The second craft, Sunboat II, built on the experience gained with Sunboat, provided full accommodation for six people.
Many designs were created and explored before the final design was chosen. The main hull
is 11.28 m long, 2.35 m wide and 2.4 m high. Smaller hulls, 9.3 m long, are hinged each side of the main hull to give an overall width of 5.49 m. Folded down and locked into place, these provide stability, while allowing the craft
to be transported by road when folded up.
The same solar panels were re-configured into groups of four and additional panels added to give a total of 1,728 cells in 12 groups. Six groups are hinged from each side of the
roof of the main hull and are wired to charge and run a 36 V system. Twelve deep-cycle 6 V batteries, connected in series of six then parallel, are stored beneath the floor. Four smaller solar panels are mounted along the roof to
charge two 12 V batteries supplying electricity for the internal lighting, refrigerator, two-way radio and satellite phone.
A 36 V DC series-wound motor, mounted in a tilting bucket above the foot of an outboard, provides
propulsion. A variable speed controller varies the current used and hence power produced by the motor.
Sunboat II left Yarrawonga on 1 December 1995. The river level was low, exposing many snags, but the boat's shallow
draught (35 cm) enabled it to proceed with caution. In good conditions the boat reached a speed of 13 km/hr. Daily distance covered was between 60 and 85 km.
On straight sections of river in early morning or late afternoon
the panels on one side could be dropped to a 45 degree angle to continue charging the batteries while maintaining travelling speed.
Sunboat II covered a total of 2,500 km in 39 days to claim a new record.