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Forum: Electric Propulsion (EP)

24-06-2019, 15:51

Replies: 428

Viability of electric only propulsion in 2018 - is there a good option after all?

Views: 53,343

Posted By KTP

Re: Viability of electric only propulsion in 2018 - is there a good option after all?

Battery bank is way too small for that size yacht. Something around 80kWh would be more reasonable.

Forum: Electric Propulsion (EP)

13-01-2019, 21:05

Replies: 428

Viability of electric only propulsion in 2018 - is there a good option after all?

Views: 53,343

Posted By KTP

Re: Viability of electric only propulsion in 2018 - is there a good option after all?

I kind of think youtubers like the above will not really help the general confidence in electric propulsion. They don't seem to know much of anything about their electric system. Designing and...

Forum: Electric Propulsion (EP)

13-01-2019, 09:07

Replies: 428

Viability of electric only propulsion in 2018 - is there a good option after all?

Views: 53,343

Posted By KTP

Re: Viability of electric only propulsion in 2018 - is there a good option after all?

I do not really see the difference between cruising with electric and cruising with no engine at all, and I know there are experienced monohull cruisers who do without an engine. As long as you...

Forum: Electric Propulsion (EP)

13-01-2019, 09:00

Replies: 428

Viability of electric only propulsion in 2018 - is there a good option after all?

Views: 53,343

Posted By KTP

Re: Viability of electric only propulsion in 2018 - is there a good option after all?

I thought we were discussing days with no wind and flat water. I agree that with swells and such on the open ocean that even with no wind you might find it hard to get 2 knots with only 500 watts...

Forum: Electric Propulsion (EP)

12-01-2019, 22:11

Replies: 428

Viability of electric only propulsion in 2018 - is there a good option after all?

Views: 53,343

Posted By KTP

Re: Viability of electric only propulsion in 2018 - is there a good option after all?

No you are right about that. 500 watts of panels would probably be lucky to produce 3kW-h per day.

We are aiming to have a lot more than that, something around 1200 watts. We would be lucky...

Forum: Electric Propulsion (EP)

12-01-2019, 21:55

Replies: 428

Viability of electric only propulsion in 2018 - is there a good option after all?

Views: 53,343

Posted By KTP

Re: Viability of electric only propulsion in 2018 - is there a good option after all?

Here is a chart of power needed to push a 36 foot Pearson from Sailing Uma. I think it was something like 250 watts were needed to push it at 2.3 knots.

You can see that as you approach something...

Forum: Electric Propulsion (EP)

12-01-2019, 21:44

Replies: 428

Viability of electric only propulsion in 2018 - is there a good option after all?

Views: 53,343

Posted By KTP

Re: Viability of electric only propulsion in 2018 - is there a good option after all?

No, there are people who scull for hours and claim to maintain 0.5 to 1 knot, which means unless they are super buff, they are not putting out 300 to 400 watts. 100 or *maybe* 150 watts.

A 3.5hp...

Forum: Electric Propulsion (EP)

12-01-2019, 17:47

Replies: 428

Viability of electric only propulsion in 2018 - is there a good option after all?

Views: 53,343

Posted By KTP

Re: Viability of electric only propulsion in 2018 - is there a good option after all?

In becalmed flat water 500 watts would easily push a boat at 2 to 3 knots.

Probably 100 to 200 watts would push it at 2 knots.

Think about a sculling oar. People are able to get .5 to 1 knot...

Forum: Electric Propulsion (EP)

12-01-2019, 15:32

Replies: 428

Viability of electric only propulsion in 2018 - is there a good option after all?

Views: 53,343

Posted By KTP

Re: Viability of electric only propulsion in 2018 - is there a good option after all?

Yes, it is the silence and lack of smell of oil and fuel which attracts me to EP.

If I wanted to motor all of the time I probably would not have gone for a sailboat. I HATE the sound of a diesel...

Forum: Electric Propulsion (EP)

12-12-2018, 06:43

Replies: 428

Viability of electric only propulsion in 2018 - is there a good option after all?

Views: 53,343

Posted By KTP

Re: Viability of electric only propulsion in 2018 - is there a good option after all?

Capt, what size is your battery bank for that relatively large boat?

Eventually I would like to have about 20kWh, which would certainly get me in and out of most harbors and marinas plus be a...

Forum: Electric Propulsion (EP)

29-11-2018, 08:15

Replies: 428

Viability of electric only propulsion in 2018 - is there a good option after all?

Views: 53,343

Posted By KTP

Re: Viability of electric only propulsion in 2018 - is there a good option after all?

I think we will be doing some testing of that this spring (we are currently getting the finishing touches on the electric motor install and then will work on replacing some rigging). Our hope is...

Forum: Electric Propulsion (EP)

28-11-2018, 18:20

Replies: 428

Viability of electric only propulsion in 2018 - is there a good option after all?

Views: 53,343

Posted By KTP

Re: Viability of electric only propulsion in 2018 - is there a good option after all?

Yeah that is probably about right. 7 to 10kW would get you going around 4 to 6 knots in a 40 foot boat depending on wind and seas. So about a 8 to 15 mile range at that level. If you were to drop...

Forum: Electric Propulsion (EP)

28-11-2018, 08:54

Replies: 428

Viability of electric only propulsion in 2018 - is there a good option after all?

Views: 53,343

Posted By KTP

Re: Viability of electric only propulsion in 2018 - is there a good option after all?

