STRUDWICK.FAMILY wrote: > Barry > > I will jump in if I may, sorry Ron if I am stealing your thunder, > inverters from 12 volts to mains voltage have to use a devise called a > step up transformer. These devices need to be fed with an alternating > current(ac) at a frequency of 50 cycles per second. This is the same > frequency as the mains and can be used power your TV and other > equipment. The problem is how to make this ac from the direct current > of your battery. Your house hold supply this is a nice sine wave with > no jaggedy bits on it. The way the ac is made in most inverters is to > produce square waves and put these together to produce a "sort of > sine wave" which is full of jaggedy bits. These unwanted bits can > cause problems depending on the design and type of equipment you are > using. The more you pay for the inverter in the first place the > nearer the output wave form is to that of the house hold mains supply. >
Well said Paul. In my view the best solution is always buy TVs that are designed to run on a 12V car/caravan/lorry/boat supply. A source I have used in the past has been http://www.roadpro.co.uk. Our current boat TV is just great - good colour, very stable picture and it will usually work down to about 10 voles or so - then you start getting some noise on audio when the picture is bright (time to change batteries). I will change it in a couple of years as it's analogue only and analogue transmissions start being switched off *next year* (but not where the boat is!) Ron Jones Process Safety & Development Specialist Don't repeat history, unreported chemical lab/plant near misses at http://www.crhf.org.uk Only two things are certain: The universe and human stupidity; and I'm not certain about the universe. ~ Albert Einstein.
