Journey with Confidence RV GPS App RV Trip Planner RV LIFE Campground Reviews RV Maintenance Take a Speed Test Free 7 Day Trial ×
 

Go Back   Thor Forums > Thor Community Forums > Introduce Yourself | Say Hello
Click Here to Login
Reply
 
Thread Tools Display Modes
 
Old 08-16-2022, 10:39 PM   #1
Lmm
Junior Member
 
Brand: Thor Motor Coach
State: New Mexico
Posts: 5
THOR #27702
Magnum auto generator start/Batteries Dying

I am dropping 1 volt on chassis batteries while disconnected from shore power in 1 day. The only thing that is noticeable is green ready light on this magnum device. I am sure there are many phantom drains, but this device remains lite while Rv switch is off. Can I disconnect this device by unplugging without causing other problems? My chassis batteries have always lost power while storing. All batteries are new and in good shape. 2018 Thor 31 freedom.

__________________
Lmm is offline   Reply With Quote
Old 08-16-2022, 11:32 PM   #2
Site Team
 
16ACE27's Avatar
 
Brand: Thor Motor Coach
Model: ACE 27.1
State: Florida
Posts: 10,168
THOR #7035
define "drop one volt.

Dropping from 13.6 VDC to 12.6 VDC is just removing the surface charge.

Dropping from 12.6 VDC to 11.6 VDC is going from 100% to 20% - quite a large non-use drop in one day.
__________________
Ted & Melinda
2016 ACE 27.1
2016 Chevy Sonic Toad
2020 Chevy Colorado Z71 Trail Runner Alternate Toad
16ACE27 is offline   Reply With Quote
Old 08-17-2022, 12:47 AM   #3
Lmm
Junior Member
 
Brand: Thor Motor Coach
State: New Mexico
Posts: 5
THOR #27702
Voltage loss on chassis

Voltage went from 12.7 to 11.7. Thanks
__________________
Lmm is offline   Reply With Quote
Old 08-17-2022, 12:53 AM   #4
Lmm
Junior Member
 
Brand: Thor Motor Coach
State: New Mexico
Posts: 5
THOR #27702
My batteries aren’t reaching over 13 volts from shore power, I must have another issue
__________________
Lmm is offline   Reply With Quote
Old 08-17-2022, 01:28 AM   #5
Site Team
 
16ACE27's Avatar
 
Brand: Thor Motor Coach
Model: ACE 27.1
State: Florida
Posts: 10,168
THOR #7035
Quote:
Originally Posted by Lmm View Post
My batteries arenít reaching over 13 volts from shore power, I must have another issue
The battery voltage applied when charging from the converter (or alternator) will go from 14.5 VDC (bulk charging), to 13.6 VDC (absorption charging) to about 13.1 VDC (float charging). Once the charge is removed a good battery will return to its fully charge voltage of 12.6 VDC to 12.8 VDC after an hour of so. IF your batteries are being fully charged (which takes hours, 4 to 6 depending on the State of Charge (SOC) when beginning the charge cycle, and they are dropping to 11.7 VDC in a day, then you have a significant draw on the batteries or their capacity has been diminished.
__________________
Ted & Melinda
2016 ACE 27.1
2016 Chevy Sonic Toad
2020 Chevy Colorado Z71 Trail Runner Alternate Toad
16ACE27 is offline   Reply With Quote
Old 08-17-2022, 01:31 AM   #6
Site Team
 
EA37TS's Avatar
 
Brand: Entegra
Model: Accolade 37TS
State: South Dakota
Posts: 7,472
THOR #1469
4 to 5 year old batteries may be on their last leg. Might be time to have them tested and replaced.
__________________
EA37TS is offline   Reply With Quote
Old 08-17-2022, 12:00 PM   #7
Lmm
Junior Member
 
Brand: Thor Motor Coach
State: New Mexico
Posts: 5
THOR #27702
Batteries are 7 months old. It’s poring rain today, I’ll continue tomorrow.
__________________
Lmm is offline   Reply With Quote
Old 08-17-2022, 02:23 PM   #8
Senior Member
 
The Gritz Carlton's Avatar
 
Brand: Thor Motor Coach
Model: THOR Chateua 35SF
State: Florida
Posts: 4,768
THOR #11130
Quote:
Originally Posted by Lmm View Post
Batteries are 7 months old. Itís poring rain today, Iíll continue tomorrow.

Excellent tool for battery testing. Even though they are only 7 months old, you could have one battery dying. A bad battery in a set will pull the other one down with it. This tool is fool-proof. Charge both batteries to full SOC and follow the 10 second test instructions. It will eliminate batteries as the culprit up front. I disconnect all cables from the batteries before testing as it isolates the test to just that battery.



https://www.amazon.com/OTC-3181-Heav.../dp/B000O3U2UQ
__________________
2018 THOR Chateau 35SF
Two Labs, Bugsie & Blondie
The Gritz Carlton is offline   Reply With Quote
Old 08-17-2022, 03:52 PM   #9
Lmm
Junior Member
 
Brand: Thor Motor Coach
State: New Mexico
Posts: 5
THOR #27702
Load tester

I have a load tester. Great idea, I will check tomorrow as today it is raining.
__________________
Lmm is offline   Reply With Quote
Reply

Tags
batteries discharge, magnum generator starter

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


» Featured Campgrounds

Reviews provided by

Disclaimer:

This website is not affiliated with or endorsed by Thor Industries or any of its affiliates. This is an independent, unofficial site.




All times are GMT. The time now is 03:53 PM.


Powered by vBulletin® Version 3.8.8
Copyright ©2000 - 2022, vBulletin Solutions, Inc.
Content Relevant URLs by vBSEO 3.6.0 PL2