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No Matter which system you choose- be sure to include a voltage monitoring system ( like a simple volt meter and switch) to keep you informed on what is happening with the batteries.
Most of the described DB systems will work under normal use - where certain systems shine is when you need the power in the most demanding situation.
Turning a switch is not the end of the world - setting up a complete manual switch system requires little effort to use .
I have two HR systems in seperate vehicles - they have never let me down so far in 1.5 years -
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