Go Back   iRV2 Forums > TRAVEL TRAILER, 5th WHEEL & TRUCK CAMPER FORUMS > Toy Haulers Discussion
Click Here to Login
Join iRV2 Today

Mission Statement: Supporting thoughtful exchange of knowledge, values and experience among RV enthusiasts.
Thread Tools Search this Thread Display Modes
Old 09-18-2010, 10:58 AM   #1
Junior Member
Join Date: Sep 2010
Posts: 2
What are the benefits to having a power inverter?

I just bought a 2007 WW fb2200. It came with 2 6v deep cycle batteries. It has a 5.5kw generator. Many camp grounds have quite hours so my question is how long will I be able to watch a 19inch (old style tube TV/dvd combo) on my batteries. Can I make a pot of coffee in the am w/o running the gen? Are there hidden cost of other things I am going to need. I found a 3000w power inverter installed for $700. Thanks for the help. As you can prob tell I am very new to this trailer camping thing.

alot2nv is offline   Reply With Quote
Join the #1 RV Forum Today - It's Totally Free!

iRV2.com RV Community - Are you about to start a new improvement on your RV or need some help with some maintenance? Do you need advice on what products to buy? Or maybe you can give others some advice? No matter where you fit in you'll find that iRV2 is a great community to join. Best of all it's totally FREE!

You are currently viewing our boards as a guest so you have limited access to our community. Please take the time to register and you will gain a lot of great new features including; the ability to participate in discussions, network with other RV owners, see fewer ads, upload photographs, create an RV blog, send private messages and so much, much more!

Old 09-18-2010, 12:35 PM   #2
Moderator Emeritus
RickO's Avatar

Join Date: Jan 2007
Location: Litchfield Park, Arizona
Posts: 10,530
Welcome to the forum! We don't do much (any) dry camping so I'm afraid I can't help with your questions but you've come to the right place. I'm sure some of our experts will chime in soon.


Rick, Nancy, Peanut & Lola our Westie Dogs & Bailey the Sheltie.

2007 Itasca Ellipse 40FD
RickO is offline   Reply With Quote
Old 09-18-2010, 02:09 PM   #3
Senior Member
wa8yxm's Avatar
Damon Owners Club
Workhorse Chassis Owner
Join Date: Mar 2009
Posts: 23,927
How long watch TV? Several hours at least.

Coffee in the AM.. Well, depends on how many hours TV.

With a 3KW inverter I would consider adding another pair of batteries... Or two pair.
Home is where I park it!
wa8yxm is offline   Reply With Quote
Old 09-18-2010, 08:26 PM   #4
Join Date: Oct 2007
Posts: 39
The answer is simple in concept but can get complex in details. The inverter takes 12 volts DC IN and "inverts" it to 120 volts AC OUT.

The key formula is simple: Watts = Volts X Amps

Therefore, Volts = Watts / Amps, and Amps = Watts / Volts

Ignoring a bit of inefficiency (lost watts) in the inverter, and rounding the probably 117VAC to 120VAC and the probably 13VDC to 12VDC to make it simple, if you need to run a 600 watt coffee maker...

On 120VAC, 600 watts / 120 volts = 5 amps

On 12VDC, 600 watts / 12 volts = 50 amps

In round numbers the AMPS of current draw on the 12VDC battery is about 10 times the AMPS of current draw on the 120VAC power.

What makes the question complex is deciding how much current the battery can handle before it poops out.

Batteries are commonly rated in ampere-hours. If a battery is rated 250 ampere-hours and it is providing 50 amps, it can do so for 5 hours -- IN THEORY.

I'm using a coffee pot as a simple example, and 600 watts for simple math, but real coffee makers might draw more or less (mine draws about 350 watts because it doesn't have a warmer, it has a thermos carafe. This saves power making the coffee, and uses no power to keep it warm after it is made.

TV power varies depending on type, but might be 100 watts.

Coach batteries vary in power too, so my numbers are just for example.

And of course everything else that is sucking from the battery counts too, such as lights and an external TV amplifier or DVD or VCR or satellite, etc.

The devil is always in the details.

Final note: If an inverter is mounted in the coach, wired into the AC system, it might not run ALL the AC devices -- coach makers do odd things in this area, such as assuming you want to watch TV but not make coffee, or vice versa. Some people use external inverters at each device, matched to what the device needs.
2017 Tiffin Allegro Bus
2015 Jeep Wrangler Unlimited
travelhawk is offline   Reply With Quote
Old 09-19-2010, 08:59 AM   #5
Junior Member
Join Date: Sep 2010
Posts: 2
Thanks for the great advice. Clearly I have some studying to do. It's good to know that there people out there with much more experience to help us newbies out. Hopefully some day I will be able to help someone with their trailer questions. Sam
alot2nv is offline   Reply With Quote
Old 01-20-2011, 11:58 AM   #6
Junior Member
Join Date: Oct 2010
Location: Idaho
Posts: 28
Send a message via Skype™ to PugPug
You obviously know your stuff. My 5er has a built in invertor/charger that I can run a few appliances. I installed an invertor in my sailboat to run a small microwave, blender, toaster that has worked well but yes it does suck the old batteries down.
PugPug is offline   Reply With Quote
Old 01-20-2011, 04:36 PM   #7
Senior Member
Shadowcatche's Avatar
iRV2 No Limits Club
Join Date: Nov 2010
Posts: 1,227
There are a number of on line calculators that will help with figuring out what you need and the basis is the care and feeding of DeepCycle batteries, and one of the better sources is Handy Bob (who posts in the solar and boondocking areas on this forum) his blog The RV Battery Charging Puzzle HandyBob's Blog
calculator abut half way down the page Inverter FAQ - DonRowe.com - Frequently Asked Questions about Power Inverters

Shadowcatche is offline   Reply With Quote

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
Power Inverter install? cgau Damon 3 04-20-2010 07:46 PM
power inverter ?? Greybeard Winnebago Industries Owner's Forum 2 06-26-2008 02:27 PM
Installing Xantrex Pure sine wave inverter in a 2003 Scottsdale park_ridge_dave Newmar Owner's Forum 5 06-18-2007 12:08 PM
Inverter humming with all power off DaveOhio Winnebago Industries Owner's Forum 6 05-30-2007 02:45 PM
Benefits of installing an inverter? Linda J. Pop Up, Tent Trailer and Teardrop Topics 3 08-06-2006 05:22 PM

» Featured Campgrounds

Reviews provided by

Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 02:46 AM.

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2018, vBulletin Solutions, Inc.