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Making a battery pack for an amplifier

Hello, I have a question. I recently bought an amp for acustic instruments Ibanez troubadour 30W, which works pretty good, but only source of power is AC. So, I decided to make a battery pack, I bought a 12V battery for motorcycle and power invertor, which changes from 12v to 230v (but pretty cheap one). It works, but there is a noise, a bit base and when I put the volume up it becomes higher. With this setup I use preamp with 9v battery as well (Fishmann Platinium Stage). Any suggestions for the source of the noise and how could I get it fixed??? Barcelona metro awaits me ;)
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