Car currently just has the stock oem battery. I don't want to add another battery to the vehicle.
System consists of Alpine DD headunit, MiniDSP 8x12, and two Arc Audio 4150xxk amps with all channels @ 4ohms. So not looking for window shaking volumes, just SQ demos and for being judged at indoor competitions.
I use a Battery Tender Jr, which caps out at 500ma output, while tuning in the garage. That seems to work fine for that but after a couple hours the voltage started to get low. So I need something more - something that will last at a 2 day indoor event (SVR) where the engine must remain off. I'm looking to use some things I already have to accomplish this.
I currently have an old Optima Blue Top (deep discharge + starting) battery that is in very good condition. I also have a industrial brand 12vdc/12a power supply with adjustable output voltage (11-16vdc).
So, I was thinking of just connecting the optima battery and the power supply in parallel to my vehicles battery. I could use 4ga cables to connect it all up.
Would this set up work? I'm not sure where I should set the output voltage on the PS?