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Parasitic draw or normal? Viper v5901


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dorkiedoode 
Member - Posts: 16
Member spacespace
Joined: July 30, 2007
Location: United States
Posted: May 08, 2016 at 11:50 PM / IP Logged Link to Post Post Reply Quote dorkiedoode
The car without the alarm draws 10mA, but with the viper alarm active it draws 50mA.
Is this normal for the alarm to consume an additional 40mA? My dad does not drive the car around a lot but he says he feels a difference when the car starts up.
The car is stock with the v5901 alarm + idatalink bypass module. No additional sensors or features.
2010 Honda Accord EXLV6
dorkiedoode 
Member - Posts: 16
Member spacespace
Joined: July 30, 2007
Location: United States
Posted: May 10, 2016 at 10:00 PM / IP Logged Link to Post Post Reply Quote dorkiedoode
Would anyone have a clue? TIA
davep. 
Gold - Posts: 641
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Joined: May 27, 2011
Location: California, United States
Posted: May 11, 2016 at 11:05 AM / IP Logged Link to Post Post Reply Quote davep.
50Ma over a 24 hour period will consume 1.2 Amp Hours of energy from the battery. Generally, a battery can be discharged ~75% and still start the engine.
Look at the "Reserve Capacity" on the battery. I have a 51R here that is 70 minutes. (51R is a common Asian car size). It will be in "minutes". Convert the minutes to hours by dividing minutes by 60. Ie 70 minutes is 1.2 hours. Multiply the hours by 25 amps = 27.2. This is a 27Ahr capacity at 25 amps load. Because your parasitic load is much less than 25 amps, the battery has more reserve in it at the lower discharge current. With the 70 minute reserve capacity in this example, you should be able to start the car after 2-1/2 weeks. But probably not after a month.
.050 A is not much at all, and is less than many modern vehicles have as OEM. The concern with any car with a parasitic draw is that it is driven frequently enough, and long enough to replenish the battery with the energy lost to the draw. The issue with your Civic is that the battery is not very large. There is not a lot of capacity.
The best thing I've done to deal with this in my cars and trucks I don't drive very frequently is I put them on a Battery Tender if I don't expect to drive or run them in less than a week from when I park it. Battery life has really gone up since I began this strategy 10 years ago. Not to mention I'm more apt to drive them because they always start. No more flat batteries after sitting for weeks.

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