Electric system question - Page 2 - Fiberglass RV

Thread Tools Search this Thread Display Modes
Old 03-09-2016, 11:56 AM   #15
Senior Member
Steve L.'s Avatar
Name: Steve
Trailer: 2003 Casita 16' SD
Posts: 1,652
I'm going to go with the others that suspect you have "phantom" loads you don't know about that are draining your battery.

However, a questionable battery from Walmart isn't unheard of. Also, I believe they use the term "deep cycle" a little loosely, often referring to hybrid starting/deep cycle batteries. If the battery specs refer only to CCA (cold cranking amps) you probably don't have a true deep cycle and as many amp-hours as you might think.

I don't have much use for the plug in volt meters. However, if the trailer is plugged in and the meter reads in the range that Jon provided you then the converter is charging the battery.

If the trailer is not plugged in, the converter will not do anything. Just a lump of wiring.

If your inclined to buy tools at the slightest need (as I am) then a clamp-on digital ammeter that reads DC amps (not all do, check the specs) then you can clamp around one of the battery wires while the trailer is "resting" and it'll provide the total "phantom" amp load.

Sources of phantom loads:
Refrig control board
CO/CO2 alarms
Digital clock/alarm or TVs running on 12vDC. Even TV's turned off have a draw.
Volt meters (like the ones stuck into an accessory socket
Battery monitors
Assorted stray current, usally from improper grounds. (this is a real problem with fiberglass boats)
"idle" inverters

The best defense against any of these a battery switch in the positive battery cable. Needs to be pretty heavy duty.

Quando omni flunkus, moritati
Steve L. is offline   Reply With Quote
Old 03-10-2016, 12:47 PM   #16
Senior Member
Name: Patrick
Trailer: R-Vision Trail Lite
New York
Posts: 576
Thank you Steve L. Armed with all the info gathered from this inquiry I feel confident once my new real deep cycle battery arrives from Amazon all will be well.

Yes, most if not ALL the deep cycle batteries at Walmart are labeled " Marine/RV deep cycle" and list CCAs (a clear indication they are dual purpose and lack the thickness in their lead plates to preform as true deep cycle.

As with all things in life...the more you know the better the buying decision.

Thanks again to all.

Uplander 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
Water system question for 1991 Scamp LurkerDan Problem Solving | Owners Helping Owners 11 10-17-2014 01:12 AM
Propane & Electric vs Just Electric Wallo Care and Feeding of Molded Fiberglass Trailers 75 03-06-2014 05:24 PM
Electric System - Converter/Inverter Specs Celeste Care and Feeding of Molded Fiberglass Trailers 5 05-06-2012 06:39 AM
All electric, or gas and electric? Homer Teitsma Electrical | Charging, Systems, Solar and Generators 24 10-07-2007 11:10 AM

» Upcoming Events
No events scheduled in
the next 465 days.
» 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 03:41 AM.

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