Amplifier power vs power draw

[s1962a]

I am a bit confused about what mains power draw an amplifier would have, if I know it's rough max/rms output. So if an amplifer says 1300 watt max, does that mean it will potentially draw 1.3kw from the mains? Like a kettle for example.

The reason i'm asking is i'm trying to work out the power requirements for an off grid amp/speaker setup where no mains power is available, but using those 240v lithium battery packs. If i had a 250w battery pack, could it power a 1300 watt amp and speakers?

[s1962a]

Thanks for the info

So the deal is that there is a local club that wants to have a socially distanced meeting in the park or other open space (no idea how that works with the rule of six). My job is to find out how to run 1 or 2 PA speakers to play some music / use microphones etc.

Doing some research, I can either go for 12v battery speakers - something like this which you just charge up

https://www.gear4music.com/PA-DJ-and-Lighting/SubZ...

But in case the batteries dont last very long or more power is needed I was looking into proper powered speakers with an inverter type setup, or one of those lithium battery packs. But the speakers are quoted as 1000w so I dont know if i can power them from a 250w or 400w power bank. Ideally speakers should be powered at maybe half volume for 4 or 5 hours in one go.

Speakers with built in amp
https://www.gear4music.com/PA-DJ-and-Lighting/Mack...

Power Bank
https://www.amazon.co.uk/POWEROAK-Generator-220V-2...
https://www.amazon.co.uk/UKing-Generator-60000mAh-...

Cheers