility grid, in a process called 'net metering'.
In this case, the utility grid acts as a bank - the power you deposit
can be withdrawn from the grid later on, when your PV system is not
producing enough power to meet your household's energy needs (in the
winter, for instance).
Photovoltaic Cell: A device that produces electricity
from light. Cells are the building block for modules.
Photovoltaic Module: A number of PV cells connected
together,sealed with an encapsulant, and having a standard size and output
power; the smallest building block of the power generating part of a PV
array.
Photovoltaic Array: A group of photovoltaic panels.
The County of Marin is now providing free assistance to help residents and
businesses take the first steps toward purchasing a photovoltaic system.
A couple of questions to ask yourself:
Do I receive a reasonable amount of sunshine throughout the year? Look for areas that are free from shade, not blocked by trees or buildings.
A shadow, even that of a small branch, can decrease the amount of power that is generated by your system. The County has tools to help you determine if your
site is appropriate for solar.
What are my criteria for purchasing a PV system? Your criteria will help
determine the size, orientation and placement of your system. This criteria might include:
a. Reduction in energy costs
b. Environmental benefits
c. Back-up power
d. Dependent on initial budget
e. Aesthetics
If you are interested in learning how to answer these questions
yourself, many edifying resources are available. Start with reading the
following photovoltaic guides, made available through the California
Energy Commission:
Ensures that any covenant, restriction, or condition contained
in any deed or other contractual restriction, which affects the sale or
value of real property, does not limit the installation or use of a solar
energy system.
Provides fo easements to ensure the right to receive sunlight
for any solar energy system. Please note that an easement must be in place before a request can be made to address obstacles to sunlight.
Renewable Energy Directory
Online comprehensive buyers guide and business directory to more than 17,000 renewable
energy businesses and organizations around the world. You can locate renewable
energy businesses by geographic location, by product type, by business type
and by name, or search for businesses using keywords. http://energy.sourceguides.com/index.shtml
Wind
Energy Conversion Systems
In August 2010, the County of Marin adopted an updated Wind Energy Conversion System (WECS) Ordinance. Get more information on the update and additional WECS information here.
Summary
of California Energy
This website provides energy information on generation, demand, consumption, prices and sources for California. Information available by
types of fuel, sector and county. From the CA Energy Commission.
Energy
Statistics for the United States
This website provides energy information on prices, sales, demand and consumption for all energy types (including renewables). From the U.S. DOE Energy Information Administration.
