Free 7 Day Trial RV GPS App RV Trip Planner Campground Reviews RV Maintenance Free 7 Day Trial ×

Thread Tools Search this Thread Display Modes
Old 08-03-2021, 12:35 PM   #1
1 Rivet Member
2021 25' Flying Cloud
Poulsbo , Washington
Join Date: Sep 2020
Posts: 8
Run inverter while towing - does battery charge?

Hi all,

We have a 2021 FC 25 with stock everything (flooded lead acid batteries). I have a Truma portable fridge that pulls 5A @ 120VAC that I was considering leaving plugged in to the camper while towing. Seems like this would be within the capacity of our 1000W inverter.

My question is: will the batteries continue to "pass through" charge from the 12V pin on the tow vehicle while the inverter is on? Any safety issues with towing using the inverter (I can't think of any since it just energizes a few plugs + the A/V system)?

canuck_in_wa is offline   Reply With Quote
Old 08-03-2021, 12:56 PM   #2
Rivet Master
1986 31' Sovereign
Miami , Florida
Join Date: Feb 2004
Posts: 2,844
Blog Entries: 13
Well, your load is 600 watts so,we’ll within the capability of your inverter. But, you’ll be pulling north of 50 amps from your 12VDC system to do it. The umbilical will provide some small portion of that, but not much.

So, depends on how far (how long) you need to power it and what the capacity of your battery bank is.
Sorta new (usually dirty) Nissan Titan XD (hardly paid for)
Middle-aged Safari SE
Young, lovely bride
Dismissive cat
n2916s is offline   Reply With Quote
Old 08-03-2021, 01:17 PM   #3
DKB_SATX's Avatar

2017 26' Flying Cloud
Alamo Heights , Texas
Join Date: Aug 2006
Posts: 8,103
Images: 1
Blog Entries: 7
I think you may have confused the DC amp draw with the AC amp draw. Truma rates them for 5-6 amps at 12v, 0.6-0.74 amps at 120v AC.

So, you could just wire up a 12v connection for it somewhere (if you don't have one handy) or you could run it off the inverter as planned. It's less efficient off the inverter (because you have the inverter's inherent inefficiency, and probably some conversion inefficiency within the Truma) but at 1/10th the draw you were thinking, it probably won't be a deal-breaker.
Attached Thumbnails
Click image for larger version

Name:	truma_cooler.png
Views:	7
Size:	94.8 KB
ID:	400980  
— David

Zero Gravitas — 2017 Flying Cloud 26U | WBCCI# 15566

He has all of the virtues I dislike and none of the vices I admire. — Sir Winston Churchill
DKB_SATX is offline   Reply With Quote
Old 08-10-2021, 08:06 PM   #4
1 Rivet Member
2021 25' Flying Cloud
Poulsbo , Washington
Join Date: Sep 2020
Posts: 8
Thanks, DKB_SATX - that was a good catch. I had been doing some calculations for using the fridge on a 12v line from an external battery bank and forgot to flip back to the amps for 120v.

We went on a trip last weekend with the inverter on while towing and the Truma plugged in to AC and everything worked out well!
canuck_in_wa 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
Is it ok to run fridge on propane while towing ? steve.thomps LP Gas, Piping, Tanks & Regulators 155 08-24-2021 06:01 AM
83Excella: Does truck battery charge trailer battery? LY007 Batteries, Univolts, Converters & Inverters 0 06-25-2019 09:44 AM
Run fridge on 110v (inverter) while driving? DHart Batteries, Univolts, Converters & Inverters 36 05-27-2015 05:23 AM
Charge wire on 7-pin, what demands does AS need and how does this charge starcraft Batteries, Univolts, Converters & Inverters 10 04-20-2012 08:38 AM
Inverter to run refer while driving... lilynhoward Batteries, Univolts, Converters & Inverters 26 11-21-2010 02:06 PM

Featured Campgrounds

Reviews provided by


This website is not affiliated with or endorsed by the Airstream, Inc. or any of its affiliates. Airstream is a registered trademark of Airstream Inc. All rights reserved. Airstream trademark used under license to Social Knowledge LLC.

All times are GMT -6. The time now is 02:55 AM.

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2021, Jelsoft Enterprises Ltd.