Thank you guys!
Yeah I know this honda generator thanks,
another solution may would be a small car battery and an inverter
but I am looking for something more portable, like the MXR dc brick or the VOLTO pedaltrain
but these just look to be quite similar to the pedal juice by sanyo, so I need something more powerfull.
I am searching in the web but I can not find any, only rechearchable batteries for mobile phones and portable dvd players...
thanks a lot for your help guys,
I will keep on searching...