Primarily to power my CPAP as I have sleep apnoea. ( 100 amp runs it 2.5 nights)
Run lights when I'm away from the vehicle - not too far though.
My daughter is in the scouts & I sometimes get invited along to camps but vehicles are not allowed at some of the campsites.
I go away once a year in my boat for 3-4 nights on the Gippsland lakes & take a battery out of the 4wd and jury rig up to the boat battery etc. I wont have to do that anymore.
I dont fully trust solenoids, I've had dual battery setups in 5-6 vehicles and have had failures. In the current (no pun intended) Landie I have the spare spare battery on a marine switch & a LED readout.
And finally as its totally seperate from the vehicle I can handle an alternator failure for example.
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