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Old 18-03-2022, 13:25   #451
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Re: Replace Diesel with electric engine

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I did get a quote to replace my diesel auxiliary with a hybrid setup. Turned out to be 5 times the cost of the diesel replacement and would have given me a fraction of the continuous power b/c the gen set was much smaller than the auxiliary it would replace..... IMHO there is no economically sensible way to make the electric-diesel hybrid work if you want/need continuous power and range.
That’s a series hybrid. I have yet to see a series setup that makes sense.

Beta has partnered with somebody to do parallel hybrids. Much better arrangement and more efficient.
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Old 18-03-2022, 13:59   #452
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Re: Replace Diesel with electric engine

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That’s a series hybrid. I have yet to see a series setup that makes sense.

Beta has partnered with somebody to do parallel hybrids. Much better arrangement and more efficient.
But still much more expensive. .
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Old 18-03-2022, 14:05   #453
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Re: Replace Diesel with electric engine

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But still much more expensive. .
Depends.

If you install same sized prime mover then figure an extra 50% in cost but nothing near 5x direct replacement.

If you install an undersized prime mover that can be augmented with electric drive for the same net HP as the original engine then you are probably close the the same price as direct replacement but with a modest annual fuel savings that eventually would eventually bring the costs to parity.
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Old 18-03-2022, 14:45   #454
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Re: Replace Diesel with electric engine

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Originally Posted by Adelie View Post
Depends.

If you install same sized prime mover then figure an extra 50% in cost but nothing near 5x direct replacement.

If you install an undersized prime mover that can be augmented with electric drive for the same net HP as the original engine then you are probably close the the same price as direct replacement but with a modest annual fuel savings that eventually would eventually bring the costs to parity.
With my fuel usage no but others may have different usage savings
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Old 18-03-2022, 20:51   #455
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Re: Replace Diesel with electric engine

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That’s a series hybrid. I have yet to see a series setup that makes sense.

Beta has partnered with somebody to do parallel hybrids. Much better arrangement and more efficient.
I think this is the future for sail, and motor vessels such as my '14 Greenline 33 Hybrid, with a 165HP diesel and a 7/5 kW clutched inline motor/generator, which basically eliminates the need for a separate genset as long as you have a substantial battery storage capacity and some solar. In my case, an 11.5 kWh 48V 80kg lithium bank, and 500W solar on the coachroof. The "full-house" solar option is 1500W, which is simply not needed in always cold CA waters.

Under electric, and with a 33' waterline and 6 tons loaded, we get about 5kn max for 2 hrs, and maybe 3.5-4kn for 4hrs. Great for cruising around the harbors, but not so much out on the wide-open windy Bay.

But the real deal is pretty much energy independence at anchor with a summer sun - a 120V electric galley with large stand-up fridge/freezer, and a 12/48/120V Victron 5000W inverter/charger that will handle the microwave, ceramic cooktop, and boiler kettle all on - about 4500W - which the 30A dockside cannot!

Full gen. output of 5kW comes at 2000RPM, and a couple of hrs fills the depleted battery, but I've never seen it much below about 48V (max 54.4V - 13.6V 12V equivalent).
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Old 22-03-2022, 12:12   #456
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Re: Replace Diesel with electric engine

A 48volt 100ah bank would push my boat at 2.7 knts at 20 amps for 5 hrs. In daylight solar on a good day would do that. Increase the bank with 2 more and you can run 15 hrs off batteries alone at that speed. Smaller boat would go longer. etc.
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Old 22-03-2022, 12:15   #457
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Re: Replace Diesel with electric engine

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A 48volt 100ah bank would push my boat at 2.7 knts at 20 amps for 5 hrs. In daylight solar on a good day would do that. Increase the bank with 2 more and you can run 15 hrs off batteries alone at that speed. Smaller boat would go longer. etc.
Would love to see the specifics of the build and the draw that would accomplish that .
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Old 22-03-2022, 12:16   #458
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Re: Replace Diesel with electric engine

not counting wind gen
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Old 22-03-2022, 12:20   #459
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Re: Replace Diesel with electric engine

thats taken from similar boats to mine on youtube electric boats and solar designs. Mine is in the build process. No real time direct data yet.
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Old 22-03-2022, 12:22   #460
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Re: Replace Diesel with electric engine

The battery disharge is from a SOK 48volt 100ah server rack bank 1700.00 dollars about now. 20 amps for 5 hrs.
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Old 22-03-2022, 12:26   #461
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Re: Replace Diesel with electric engine

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The battery disharge is from a SOK 48volt 100ah server rack bank 1700.00 dollars about now. 20 amps for 5 hrs.
Good reputable battery now what motor are you looking to install what output and power usage .

Sailing wisdom says otherwise .

Will take a lot more juice to do it . A Formosa is not a light fin keeler .
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Old 22-03-2022, 12:32   #462
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Re: Replace Diesel with electric engine

My electric motor is 48-120 volt 22Kw continuous 55Kw peak water cooled motor. Running at about 12Kw. Remember they have super torque.
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Old 22-03-2022, 12:39   #463
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Re: Replace Diesel with electric engine

Sailing Wisdom I believe is using two motors in series if I remember correctly. There are many variables to consider. Should have an electric boat section in forum. The motor section in there now is filled with diesel problems.
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Old 22-03-2022, 12:54   #464
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Re: Replace Diesel with electric engine

And I predict a direct drive will use about 30 percent less power.
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Old 22-03-2022, 13:04   #465
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Re: Replace Diesel with electric engine

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My electric motor is 48-120 volt 22Kw continuous 55Kw peak water cooled motor. Running at about 12Kw. Remember they have super torque.
Ok so how well does your boat move now with the diesel at about 1/4 throttle? Ie just above idle
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