Thread Tools Search this Thread Display Modes
Old 02-15-2015, 10:36 AM   #1
2 Rivet Member
2015 25' FB Flying Cloud
Meadow Vista , California
Join Date: Jan 2015
Posts: 45
How Much Energy Does A 2015 FB FC Use?

Trying to understand how much energy is used to run my Airstream. Has anyone done an audit of all systems, alarms, lights , heater, refer etc....
Would like to calculate the amount of amps I use and how I can increase production and storage.

SilverSinbad is offline   Reply With Quote
Old 02-21-2015, 02:10 PM   #2
2 Rivet Member
Minipad's Avatar
2013 23' FB International
2013 25' Flying Cloud
In the Rockies, 6700' , Colorado
Join Date: Nov 2012
Posts: 47
I've been trying to gather this same information. This is what I have so far:

Heater Fan - 7.6 amps.
Fantastic Fans (roof vents) - 1.89 amps on low to 3.0 amps on high.
Water pump - 4.0 to 8.7 amps.
Bathroom and Shower vent fan - 1.2 amps

I'm trying to pin down the lights, stove hood light and fan and the Sony radio. So far, haven't been able to find the data. Hopefully someone out there will help us.

Whatever the numbers really are, in order to Boondock in situations down to about 15°F overnight, with short winter days and low sun angle, I am forced to use two 150 watt solar panels and four SRM 24 batteries. In less than optimal sunlight, a generator is required to bring the batteries back to full charge before another overnight. (This is if I want to keep the batteries from reaching less than 60% state of charge or 12.49 volts.)

Minipad is offline   Reply With Quote
Old 02-24-2015, 07:12 PM   #3
2 Rivet Member
2015 25' FB Flying Cloud
Meadow Vista , California
Join Date: Jan 2015
Posts: 45
Thanks for your help, those numbers are per hour correct? I have a chart that shows 60% at 12.2 volts, have I been looking at the wrong numbers?
SilverSinbad is offline   Reply With Quote
Old 02-24-2015, 08:26 PM   #4
Rivet Master
Commercial Member
lewster's Avatar
Currently Looking...
Naples, FL , Hood River, OR
Join Date: Dec 2005
Posts: 6,799
Originally Posted by SilverSinbad View Post
Thanks for your help, those numbers are per hour correct? I have a chart that shows 60% at 12.2 volts, have I been looking at the wrong numbers?
Depends on what batteries you are talking about. There are NO absolutes, as each battery manufacturer lists different resting voltages for varying state of charge (SOC) levels.

Many battery OEMs use 12.8 as a full battery, but I have seen values from 12.7 to 13.2VDC....depends on the batteries. I have also seen 50% SOC listed anywhere from 12.0-12.2VDC.

Lifeline AGM batteries specify 12.2 as 50% SOC and 12.8-13.2 as 100%

NOTE: these voltages are for lead acid type batteries. These values and SOC readings are quite different for the new LiFePO4 lithium based batteries.

As always.............YMMV!!
Lew Farber...RVIA Certified Master Tech...ABYC Certified Master Marine Electrician
lewster is offline   Reply With Quote
Old 02-24-2015, 09:19 PM   #5
Rivet Master
TG Twinkie's Avatar
1974 Argosy 26
Morrill , Nebraska
Join Date: Nov 2009
Posts: 4,676
Images: 2
Blog Entries: 5
How Much Energy Does A 2015 FB FC Use?

I believe you are looking for ampere/hours not amps.
None of the items you list are operating 24/7.
The furnace will consume the most energy per hour of operation. Depending on the heat recovery demand. Due to heat loss in the cabin.
Obviously if you use the vent fans you will be removing air from the coach. Calculating in the radiant heat loss and heat loss because the unit is not air tight. May be difficult.
If the furnace runs for 18 hours out of 24 and it draws 8 amps. It means you are looking at replacing 144 ampere/hours of energy.
If you can estimate the number of hours each device will run. You can get a good grip on what it will take to replace that energy.
Energy conservation is the key here. Every individual has his/her idea of how to conserve and how ridged they are in the practice.
It takes considerably longer to replace the energy consumed than it does to consume it. Because of the finite regeneration capacity. Whether it be solar, shore power or generator.
Obviously as long as you are on shore power and have a converter large enough to handle the actual load along with keeping the battery(s) charged. You won't have a problem. The same goes for a generator. As long as you don't exceed the capacity of the genset. You will be OK.
It does take more diligence where solar power is concerned. Just because a solar panel is rated at 100 watts doesn't mean it will produce the maximum. Cloud cover, angle of the sun, internal losses etc. will reduce it's capacity.

Sent from my iPod touch using Airstream Forums
Knowledge: "A gift to be shared. A treasure to receive."
TG Twinkie is offline   Reply With Quote
Old 02-24-2015, 10:16 PM   #6
Rivet Master
1974 Argosy 20
2014 20' Flying Cloud
Kooskia , Idaho
Join Date: Jul 2009
Posts: 4,592
This post will give you information on the Amp draw of various things in a 2014 FC 20'. You can estimate the hours you will be using any item, and multiply it by the amps to get amp hours (a way of measuring energy).

The original type 24 batteries Airstream supplies will have a capacity of about 75 amp hours each, or 150 amp hours total, but should not be used down to much less than 50% capacity for longest life, therefor you only have about 75 amp hours to work with.

idroba 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
NorCal : 2015 Jackson Rancheria Fally Rally October 9-11, 2015 Coastalview Forum Rallies & Meet Ups 46 08-12-2016 02:27 PM
2015 International 30 vs 2015 Classic ZBoater 2011 - 2015 International 41 05-28-2015 08:47 AM
How much should I pay for a 2015 ? silverwheels Trailer Values 70 05-03-2015 08:46 AM
2015 MOUNTAIN AIR Rally April 17-20 2015 shermantic Forum Rallies & Meet Ups 2 01-13-2015 07:43 AM
Are A/S energy efficient? John Our Community 2 10-06-2003 11:49 AM

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 01:18 AM.

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2016, Jelsoft Enterprises Ltd.

Airstream is a registered trademark of Airstream Inc. All rights reserved. Airstream trademark used under license to Social Knowledge LLC.