Alright, took me a while to get back home to respond. So here we go.
MorganS:
But you don't have the entire thing on maximum-brightness-white for the entire hour do you? That's why I asked about the duty cycle. If it's on 75% brightness but flashing half the time off and half on and then it only gets to 100% for a minute at the big finale, then you only need 37A of continuous charging capability. The car battery can supply surges of hundreds of amps for several minutes when required.Or think about it another way: the 50Ah battery will be flat after 1 hour but at the same time you add the 50A charger for 1 hour. This gives you 100A for 1 hour. $45 plus a battery sounds cheap to me.
Definitely not at full brightness all the time. The LED strips color and value are synced to the music. It doesn't follow a pattern though. Each track has it's own orchestrated lighting show controlled my the music software. I'd probably need to have appropriate overhead though, don't I? I'll actually be dividing the LED wall into 4x sections and running them off their own 30A power supplies. This way I just need 3x more 30A power supplies.
dc42:
I suggest you use 24V led strips, which will need up to 60mA per 6 LEDs. Then the maximum current will be 16.8A which is much more manageable. You can buy a 24V 450W PSU off the shelf.
Never seen those whenever I googled for led strips. Will look into that. Are they any brighter than the 12v ones?
Southpark:
I'm thinking.....will the mains board allow for 100 amp? Maybe the bar and club switch board will allow it.
Most certainly not if I run them at full white at all times. I'm sure it can handle occasional peaks or short bursts of white.