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 Tech Forums > Maintenance and Repair
Click Here to Login
Reply
 
Thread Tools Display Modes
 
Old 07-29-2021, 04:31 PM   #1
Member
 
Brand: Thor Motor Coach
Model: Axis 25.2
State: New York
Posts: 46
THOR #15036
Shore power charging house batteries

What voltage should the house batteries be charged at when hooked up to shore power? 2018 Axis 25.2

__________________
Glenn Briglio is offline   Reply With Quote
Old 07-29-2021, 04:37 PM   #2
Senior Member
 
Brand: Thor Motor Coach
Model: Miramar
State: California
Posts: 891
THOR #22927
If they are 6 volts each battery should be around 6 volts, or 12 volts.
__________________
Grumpy Grampa is offline   Reply With Quote
Old 07-29-2021, 04:45 PM   #3
Senior Member
 
Brand: Thor Motor Coach
Model: Axis 24.1
State: Connecticut
Posts: 1,772
THOR #20289
The WFCO converter that came with your Axis has a very dumb charger. It puts out a steady 13.6 volts. That works if the batteries are well discharged but doesn't supply much amperage when they get up to 75% or more. I replaced mine with a Progressive Dynamics 9260 charger module which does much better.

David
__________________
DavidEM is offline   Reply With Quote
Old 07-29-2021, 05:23 PM   #4
Senior Member
 
Brand: Thor Motor Coach
State: Missouri
Posts: 2,324
THOR #6903
Download the spec sheet for the exact battery you have

On that data subset will be the correct voltage for bulk, float, adsorption and if you have a really smart charger perhaps even more stages

Set up your charger per that data for the maximum battery performance and longevity
__________________
lwmcguire is offline   Reply With Quote
Old 07-29-2021, 06:46 PM   #5
Senior Member
 
Brand: Thor Motor Coach
Model: Axis 24.1
State: Connecticut
Posts: 1,772
THOR #20289
Quote:
Originally Posted by lwmcguire View Post
Download the spec sheet for the exact battery you have

On that data subset will be the correct voltage for bulk, float, adsorption and if you have a really smart charger perhaps even more stages

Set up your charger per that data for the maximum battery performance and longevity
You can't do that with the WFCO charger. It has only one, dumb setting.

David
__________________
DavidEM is offline   Reply With Quote
Old 07-29-2021, 07:04 PM   #6
Senior Member
 
Brand: Thor Motor Coach
State: Missouri
Posts: 2,324
THOR #6903
Quote:
Originally Posted by DavidEM View Post
You can't do that with the WFCO charger. It has only one, dumb setting.

David
Not good, upgrade perhaps?
__________________
lwmcguire is offline   Reply With Quote
Old 07-29-2021, 07:45 PM   #7
Senior Member
 
Brand: Thor Motor Coach
Model: Hurricane 31S
State: Texas
Posts: 4,157
THOR #6411
Quote:
Originally Posted by DavidEM View Post
You can't do that with the WFCO charger. It has only one, dumb setting.

David
Not Quite. My old WFCO 8955 had three settings: bulk when the batteries were below 12.4 volts resting voltage, with the inverter showing voltage between 13.6 to 14.2 volts. If the resting voltage was above 12.4 and below 12.7 volts resting, the converter go into equalization mode and the inverter would show 14.2 volts. When the resting battery voltage was above 12.6 volts, the converter would go into float mode and the inverter would show 13.3 to 13.6 volts depending on inside temperature. This was with the original Harris, group 27 12 volt flooded batteries. You will have to draw a 12 volt battery down to around 12.2 volts (60%) to watch the charger go through its profile. When I converted to a 50 amp coach, I used the PPS 5375 power center. It works about the same except it monitors battery temperature to determine the charging profile of the VRLA sealed group 29 batteries.
__________________
Jim & Roy Davis
2016 Hurricane 31S
1961 Rampside in tow
Beau388 is offline   Reply With Quote
Old 07-29-2021, 08:29 PM   #8
Senior Member
 
Brand: Thor Motor Coach
Model: Axis 24.1
State: Connecticut
Posts: 1,772
THOR #20289
I guess you are right Beau but I wouldn't call them settings, stages maybe. I am used to smart, 3 step chargers on boats that would ramp up to 14.5 or so volts to keep the amperage up as the battery nears 100% charge and then switches to float when it gets there.

As you note the 8955 has a much more leisurely approach and I also noted that unless below 75% I couldn't get much current out of it, maybe a few amps. The PD 9260 that I replaced it with pushes much more amperage, about 30-40 amps at that SOC as I recall.

But it only has one battery setting, no AGM or Li just "something".
__________________
DavidEM is offline   Reply With Quote
Old 07-29-2021, 10:02 PM   #9
Site Team
 
16ACE27's Avatar
 
Brand: Thor Motor Coach
Model: ACE 27.1
State: Florida
Posts: 14,117
THOR #7035
Quote:
Originally Posted by Glenn Briglio View Post
What voltage should the house batteries be charged at when hooked up to shore power? 2018 Axis 25.2
To answer your question simply:
Your converter will put out at least 13.1 VDC to charge the 12 volt house battery(s). You may see 13.6 VDC or up to 14.5 VDC depending on what stage the converter is charging.

Once the batteries are fully charged, the converter stays in the float mode at 13.1 to 13.3 VDC.

If you disconnect the converter a fully charged 12 volt battery will display 12.6 to 12.7 VDC once the surface charge has dissipated.
__________________
Ted & Melinda
2016 ACE 27.1
2016 Chevy Sonic Toad - Selling
2020 Chevy Colorado Z71 Trail Runner Toad
2024 Chevrolet Trax 2RS - Soon 2B TOAD
16ACE27 is offline   Reply With Quote
Reply

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 02:37 PM.


Powered by vBulletin® Version 3.8.8
Copyright ©2000 - 2024, vBulletin Solutions, Inc.
Content Relevant URLs by vBSEO 3.6.0 PL2