Mate that was a moderate light bar that people had been putting on their roof. Here is
one example. If you want crazy try
this one. 1260 watts ... that's your entire alternator output in ONE LIGHT. You need 0 gauge cable for it.
See, I don't understand why people put 1600W audio amps in their cars, with gold connectors and 0 gauge cabling. 1600W will consume the average Ford Falcon's 70Ah battery completely (assuming 100% charge, and they never are) in under 30 minutes. Ok, so Falcons have a 110Ah alternator, so if you can keep the revs up so the alternator is at peak production, you're only losing 20 amps per hour to the amplifier (and that's not accounting for ANY other electrics, including the rainbow dancing lights mounted under the car, or even the electrics required for running the motor itself (spark plugs don't spark from nothing and the ECU draws too). You get to drive around (at peak revs) for about 3 hours.
But if 1260W isn't enough, and 1600W isn't enough, that's ok.
Here's a 2800W unit. Just in case.
But I wanna know where to buy a 300A alternator, because that's what I'd need to use just ONE of those light bars (233A for the light bar, and about 40A for everything else, including the caravan).
The world is crazy.
Now the wattage quoted might not actually be as high as stated - but when you're looking at this unit or that unit and how you might install it, those are the numbers you have to go by. And I'm not going there!