--- In electricboats@yahoogroups.com, "inganear1" <inganear1@...> wrote:
>
> If I recall sometime ago someone in the group made a busbar type of arrangement to control voltage as a speed control for their system not using the normal electronic controller, or proposed anyway, can't remember exactly.. I would like to make such a system for a backup since I use 6 volt batteries in my 48 volt system on one of my boats. Can someone point me in that direction..
> Dave K
>
I just launched my Privateer 26 sailboat with a basic electric drive to get me out of the marina. I didn't buy a controller yet, as I wanted to test out the system before committing to 48 or 72 volts. I use a Mars ME0709 motor with a chain drive 2.2 reducer to the original 2 blade 13lh12 Michigan Sailor prop. I have 4-12v deep cycle batteries in series. I tap off a 24v lead to a 200amp marine battery selector switch for No.1, and tap off 48v for the No.2 terminal. I blocked off the "both battery" setting on the switch. The power lead is then run to a reversing contactor (the type used for linear motion control, in-off-out), and then the motor. I have a simple on-off-on selector switch in the cockpit to control the reversing switch.
This system works fine for me. There is no problem with arcing, and I have a 2 speed drive, which gets me out of the marina into the lake. The 24v setting is plenty fast for my in-marina needs. Probably about 3 mph. The 48v setting will do nearly hull speed. The boat is 6500 pounds.
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