Posted by LJD on October 07, 2012 at 15:30:15 from (75.213.81.16):
While we're sort of on the topic of RVs, DC to AC, AD to DC, etc. - I've got a comment and a question to anyone that knows.
The general topic is the difficulty of making microwave ovens work properly when run off an inverter. One problem is the Root-Mean-Square thing (RMS voltage). It is used to give voltage "equivalents" so a person can figure what will run what off an inverter. For example - a cheap modified wave inverter will often only read 95 volts at the AC output with a common voltmeter, but will read 120 volts AC when checked with an RMS capable voltmeter. RMS voltage works OK with resistance-element heat makers, e.g. toaster, electric ovens, etc. It does not work however with microwave ovens.
So, to make a long-story shorter. Most microwaves will barely work off a mod-wave inverter when that inverter has 14 volts at the DC input. That cannot happen when only running off batteries. Thus the reason why the microwaves in RVs often work MUCH better if you start the engine (or genny) and make battery voltage rise from 12.7 volts to 14 something volts. With a fully charged battery bank - at 12.7 (or around) volts - a microwave is lucky to work at 1/2 its rated output, if that. And often, battery voltage with such a draw will drop to 11.5 or 12 volts which can render the microwave near useless.
Now -about conventional microwaves. None have variable power. The way they work is - at full current draw but slamming "on" and "off" like machine guns. That's why a small 700 watt microwave often draws 14 amps of AC current in repeated surges. That "700 watts" only refers to cooking power - not AC power draw.
Now - Panasonic has a new tech microwave called the "Inverter Microwave." Note the word "inverter" here has nothing to do with the inverter we use to make AC power from a DC source. This new microwave actually has steady linear power that can be trimmed down at a lower power setting. I'm not sure how it all actually works but I just ordered one. I'm anxious to see how it performs.
We sell tractor parts! We have the parts you need to repair your tractor - the right parts. Our low prices and years of research make us your best choice when you need parts. Shop Online Today. [ About Us ]
Today's Featured Article - History of the Nuffield Tractor - by Anthony West. The Nuffield tractor story started in early 1945. The British government still reeling from the effects of the war on the economy, approached the Nuffield organization to see if they would design and build an "ALL NEW" British built wheeled tractor, suitable for both British and world farming.
... [Read Article]
Latest Ad:
Oliver 550 Diesel runs like a watch three point hitch pto engine gone threw about two hundred hours ago nice clean tractor
[More Ads]
All Rights Reserved. Reproduction of any part of this website, including design and content, without written permission is strictly prohibited. Trade Marks and Trade Names contained and used in this Website are those of others, and are used in this Website in a descriptive sense to refer to the products of others. Use of this Web site constitutes acceptance of our User Agreement and Privacy Policy
TRADEMARK DISCLAIMER: Tradenames and Trademarks referred to within Yesterday's Tractor Co. products and within the Yesterday's Tractor Co. websites are the property of their respective trademark holders. None of these trademark holders are affiliated with Yesterday's Tractor Co., our products, or our website nor are we sponsored by them. John Deere and its logos are the registered trademarks of the John Deere Corporation. Agco, Agco Allis, White, Massey Ferguson and their logos are the registered trademarks of AGCO Corporation. Case, Case-IH, Farmall, International Harvester, New Holland and their logos are registered trademarks of CNH Global N.V.
