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Author Topic: Second battery for a 2009 Nissan Cube  (Read 5455 times)
W8JX
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Posts: 9701




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« Reply #15 on: Today at 05:04:24 AM »

Investigate the Hellroaring BIC-95150B Battery Isolator.

You can use a simple automotive relay that coil is tied to ignition switch circuit that connects aux battery to altenator when car is running and drops out when off. Cars have been using this setup for over 30 years to power fuel pumps for fuel injection and it is simple, reliable and cheap to implement.
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Ham since 1969....  Old School 20 WPM Extra
KC7YE
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Posts: 133




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« Reply #16 on: Today at 07:44:06 AM »

Running 2007 Subaru Forester : 6 years ago installed deep cycle battery in cargo bay, plugged into to accessory out let back there.Can run 100 w for 3-4 + hours. Battery was a new but blemished Interstate, total investment $75, cheap and still ticking.
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K0BG
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Posts: 10210


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« Reply #17 on: Today at 08:13:10 AM »

You need to be mindful that vehicles with battery monitoring systems, will mark a code if a load it seen that the CPU didn't expect to be there. This is why the B+ to trailer wiring is controlled by the CPU, not by an ignition switch. Whether or not the code turns on the MIL is moot. 
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