I agree with Steve that the quick answer is yes. But if you expect it to perform anything like it does today, then the answer is no.
The first thing to consider is your power requirement. If you spend any time at full throttle today (launching or getting up on a plane) then your electric motor should be able to push 120hp into the jet drive, even briefly. 120hp is 90kW of electric power. The problem is jet drives work more on hp rather than torque.
Let's say that you normally cruise at half power, that is still 45kW (60hp) from your drive system. So to cruise around, you'll need 150A out of a 300V battery, with peak loading of 300A.
Let's say that you want to cruise at 45kW for just one hour. Assuming you go with lead acid batteries, you'll need about 5000 pounds of Trojan T-105s (80 batteries, about $10-12k) to run at 45kW for 53 minutes to 60% depth of discharge. Switching to Lithium batteries, you would need about 1600 pounds of batteries (128 160Ah cells, about $28k) to cruise for 63 minutes to 80% depth of discharge.
I know that I just made some very general assumptions about your usage, but you can see where all of this is going. Even cutting your power requirements in half will leave you with considerable energy and system demand. Most of the conversions here are displacement boats replacing diesels that range from 10 to 35hp. There are some higher power conversions, but they are still primarily sailing auxiliaries, just larger boats.
I'm not saying that your project shouldn't be done, but it will come with considerable compromises.
Fair winds,
Eric
Marina del Rey, CA
--- In electricboats@yahoogroups.com, Steve Dolan <sdolan@...> wrote:
>
> I here Polyester and I think shirt and tie.. :o)
>
> The quick answer is yes. The long answer requires a number of questions.
>
> How fast do you expect it to go (you did say the word Speed)?
> Does it have a rudder? Most jet boats I thought had adjustable output of some sort.
> Can you handle a minimum of 6 12v bats weight?
> No prop boat will be interesting to fit..
> Does the hull design allow for a prop?
>
> Anyway some minimum things to think about.
>
> Steve in Solomons MD
>
>
>
>
> hello,
>
> I have a 23ft polyester speedcruiser, with a jet-drive. engine 120hp
> Is it possible to make it full electric ?
>
> I don't have any expierience with electric engines.
>
> Thanks for the replies.
>
No comments:
Post a Comment