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Old 02-07-2020, 09:26   #241
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Re: Replace Diesel with electric engine

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Originally Posted by Bill Seal View Post
Maybe I'm color blind or stupid, but it appears that the electric motor magically increases RPM while keeping torque and power constant. ????
Magic Electric HP that defies physics
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Old 02-07-2020, 10:39   #242
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Re: Replace Diesel with electric engine

Quote:
Originally Posted by Bill Seal View Post
Maybe I'm color blind or stupid, but it appears that the electric motor magically increases RPM while keeping torque and power constant. ????
Indeed a problem with these curves ...
The pink curve rise way to quickly
(could not find the original source)

But the basic principle still stands I think.

For instance from :
https://theconversation.com/heres-wh...-torque-115356







Which lead to basically the same analysis.
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Old 02-07-2020, 12:17   #243
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Location: Monterey, CA
Boat: '14 Greenline 33 Hybrid m/v
Posts: 70
Re: Replace Diesel with electric engine

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Originally Posted by MichaelPrichard View Post
I do apologize for appearing to pile onto PineyWoodsPete, especially since I'm fascinated by your new boat and do largely agree with most of your comments, but I did really want to quibble with this line: while there are some truly lousy TVs out there, and computers the world over generally suck, which I blame on software (as a former Apple HW Engineer), the world is full of refrigerators that run over 30 years with.... and this is the key part.... zero maintenance, ever. Most people don't even vacuum the heat exchanger coils on the back every 10 years. And those lousy TVs will mostly operate as well as they did when they were new up until the $0.25 under-spec'd capacitor burns out 5 years later. But the point is, they'll operate that way with zero maintenance. Running a diesel with no oil changes, replacement belts, impellers or filters will kill the engine in a few hundred hours of use. Of course, no one should ever operate something as magnificent as a well engineered diesel thusly, and I maintain my converted 2003 Duramax powered Suburban (22mpg thank you very much) to the best of my ability because I can't afford a Tesla yet... (end rant)

No apology necessary, Michael! Our last cruising sailboat was a '93 FP Antigua 37 with same Yanmars we bought in Seattle in '96, taking it from near top of Vancouver I. to top of Nova Scotia, then Gulf Coast of FL - from where we had to deliver to Annapolis for full asking price of $25,000 over the $150,000 we paid - and with 4000+ hrs on the engines, which still ran as always.

The only mechanic I've ever called for this or any of the 7 diesels or 9 gas outboard engines I've owned over 60 years was for an oil leak around one of the cat's HP fuel pumps on the leg down to San Diego due to defective gasket. Shimming injection timing not in my skill set. When same happened with the 2nd engine, I simply sealed the perimeter with two coats of epoxy.

What sold us 79 year olders on the Greenline was the full-time 120V through the 48V 12kWh lithium pack and 5kW Victron inverter/charger and 480 kW solar, letting us hang on the hook for at least 3 days with amps to spare even with microwave and electric (not induction-type) stove top - and a reefer/fridge to kill for! For charging, the motor is a 5kW gen @ 2000+ engine RPM.

When the Covid crisis passes, we welcome you to drop down to Seaside for a day or two to check out the Greenline - which was Paul Kaplan's of KKMI lightly used boat, beautifully outfitted and maintained.
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