Thread Tools Display Modes
Old 05-01-2013, 10:14 PM   #1
Junior Member
elmonsanto's Avatar
Join Date: Mar 2013
Location: San Francisco, CA
Posts: 25
1,000 Watt Yamaha EF1000iSC for dry camping?

My wife and I have a Rockwood A122S A Frame Camper and we're wondering whether a 1,000 Watt Yamaha EF1000iSC would work for us dry camping. I have a herniated disc in my lower back and don't think I can handle the weight of the heavier EF2000iS.

Our A122S has two 6-volt 232 amp-hour batteries and we plan to only use the generator for keeping the batteries charged. Here's my best guess at what our daily 12-volt usage would be:

CO detector .............1 amp x 24 hrs.......= 24 amp-hrs
LP leak detector........1 amp x 24 hrs.......= 24 amp-hrs
water pump-----------4 amps x 0.25 hrs---= 1 amp-hr
furnace..................10 amps x 1 hr.........= 10 amp-hours
ceiling fan.............2.3 amp x 4 hrs.........= 9 amp-hours
The total is about 68 amp-hours in 24 hours.

I could use a CO detector that runs off a 9-volt battery and save 24 amp-hours. I don't know if there are any LP leak detectors that run off of AA or 9-volt batteries. I couldn't find any on

The plan is to bypass the A122S converter and connect the EF1000iSC to a external battery charger to replace the 68 amp-hours deficit. I found a battery charger on

Schumacher SC-10030A SpeedCharge Automatic Charger and Maintainer : : Automotive

that requires 7 amps on input and puts out 30 amps when bulk charging. The EF1000iSC only puts out 7.5 amps so I'm not sure the generator will supply enough power to this battery charger. Would this put too much load on the generator?

Is it realistic for use to try using EF1000iSC for dry camping? We would really appreciate any guidance you can give us.


Laurel & Lynn (amateur radio W6JAE)
Felix & Cleo (retired greyhounds)
2006 Toyota RAV4
2013 Rockwood A122S
elmonsanto is offline   Reply With Quote
Old 05-01-2013, 11:15 PM   #2
Senior Member
GlacierGus's Avatar
Join Date: Mar 2012
Location: Minnesota
Posts: 454
elmonsanto- I recently went thru the same thought process you are going through. Our Mini Lite is probably only a little larger than your TT. In my opinion a 1000 watt gen would not be large enough. I think you would want to go to a Yamaha or Honda 2000 at a minimum.

Having said that, I finally went with the Dometic 3000. It was actually less expensive than a Honda or Yamaha 2000 and just as quiet. A 3000 will also run the air conditioning whereas a 2000 will not. Only time will tell if the Dometic is as durable as a Honda.

Remember just make sure which ever gen you buy that it is an inverter unit. The inverter gens are much better for the RV electronics.

2013 Rockwood Mini Lite 2109S
2006 Dodge Durango Hemi 5.7
Equal-i-zer WDH
GlacierGus is offline   Reply With Quote
Old 05-01-2013, 11:34 PM   #3
Junior Member
elmonsanto's Avatar
Join Date: Mar 2013
Location: San Francisco, CA
Posts: 25
Originally Posted by GlacierGus View Post
In my opinion a 1000 watt gen would not be large enough. I think you would want to go to a Yamaha or Honda 2000 at a minimum.
I totally agree with you that a 2000 watt generator would fit our needs better. Unfortunately, my bad back won't let me carry something the size and weight of the Yamaha 2000. I think I can manage the 10 pounds lighter and smaller 1000.
Laurel & Lynn (amateur radio W6JAE)
Felix & Cleo (retired greyhounds)
2006 Toyota RAV4
2013 Rockwood A122S
elmonsanto is offline   Reply With Quote
Old 05-01-2013, 11:37 PM   #4
Senior Member
ronhanson's Avatar
Join Date: Jun 2009
Location: Colorado
Posts: 322
I think you have overestimated your CO and LP detector. I would be surprised if those consumed more than 5 amp/hrs each. I think you will be fine with your plan, you're really not consuming that much.

You might also want to consider the Black and Decker chargers, they are highly recommended on several rv forums
Black & Decker VEC1093DBD Smart Battery 40/20/10/4 Amp Battery Charger : : Automotive
Ron Hanson
2009 Georgetown 350TS (bunks)
400W solar, 440AH 6V GC2
2009 Ford Edge AWD Ltd towed
2011 Honda Fit Sport towed
ronhanson is offline   Reply With Quote
Old 05-01-2013, 11:55 PM   #5
Senior Member
Iggy's Avatar
Join Date: Jul 2010
Location: Desert SW - Arizona
Posts: 5,887
You are considering 12 volt DC and what you will be using is a 1,000 watt AC generator that has a 15 amp circuit.

Try this before you buy.
Hook up your trailer to a standard 120 volt 15 amp ciruit breaker at home and see if it holds or trips. That is no different than a 1,000 watt generator with a 15 amp output circuit.

Unless you plan on using an AC or Microwave I feel a 1,000 watt is all you need for your battery charger/convertor and 120 volt ceiling fan
All the rest run off of 12 volt DC battery.
And the amperages you used is not correct and pull differntly if it 12 volt DC or 120 Volt AC

Bottom line is do the home test I mention first before buying anything.

If you ahve any other questions just ask.

PS I have been a qualified Journey level electrician and Electrical project manager for over 40 years. I think I know a little about electricity.

