Help Needed with Fastest possible Electric JetSki Conversion

Boats, Jet Skis, Kayaks etc., including hovercrafts
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campbell1987
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Help Needed with Fastest possible Electric JetSki Conversion

Post by campbell1987 » Oct 19, 2017 5:26 am

Title says it all really, I have my eye on an engineless Yamaha GP1200R for converting to electric, My only question is with todays motor technology what would be the fastest i would be able to get out of an all electric ski with or without the help of gears, I have owned a 2004 seadoo gtx 185 before and liked it alot just hated the work involved for winterising etc and HATED filling the f***er up with fuel, I think batteries are the way to go, I've built a nice 52v 750w bbs02 powered mid drive downhill ebike with help from the guys over at pedalecs forum, (they pointed me here for higher powered builds so here i am :-)
Here's a pic of the bike..

https://drive.google.com/open?id=0BwNrE ... 3FHa3cwRVE

Anyway the plan here is build something to outrun a standard ski if possible, Just thinking with that big engine and fuel tank gone it leaves a lot of room for batteries and a decent motor, Plus i think i could keep the weight even lover down in the hull so should be a lot more stable to ride,

This really is just a thought at this stage, Im just hoping some folks here can help me make it reality.. ;-)

campbell1987
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Re: Help Needed with Fastest possible Electric JetSki Conver

Post by campbell1987 » Oct 20, 2017 7:15 am

Anyone any ideas? I know water and electric dont mix but that doesnt mean i should keep it low voltage, Ill just have all connections well insulated, would i be safe enough using LiPos or should i use the older style 18650 LiIon cells as they have a harder metal shell?

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amberwolf
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Re: Help Needed with Fastest possible Electric JetSki Conver

Post by amberwolf » Oct 21, 2017 1:58 am

Before you get to batteries, you need to know how much power you'll need from the motor system to drive the propulsion system and make the vehicle run the speeds you want.

If you know how many HP it used to be, you can use that as a base starting point, but I don't know if it's going to need more or less power than that as electric just to do what it did before. Then you need to figure out how much *more* power you need to make it go the speeds you want out of it. (it's probably not a linear relationship; it wouldn't be in air and water is probably worse).

There's a few threads in this forum section about various conversions and builds that discuss power levels and speeds, planing, water drag, etc., (none of which I really know anything about), which should help you figure out what you'll need.


Once you know what the continous and peak power levels ahve to be, *then* you can find or design a battery that can output at least that much without sagging in voltage or heating up.

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liveforphysics
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Re: Help Needed with Fastest possible Electric JetSki Conver

Post by liveforphysics » Oct 21, 2017 4:46 am

Nissan leaf motor is not a bad starting point, but still won't be fastest possible and the pack voltage I a boat may mean a pile of dead noob EV builders

Tesla motor rear motor would get you in the ballpark for fastest, but it has the same voltage drama/hazard. Buying a modern Zero SR/DSR and gutting it's drivetrain for your boat would likely get you something running with good results you enjoy using,but won't be fastest.
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campbell1987
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Re: Help Needed with Fastest possible Electric JetSki Conver

Post by campbell1987 » Oct 24, 2017 6:23 am

Next question.... Where can i buy a tesla motor.... I looked at that electric bike but its a bit outside my budget.... wouldnt have really said i had a budget till i seen that, :D Yes it would be a good motor but i dont have that much spare cash lyin about to buy a new bike just for 1 part, I dont mind splashing out on a decent motor though as i may use it for a few builds if it lasts, Guessing used parts from theses tesla cars are rare since they are so new, and i bet the cost bit new too. Just hope you dont tell me i need to buy a Tesla to strip for parts..lol

Quinc
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Re: Help Needed with Fastest possible Electric JetSki Conversion

Post by Quinc » Nov 27, 2017 2:13 am

You are going to need a water cooled motor and it is going to cost you way more then what you could buy a gas powered ski for.. But anyway check out the Gratis:
https://www.engadget.com/2017/03/08/fre ... atercraft/

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Re: Help Needed with Fastest possible Electric JetSki Conversion

Post by mrzed » Nov 29, 2017 10:44 pm

Yup, water cooled is the trick, and there's not much out there. Someone with skills and tools could come up with badass custom heat exchange setup to properly cool a suitably powerful electric motor. doubtless someone already is, and it will be released in a year or two by an existing oem like bombardier or a well funded startup.

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Re: Help Needed with Fastest possible Electric JetSki Conversion

Post by kbeck247 » Dec 21, 2017 6:23 pm

R-mamba has watercooled brushless motors and some really high power controllers as well for good prices. Also don't even look at the tesla powertrain...its so expensive. But if you have $10k to dump into powertrain, there is a controller system for the tesla powertrain. The ev-controls t1c. Its $3500 though. Powertrain from a tesla is $3-7k depending on where you can get a hold of it and which models. But the weight is really high which weight is more important in water than on land. A Nissan leaf motor is VERY powerful. In the car it is actually very underpowered. I have seen 300-400+ horsepower out of them and they have liquid cooling. Plus they weigh less. Look up the electric crx on youtube. That person builds up a controller to use on a Nissan leaf motor and drops it into a light weight car. As far as price goes, the leaf motor is a good cheap option. But before you decide, check the weight of your jet ski with everything out of it and get measurements of the space you have to work with. Then decide what can even fit in there... Jet skis don't have much space to work with when you figure in the controller, motor, and batteries. Based on your goals you are looking at small amounts of high discharge Lipo or a decent amount of high discharge lithium ion cells. With good 10c 18650's out now, I would lean towards the lithium ion cells. Give the measurements of your space so everyone knows what you have to work with.

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