I think the new Trojan Trilliums that are coming out in early 2019 are about 12.8V nominal at 93ah for around $650 each (with all sorts of safety and monitoring stuff). They are rated for something...

Forum: Electric Propulsion (EP)

20-11-2018, 14:25

Replies: 428

Viability of electric only propulsion in 2018 - is there a good option after all?

Views: 53,343

Posted By KTP

Re: Viability of electric only propulsion in 2018 - is there a good option after all?

A 20kWh bank (which is pretty small by electric vehicle standards) could hold the equivalent of 8 liters of diesel. Not much really but I guess it adds up over time. If you did 2000...

Forum: Electric Propulsion (EP)

18-11-2018, 08:46

Replies: 428

Viability of electric only propulsion in 2018 - is there a good option after all?

Views: 53,343

Posted By KTP

Re: Viability of electric only propulsion in 2018 - is there a good option after all?

We are getting close to our first sea trial with our PS34 conversion to electric. We removed the engine, transmission, fuel tank, exhaust riser, hoses, sea water strainer, fuel filters. Oh it was...

Forum: Electric Propulsion (EP)

14-07-2018, 18:47

Replies: 428

Viability of electric only propulsion in 2018 - is there a good option after all?

Views: 53,343

Posted By KTP

Re: Viability of electric only propulsion in 2018 - is there a good option after all?

Does anyone make a small air cooled diesel generator maybe slightly bigger than the Honda EU2000i?

We plan to pull the 30 gallon diesel fuel tank from our Pacific Seacraft 34 since we have pulled...

Forum: Electric Propulsion (EP)

12-07-2018, 06:13

Replies: 428

Viability of electric only propulsion in 2018 - is there a good option after all?

Views: 53,343

Posted By KTP

Re: Viability of electric only propulsion in 2018 - is there a good option after all?

No, you said turn off regen and you would be doing 7 knots instead of 5 knots. Our hull speed is 6.87 knots so if we were doing 7 knots it would be pretty good wind and really starting to push a...

Forum: Electric Propulsion (EP)

11-07-2018, 19:11

Replies: 428

Viability of electric only propulsion in 2018 - is there a good option after all?

Views: 53,343

Posted By KTP

Re: Viability of electric only propulsion in 2018 - is there a good option after all?

Mmm, not so sure. I have had times where I am sure we were up against hull speed and had plenty (too much) wind. When the boat is pushing 10kW of water on the bow because it is exceeding designed...

Forum: Electric Propulsion (EP)

11-07-2018, 17:24

Replies: 428

Viability of electric only propulsion in 2018 - is there a good option after all?

Views: 53,343

Posted By KTP

Re: Viability of electric only propulsion in 2018 - is there a good option after all?

I wonder if sizing the prop quite differently for best efficiency regen you would be able to get quite a bit more, while still remaining efficient for sailing and motoring. It would seem that for...

Forum: Electric Propulsion (EP)

11-07-2018, 13:03

Replies: 428

Viability of electric only propulsion in 2018 - is there a good option after all?

Views: 53,343

Posted By KTP

Re: Viability of electric only propulsion in 2018 - is there a good option after all?

It is also really hard to get contaminated solar energy.

Forum: Electric Propulsion (EP)

11-07-2018, 10:10

Replies: 428

Viability of electric only propulsion in 2018 - is there a good option after all?

Views: 53,343

Posted By KTP

Re: Viability of electric only propulsion in 2018 - is there a good option after all?

I have a Torqeedo 1003 which can put out around 1000 watts to the prop IIRC. We have used it on our little Montgomery M17 to push us at about 4.8 knots full throttle but it would push us at 2 knots...

Forum: Electric Propulsion (EP)

11-07-2018, 09:50

Replies: 428

Viability of electric only propulsion in 2018 - is there a good option after all?

Views: 53,343

Posted By KTP

Re: Viability of electric only propulsion in 2018 - is there a good option after all?

Well I will report real world what 2kW does for a 15,000 pound PS34 since we are moving forward with EP. Based on what I saw for diesel consumption when bringing this boat from Seattle to Blaine, WA...

Forum: Electric Propulsion (EP)

11-07-2018, 09:19

Replies: 428

Viability of electric only propulsion in 2018 - is there a good option after all?

Views: 53,343

Posted By KTP

Re: Viability of electric only propulsion in 2018 - is there a good option after all?

I was trying to counter an argument that said EP isn't viable for cruising when people are currently cruising using just an oar (well I only know about Lin and Larry so very small sample size). I...

Forum: Electric Propulsion (EP)

11-07-2018, 08:27

Replies: 428

Viability of electric only propulsion in 2018 - is there a good option after all?

Views: 53,343

Posted By KTP

Re: Viability of electric only propulsion in 2018 - is there a good option after all?

Even if a prop was only 25% efficient vs 100% efficient sculling, this means it would only take 400 watts EP to equal a person sculling with a oar.

That is the output of two or three solar panels...

Forum: Electric Propulsion (EP)

11-07-2018, 07:50

Replies: 428

Viability of electric only propulsion in 2018 - is there a good option after all?

Views: 53,343

Posted By KTP

Re: Viability of electric only propulsion in 2018 - is there a good option after all?

Lin and Larry would want to talk to you.

The average human can output 100 watts continuously. Sculling a sailboat for 6 hours would consume about 600 watt-hr. That is a pretty small power...

Showing results 1 to 25 of 37

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