Electric repower Hunter 450 Passage

[g550]

Thank you!

[sony2000]

I had my shipwright install a 7kw system in my 6500 lbs sloop. My opinion is, knowing
your situation, it would be easier and possibly smarter to fly in a new or used replacement. Then it is only a matter of dropping it in.
Water damage! Is the motor seized?

[g550]

Yes, seized.

[dperchlik]

I took my Electric powered Formosa 47 out on Lake Union on a calm day and took some measurements on boat speed vs kWatts. At 10kW the batteries are putting out ~200Amps. I have QuietTorque™ 20.0 and a 10kW diesel generator. 22" diameter Maxprop.
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[dperchlik]

Here is graph on the data.
https://1drv.ms/i/s!AMgo-6D1I2G44EI

[skipmac]

Originally Posted by dperchlik

Here is graph on the data.
https://1drv.ms/i/s!AMgo-6D1I2G44EI

If I read the graph correctly your top speed is 5.5 kts? Is that just the top speed you tested or can you get closer to hull speed if you crank it up a little more?

Have you done any tests in less than calm conditions? I think it would be very interesting to see how the speed and/or power consumption changes when motoring into waves or a headwind.

[dperchlik]

I only tested to just under 10kW. When I go over 10kW the voltage at the sensor for the generator starts to fall as more and more current comes from the batteries. When the voltage drops to < 48V at the Vsensor the alternators shut off and then the voltage at the electric motor drops really quick with more than 200amps through the wires and connectors. Until I can get rid of some of the voltage drop from connection from the batteries to the motor, I am limited to 10kW steady state even though the electric motor is capable of 20kW. I can do short bursts at 20kW but not long enough to get a stable boat speed.


I only have data from calm conditions. Any time the wind is blowing I am sailing! I will eventually get the some data, at least I should be able to get some motor sailing data.

[skipmac]

Originally Posted by dperchlik

I only tested to just under 10kW. When I go over 10kW the voltage at the sensor for the generator starts to fall as more and more current comes from the batteries. When the voltage drops to < 48V at the Vsensor the alternators shut off and then the voltage at the electric motor drops really quick with more than 200amps through the wires and connectors. Until I can get rid of some of the voltage drop from connection from the batteries to the motor, I am limited to 10kW steady state even though the electric motor is capable of 20kW. I can do short bursts at 20kW but not long enough to get a stable boat speed.

I understand. It does take some pretty hefty wiring and connections to move 200 amps or more. From some of the numbers you posted I'm guessing you're running at +/- 50V? I believe the high power electric drives go with high voltage systems to deal with this problem.

Originally Posted by dperchlik

I only have data from calm conditions. Any time the wind is blowing I am sailing! I will eventually get the some data, at least I should be able to get some motor sailing data.

Sail when the wind blows? What a concept. More sailors should give that a try.

I occasionally try to do the same but unfortunately where I have done most of my boating everything is upwind. Going from FL to the USVI and the Lesser Antilles is just a long, long beat so I usually motor or motorsail to get there faster. Hence my question about the effect of power draw motoring against it.

[dperchlik]

Batteries are 350AHr lead acid 8 x 6V L16 size in series. With generator running the voltage is over 50V as long as I stay under 10kW.
https://www.fisheriessupply.com/dyno...attery-6-volts
I paid about $2200 for the 8 batteries.

[JeffH]

Growley Monster, you’re my kind of people.

[Cadence]

Originally Posted by dperchlik

Batteries are 350AHr lead acid 8 x 6V L16 size in series. With generator running the voltage is over 50V as long as I stay under 10kW.
https://www.fisheriessupply.com/dyno...attery-6-volts
I paid about $2200 for the 8 batteries.

With the generator running. It sounds like diesel electric? The batteries sound like good ballast. I'm sure someplace down the road it will be practical. As long as it makes you happy.

[g550]

Originally Posted by Cadence

The batteries sound like good ballast.

The batteries are sharing the load with genset.

[Cadence]

Originally Posted by g550

The batteries are sharing the load with genset.

I meant weight wise as far as ballast It was not a quip about the system.

[Chris-Le-Bear]

Growley, am heartened by your post and that of a couple of others here as I have spent the last 2+ hours reading a lot of very negative stuff as to why electric engines make no sense and why diesel is ever so much better. I am hunting for a boat to buy, am leaning towards the Aquarius Pilot Cutter which is 24 feet long and weighs close to 9,000 pound. Having lived off the electric grid for some years (with solar and a gen backup for cloudy days) I am keen on the concept of having an electric motor, especially as I have zero mechanical skill. Thank you for making it sound like my dream is a possiblity.

[hamburking]

Originally Posted by Chris-Le-Bear

Growley, am heartened by your post...I am keen on the concept of having an electric motor, especially as I have zero mechanical skill. Thank you for making it sound like my dream is a possiblity.

I agree. Especially for those of us who aren't diesel mechanics and don't aspire to become one. An electric motor needs almost no maintenance, won't freeze, needs no filters...just so simple and powerful!

A couple refit an old Pearson 36 with electric and are sailing the caribbean. The lack of a diesel does not seem to be an issue at all...except maybe they don't spend any money on diesel fuel!!! They made a wonderful vlog series which I recommend...with full specs on the electric conversion:

https://youtu.be/_L1xmG5Kndw

http://www.sailinguma.com/the-motor/

https://youtu.be/lAye0mf2A8g

I hope to one day have an electric sailboat too!