I have a 350watt Radio Shack Power inverter and want to hard wire it in my Jeep. I will use this while camping to power my CPAP machine (Device that forces air in your nose to help with sleep apnea) I have used this inverter for this before but had it cliped directly to battery in my wifes Kia. I will be hooking this directly to the battery. Do I need to install a switch inline to turn this power on and off before the inverter, or can I just use the on off switch on the inverter?