Power Inverter to Power Active Speaker

Where do you get 130w max for the powered speakers? They can draw 6.3 amps at 120v which is about 750 watts. That sounds more likely than 130. The mixer probably doesn't draw that much extra.
The inverter you link to is 750w max (if you can believe the spec) which might work but I would suggest getting one with at least 1000w. The modified sine wave output could screw up audio gear so I would suggest you check with Behringer and Xone about that.
You would probably want sealed deep discharge batteries. How many depends on how long you want the system to play and how loud.
 
May 3, 2018
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I got it from the specifications listed for the item. Regarding the batteries, lets say for 3 hours and loudest possible ?