I have several audio authority power supplies.
These are great for demo-ing @ shows, or just testing equipment. I use one to run the entire demo board @ shop
When we go to shows and events we take one of these along and hook up a demo car (full of custom audio and A/V) to it and run it all day without motor running. This is ideal for in shop use. Bench test amps, show off display cars or just demo w/o engine running.
hook up some leads with large alligator clips and directly to your batt, or wire it directly to equipment to be demoed.
These are dependable units with an excelent track record.
I am asking $180 shipped only 1 left