Hi, my name is Anton and I joined some time ago, I am overwhelmed with information in this group. English is not my native language and I try to do my best. All my life I spent little to no attention to environmental problems/solutions.
I am now the proud owner of a James Wharram Pahi 42 catamaran http://s1226.photobucket.com/home/harpitap/index
specifications: (mine is actually 43ft)
LOA (length overall): 12.8 m (42 ft)
LWL (length at waterline): 10.36 m (34 ft)
Beam: 6.7 m (22 ft)
Draft minimum: 0.64 m (2 ft 1 in)
Draft maximum (e.g. boards down): 1.07 m (3 ft 6 in)
Windward sail area: 59.6 m² (642 ft²)
Displacement, lightship (empty): 3500 kg (3.44 tons)
Payload: 3000 kg (2.95 tons)
Hullshape: V - V
Installed is a 15hp Honda motor. After cleaning out the hulls I found about 10 empty cans of fuel and a nasty fuel stench in the storage room. All electric wiring had corrosion.
After many days, thoughts, research and discussions I decided to make this a full green boat. Not only declining fossil fuels but also "non fossil fuels", that means no backup system. The boat will sail in Asia, mainly coast sailing and islandhopping so there will be enough sun and/or wind. I would like to keep this post on topic so I will not go in to details about cooking, toilet, air conditioning, hot and cold water, waste and drinking water.
From the mast to the rear end is 5.5x6.5=35.75m2 available for solar panels, more if needed. The panels will be installed on a roof just under the boom. The booms shade on the panels is a problem for witch I have no solution. I have 6 Prevailer pv-27dc on board and I don't know if or how they could be set to use (thoughts?). As for the batterybank I was thinking LifePo4, as I understand are the safest.
According to the building plans that came with the boat I think it is possible (after redesigning the rutter and mount) to install pod-motors build in the rutters and using foldable props, regenerating motors would be awesome. One or two wind-generators is optional.
Requirements: the boat will sail in Asian waters using the motors for distances <30km, and sails for >30km. The desired trolling speed for motoring will be 5kn at 70%. 50 of these 70% must come directly from the panels thus draining the bank for 20%. this would give me theoretically 5hrs at 70% and unlimited 50% or am I making a mistake here?
The budged for the panels, motors, controller, charger, transformer, wind-generators, battery bank is $40.000. This is not fixed but I have to set it somehow ;-)
What setup do you suggest, what are the best pod-motors, battery, panel and what are your thoughts about this project?
Anton
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