Solar Energy For Homes: Solar Electric VS. Solar Thermal

Both solar photovoltaic and solar thermal harness the energy from the sun to generate clean energy.  Solar PV is used to generate electricity while as solar thermal heating is used to replace the usage of gas for hot water.  Similar traits of these systems are that they both are either mounted on the roof or on the ground and have similar physical appearance.

Using three feet by five feet panels and a plumbing collector, the solar thermal array will generate heat for hot water.  Solar thermal systems appear to be a closed-loop system where a liquid called glycol circulates through the collector.  As the sun’s radiation hits the solar thermal panel, which is serving as an absorber, the glycol circulates and is converted to heat.The insulated layer of absorber is used to ensure the heat is preserved. The tube-like appearance of the absorber tube is made from glass which is meant to last and prevent degradation.

Solar PV or solar electric panels is a collection of silicon wafer cells that is used to conduct electricity. A tough tempered glass layer is placed on to protect these wafer cells from weather damage.  The array of solar electric panels will be connected to the inverter and then connected to the utility grid.

After a solar electric system is installed, a home would not need to draw electricity from their local utility company.  The electricity used from an outlet for the refrigerator, computer, television, and electronic appliances can all be sourced by the solar power system. Extra energy that is generated during the day will be credited by the utility company and kept for future use such as during night time.  Battery backup is not necessary in a grid connected home as battery is expensive and the chance of using it is very minimal.

With current available rebates from the utility companies and tax credit from the federal government, solar electric has become more affordable than ever.   A typical home photovoltaic system will break even on cash flow in 7-10 years while each solar system lasts 25 years or more.  A typical solar thermal system will break even on cash flow in 4-6years.

Today, homeowners go solar for different reasons, solar can serve as a financial investment to save money or it can help reduce C02 and introduce clean energy for the environment.  Either of these solar option is a good way to take advantage of the available natural energy.