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Old 07-13-2020, 04:04 PM   #1
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2020 16' Caravel
okatie , South Carolina
Join Date: Jul 2020
Posts: 1
Batteries rapidly discharging

I just bought a new Caravel 16 with 2 Interstate Deep Cycle 80AH batteries. Charging them with shore power shows 13.4v on the meter in the camper, reducing to 13v after several hours. When fully charged and unplugged from shore power it shows 12.7v. Then, with EVERYTHING turned off (except the battery kill switch) (no refrig, water pump, fan, light, etc.) it goes to 12.1v within 36 hours; basically almost fully discharged. I took the batteries to an Interstate dealer who checked them and said they are ok. Any ideas of what could be causing the discharge? thanks

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Old 07-13-2020, 07:20 PM   #2
Rivet Master
1986 31' Sovereign
Miami , Florida
Join Date: Feb 2004
Posts: 2,341
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You have a ghost load. The propane detector is probably on all the time but that is a fairly tiny draw. The control boards for the reefer and the hot water heater draw a little. If you have a powered subwoofer, that is a bit of a power hog. Bottom line, if you canít leave it plugged in, you. Need a to pull a battery lead or install a battery switch.

A fully charged lead acid battery should read 12.6 volts at rest (it will read higher just after charging). 12.2 is pretty much as low as you want to go without shortening its life.

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Old 07-13-2020, 07:40 PM   #3
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2018 25' International
Slidell , Louisiana
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Just to add a bit more info, we can figure you used about 45-50% of available power based on your description so let's say 80Ahr. 80/36 is about 2.2 Amps. My rig on shore power uses about 0.8-1.0 amps to run all the always on passive things, so as n2916s indicated you may have maybe a 1-1.2 amp phantom load. The inverter generally draws about .7 in standby, check that. Perhaps a light or two in one of the compartments. 2.2 amps seems a touch high for all the passive loads.
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