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.

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

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

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.

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

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

Low Battery Voltage | Good Sam Community

valhalla360
Navigator
Jul 01, 2022
Mr. C wrote:
valhalla360 wrote:
Mr. C wrote:
OK. Regardless of all of this, I'll be getting a new battery. Went to Harbor Freight and got a cheap load tester and a CenTech 30a Circuit Tester #67724. Also cheap. It replaces the fuse and reads the amperage. I could get the battery to read bad if I kept the load on for 10sec. Interstate RV/Deep Cycle. 405CCA, 505MCA.

Fridge circuit .8-1.3
Propane detector circuit .2
The TV antenna is on one of the circuits and can't be turned off like in our last camper.

Converter voltage 13.6

Voltage at the truck plug 12.6

So, is the AGM battery worth the extra $100 compared to a flooded battery?

When parked at home, the camper is always plugged in. Good or bad? Or should I just use a battery tender?

Thanks for the input and help...

The AGM offers nothing in your situation (one battery-rarely off grid). More importantly, until you are sure there isn't a systemic problem, no chance burning up a more expensive battery.

Can I assume that the amp readings on those 2 circuits are normal? All other circuits were 0...

Yeah, that sounds fairly normal. What was the amperage direct off the battery terminal (this should include everything)? If it's 1-2amps, there's no major hidden draw.

Overnight (say 14hrs), that should be 14-28amp-hrs, which shouldn't kill a fully charged battery in good condition. (It might be down to 60-70% by morning but certainly not 6v which is beyond dead).
Mr__C
Explorer
Jul 02, 2022
valhalla360 wrote:
Mr. C wrote:
valhalla360 wrote:
Mr. C wrote:
OK. Regardless of all of this, I'll be getting a new battery. Went to Harbor Freight and got a cheap load tester and a CenTech 30a Circuit Tester #67724. Also cheap. It replaces the fuse and reads the amperage. I could get the battery to read bad if I kept the load on for 10sec. Interstate RV/Deep Cycle. 405CCA, 505MCA.

Fridge circuit .8-1.3
Propane detector circuit .2
The TV antenna is on one of the circuits and can't be turned off like in our last camper.

Converter voltage 13.6

Voltage at the truck plug 12.6

So, is the AGM battery worth the extra $100 compared to a flooded battery?

When parked at home, the camper is always plugged in. Good or bad? Or should I just use a battery tender?

Thanks for the input and help...

The AGM offers nothing in your situation (one battery-rarely off grid). More importantly, until you are sure there isn't a systemic problem, no chance burning up a more expensive battery.

Can I assume that the amp readings on those 2 circuits are normal? All other circuits were 0...

Yeah, that sounds fairly normal. What was the amperage direct off the battery terminal (this should include everything)? If it's 1-2amps, there's no major hidden draw.

Overnight (say 14hrs), that should be 14-28amp-hrs, which shouldn't kill a fully charged battery in good condition. (It might be down to 60-70% by morning but certainly not 6v which is beyond dead).

1.1-1.2amps at the new battery, measured with my new DCa clamp-on meter. Also have a new battery tester and a new 12v circuit tester. All good things to have, and it took a simple problem for me to get them. I'm glad it was just the battery all along.

Forum Discussion

Low Battery Voltage

About Travel Trailer Group

Related Content

Low Shore Voltage

One low battery

Power converter putting out too low of voltage

Battery Control Center solenoid dropout voltage

Checking voltage on connected 6 volt batteries