I found a project on indiegogo (and backed it - but i'm still waiting for it) that should be capable of supply my whole "portable" setup: Az-GTi + ASI 183M for the whole night. 
At present time campaign is closed on indiegogo, but i think it will open again under a different site...
www.indiegogo.com/projects/storm-2-ultim...-nomads/x/10141776#/

I found a similar DIY project on youtube: www.youtube.com/watch?v=0jRsltIW8qM

 

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