Go Back   iRV2 Forums > TRAVEL TRAILER, 5th WHEEL & TRUCK CAMPER FORUMS > Travel Trailer Discussion
Join iRV2 Today

Mission Statement: Supporting thoughtful exchange of knowledge, values and experience among RV enthusiasts.
  This discussion is proudly sponsored by:
Please support our sponsors and let them know you heard about their products on iRV2
Thread Tools Search this Thread Display Modes
Old 12-23-2015, 03:58 PM   #1
Junior Member
Join Date: Oct 2015
Posts: 2

I am a newbie. Need some help re: generators. I run a 23 ft travel trailer. I have 2 12v batteries set up in parallel and a 3000 wt Go Power inverter with remote start. I want to dry camp, and the only thing I really need to run off the batteries is a CPAP machine for my breathing, and the fan for my propane heater, which I leave at low temps and therefore only kicks in a few times a night. Problem seems to be that I can't get more than one night out of the batteries without them losing a lot of juice. I've already burnt 2 batteries trying to get 3 nights out of them. I'm thinking I need a generator, but don't know what size or type to get. Any suggestions??

whyteye 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 12-23-2015, 04:08 PM   #2
Senior Member
Join Date: Feb 2013
Location: Graham, WA
Posts: 362
No inverter is 100% efficient. All experience some loss. Yours looks to be at least 3X larger than to need. You're probably losing as much energy as you're using.

If you do get a generator, be sure to get one of the super quiet inverter type. Something like the Honda EU-2000 or equivalent. Home Depot sells a Ryobi 2200 watt for around $600. Don't waste your money on one of the cheaper industrial style. Way to loud.

2006 Gulfstream Friendship G7, Cat C7 and Allison 6 spd
Honda VTX and Crusier Lift on the back
Blue Ox Aladdin, Brake Buddy, 2014 Chevy Equinox toad
Dennis4809 is offline   Reply With Quote
Old 12-23-2015, 04:14 PM   #3
Senior Member
Bumps's Avatar
Winnebago Owners Club
Join Date: Sep 2013
Location: FTer Class of 2015 Origin: Evergreen, Colorado
Posts: 1,530
I think the inverter may be a tad big for you (I don't know your specific power demands but remember there is some overhead just to run the Inverter). We are running the same 3000 watt inverter but with eight 6v batteries behind it. And 1000 watts of solar to keep the batteries fresh. With that, we keep our residential fridge running, some lights, some TV, and some chargers for laptops, etc. we rarely need the genny unless we want to bake, or vacuum, or run a power tool, etc.

If you added a genny to your setup you prolly won't need such a beefy inverter.


Ken & Deb (WIT Club, FMCA, SKP, Harvest Hosts, and grateful volunteers with SOWERs)
2005 Winnebago Vectra 40FD w/400ISL and Allison 3000MH on Freightliner's Evolution chassis, Onan QD7500, 1000w Renogy solar, BlueOx tow gear, and 2015 Cherokee TrailHawk toad.
Bumps is offline   Reply With Quote
Old 12-23-2015, 04:17 PM   #4
Senior Member
Join Date: Dec 2015
Posts: 254
From the usage you describe it would seem a Honda or Yamaha 1000 would handle your needs. You could probably get by with smaller and with other brands. I have just found those to be dependable and serviceable.

Steve & Andra
02 Ford Powerstroke 7.3
Current "Next Last" RV - 08 Copper Canyon
Mr_Fixit is offline   Reply With Quote
Old 12-23-2015, 04:43 PM   #5
Junior Member
Join Date: Oct 2015
Posts: 2
Thanks all for your responses. Still confused though. Obviously my inverter is too large. If I buy a genny, I won't be able to run it at night most of the time. Don't I still need an inverter to convert the battery power to AC. If I do buy a genny can't I just power up my batteries with it during the day and get a good night's use from the CPAP. By the way it apparently draws 6.67 A.
whyteye is offline   Reply With Quote
Old 12-23-2015, 05:58 PM   #6
Senior Member
Join Date: Jul 2014
Posts: 5,517
The CPAP draws 7 amps, your inverter is 80% to 90% effecent so let's say 8.5 amps every hour you are sleeping.

That 8.5 AH and if you sleep 8 hours, that's 68 AH used for that.

Don't know what batteries you have but that could be close to your usable capacity, if you have group 24 batteries. ( you only want to use half your stored power to not damage your batteries )

That means you need to replace 68 AH the next morning. A 40 amp charger will take about 3 hours to do that, because it goes in harder then it comes out. (This calculation does not include any other power use )

So yes a generator running your charger will work, but you need to run it every day.

Many people run the generator for 2 to 3 hours in the morning and then again for 2 hours before bed.

The Honda or Yamaha 1000 watt generators are nice, quiet, gas sipping units. Maybe 1/2 gallon a day to keep your batteries charged.

Don't plan on running your air conditioner with them though. Need 2800 or more watts for that.

2, 6 volt "Electric Golf Car" batteries in series may give you better service. They will give you 205 to 245 AH and many more discharge and re-charge cycles in them, then most 12 volt batteries. You still need to recharge them when the get to 50% charge ( 12.06 volts ).

It's a lot to absorb but just keep reading about Deep Cycle batteries and charging.
twinboat is online now   Reply With Quote
Old 12-23-2015, 07:33 PM   #7
Senior Member
Outdoors RV Owners Club
Join Date: Dec 2014
Location: Nowhere, now here. Freedom!
Posts: 2,493
Get a 12v power cord for the CPAP machine. They are usually very easy to find. Then no worries about losses due to upconverting the 12v DC to 120v AC.

You should make sure you do not drain your batteries below 50% state of charge, better to stay north of 60% SoC.

If you haven't, read The 12 Volt Side of Life.
The 12volt Side of Life (Part 1)

I have a 12v cord for my Philips CPAP that I bought from Amazon. Find the exact maker and model of your machine and you will probably find one easily.
ORV 19B Full Timer, '14 Ram 2500 Diesel and a GSD. This signature updated, August 13, '16.
Currently working in Idaho Falls ID de K7NOL 146.52Mhz Safety? (CLICK ME!)
1bigmess is offline   Reply With Quote
Old 12-25-2015, 11:51 PM   #8
Junior Member
Join Date: Dec 2015
Posts: 6
I have 4 large 6 volt deep cycle batteries on my unit and can camp for almost a week without charging the batteries

wvollans is offline   Reply With Quote

batteries, generator

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

» Virginia Campgrounds

Reviews provided by

Our Communities

Our communities encompass many different hobbies and interests, but each one is built on friendly, intelligent membership.

» More about our Communities

Automotive Communities

Our Automotive communities encompass many different makes and models. From U.S. domestics to European Saloons.

» More about our Automotive Communities

Marine Communities

Our Marine websites focus on Cruising and Sailing Vessels, including forums and the largest cruising Wiki project on the web today.

» More about our Marine Communities

Copyright 2002-2015 Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 03:30 PM.

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2016, vBulletin Solutions, Inc.