Mike,
Not my strongest point but there has been a
thread on powering an EQ6 which suggests that it draws about 2 amps normally with a spike to 3 amps when changing direction.
It looks like you are getting into the world of deep cycle marine batteries (have no idea of the costs but on the Central Coast there has to be lots of places selling them). As for size you need to calculate the number of hours you want between charges by 2 to get the amp/hours then add about half again for a buffer and you are away.
Sooooooooooo say you image for three nights for 10 hours then you would need 30x2=60 amp hour battery plus a bit extra. BUT, as there are recharging facilities out there a 40 amp hour battery would be more that ennough if you don't forget your charger.
Hopefully someone else who has actually used this gear can verify, or shoot down in flames, this "advice" given by someone who has school boy electronics from 35 years ago and who has never used this type of gear
