Electric propulsion on dinghy

[zengirl]

Originally Posted by deckofficer

Staying with the standard V19 prop, a Torqeedo 4.0 would work as well as a 9.9 hp high thrust on your Bristol. If you only need it for getting in and out of the marina, it is a good choice for aux propulsion. Battery size would dictate your range.

Oh good, I'm not crazy! That's exactly what I intend to use it for, thanks

[offpist]

Best part is, I paid about $1000 for 43 cells.
So, at 16 cells that's 372 dollar.
Should one or two cells fail, I have plenty spare ones on-board.

8 of them makes the start battery on the boat.

As an "charging station" onboard i use Piktronik KOP602-48V
It charges 48V/9A, from 230V using the battery/inverter, generator or shore power.

KOP602

It can be customized using USB cable and setup the charging program just the way you want to any battery type.

I pulled an 230V cable to one of the lockers up on deck. The power can be turned on/off from an switch on the main panel.

Charging takes about 10 hours if i run the battery flat, but usually 2-3 hours of charging is enough after a days use.

[deckofficer]

Originally Posted by zengirl

Oh good, I'm not crazy! That's exactly what I intend to use it for, thanks

I'm sorry, for some reason I was thinking the Bristol was a lighter day sailor. Does your have the Atomic 4 18 hp inboard?

[deckofficer]

That was a super deal on your cells. I paid $880 for (8) cells.

[offpist]

If you look closely in the background of the picture, you can see lots of Nissan Leaf battery cells.

I will build an 14S battery setup using 7 of these modules.
(each module contains 2 cells).

Then I can run the dingy at just one battery, total 26,6 kg.

(51,8V) 66AH capacity should still be enough for normal use.

I paid 1100 dollar for the complete battery pack with 48 modules.
So that makes about 160 dollar for the complete battery solution, using 7 modules.

LiMn2O4 is not as safe as Lifepo4, so it needs to be used with caution.

[deckofficer]

offpist,

Have you had a chance to document power consumption at different speeds? The reason I ask is the thread we came from was discussing solar panels and the Renogy version of these efficient panels produce 100 watts and only weigh 4.4 lbs. With that in mind, I'm curious what a limp home speed would be at 400 watts consumption? By using math that says to double the speed requires an 8 fold increase in power. If 20 km/h takes 4500 watts, then 10 km/h might only require 563 watts. 9 km/h could be 400 watts, not bad for a limp home speed if batteries are empty.

[offpist]

Its not that easy.

This depends on the dingy I guess.
There is an GPS so i can see both the speed, and consumption in the display.
400W should give about 5 km/h speed on my dingy.

From 6 km/h to 12 km/h can take all the way up to full throttle.
As the dingy is only pushing the water in front of it.

So...its ether slow.. of fast. Nothing in between really.

The catamaran dingy was slightly different as it allowed more to operate at "medium speed" so to say..

[zengirl]

Originally Posted by deckofficer

I'm sorry, for some reason I was thinking the Bristol was a lighter day sailor. Does your have the Atomic 4 18 hp inboard?

Yes, I do have Atomic4, but was looking at Elco electric inboard.

[ranger58sb]

Originally Posted by zeehag

i have torqueedo t 1003s. surpasses little trolling motors by miles.

minnkota showed me how poorly designed TROLLING motors do.

Was that particular Minn Kota model similar in pounds thrust or horsepower to the Torqeedo? Or was it one of their small ones?

-Chris

[deckofficer]

Originally Posted by zengirl

Yes, I do have Atomic4, but was looking at Elco electric inboard.

Good, I was thinking you were considering the Torqeedo. Elco has been in the game for a long time. Their EP-1200 probably would work well for you.

[Djarraluda]

I bought freshwater minn-kota some 14 years ago for my tender. Capsized the dinghy 12 years ago and lost the battery. Hosed the motor down and sprayed some WD40 on the throttle, bought a new golf cart sealed (OK, for the pedantic, it is Valve Regulated) lead acid traction battery and it is still going strong. Note that is the freshwater version used and sunk in salt water.
I do not use it much, but it is so good as a tender and cheap as heck. Scares some folk who have not seen or heard it before.
Roger

[Paul Mazza]

I've got a Motor Guide Great White 52 lb thrust electric OB. I use it on a 10 foot Camelion nesting dinghy (about 110 lbs). I power it with a 32 Ah AGM. I've got a couple of those. It moves the boat at a good clip but won't plane. I bought the OB for a 900 lb. 23 foot Newick Tri. It was the largest 12 volt saltwater electric I could find. It got me in and out of the harbor, but wouldn't push the boat into a breeze so I replaced it with a 2 HP Honda. I sold the tri and am now outfitting a 37 foot mono. We're carrying diesel and propane, so I really wanted to avoid carrying gasoline also. And since the dinghy rows and sails well, I think the electric OB will be a nice addition. It's not in the same league as the Torqueedo, but fairly cheap. If you do decide to go the non-Torqueedo route, be sure to buy an electric OB that's made for saltwater.

[ranger58sb]

At quick glance, I see Minn Kota makes 24v, 32v (112-lbs thrust) , and 48v (2-hp) models. Not inexpensive, though. The latter is more $$ (MRSP) than our new 15-hp 4-stroke was (actual $).


-Chris

[HopCar]

Paul, since you already carry propane, another option to avoid gasoline is a Lehr propane fueled outboard.

[zeehag]

Originally Posted by ranger42c

Was that particular Minn Kota model similar in pounds thrust or horsepower to the Torqeedo? Or was it one of their small ones?

-Chris

it was a trolling motor with separate battery in a freeking dinghy. like i am gonna stop the neighbor and ask what motor ye using--was cheap and unreliable. that is what i know. i would not use a trolling motor with a separate battery and wires all over the dinghy-- is not effective nor efficient. i am happy with mine.
if you wish to propel your dink with a drill, i dont care. you asked what we thought about the motor --i told ye and i also added what i have SEEN as well as what i have EXPERIENCED.
if you do not want the experiences of those who have been and ARE out here using equipment, do not ask about it
i found i am able to actually go farther with the motor after the gps shows there is no charge than i have seen others go with a new battery and minnkota. so i laugh at you and your desk sitting theories.
i am here in pair a dice USING my torqueedo.