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police lightbar power supply

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Silver - Posts: 564
Silver spaceThis member consistently provides reliable informationspace
Joined: May 24, 2006
Location: New Jersey, United States
Posted: August 17, 2010 at 11:08 AM / IP Logged  
You can build a regulated power supply from an old ATX psu. a 600+ watt psu with a single 12v rail should give you the 40 amps you need. Here are some sites with instructions to give you an idea what it would take to build:
If you don't have an old psu that provided enough current, you can always find them online to fit your budget.
The components can be purchased from online sources like
I have built 1 out of a 200W supply that works well for testing various electronics.
Since you only need a 12V, I would just build it to supply 12V only and insulate all of the other wires and not bother terminating them.
This information is provided only as a reference.
All circuits should be verified with a digital multi-meter prior to making any connections.
Member - Posts: 26
Member spacespace
Joined: April 29, 2007
Location: United States
Posted: September 05, 2010 at 4:32 PM / IP Logged  
Be aware that a "40 amp power supply" usually is only rated for 2/3 of the rated 40 amps for continuous use. So, if you need 40 amps for 30 minutes you better be looking for a 60 amp supply. More money...
I think your cheapest way out is to get a car battery and a charger. Go to a sure nuff battery supplier (not and auto parts store or a big box store) and ask for a reconditioned battery. Chargers can be bought pretty cheap. Get a low output one and use it only for charging, not at the same time as the lightbar is being used.
Joe in Texas
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