Good luck
2012 Georgetown XL - 378TS 49,000 miles
(2013 - 98 days) (2014 - 117 days) (2015 - 67 days) (2016 - 115 days)
USAF Retired - MSgt

Iggy is offline   Reply With Quote
Old 05-02-2013, 12:17 AM   #6
Senior Member
kz08h5's Avatar
Join Date: Apr 2009
Location: Carmel, Indiana
Posts: 308
I agree with Iggy. If all you are really trying to do is charge the batteries a 1000 w generator should handle it. I have a Honda 2000 I that I use,for dry camping. I charge the single12v deep cycle battery everyday with it and a Schumaker charger(not the one originally mentioned) and the generator barely comes off idle. My coffee pot makes it scream. After a cold snowy night in Idaho running the furnace I get the battery charged to full in about 3 hours or less.

Now if you are charging batteries and running all the stuff you listed, all bets are off.

2008 Chevy Silverado 2500 Duramax Crewcab
Jeep Commander - sold
Flagstaff V-Lite WRB26
kz08h5 is offline   Reply With Quote
Old 05-02-2013, 04:54 AM   #7
Senior Member
RPAspey's Avatar
Join Date: Jul 2008
Location: central PA
Posts: 972
Although I'm not familiar with your camper or it's converter, I think you'd be better off saving your money on the charger and just using the converter in your camper. It's designed to charge the batteries quickly and provide you 12v power while doing so. If you use the charger from Amazon, it's output will be reduced by the trailers usage. The converter has worked for you thus far right? why change.

The 1000w inverter generator is an excellent generator. If you don't use the air conditioner, nor a microwave - assuming you have one and if you turn your fridge and water heater to gas only, that ef1000is will serve you well.

Now of course there are a few things to think about: a coffee pot will consume alot of that wattage when brewing. Go ahead, brew that pot of coffee, then keep it warm using the propane. Hair dryer - not a good idea. Any other high wattage items such as toasters or electric heaters are out of the question. But then again, you're dry camping

I think you might be surprised how much that generator will power if you are conservative. If in doubt, buy a power-miser power meter, its a plug in meter that your camper can plug into. It will then show your usage in watts & amps. It should cost you about $20 at Harbor Freight, although any big box will carry it at more $. Using the meter, you can then judge if the generator will work.
2000 Cherokee 29BH with 6V batteries, LED lights & 400 watts of solar power, flipped axles and raised. 2007 Tundra 5.7L DC-LB with lots of mods. C-co, 8/158th AVN Maint.
RPAspey is offline   Reply With Quote
Old 05-02-2013, 06:20 AM   #8
Senior Member
Join Date: Mar 2013
Location: Houston, TX
Posts: 1,598
No personal experience with your setup, but I can't imagine that the 1000 would be insufficient for charging eve those big batteries. As far as the charger, batteries are sensitive to excess charging amperage, is 30 amps too much current to put into them? If it is OK then I would buy the charger, run the batteries down half way and see if the setup works. If it draws too much current, return the charger and buy a 20 amp charger.

I have wanted one of those little gensets for a while do let us know what you find out.

2012 Rockwood A122S
2008 Toyota Tundra Double Cab 4X4

Former owner of a 2002 Coleman Niagara GTE
Pooneil is offline   Reply With Quote
Old 05-02-2013, 06:29 AM   #9
Phat Phrog Stunt Team
TURBS's Avatar
Join Date: Aug 2011
Location: Iowa
Posts: 34,205
Read this.
normal appliance amp draws
TURBS is online now   Reply With Quote
Old 05-02-2013, 07:05 AM   #10
Site Team
KyDan's Avatar
Join Date: Mar 2008
Location: Louisville, KY
Posts: 5,651
You can get AA powered LP detectors at WalMart. I just bought one last
fall. In fact their website lists a dual pack. LP and smoke det. Both battery
powered. First Alert SCO403 Alarm Combination Pack -
They also list the LP alarm alone for $18. That's the one I bought last

Also, a 1000 watt genny is PLENTY for battery charging!!!
This has been discussed here often and at length.
As long as you aren't wanting to run your roof AC or microwave a 1000 watt
genny is huge.

If you have a 30 amp charger--
Amps times Volts = Watts. remember we're talking about charging 12v batts.
30 amps X 12 volts = 360 watts.
Allow 20% for heat loss in the charger and you are still
WAY below your 1000 watts genny max output.
A 1000 watt genny is probably only rated 1000 for brief peak loads.
Max continuous load is more likely in the 750 - 800 watt range but you
are STILL in good shape.

OK on re-reading your post I see the charger says it requires 7 amps input??
That's a lot. Remember battery load is only highest when batteries are
seriously discharged and that load will go down fairly rapidly as batteries
charge. I still believe the 1000 is enough to do the job for you--
especially if you don't let your batteries get too discharged first.
Remember for best battery life you want to re-charge when they are
50% discharged or sooner!

I use a 25 amp output automatic charger and my 2000 genny is positively
loafing. I wish I had a lighter 1000 myself!

Get the smaller, lighter, slightly cheaper 1000 watt. I wish I had!

Dan & Rita D
2004 5.3L Silverado 1500 ext. cab 2WD
1999 Suzuki Intruder Motorcycle
Blue Ox WD hitch, AirLift load levelers

Camping days 2010-53, 2011-47, 2012-41,
2013-41, 2014-31, 2015-40, 2016-38
KyDan is offline   Reply With Quote

Thread Tools
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 is not in any way associated with Forest River, Inc. or its associated RV manufacturing divisions.

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 -5. The time now is 06:10 PM.