Plz somebody, just a few general Prius electrical questions...

So, just having a little streak of paranoia here...

I'm fixing to upgrade my stereo with a modest sized 5 ch amp. Depending on which amp I decide on, it will probably be fused between 50 and 90 amps.

What I need to know is, with my 2019 Prius LE, if I were to be parked, and listening to my stereo.... and maybe with the heater or AC running too, where does the juice come from for the amp ? I mean obviously, if it could be taken from "the big battery" their wouldn't be any problem. In fact, maybe then Id consider 3 x 10,000 wt, 500 amp amplifiers lol JK.

Anyway, how does this work in a Prius ? Or for that matter, for any hybrid car ?
Obviously I don't want to screw anything up. The car audio place I'm dealing with, is a large, reputable place, and when the owner walked and and saw my car, he didn't have any problem with my request. He just asked, "Is this a 2019" ? Then said, sure. That wont be a big deal...

PS, I'm sticking with the stock head unit for now.... and even with the stock mids and highs, until when, and if I blow them I actually think they sound good (depending on the music source) ....and when they are not struggling to make bass, which they will not be here shortly.
I will mostly be playing MP'3's from a flash drive + I think I am going to go on and get Sirius XM....

 

Okay, so of course you know that even if my amplifier ran a 90 amp fuse, theoretically, it should not be actually drawing anywhere close to that continuously, on a regular basis. Probably more like 30 amps, with 50 amp peaks. Seems like this should be okays then, huh ?

 

Well, I'm not sure if this is a good thing.... but I already sit in my car "A LOT" with my car in the ready mode, running the AC or heater, stock stereo playing, charging a couple phones, etc. I do ride share, so a lot of time sitting, and waiting.

Oh but here's a BIG question !?!? So, say I'm sitting and waiting, heater or AC on + my upgraded stereo playing, with the car in the ready mode > Will the car know when the 12 volt system is getting low, then fire up the gas motor automatically, to charge the 12 volt battery back up ? I mean, it does this now, for the stock stuff.... but will it do the same after upgrading the stereo system ?

 

Awesome I think we were typing at the same time lol

 

Awesome
I don't remember all the details, or what hybrid or all electric vehicle was being talked about.... But some car audio gurus, over on another forum were talking about running a 30K watt system off of the main battery... I believe with some sort of converter or something, and they said even as rediculous as that system was, the cars battery would barely feel it, and that it could play for hours ? Hmmm...