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Old 05-03-2013, 12:51 PM   #4
FlyWright
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City: California Delta
Vessel Name: FlyWright
Vessel Model: 1977 Marshall Californian 34 LRC
Join Date: Apr 2008
Posts: 13,728
Tim, I just completed the install of two ER cameras last weekend and did exactly what you're describing. I had a home security system that had a failed DVR power supply. I trashed the DVR but kept the cameras.

Since they were 12V, I discarded the 110V wall wart and wired them through a 3 A fuse directly to a 12V power buss in my overhead panel. I wired the feeds through a 4-source video selector switch to my HDTV. I used low light cameras which give a surprisingly clear black and white display of the ER without ER lights. When I turn on the ER lights, they display in color.

I agree that the 500MA max on the wall wart is the max output of that power supply, not the max of the cameras. They will pull much less than that, but will only pull what they require. I don't even see mine on my battery monitor.
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