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Old 05-10-2013, 02:09 PM   #1
raf0405's Avatar
Join Date: Apr 2013
Location: Farmington, MN
Posts: 35
Battery Draw

Earlier this month I purchased a Damon Intruder. It has been sitting for a couple of weeks now and when I checked the battery voltage it read 11.9. I think this is down from 12 something when it is fully charged. I thought the in-out service switch would disable all batteries, starting and house (2) batteries. I did notice that the analog clock in the dash was running. If this clock is running off the starting battery how far can a battery be down and still be able to start the RV.

Thanks for any help or thoughts.

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Old 05-10-2013, 02:16 PM   #2
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Location: Lake County, IL
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Even on a battery with absolutely nothing connected, there will be a certain amount of internal, self discharge. You probably want to use a trickle charger. batteries - How do I calculate the self discharge rate of a lead acid battery? - Electrical Engineering Stack Exchange


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Old 05-10-2013, 02:29 PM   #3
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Location: Farmington, MN
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Thanks for the fast reply. My previous RV would sit all winter, five months, and start right up again in the spring. I never removed or did anything to the batteries in nine years. If this clock is the only thing drawing down the battery it needs to be disconnected.
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Old 05-10-2013, 02:53 PM   #4
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Location: Cincinnati
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I'd suggest you disconnect the battery ground cable and put a multimeter into the circuit to measure current draw. Often computers, radios, clocks, other devices still draw power to maintain memory settings. Even with chassis and house disconnects, I have battery terminal knife switches on my batteries to be sure nothing is drawing them down.

Bob & Donna
'98 Gulf Stream Sun Voyager DP being pushed by a '00 Beetle TDI
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Old 05-10-2013, 03:03 PM   #5
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Thanks I'll check that out. I just find it hard to believe that they would install a clock that would draw all the time
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