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in car surveilance and current draw


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t&t tech 
Platinum - Posts: 2,601
Platinum spacespace
Joined: October 05, 2008
Location: Trinidad and Tobago
Posted: June 11, 2013 at 9:01 AM / IP Logged  
Company i wrk for,is giving me this systen to install into cars for live monitoring, the system is designed to be active and recording constantly, my concern is battery current draw when the car is parked for extended periods, haven't gotten the specs on current draw for the system, but was told by manangenent it's approximately 800 milliamps total.
Can i get an input on this current draw??
oldspark 
Gold - Posts: 4,913
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Joined: November 03, 2008
Location: Australia
Posted: June 11, 2013 at 10:04 AM / IP Logged  
10W. ie, a dome 10W light; 20 LEDs, etc.
t&t tech 
Platinum - Posts: 2,601
Platinum spacespace
Joined: October 05, 2008
Location: Trinidad and Tobago
Posted: June 11, 2013 at 10:48 AM / IP Logged  
Effects on a battery after let's say a 24 hour period.
oldspark 
Gold - Posts: 4,913
Gold spacespace
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Location: Australia
Posted: June 11, 2013 at 5:23 PM / IP Logged  
A piece of string has a length exactly twice the distance from its centre to one of its ends...
It depends on the vehicle and battery. Some vehicles could be hard to start - especially with older batteries.
And if there are other drains like alarms etc...
The effect will be about twice as bad as a 500mA alarm.
Daily or maybe even weekly engine running (with a ~14.2V alternator and sufficiently long run) should be sufficient to reverse battery sulfation.
Maybe consider a low voltage cutout (battery protector) - even if a 2nd battery is used.
i am an idiot 
Platinum - Posts: 13,666
Platinum spaceThis member consistently provides reliable informationspace
Joined: September 21, 2006
Location: Louisiana, United States
Posted: June 11, 2013 at 9:09 PM / IP Logged  
800 milliamps is a lot of draw. A typical Bosch/Tyco relay draws 160 milliamp. An improperly installed starter kill relay will flatten a battery if the car is not driven daily. 800 is 5 times as much as one of these relays. I am not thinking this is going to go well.
howie ll 
Pot Metal - Posts: 16,466
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Joined: January 09, 2007
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Posted: June 12, 2013 at 12:31 AM / IP Logged  
You'll have a flat battery every morning.
Make it ignition or acc switched or alarm triggered.
howie ll 
Pot Metal - Posts: 16,466
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Posted: June 12, 2013 at 12:32 AM / IP Logged  
Peter, the average alarm R/S draws 40-60 mAmps.
oldspark 
Gold - Posts: 4,913
Gold spacespace
Joined: November 03, 2008
Location: Australia
Posted: June 12, 2013 at 1:58 AM / IP Logged  
Yeah, my bad - out by a factor of 10 but keen to show the non-linearity of battery discharge current to capacity - ie, 800/500mA = 1.6 but it probably has a 2x effect on remaining capacity.
I recall my concern when I left my 10W dome light on overnight when snowboarding. I realised the mistake in the morning when I looked out the window and noted the melted rectangle in the centre of the snow covered roof. Being colder conditions than normal (ie, less battery capacity than its normal 10-20C winter abode) and at the bottom of a long steep drive I was relieved when the beast started normally.
But 24 hours in any climate with that 10W (~800mA) load would have left that car unstartable. (Now having a reduction starter and electronic ignition I could probably survive 2 or more days.)
Funny that I should have considered 500mA for an alarm - you probably know how critical I am about even the 12mA draw of 1980s-1990s Bosch S&L alternators, let alone 40mA alarms and 200mA relays.
My recent Alpine drain of 120mA was enough to make starting difficult after ~4 days.
But 800mA for a car surveillance system...! Ok maybe for a truck (24V thru a converter), but typical 12V vehicles - what would they do over weekends?
Such high-current surveillance should only kick in after the triggering of proximity detectors etc.
howie ll 
Pot Metal - Posts: 16,466
Pot Metal spacespace
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Posted: June 12, 2013 at 5:12 AM / IP Logged  
The tracker I use for fleets draws 3 yes 3 mAmps at rest and 15 on data send.
howie ll 
Pot Metal - Posts: 16,466
Pot Metal spacespace
Joined: January 09, 2007
Location: United Kingdom
Posted: June 12, 2013 at 5:13 AM / IP Logged  
Darren, take one live it up and measure it.
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