This is my dream but wondering how to make this become true. Which battery which inverter? Is this feasible?

greatly appreciated for any suggestions

Thank you

I use a goal zero yeti with a solar panel. Works great. Can even daisy chain an additional battery.

I can't advise you on what battery and inverter to use, but I can give you advice on power consumption. The worst-case power demand for a K12, with signal levels just hitting the point of limiting, will be around 250 watts. For busking, though, it's likely to be much, much less than that—probably about 125 watts at most, but usually less.

Thanks so much 18hands. Goal Zero Yeti is a great find. However I don't think it can feed K12 more than 45 minutes. But as you said chaning an additional battery is a big plus as well.

Bob thank you for the response. I'll check something from local market due to your advice.