a 100A-h will last me all night with the lappy running off a DC-AC converter for the laptop (prolly could use a DC as the eepc runs 12 volt. anyhow
) and the mount, everything else i run off batteries or the laptop power anyhow. after a full night eg from 5-6 in th eevening till 5-6 in the morning i will only just use 1/3rd or so of the battery. so a 100 ah should last a normal person with all the fruit for 2 full days without hassle.