Solar Modules

A photovoltaic module is composed of solar cells; a transparent glass or similar top cover; thin sheets of vinyl acetate to hold the top, bottom, and solar cells; a bottom layer of thin polymer to prevent water and gases seeping in; and an aluminum frame to hold all of the layers in place.

Energy performance ratings for solar modules are measured in peak watt (the maximum power of a module under laboratory conditions, which are not real world conditions), normal operating cell temperatures (a lower watt, more realistic value), and AMPM standard (measures the module performance during an entire day, and not just the hours of greatest sun).

It’s important to get the correct size photovoltaic system for your property to ensure you are able to generate enough electricity to meet your needs. This is especially critical if you plan to be off the grid, and must create all of your electricity. But it should be relatively easy to add additional panels if necessary to increase the amount of power supplied.

Decide how much of your electric bill you want to supplement with solar energy. That will determine how large a system you’ll need. Go over past electric bills to find your total electrical usage. You might find additional ways to conserve electricity, further reducing your bills.

First, consider what portion of your current electricity needs you would like your PV system to meet. For example, suppose that you would like to meet a certain percentage of your electricity needs with your PV system. You could work with your PV provider to examine past electric bills and determine the size of the PV system needed to achieve that goal. You can contact your utility company and request the total electricity usage, measured in kilowatt-hours (kWh), for your household or business over the past 12 months or consult your electric bills if you save them.