Acceptable battery drain. - Team Camaro Tech
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post #1 of 5 (permalink) Old Jan 12th, 08, 11:08 PM Thread Starter
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Eric
 
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Location: North Carolina
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Acceptable battery drain.

I have a 1995 GMC full size pick-up that is having a battery problem. I don't drive the truck all the time, and when it sits the battery will go dead after a week or two. The only modifications to the electrical system are an electric trailer brake controler and an aftermarket stereo system. I replaced the battery with a Exide spiral cell battery, very similar to an Optima, because acording to Exide these batteries are supposed to tollerate long term storage without losing thier charge. Before I take this battery back to the store I want to be sure it's not my truck. We all know that a modern car will never have absolute zero current flow due to things like stero and computer memory like our Camaros, but how much is acceptable? I show a steady current draw of 8 milliamps with the subwoofer dissconnected, and 48 milliamps with it connected. Would you considder this too much?

ERIC
67 Convertible, 350CID, TKO600RR, 3.73 Eaton Posi
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post #2 of 5 (permalink) Old Jan 12th, 08, 11:55 PM
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Steve
 
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Re: Acceptable battery drain.

Disconnect the subwoofer and see how long the charge in your battery lasts.
If it doesn't drain it, obviously the 48mA is too much.

If the stereo is off, I am surprised that the subwoofer is draining anything at all.

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post #3 of 5 (permalink) Old Jan 13th, 08, 12:07 AM Thread Starter
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Eric
 
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Re: Acceptable battery drain.

Quote:
Originally Posted by BlackoutSteve View Post
Disconnect the subwoofer and see how long the charge in your battery lasts.
If it doesn't drain it, obviously the 48mA is too much.

If the stereo is off, I am surprised that the subwoofer is draining anything at all.
I'm not sure why it has a draw with the stereo off, but heck four hundrethes of one amp sure doesn't sound like much. I was trying to remember the math for calculating how long the battery will last at a given load acording to its reserve capacity. Anybody have that one off the top of thier head???

ERIC
67 Convertible, 350CID, TKO600RR, 3.73 Eaton Posi
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post #4 of 5 (permalink) Old Jan 13th, 08, 01:13 AM
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Re: Acceptable battery drain.

um, 8 milliamps is amazing, 48 is right about the acceptable limit (we used 50 mA) we used to use where I worked.
I would install some kind of disconnect on the power for the subwoofer or get a new amp that draws less power when its off
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post #5 of 5 (permalink) Old Jan 13th, 08, 04:16 AM
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Re: Acceptable battery drain.

Quote:
Originally Posted by ept000 View Post
I'm not sure why it has a draw with the stereo off, but heck four hundrethes of one amp sure doesn't sound like much. I was trying to remember the math for calculating how long the battery will last at a given load acording to its reserve capacity. Anybody have that one off the top of thier head???
Here's a pretty good calculator:

http://www.solarsense.com/Spec_Your_...Run_Times.html

For a 90 a/h battery the time is in the range of 750 hrs @ 50 ma to get to half charge at 50°F. That's about a month.
Get a battery minder or a small charger from Harbor Freight for about $5.
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