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#/