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Electric Outboards and trolling motors on a 10' RIB

 

Below is the data that I've recently collected, comparing several different "electric outboard" and trolling motor options.

The boat for all tests was a West Marine 10' RIB 310, single fiberglass bottom.
Speeds were monitored using Navionics, and averaged for both up and down wind, in a relatively protected marina environment.? Battery data was collected using a Victron 150A SmartShunt.



MOTOR SUMMARY:

Motor ???????????? Voltage ???????????? Max Speed ???????????? Max Power
 Torqeedo 2T ???? 24V ???????????????? 4.8Kn???????????????????? 1200W** ? (Motor testing limited at 1200W due to battery limits)

About $4000, rated at 2400W

Hangkai ???????? ???? 48V ????????? ? ?? 3.8Kn ???????????????????? 1000W About $330, Rated 1000W - VERY Noisy

Minn-Kota 35# ????12V ????????? ? ?? 2.3Kn ???????????????????? 410W

Newport 55# ???????? 12V ???????????? 3Kn ???????????????????????? 550W About $200, Rated 50A@12V


Summary thoughts:

For speed and power, the Torqueedo 2T was clearly on top.? Unfortunately, the 24V Torqeedo is about $4000+. ? Finding 24V batteries that fit in a standard battery box is a bit of a challenge, but do-able.? Currently, they are running about $300 for a 60Ah battery. ? Torqeedo offers other smaller motors with integrated batteries - but they are still have? about a $2000-3000 price tag, and spare batteries are VERY expensive.

The Hangkai is a VERY cost effective answer for a 48V outboard electrict motor.? However, this motor has a VERY touchy throttle, is extremely noisy, and didn't perform significantly better than the 55# Newport trolling motor.

While the Newport 55# won't get you anywhere fast - it does seem to do a decent job, and should be sufficient for getting the dinghy from boat to shore (as long as there isn't a strong/fast current).? 12V lithium batteries are easy to obtain, and a very common voltage to work with.? Overall bang for the buck in terms of a nicely performing, low cost motor with an easy to purchase / replace battery seems to be the Newport.? Just don't be in a hurry.
Note that while the Torqeedo 2T was the fastest option - running at 1200W will kill a 60Ah 24V battery in about an hour.? I would want to have at least two batteries minimum.??
The Newport 55# trolling motor should run in excess of 2 hours on a single 150Ah 12V battery.? A second, smaller, lighter, less expensive 100Ah battery can be brought along as backup for plenty of range.
 

I used a similar trolling motor on a 17" Seaward Fox with a 12V deep cycle battery for Wednesday beer can races.? We would leave the dock and raise the sails and the reverse when finished.? Maybe 15 minutes of use.? Recharged with a flexible solar panel all week. When the wind speed was higher we used a second trolling motor and battery.? The lake didn't have any current.? The most difficult part was lifting the battery out of the cabin and placing it in the stern by the motor.? I don't have any data about speed, but reliability and maintenance were awesome.

Thanks for the data.? I'm looking to do something similar with a WM RB350, but have concerns with wind and current otrside of? a protected lake.

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