ABR, GRI / REALTOR®, Realtor Green
A Realtor Green, Specializing in Buyer Brokerage and Single Seller Agency Representation.
Green Building and Sustainable Building Consulting.

home | e-mail 

65 Bellevue Ave.
Rhode Island 02840



Available Renewable
Energy Systems From

Renewable energy can be collected from direct sunlight, using photovoltiac (PV) modules, from 9 mph or higher winds, using wind turbines; or from falling water, using hydro turbines.

PV collection is by far the most common method in use today — it's the easiest to install, requires the least amount of maintenance, and appears to be the most long-lived. In remote locations, batteries are used with PV modules to store the collected energy for later use. In less remote areas, excess energy can be delivered to the utility grid, often turning your meter backwards. Our examples below use PV modules, but the energy could just as well be delivered in whole or in part by wind or hydro in the right location.

Hybrid PV-generator or Utility Interie System

Utility Intertie System

There are two common uses for utility interie. The first and most common use is when normal utility power is unreliable in your locale, and the homeowner needs a reliable power supply for some or all household appliances. Computer users are familiar with this system as a UPS, or uninterruptible power supply—we just scale it up as needed. This is most common in third-world nations and now in California, where storage batteries are used to provide dependable power. Charging can come from a renewable energy source, the utility, a generator, or all of the above.

The second type of utility interie allows the homeowner to sell any renewable energy, beyond what the household needs at the moment, back to the utility company. This scheme doesn't always need storage batteries, but often uses hem to provide emergency backup. This is the system used at our 12-acre Solar Living Center in Hopland, California. These systems require specialized low-distortion inverters to produce acceptable energy for distribution.

Solar Electric Systems
Solar Direct System

The solar array direct system is the simplest solar energy system. It consists of an appropriately sized solar array powering an electrical appliance directly without the use of batteries. Examples of this would be solar-powered fans and water pumps. This system offers simplicity and high operation efficiencies but won't run an appliance under heavy cloud cover or at night. Performance is enhanced with the addition of current boosters: electronic devices that permit motors to start or run under low light conditions.

Small Stand-Alone Solar System

A stand-alone system depends entirely on (a) renewable energy source(s). It can provide power for lighting and entertainment in a remote cabin, RV or boat. The size of the PV array and battery depend on individual requirements or, more commonly, the individual pocketbook. We can often suggest more-efficient appliances to reduce the overall cost of your system. Many systems can start small with room to grow in the future.

The PV array will charge the battery during sunny hours, the battery supplies energy directly to DC loads, and through the inverter, to AC loads as needed. The charge controller prevents overcharging when the battery is full.

Small Stand-Alone Solar System




©2003-2011 Fred Dallinger / Natural Tech Homes. All Rights Reserved.