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How to pick best battery for amplifier?

Hello, I ordered this amplifier and I need to pick best battery for this amplifier. Would be great to power it for at least 3-4 hours on maximum volume (200W rms subwoofer and 2x50W rms speakers). I need lightweight battery and powerful battery, size does not matter, budget is low so nothing overpriced I do not want.

For max volume on this setup you need close to 1kWh coming from a 24V battery - that is without the voltage breaking down with the charge going lower.
Would have been better to select an ampd that runs on 12V.
Still easier to build a generator with an old lawm mover and alternator, and cheaper too.
Batteries must be huge and deep cycle, so nothing on the cheap for this kind of power.

RobertasP4 (author)  Downunder35m19 days ago

Hmmmm... U thought about connecting 2x 12V 7Ah batteries, but I don't know how long it would last. :/ Or maybe connect a bunch of 18650 li-ion. It's because I don't know how to calculate how long will last my battery. :/