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Electric power is not there yet for leaf blowers and powerboats.
Weed eaters and cars are a different story. |
Originally Posted by CougarMarkus
(Post 4945056)
Hi Andrew,
thank you for your answer. How many horsepower had the princeton electric speed boat? The battery will be made by myself I guess, maybe 27200 Sony US VTC 6 cells, as I have written before I have made some electric motor bikes. One motorbike battery had 600 cells inside and had a capacity of 6.5 kWh and a weight of 32 kg so around 44 of these packs should fit in the boat. This bike was able to produce 50 horsepower and you could go at least 1 hour on the track. Bye the way this picture was made 2015 long time before Stark Vark. https://cimg6.ibsrv.net/gimg/www.off...92bf024a30.jpg That’s a nice looking bike and battery! Especially for building it at home. With newer 21700 cells you could improve the energy density of that dirt bike pack a decent bit. Depending on if you want more power or range there are a ton of cell options today. Any of the tabless 5 ah 21700 power cells would have more than enough power for you (RS50, 50XG, JP50 are a few). Or you could look at the Molicel P60B which is a great combo of power and energy (although they are very new and likely to be expensive). There are also some new cells like the BAK 65E which is an energy cell that still has decent discharge capability. That would give you the best range but is also likely to be a bit expensive and hard to source in the near future. All that said I think it’s a really cool project but as others have mentioned it going to be an uphill battle to get what you want out of that hull. The only platform that would be sorta useable for an electric speedboat would be a newer outboard Cat with a big tunnel to handle the extra weight. Even then with today’s battery tech it’ll struggle to do more than 60 miles on a charge. With the absolute state of the art battery pack 80-90 miles would be achievable. I don’t want to dampen your plans but if you want to make something electric it may make sense to start with a smaller speed boat for more local runs and then step up from there. Let me know if you want any suggestions for motors or inverters. We have looked at some that can do ~1700 hp peak and are the size of an inline 4 engine. |
There is a reason Formula E boat racing sucks so much 😂
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Originally Posted by Markus
(Post 4945088)
Electric power is not there yet for leaf blowers and powerboats.
Weed eaters and cars are a different story. |
Originally Posted by mutt2jeff
(Post 4945102)
There is a reason Formula E boat racing sucks so much 😂
Do these boats have closed cockpits so they can’t help themselves by paddling, or because they’re embarrassed when they’re not going anywhere? |
Hi Andrew, thanks for the tip with the 21700 cells. You are right if the battery is that big it don't have to be the high current cell better less current and more capacity. I found a INR 21700-50S with 5000 mAh. 31,600 cells would weight 2275 kg an have 569 kWh. Max drain would be 35 A per cell. If I calculate right it could bring 3981 hp. The cells would cost about 106,000 €. Is at least half capacity what Plavutka thinks, sure 1000 kWh would be better but the weight is important as well.
The controller I mentioned was a Sevcon Size 10 but as Sevcon belongs to Borgwarner it would be maybe possible to get the SiC-PP with up to 900V and 740 Arms. I will put in a picture of it. Sutphen 30 wanted to know what motor I will use. I will also attach some pictures, it will be a DIY motor with the Borgwarner SiC-PP it could bring up to 1600 Nm and 3500 rpm. 586 hp in theore. |
I see the Hi-power inverter can go up to 740 amps,,whats the continuous amp rating?
I take it this motor you want to use is cheaper than a couple of axial flux motors ganged together? |
Originally Posted by Andrew56
(Post 4945090)
Hey Markus, the current record boat made 182 hp (from the battery) and we just made 305 hp (battery) on a load disk last week. The original boat was a 400 volt system and new one is 700 volts. Around 580 volts under load and can do a bit over 400 amps.
That’s a nice looking bike and battery! Especially for building it at home. With newer 21700 cells you could improve the energy density of that dirt bike pack a decent bit. Depending on if you want more power or range there are a ton of cell options today. Any of the tabless 5 ah 21700 power cells would have more than enough power for you (RS50, 50XG, JP50 are a few). Or you could look at the Molicel P60B which is a great combo of power and energy (although they are very new and likely to be expensive). There are also some new cells like the BAK 65E which is an energy cell that still has decent discharge capability. That would give you the best range but is also likely to be a bit expensive and hard to source in the near future. All that said I think it’s a really cool project but as others have mentioned it going to be an uphill battle to get what you want out of that hull. The only platform that would be sorta useable for an electric speedboat would be a newer outboard Cat with a big tunnel to handle the extra weight. Even then with today’s battery tech it’ll struggle to do more than 60 miles on a charge. With the absolute state of the art battery pack 80-90 miles would be achievable. I don’t want to dampen your plans but if you want to make something electric it may make sense to start with a smaller speed boat for more local runs and then step up from there. Let me know if you want any suggestions for motors or inverters. We have looked at some that can do ~1700 hp peak and are the size of an inline 4 engine. |
Originally Posted by Smarty
(Post 4945122)
I find this very interesting this is a topic that I don’t know much about, what would be the physical weight in pounds for the 1700 hp electric motor that would be the size of an in-line four-cylinder motor?
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