Depends how you define "LOW" I suppose, but I doubt the idle power is more than a 100W.

Yes. Idle will be closer to 10W, if that.

 

+1 on camping solitude.

Just to note, that's a good change over switch. I'm using the SPST versions as a battery isolation switch for my two 5120Ah banks.

View attachment 316781

Make sure the swirch is break before make.

 

An 800 watt power amp uses an inverter to provide the higher voltages required to deliver that much power. AND that inverter draws a fair amount of current when the amp is not even delivering any sound. The current is higher at full output but it is never "LOW."

Chances are, the amp is using a switching power supply, so the idle current is really low.

 

Chances are, the amp is using a switching power supply, so the idle current is really low.

And - a digital amp. Super efficient.

 

Make sure the swirch is break before make.

If you want something really robust use this brand.
https://www.bluesea.com/products/category/11/Manual_Battery_Switches