3 Amps on single battery ?

I think I might've found what I'm looking for to finally replace factory sounds. I'm going to replace all the doors and put a 800-1,000 watt amp on those. Also I'll have an amp powering the center console style box the sits over rear seats that houses either dual or single sub (haven't decided on that yet). Then I'll have a sub behind the seats on a monoblock amp.
Can I push all of this with single battery ? I know I'm going to need dual battery setup once I begin to retrofit and add light bars. But will I be ok for now ?

 

800-1000 RMS or Max - because that will make a huge difference (although I assume that's max).

Look at the total RMS power - if you are around 1000=1200 watts total RMS you should be fine on a single battery. It will depend on how loud you play it, the brand of amp (some draw much more power than others), how it's wired, what your gains are set at, etc. Toyota vehicles typically do fine with adding 1 or 2 amps on the factory alternator/battery.

 

1000 watts max on doors
1200 watts max on single
And haven't decided on what subs will be in console style box yet so not sure on amp size