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Open Roads Forum  >  Travel Trailers  >  General Q&A

 > Low Battery Voltage

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Mr. C

SW Virginia, USA

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Posted: 06/29/22 06:27am Link  |  Quote  |  Print  |  Notify Moderator

2020 Keystone Cougar 26RBS. After a 4hr trip home, low voltage prevented the slide from opening. The fridge was running during the trip. Plugged in and opened the slide. The next day I had the battery tested and it's fine. I verified that the truck charges the battery. Yesterday, with battery at 13.6, I unplugged. Fridge was running. This AM, 6.3 volts.

What direction do I need to head? Only the fridge and propane detector were running on the battery.


2020 Keystone Cougar 26RBS "Pressure Relief 4"
2017 Silverado LTZ 6.2 4x4

MM2 USN 1970-75
USS Canisteo AO-99
USS Miller DE-1091



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"Knowledge is good". Emil Faber


WayneAt63044

St. Louis, MO

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Posted: 06/29/22 07:36am Link  |  Quote  |  Print  |  Notify Moderator

Do you have a 12 volt compressor refrigerator? If so, what is the power consumption vs. the battery specs? Just one battery?


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MFL

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Posted: 06/29/22 07:36am Link  |  Quote  |  Print  |  Notify Moderator

If plugged in and showing 13.6, does not mean battery was fully charged. However if battery showed only 6.3, after just being unplugged overnight, with minimal draw, I'd say you need a new battery.

Did a competent person load test your battery, and say it was fine? Unless your battery has been abused, often times allowed to drop to 50% or less, it should have lasted more than two years.

A four hour trip should have charged the battery some, but if very low to begin with, not enough to operate the slide on it's own.

I'd have it load tested again, as it should not drop to 6.3 overnight. I think you will be needing a new battery.

Jerry





enblethen

Moses Lake, WA

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Posted: 06/29/22 07:59am Link  |  Quote  |  Print  |  Notify Moderator

Check the DC distribution panel for battery voltage with shore power disconnected and tow vehicle disconnected. Possible that the charge line from TV is not providing power. Possible that battery fuse in distribution panel blown.


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Lwiddis

Southern California :(

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Posted: 06/29/22 08:21am Link  |  Quote  |  Print  |  Notify Moderator

An RV battery or batteries drawn down to 6.3 volts is toast. You have an issue, yes, but buy new batteries when solved.


Winnebago 2101DS TT & 2022 Chevy Silverado 1500 LTZ Z71, WindyNation 300 watt solar-Lossigy 200 AH Lithium battery. Prefer boondocking, USFS, COE, BLM, NPS, TVA, state camps. Bicyclist. 14 yr. Army -11B40 then 11A - (MOS 1542 & 1560) IOBC & IOAC grad


StirCrazy

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Posted: 06/29/22 08:23am Link  |  Quote  |  Print  |  Notify Moderator

Mr. C wrote:

2020 Keystone Cougar 26RBS. After a 4hr trip home, low voltage prevented the slide from opening. The fridge was running during the trip. Plugged in and opened the slide. The next day I had the battery tested and it's fine. I verified that the truck charges the battery. Yesterday, with battery at 13.6, I unplugged. Fridge was running. This AM, 6.3 volts.

What direction do I need to head? Only the fridge and propane detector were running on the battery.


put your fridge on propane, and get new batteries. if you ran it down to 6V its toast. I am saying to put your fridge onto propane as when I looked up your model it saud propane/electric fridge so I am asuming you have a 2 or 3 way.

Steve


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2016 Cougar 330RBK
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enblethen

Moses Lake, WA

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Posted: 06/29/22 08:51am Link  |  Quote  |  Print  |  Notify Moderator

OP: You say "battery". Do you have only one?
What size is the battery you have in the rig? Is it 12 volt or do you have a pair of six volters? If six volters, they are wired wrong

klutchdust

Orange, California

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Posted: 06/29/22 08:53am Link  |  Quote  |  Print  |  Notify Moderator

Lwiddis wrote:

An RV battery or batteries drawn down to 6.3 volts is toast. You have an issue, yes, but buy new batteries when solved.


So if a battery gets discharged to that point it is no longer usable, even if recharged?
I had a battery that was dry, sitting in the garage zero charge in it. I filled with distilled water, trickle charged it for a few days and it went back in service with no issues. A load tester can be had at HF that is equal to or as good as any I have ever used and will give you accurate analysis of the batteries condition.

Mr. C

SW Virginia, USA

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Posted: 06/29/22 08:58am Link  |  Quote  |  Print  |  Notify Moderator

The battery was tested at Advance Auto Parts. They said it had more than the stated CCA. Battery is the original/3yrs old. The fridge has been running on propane. I will have the battery retested somewhere else, and will hook up a different battery and retest. Hoping it's just the battery and not something else.

I have verified that the TV is charging the battery, and this is reflected on the InCommand screen.

pianotuna

Regina, SK, Canada

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Posted: 06/29/22 09:07am Link  |  Quote  |  Print  |  Notify Moderator

Mr C,

How many amp-hours is the battery?


Regards, Don
My ride is a 28 foot Class C, 256 watts solar, 556 amp-hours of Telcom jars, 3000 watt Magnum hybrid inverter, Sola Basic Autoformer, Microair Easy Start.

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