Some advice please.

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Micky Savage - 06 Oct 2008 09:26 GMT

Hi Group,
I have been asked to install a 12v dvr and bullet cam in a taxi, ( modern
saloon car). My questions are:- 1 How do a get a power supply to this system
without causing the battery to go flat at night? and 2:- Will I mess the the
cars computer management system up if I disconnect the battery to connect
the system. I have sorced a system from my supplier in Hong Kong, but I know
nothing about car electrics.

Thank you.
Kind Regards,

Micky. Leeds U.K.

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Robert L Bass - 06 Oct 2008 10:49 GMT

> Hi Group,
> I have been asked to install a 12v dvr and bullet cam in a taxi, ( modern
[quoted text clipped - 3 lines]
> the system. I have sorced a system from my supplier in Hong Kong, but I know
> nothing about car electrics.

Connect the DVR to a switched power that's only on when the ignition is either
in the "on" or "accessory" position. With the key out the DVR will not draw
power. Disconnecting the battery won't affect the car's computer.

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Regards,
Robert L Bass

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DIY Alarm and Home Automation Store
http://www.bassburglaralarms.com
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Andrew Gabriel - 06 Oct 2008 12:34 GMT

> Disconnecting the battery won't affect the car's computer.

It can, but it's not a disaster. Often the EMS will 'forget'
the tuning information it has learned. The first 5-10 miles
afterwards it needs to relearn the optimum engine tuning,
and it may run a bit rough whilst that's happening.

Also, make sure you have keycodes for anything such as the
radio, which you'll need to re-enter.

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Andrew Gabriel
[email address is not usable -- followup in the newsgroup]

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Petem - 06 Oct 2008 15:48 GMT

"Micky Savage" <excaliber333@yahoo.co.uk> a écrit dans le message de groupe
de discussion : kZadnaabIo9fVnTVnZ2dnUVZ8jidnZ2d@bt.com...

> Hi Group,
> I have been asked to install a 12v dvr and bullet cam in a taxi, ( modern
[quoted text clipped - 8 lines]
>
> Micky. Leeds U.K.

If the dvr will restart recording with out any manipulation afetr a power
shut down, you can connect your supply to the dvr and camera to the battery
and cut it by a relay strong enough to support such current , this relay
should be controled by the accessories output of the car so that when the
car is not running no power goes to the dvr/cam.

be carefull with the volatage going to the bullet cam, seen some of those
get pretty hot if the power is close to 14 volts and up!

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Matt Ion - 06 Oct 2008 16:00 GMT

> be carefull with the volatage going to the bullet cam, seen some of
> those get pretty hot if the power is close to 14 volts and up!

Good advice there: most cheap 12VDC bullet/board cams don't do well with
over-voltage, and your car's electrical system can put out up to 15V.
Might want to look into adding a small regulator board to its power (the
DVR should be a lot more robust running straight off the car's power).

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Homeowner Forum / Security Alarms / October 2008

Some advice please.