Electric drive conversion

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Bill
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Blev medlem: fre 12 jan 2018 13:40

Electric drive conversion

Inlägg av Bill » ons 02 maj 2018 18:21

Hi everyone,
I want to let you all know that I managed to convert a diesel drive marieholm to electric drive and the results are amazing!
The yacht is not mine; it belongs to a good friend. End of last year I joked about converting his yacht to electric as he drives a Tesla and is very much into renewables! He thought it would be a great idea... and here we are with an electric Marieholm launched two days ago!
The system we went for is a 5Kw Oceanvolt with 8 valence LiFPO4 batteries. I did the conversion myself an I am an engineer and I have lots of information if any of you are interested so if you have any questions feel free to ask!
Here are a few pictures:
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Användarvisningsbild
Johan SWE-1870
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Re: Electric drive conversion

Inlägg av Johan SWE-1870 » ons 02 maj 2018 22:11

That's an interesting solution with a modern motor type! I think many of the members here like to know more about that.

Whats the battery specification? Number of batteries, energy capacity, weight.
How many amps does it need for charging?
Whats the boat speed? Wich distance can it make?
Johan Winberg, SWE 1870 InFinit

Bill
Inlägg: 3
Blev medlem: fre 12 jan 2018 13:40

Re: Electric drive conversion

Inlägg av Bill » tor 03 maj 2018 07:53

Hi Johan,

The batteries are 8 off valence LiFPO4 12V 130 Ah arranged in two parallel strings of 4 batteries in series. The useful energy of this arrangement is about 10KWh. The weight of the batteries is about 20Kg each. I don’t have measured consumption figures yet but here is what I achieved on Monday: going from the launch slip to the marina we were cruising at about 4 Kn using about 300W. The onboard control system was projecting a motoring range of around 40 hrs ( its the best measure as the actual distance covered would depend on tides, currents wind direction and so on). So depending on condition this can give a range of 35-50 Miles at that cruising speed. As we are using a high pitch propeller, this drops the consumption down and makes for a much more responsive vessel, even going astern! As for charging, the charger is using standard shore power (less than 12A). If the projected range is correct, I think we would only need to charge 2-3 times during the season as motor use is only to get sailing from the mooring and return when sails are down! And it’s so quiet!!

Crazy Mary IF2670
Inlägg: 5
Blev medlem: mån 14 maj 2018 18:28

Re: Electric drive conversion

Inlägg av Crazy Mary IF2670 » tor 24 maj 2018 09:00

Hi,

Congratulations, it sounds like a dream! I have been checking the pod motors to laminate on the rudder of my IF, I have seen that some of them can generate electricity while sailing (propellor turns the motor other way around to generate electricity), do you have such function? I also find out that with empty batteries and proper solar panels you can still move even slow...

If you have such a huge range you can reduce the number of batteries (I believe they are like another man on board).
Thks,

Bill
Inlägg: 3
Blev medlem: fre 12 jan 2018 13:40

Electric drive conversion

Inlägg av Bill » tor 24 maj 2018 09:49

Crazy Mary IF2670 skrev:Hi,

Congratulations, it sounds like a dream! I have been checking the pod motors to laminate on the rudder of my IF, I have seen that some of them can generate electricity while sailing (propellor turns the motor other way around to generate electricity), do you have such function? I also find out that with empty batteries and proper solar panels you can still move even slow...

If you have such a huge range you can reduce the number of batteries (I believe they are like another man on board).
Thks,
Hi

It’s interesting that you are considering the rudder electric propulsion as I am putting a system together for my next project! I think this a much better solution than the outboard hanging over the stern and is easily fitted to any IF with out a factory fitted engine.
Regeneration is possible but very much depends on the hull speed.. need to be consistently sailing at over 5 Kn to have any meaningful charging capability. PV panels are better but bulky and inconsistent. Wind gen is better. This is one of the reasons I went for the extra batteries. It doubles the range, halfs the charging cycles, reduces range anxiety(!) and although it doubles the battery weight I think it’s good weight as it’s low and along the centreline of the yacht.

Which motor are you considering?

Crazy Mary IF2670
Inlägg: 5
Blev medlem: mån 14 maj 2018 18:28

Re: Electric drive conversion

Inlägg av Crazy Mary IF2670 » fre 25 maj 2018 16:29

Hi,

It is good to hear that. First I have checked the minnkota and torquedoo, especially torquedoo get a lot of awards and they worked with Hanse 315 for the electric one, I found them a bit expensive and they really do not have a commercialized solution for the rudder, I think they did the rudder-drive only for Hanse, there is nothing in their website. One idea it to get a transom model and part it out and convert it which I would enjoy to do so.


In one of the exhibitions I have found a German company that was providing solutions but at that time I didn't have the Marieholm and I am still trying to find their contact. There are couple of the also belmarine, e-tech, oceanvolt etc...

well folkboat company have the patent of it;

http://www.folkboat.de/#

I did not check if they can only sell the pod and electronics... their supplier is http://www.kraeutler.at/en/motors/boat-motors/ but they do not have rudder drive on website....

http://www.ghboats.com/options/accessor ... ric-motor/
they have it but does not look like a professional company... but what I see on photos is rather simple solution....

What are you planning to do?
Which motor will you use?

Besides that submersible fixed pods are an option but they will slow us down in sailing and we need to drill the hull of a 40 years old boat..... so far folkboat.de made the best one with folding propellor... I am worried their price might cost as much as an IF...
Thx

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