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Tesla Electric Boat Motor

Old 01-31-2021, 05:32 AM
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Originally Posted by ericinmich View Post
There is a little more info on their web site, but basically they used up most of the battery in an hour, and if you convert the KWH of batteries to what that would be in gasoline (factoring gas engines use about 25% of the energy in a gallon of gas), they use about 4 gallons of gas. So 1000lbs of batteries vs. 24lbs of gas.
Battiery development is making them cheaper, GM has said the LG batteries are 40% cheaper than pervious versions, but batteries aren't getting ligher, so I don't see any real application on a planing boat for a long time.
I didn't do the math myself, but assuming you are correct, that 4 gph of gas was the equivalent of utilizing an average of 40 hp from that motor for the hour of use. It would be like running your typical 23' CC at 6 kts for 50 minutes and at 25 kts for 10 minutes, which works out to 10 nm of use from 1,000 lbs of batteries. It might work for some of you, but I don't have too many days on the water that I don't cover less than 10 nm.
Old 01-31-2021, 05:55 AM
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They sure picked an ugly color green!!
Old 01-31-2021, 06:04 AM
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The website said this motor had a range of 40 miles with the 26 tritoon it pushed. I think you would expect more than 10 miles from a 23' CC.
Maybe 25 but still not much. Here is the Hybrid Marine Website if you have not seen it yet.
https://hyperelectricmarine.com/products

There are a few hybrid systems on trawler cats already, just can't find any that they have sold.
Here is a 33' claiming 2500 mile range at 8 knots using 180 gallons of diesel.
​​​​​​https://herleyboats.com/catamaran-powercat-3400/


For a short trip an electric has possibilities. For longer trips a hybrid looks like it can perform.
The cost to play may be higher than conventional but I would not bet that this won't change.

Old 01-31-2021, 06:13 AM
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gasoline has about 100x the energy density of Lithium Ion batteries. It's going to be a while.
Old 01-31-2021, 06:32 AM
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Originally Posted by maintenanceguy View Post
gasoline has about 100x the energy density of Lithium Ion batteries. It's going to be a while.
Exactly. The easiest way to think about is that 1 gallon of gas is equal to 100lbs of battery. So for a 30’cc to have a 50 miles range the battery would be 5000 lbs. This a rough estimate but pretty close to reality. I would say for a boat never going more than 20 miles per day it may have a chance as if the boat got 2mpg with the gas engine then a 1000lb battery is needed. For an offshore boat doing 200 mile round trips you are looking at 20,000lb battery needed.

Obviously once battery tech makes a few major leaps it will become more feasible. I would own one in a second. Imagine no fumes, smoke, outboard/inboard maintenance ect.
Old 01-31-2021, 07:48 AM
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Originally Posted by dspencer View Post
The website said this motor had a range of 40 miles with the 26 tritoon it pushed. I think you would expect more than 10 miles from a 23' CC.
Maybe 25 but still not much.
Here is the Hybrid Marine Website if you have not seen it yet.
https://hyperelectricmarine.com/products
There are a few hybrid systems on trawler cats already, just can't find any that they have sold.
Here is a 33' claiming 2500 mile range at 8 knots using 180 gallons of diesel.
​​​​​​https://herleyboats.com/catamaran-powercat-3400/
If you run the electric motor at the most efficient pure displacement speeds on a hull designed for it, which a tritoon is a very good candidate, you might get 34 nm (40 sm) of range, but on a 23' CC at planning speeds you are looking at about 110 hp just to keep it on plane at 18 kts - at 4 kts, you might see 25 nm on a 23' CC, but that is a 6 hour tour.
Diesel electric hybrids are what every modern cruise ship runs on, and it actually started with German submarines in WWI over 100 years ago, so that isn't exactly new technology.
Old 01-31-2021, 08:26 AM
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Originally Posted by dspencer View Post


The website said this motor had a range of 40 miles with the 26 tritoon it pushed. I think you would expect more than 10 miles from a 23' CC.
Maybe 25 but still not much. Here is the Hybrid Marine Website if you have not seen it yet.
https://hyperelectricmarine.com/products

There are a few hybrid systems on trawler cats already, just can't find any that they have sold.
Here is a 33' claiming 2500 mile range at 8 knots using 180 gallons of diesel.
​​​​​​https://herleyboats.com/catamaran-powercat-3400/


For a short trip an electric has possibilities. For longer trips a hybrid looks like it can perform.
The cost to play may be higher than conventional but I would not bet that this won't change.
That’s not nearly as wild as I was expecting.
Old 01-31-2021, 08:41 AM
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I'm just going to do some quick and dirty math with a few assumptions on the favorable side of electric...

Assume 100% electric utilization (not anywhere even close!)

1050lbs =350hp/1 hr

1hp/hr = 3 lbs

My tugboat is 3000hp

3000hp/hr = 9000 lbs

X 24 hrs/day = 216,000 lbs

X 7 days for an offshore trip from Houston to New York = 1,512,000 lbs, or 756 tons of batteries to do a one week trip on a 180 ton boat.

Not quite viable yet.
Old 01-31-2021, 08:05 PM
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Everyone saying that gasoline has 100 times the energy density of Lithium Batts are correct...how ever you all are missing the 2nd law of thermodynamics which covers efficiency.
Which is only 30-35%, meaning that, gasoline may be more energy dense, but you aren't going to get all that energy from it.
Old 02-01-2021, 04:17 AM
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Originally Posted by midcap View Post
Everyone saying that gasoline has 100 times the energy density of Lithium Batts are correct...how ever you all are missing the 2nd law of thermodynamics which covers efficiency.
Which is only 30-35%, meaning that, gasoline may be more energy dense, but you aren't going to get all that energy from it.
No energy storage or consuming device is anywhere near 100% efficient - if it were 100% efficient perpetual motion would be a real thing.
All of the above calculations, whether is is hp produced by gas or electric and the power consumed by the propulsion device is based upon real world use that takes into account what a particular propulsion system uses and produced (for example, modern four stroke outboards are at about 9.5 gph per 100 hp), so whether a gas engine is 5%, 35%, 50% or more is irrelevant to the discussion. When it comes to electric motors, their efficiency is better while kept within very limited parameters (80% while producing 75% power, but only about 40% at 25% power), as an overall average it is only marginally better than a 4 stroke diesel at 48%.
Then there are the losses in going from a central production facility for the electric power through transmission lines and transformers to a battery charger and then the battery for user consumption, which is at about 60% (the battery itself is only about 85% efficient - for every 100w put into the battery only 85 comes out as power, the rest is lost as heat.
What is lost on most people is that there is no free ride and most all propulsion systems aren't very efficient.
Old 02-01-2021, 04:49 AM
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Originally Posted by midcap View Post
Everyone saying that gasoline has 100 times the energy density of Lithium Batts are correct...how ever you all are missing the 2nd law of thermodynamics which covers efficiency.
Which is only 30-35%, meaning that, gasoline may be more energy dense, but you aren't going to get all that energy from it.
Everyone? You must not be paying attention. A good comparison for autos (and boats) is range per pound of storage.

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