Posted by jdemaris on April 28, 2009 at 09:54:13 from (67.142.130.23):
I am no math wiz, and never will be.
I want a refrigerator for a small diesel Blazer mini-motorhome I'm building. Special purpose small DC refrigerators cost $1000 or more.
So, I got wondering just how much power the cheap little AC dorm-sized refrigerators use. Keep in mind that my Blazer has 3000 watts of AC power available.
The Blazer has dual deep-cycle storage batteries with a 3000 watt inverter. They provide a total of 225 amp hours at 12.5 volts.
I've tested the refrigerator for two days on 120 VAC and it is using an average of 24 WH per hour (WH being watt/hours). The actual reading I got is - in exactly 12 hours the frig used .27 KWH at 120 VAC. So, I'm figuring .27 KWH = 270 watt hours. 270 watt hours divided by 12.5 volts DC = 21.6 amp hours - correct?
So, I have a pair of deep cycle 6 volt batteries rated at 225 amp hours each. Run in series to make 12.5 volts, the total sum is still 225 amp hours.
So, they can supply 1 amp steadily for 225 hours at 12.5 volts. Also, that means they can supply 21.6 amps for 10.4 hours? Is that correct?
My problem is - every time I sit down and try to figure this out, I get a different answer - so I must me making some mistakes.
I also realize I'll have around 5-10% loss with the inverter, but forget that for now.
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 - What Price Enthusiasm? - by Anthony West. Quite frankly, for some time now restorers like myself have become more and more concerned about the rapid increase in the prices of old farm machines here in England. There is now a growing market for "As found" machines. Which as machines get rarer, has found the birth of a new industry....one of the "procurement agent". These agents appropriate as much old machinery as possible then inflate prices at auctions. So at what price enthiusiasm? We are now seeing poor machines which 3 years ago ma
... [Read Article]
Latest Ad:
For sale Farmall super A tractor is complete and has just been setting for awhile,it was running when pulled out of the barn,shouldn’t take to much to get it going asking 1100.00
[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.
