Another way of looking at what Mike is saying (yell if I'm getting this wrong):
There's minimal cost difference to upgrade the motor so that you CAN have plenty of power. A larger motor can be run with a very modest battery bank - just not for very long. Put in the larger motor, start with a modest (much less expensive) battery bank that will just get you in and out of the marina. But the infrastructure is then set up to allow upgrading the batteries to handle much more demanding usage needs.
John
From: "mike@electricyachtssocal.com [electricboats]" <electricboats@yahoogroups.com>
To: electricboats@yahoogroups.com
Sent: Thursday, June 2, 2016 10:52 AM
Subject: [Electric Boats] Re: Palmer seized. Converting.
Bruce,
Thought I would share our experiences with boats like your Chance 30/30. It is a respected older 1/2 ton racer and has a good following and value in the market. If you "under power" the boat, it would indeed meet your specific needs but any future owner would be likely less impressed with its performance or value. I know that none of us expect to find ourselves off a lee shore with a rising sea and wind, but it does happen and if you cannot power off to keep the boat and passengers safe, that is not acting as a responsible mariner.
The cost difference between a 5kW and a 10kW motor is very little, less than 20%. I would not recommend a motor less than 10kW. I would also recommend a new propeller for the boat as the gas propeller is not really compatible for the torque and rpm of either a diesel or electric drive.
This is your boat:
Thought I would share our experiences with boats like your Chance 30/30. It is a respected older 1/2 ton racer and has a good following and value in the market. If you "under power" the boat, it would indeed meet your specific needs but any future owner would be likely less impressed with its performance or value. I know that none of us expect to find ourselves off a lee shore with a rising sea and wind, but it does happen and if you cannot power off to keep the boat and passengers safe, that is not acting as a responsible mariner.
The cost difference between a 5kW and a 10kW motor is very little, less than 20%. I would not recommend a motor less than 10kW. I would also recommend a new propeller for the boat as the gas propeller is not really compatible for the torque and rpm of either a diesel or electric drive.
This is your boat:
Hull Type: Fin with rudder on skeg
Rig Type: Masthead Sloop
LOA: 30.58' / 9.32m
LWL: 25.00' / 7.62m
Beam: 10.00' / 3.05m
Displacement: 11200 lbs./ 5080 kgs.
Ballast: 6500 lbs. / 2948 kgs.
Kts Amps Watts
2.0 6 288
2.5 10 480
3.1 20 960
3.9 40 1920
4.5 60 2880
4.9 80 3840
5.3 100 4800
5.9 140 6720
6.7 190 9120 A 10kW would drive the boat to hull speed with some reserve
Hull speed 6.70
Mike
Electric Yachts of Southern California
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Posted by: oak <oak_box@yahoo.com>
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