Amplifier amperage limits for Prius?

That will work fine. The peak demands by that gear will be close to the car's limits, but that's fine because it's only the peaks. The long term average draw will be much lower, well within what the Prius can supply. Just make sure you tap in on the load side of the shunt so that the car is properly aware of this extra load.

I might suggest that you replace your 12v battery somewhat more often because it is on the small side. So instead of letting it go 4-5 years maybe replace it every 3rd year or so. Even that may be overkill.

 

Hi. What is meant by the load side of the shunt. I'm looking to put a sub in to my car. The system I'm wanting to put in is a 600w rms alpine type r sub and an 800w rms amp l. Will this be enough for the 12v battery to handle.

 

Not sure if your Prius is built the same way as the US-spec models but take a look at your 12v battery. You may see a large plastic insulator assembly on the + terminal of the battery, and if it's like the US cars that contains a sensing shunt. Make your connection to the terminal on the far end of that plastic assembly, it (probably) faces the front of the car.

Good luck!