Lochsa Design can provide cost effective solutions for your Solar Electric Power System or Web site design needs.

N7ZN Home Page

Solar Power System

Amateur Radio

Telescopes

Photos

Living with Off-Grid Solar Power

About Lochsa Design

Links

Home

 

Considerations When Selecting Appliances
for Off-Grid Living:


Telephones and Answering Machines

    Your basic vanilla flavored telephone instrument gets all the power it needs from the phone company. If you want a phone with more features, a cordless phone, an answering machine or some combination of these it is worth your time to look for one which runs from a 9-12V DC power supply (the ubiquitous wall wart). Of course, you need to realize that these devices are phantom loads and must be accounted for in your overall power budget. (If your battery pack is 24V or 48V you can get a voltage regulator to convert to 12V.)

    Because the phone company grounds their positive supply voltage, and your power system grounds it's negative supply voltage, it is common to run into 'ground loop' problems when powering telephones and answering machines directly from a DC power system. If you have a ground loop you will hear a buzzing noise in your telephone or on recorded messages. It is possible to purchase a small and low-cost unit that can supply a 'floating' DC supply to your telephone and answering machine to solve this problem.

    Seriously consider signing up for your telephone company's VoiceMail service so that you will not need an answering machine.

 
 

Back to Appliance Page
Previous Page    Next Page

 
 

 
Thank you for visiting this website

Last update: 5MAY2003

Created by Lochsa Design