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Old 12-20-2014, 11:44 AM   #1
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Battery life over night

I'm looking for your thoughts. In a few weeks We will be heading south with our TT. Plan on staying in a Crackle Barrel parking lot for the first night. I checked with them and they said "come on you are welcome to stay" It looks to be in the 30's over night and I was wondering if my batteries would last the night with the furnace cycling on and off. I have two deep cell batteries wired in parallel. Also I will not be un hitching for the night but should I un plug the electric hook up from my TV?

Any thoughts or advice would be appreciated. This will be our first time with no electric hook up.
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Old 12-20-2014, 11:49 AM   #2
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Would help more if we knew what size batteries. With specs.
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Old 12-20-2014, 12:21 PM   #3
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You should't have any trouble. I've dry camped at about the same temps and made it two nights with a pair of group 24's and didn't drop below about 60% charge. Granted, I was very sparing with the furnace..I believe I kept it on about 55 and just dressed warmer and brought extra blankets. Nearly completely recharged after a three hour drive. DO unplug while parked or you could possibly end up with a mostly dead truck battery by morning.
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Old 12-20-2014, 01:05 PM   #4
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Thanks for the feed back. My batteries are the group 24. I'm glad I ask about unplugging the TV. Sounds like we will be fine.


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Old 12-20-2014, 01:31 PM   #5
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We were able to overnight for 2 nights while traveling with a single group 27 battery running the furnace and a CPAP machine (on an inverter). We did drive for 10-11 hours the day between them and started out with a completely full battery.

I do not, however, know how far I drew the battery down. It could be that I went below the recommended charge on it unknowingly.
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Old 12-21-2014, 03:21 AM   #6
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Back when I had only on battery I could not make it one night with the furnace set at 55 and about 35 outside.

Get yourself one of these. It is inexpensive and tells you where your battery (s) are at. You can wire directly to the panel or plug into 12 volt outlet. You can set the alarm so you won't wake up to a dead battery. I set mine at 12.2v

VoltMinder Digital Volt Meter w/ 6 Foot Cord for 12V Batteries: Amazon.com: Industrial & Scientific

I try not to let my bats drop below 12.2volts
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Old 12-21-2014, 05:30 AM   #7
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Quote:
Originally Posted by 1l243 View Post
Back when I had only on battery I could not make it one night with the furnace set at 55 and about 35 outside.

Get yourself one of these. It is inexpensive and tells you where your battery (s) are at. You can wire directly to the panel or plug into 12 volt outlet. You can set the alarm so you won't wake up to a dead battery. I set mine at 12.2v

VoltMinder Digital Volt Meter w/ 6 Foot Cord for 12V Batteries: Amazon.com: Industrial & Scientific

I try not to let my bats drop below 12.2volts
Just remember to unplug after taking your reading. This type of voltmeter has a continuous amperage draw to run the display and measure the voltage.
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Old 12-21-2014, 07:41 AM   #8
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Thanks Herk I have a meter that plugs into the 12 volt outlet that does the same thing without the alarm. Never knew the magic number of 12.2


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Old 12-21-2014, 08:24 AM   #9
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The "Magic Number" is at 50% battery capacity which is 12.1 volts.
Voltage below that number will cause permanent reduction in battery life and recharge capacity.

Excessive depth of discharge is the number one cause of early battery failure. Using the "idiot lights", that number is just when the "G" (good) light goes out and no more. Waiting for the fair (F) light to go out will cause real damage. When the "L" (low) light goes out it is time to buy a new one.
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Old 12-21-2014, 09:14 AM   #10
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Quote:
Originally Posted by Herk7769 View Post
Just remember to unplug after taking your reading. This type of voltmeter has a continuous amperage draw to run the display and measure the voltage.
I don't know how many amps this can pull, can't be to many is my guess. I leave mine plugged in all the time. I would bet my CO2 alarm would pull more. What would be the use of it setting the alarms if you do not keep it plugged in? I have had 1 for 3 years now......
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