How to install additional 12V battery to run security systems

[ElectricalNewbie]

You would need to work out what extra security equipment you are going to use and then find a battery or batteries that can be hidden within the vehicle and supply that load for upto a few days or possibly a couple of weeks it may also be worth installing a battery monitor that can report the battery status when getting to a critical voltage. A VSR works in a similar way to a split charge setup but is easier to wire

Thanks, I’ve looked in to the prospect of adding a tracker. The FMT100 looks simple and acceptable. On the manufacturers website it offers the information below on consumption. Based on this, if I were to use a small, compact motorcycle 12v battery of say 6Ah, connected via a VSR, does that sound a sensible setup?

Power consumption

At 12V < 1.47 mA (Ultra Deep Sleep) At 12V < 3.21 mA (Deep Sleep) At 12V < 3.75 mA (Online Sleep) At 12V < 5.48 mA (GPS Sleep) At 12V < 24.41 mA (nominal)

 

[plugsandsparks]

Thanks for your response, this sound feasible. Would you be able to explain in a little bit more depth roughly what components would be required and how they would be connected? From a little bit of reading I’m thinking using a VSR to connect the second battery and connect the additional security direct to the second battery. Does that sound correct?

Post up the product you have in mind and a wiring diagram, can comment then

 

[ElectricalNewbie]

Post up the product you have in mind and a wiring diagram, can comment then

This is the tracker:

FMT100 - 2G Bluetooth Insurance GPS Tracker | Teltonika Telematics

2G Bluetooth easy mounting GPS tracker FMT100 with precise crash detector for UBI and SPECIAL fleet management applications

teltonika-gps.com

This is the VSR:

12V Voltage Sensitive Relay - 140A | 072733 Durite - Leaders in Vehicle Safety & Auto Electrical Parts | Durite.co.uk

Product Description and Specification for 12V Voltage Sensitive Relay - 140A | 072733

www.durite.co.uk

And this is the sort of battery I was considering:

12V 7Ah Toy Car Battery

High performance mobility scooter and wheelchair batteries at low prices. Designed to cope with modern day demands. Also Ideal for other traction applications like toy cars and electric motors. Other references: FR2:LB352623, 6 DZM 7, 6DZM7, DJW127, UL7-12, DJW12-8HD, DMU12-7.6, DMU12-8...

www.tayna.co.uk

And this very simple diagram I’ve pinched off of the internet was my plan. Connecting the VSR where is says battery isolator and the tracker where it says amplifier. With an inline fuse either side of the VSR. What do you reckon?

 

[plugsandsparks]

Like it, only issue i can see is how many days you need out of it. I see one week in winter probably maybe 10 days in Summer.

 

[ElectricalNewbie]

Like it, only issue i can see is how many days you need out of it. I see one week in winter probably maybe 10 days in Summer.

Thanks, really appreciate your help. I may look at alternative batteries of a similar size but with a greater Ah rating for the reason you state.