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

Go Back   Sunline Coach Owner's Club > Sunline Club Community Forums > Sunline Community
Click Here to Login

Join Sunline Club Forums Today

Thread Tools Search this Thread Display Modes
Old 02-04-2011, 09:41 AM   #1
Join Date: Jul 2010
Posts: 31
SUN #1272
tmar04 is an unknown quantity at this point
upgrade to 'smart' battery charger

I read an article once about disconnecting OEM battery charge feature on T-1550 Sunline and using aftermarket (battery tender) smart charger to eliminate worry about boiling water out of battery. Mine ,OEM, keeps a charge of 13.6-13.8 v. will this charge be OK, and just check water level every 30 days or so? what do you guys think? thanks.

tmar04 is offline   Reply With Quote
Old 02-04-2011, 05:11 PM   #2
JohnB's Avatar
Join Date: Nov 2006
Location: Ohio
Posts: 12,485
SUN #89
JohnB is on a distinguished road
Hi Tmar04

What year/brand/model converter do you have?

13.6 to 13.8 is normal charge mode. If it never drops down to the 13.25 volt area (float mode) once fully charged, then yes you can and will over charge the battery and in doing so boil off excess electrolyte.

Your converter may take a long time to recharge the battery. Long time can be 1 to 2 days pending how big a battery and how drained it was. But after that it should be dropping down to 13.25 float mode unless your using more battery power again. If after 3 days it is still on 13.6, then you should manually stop the charging.

And yes a battery minder that has desulfate mode on it will keep the battery maintained, desulfated and at 100% state of charge when not in use. I have used this brand with good success.

BatteryMINDer® Plus 12 Volt 1.33 Amp Charger-Maintainer-Conditioner (Desulfator) | All | Battery Chargers by

Searching for them on the web you can get that model for about $40.

Hope this helps


PS Just make sure you do not run the Battery Minder on the battery at the same time the converter is on. It is one or the other, not both.
Current Sunlines: 2004 T310SR, 2004 T1950, 2004 T2475, 2007 T2499, 2004 T317SR
Prior Sunlines: 2004 T2499 - Fern Blue
2005 Ford F350 Lariat, 6.8L V10 W/ 4.10 rear axle, CC, Short Bed, SRW. Reese HP trunnion bar hitch W/ HP DC

Google Custom Search For Sunline Owners Club
JohnB 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
Battery Charger dryflie Sunline Travel Trailers 6 06-05-2015 08:07 AM
How to turn off converter charger RUSKEY Repairs and Maintenance 13 03-14-2013 05:23 PM
A better battery charger quaddriver Modifications 10 10-26-2010 04:16 AM
Converter/Charger upgrade Lost Hunter Modifications 5 08-07-2010 05:14 PM
Battery Charger Mr Tweety Sunline Community 22 06-10-2009 10:22 PM

» Featured Campgrounds

Reviews provided by


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

All times are GMT -6. The time now is 02:47 AM.