RV.Net Open Roads Forum: Tech Issues: And Another Battery Question

RV Blog

  |  

RV Sales

  |  

Campgrounds

  |  

RV Parks

  |  

RV Club

  |  

RV Buyers Guide

  |  

Roadside Assistance

  |  

Extended Service Plan

  |  

RV Travel Assistance

  |  

RV Credit Card

  |  

RV Loans

Open Roads Forum Already a member? Login here.   If not, Register Today!  |  Help

Newest  |  Active  |  Popular  |  RVing FAQ Forum Rules  |  Forum Posting Help and Support  |  Contact  

Search:   Advanced Search

Search only in Tech Issues

Open Roads Forum  >  Tech Issues

 > And Another Battery Question

Reply to Topic  |  Subscribe  |  Print Topic  |  Post New Topic  | 
Page of 3  
Next
Sponsored By:
Katdaddy

Petal, MS USA

Senior Member

Joined: 08/25/2003

View Profile



Posted: 10/27/21 09:52am Link  |  Quote  |  Print  |  Notify Moderator

We just got back from our yearly trip to the Cades Cove. No hookups in the campground, so we are dry camping. I equalized the batteries right before we left and after resting overnight the batteries voltage showed 90%. We get to the campground and set up and voltage shows 70%. I have a solar panel and it would show the batteries fully charged by the end of the day, but as soon as the sun went down they went back down to 70ish%. Sams Club golf cart batteries. The temps at home before we left when I checked everything was in the 80s. Temps in the mountains were low 60s during the day and low 40s at night. I let the batteries rest overnight when we got home yesterday and voltage back to around 100%.
So, does altitude affect readings? I have a chart that I printed of web some years back that shows voltage readings according to temperature. That chart shows the 12.30 reading at the temps we were experiencing as between 90 to 100%. Is this in any way accurate?
With the solar panel we have plenty of juice, just trying to understand what is going on.
As always, thanks for all your help.


Little by little, one travels far - J.R.R. Tolkien
There ain't no surer way to find out whether you like people or hate them than to travel with them. - Mark Twain

2oldman

NM

Senior Member

Joined: 04/15/2001

View Profile


Offline
Posted: 10/27/21 10:21am Link  |  Quote  |  Print  |  Notify Moderator

Voltage alone is not a good indicator of capacity. Your batteries may be old. One solar panel is usually not enough to maintain one battery let alone several, depending on your use. Those temps should not affect things very much.

Katdaddy

Petal, MS USA

Senior Member

Joined: 08/25/2003

View Profile



Posted: 10/27/21 10:50am Link  |  Quote  |  Print  |  Notify Moderator

Batteries are 3 years old and we are very conservative with battery usage. The part that confuses me is the voltage is back up now that we are home. I guess I am going to have to take hydrometer next year to see what it says.

TUCQUALA

Kennewick, WA

Senior Member

Joined: 10/29/2003

View Profile



Posted: 10/27/21 11:11am Link  |  Quote  |  Print  |  Notify Moderator

Having used GC2 batteries for many years, both myself and my son have seen voltages similar to yours. They seem to charge up fully, and when in use drop down in voltage to around 12.6 or so. Not much below fully charged. The biggest plus for them is that they hold the charge and last longer than most 12V batts for some reason. The real number is what your voltage is in the morning, esp if using furnace in cooler weather. Our 4-1/2 yr old 6Vs will be at 12.2 or so in the morning and recover very quickly when the sun starts shining. Sons act similar. Personally (with no actual proof!!) feel that this is a normal pattern for a true deep cycle 6V pair!!

Also, hydrometer almost always shows above 1275 when recharged!!! Never have checked in the morning, no problem, no fault!!!


'16 Outdoors Timber Ridge 280RKS
Reese 1700# Trunnion w/ DualCam HP
'03 EXCURSION XLT V10 4.30 Axles


DrewE

Vermont

Senior Member

Joined: 08/23/2014

View Profile


Offline
Posted: 10/27/21 11:23am Link  |  Quote  |  Print  |  Notify Moderator

Altitude should not affect battery voltage or charge characteristics to any significant degree--probably not at all for any practical purposes. The chemistry of a lead-acid battery is not affected by ambient air pressure in any meaningful way.

Cades Cove is not at a particularly high elevation anyhow, around 1700 feet or so.





pianotuna

Regina, SK, Canada

Senior Member

Joined: 12/18/2004

View Profile


Offline
Posted: 10/27/21 11:23am Link  |  Quote  |  Print  |  Notify Moderator

More details needed.

How many 6 volt batteries?

What total capacity at 12 volts?

How did you equalize them? I.E. with a converter or?

Did you get them up to 14.8 volts during equalization?


Regards, Don
My ride is a 28 foot Class C, 256 watts solar, soon to have SiO2 batteries, 3000 watt Magnum hybrid inverter, Sola Basic Autoformer, Microair Easy Start.

Sandia Man

Rio Rancho, NM

Senior Member

Joined: 08/09/2008

View Profile



Posted: 10/27/21 12:29pm Link  |  Quote  |  Print  |  Notify Moderator

Not sure if you have an issue, too many variables but temp and altitude are not factors in this scenario. I don't fret minor DC voltage fluctuations, and I don't always rely solely on what our solar charge controller, EMS, or my multimeter indicates as it pertains to battery health at any given moment in time.

I find it prudent to have a genny when RVing off the grid, along with our fast charging smart converter I know I can restore amphours into our 12 volt reserves should the need arise. Not parking under trees, RVing in cloudy weather, or just barely using our rig's amenities to eek by are things we have long had to worry about.

Katdaddy

Petal, MS USA

Senior Member

Joined: 08/25/2003

View Profile



Posted: 10/27/21 01:32pm Link  |  Quote  |  Print  |  Notify Moderator

I guess I didn't express my question clearly. What I am curious about is, the Sg and voltage showed around 90% charge on my batteries right before I left home. The whole time I was in the mountains the voltage read around 12.30. The solar would show the voltage up to 13.00 during the day and then it would again drop to 12.30 after dark. As soon as I got home the voltage is back up to 12.60. Where did that .30 go during my time in the mountains and why did it immediately show back up when I got home?

pianotuna

Regina, SK, Canada

Senior Member

Joined: 12/18/2004

View Profile


Offline
Posted: 10/27/21 01:42pm Link  |  Quote  |  Print  |  Notify Moderator

Katdaddy,

90% after sitting idle for 24 hours?

2oldman

NM

Senior Member

Joined: 04/15/2001

View Profile


Offline
Posted: 10/27/21 01:44pm Link  |  Quote  |  Print  |  Notify Moderator

Katdaddy wrote:

The solar would show the voltage up to 13.00 during the day and then it would again drop to 12.30 after dark.
What does 'the solar would show' mean? The panel on the controller? During full sun?

Reply to Topic  |  Subscribe  |  Print Topic  |  Post New Topic  | 
Page of 3  
Next

Open Roads Forum  >  Tech Issues

 > And Another Battery Question
Search:   Advanced Search

Search only in Tech Issues


New posts No new posts
Closed, new posts Closed, no new posts
Moved, new posts Moved, no new posts

Adjust text size:




© 2021 CWI, Inc. © 2021 Good Sam Enterprises, LLC. All Rights Reserved.