I agree with Ed's answer, however I believe that few other electric outboards (i.e. trolling motors) achieve the same overall efficiency as the Torqeedos. A trolling motor will typically use more energy to sustain the same speeds.
For slower speeds and a light boat, the Electric Paddle is a nice solution. I believe that it's overall efficiency rivals the Torqeedos, though the two products are designed for different types of boats and use cases. http://www.electricpaddle.com/index.html
Fair winds,
Eric
Marina del Rey, CA
--- In electricboats@yahoogroups.com, "Ed Bachmann edbz" <edbz@...> wrote:
>
> 5 knots is the hull speed for your Badger. It is unrealistic to expect any motor/battery combo to maintain that speed unless you spend multi-thousands for the battery pack.
>
> Ask if you can live with a 2 knot speed. If you can, then electric can work very well for you. I doubt that you will find any practical way to maintain anything much over 3 knots.
>
> Below is what Torqeedo says you could expect from their setup with its 520wh battery.
>
> The watthour requirements for speed/range will be similar with any small electric motor. You can ballpark figure that to maintain 5 knots on your boat, it will need 1000 watts for a 1 hour run. At one third hull speed, that total amount of battery power will run it for 10 to 20 times as long.
>
> If you go to the files section and run the eboat power spreadsheet, you are going to come up with similar numbers.
>
>
> Travel 1003 with integrated battery (29.6 V / 18 Ah)
> Inflatable, dinghy, sailboat or daysailer up to 1.5 tons
> Speed in knots Range in sm Run time in hours
> Slow speed
> 1.5 - 2.0
> 15.0 - 20.0
> 10:30
>
> Half throttle
> 2.5 - 3.0
> 8.5 - 10.5
> 3:30
>
> Full throttle
> 4.5 - 5.0
> 2.5 - 2.8
> 0:35
>
>
>
>
>
> From: Mike C
> Sent: Wednesday, June 01, 2011 4:48 PM
> To: electricboats@yahoogroups.com
> Subject: [Electric Boats] What to do
>
>
> I have a Wes Farmer Badger http://www.duckworksbbs.com/plans/wf/badger/index.htm with a motorwell and I am trying to decide what to to do for power.I would love to go electric but the outboards are very expensive.Would a large trolling motor work for me? I would like to travel at about 5 knots for as long as possble.I would like to use a rudder and have a controller of some sort about in the middle of the boat.Any ideas and what this would cost me?
>
> Thank You
> Mike
>
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