32kW rechargeable batteries

Hello gd34

You need to supply further information, please.

1. Shape of ships hull - picture would be helpful

2. Cross-sectional area at widest point.

3. Hull line mark at water/air interface point.

4. Speed required

5. Where/how are you intending to recharge battery

6. Size, RPM, and voltage/current of motor you are using

7. Size and type of propeller

8. Are you intending a return journey, or a one-way-trip

9. Will the boat be used on freshwater lake

10 Will the boat be used on saltwater

11. Further specifics are needed, but the above will do as a start.

Please reply, with

Kind Regards....

Thanks, Sparkstation - I'll get that information and get back to you ASAP.

Hi Sparkstation,

The answers to your questions are below. Any help would be greatly appreciated.

1. Shape of ships hull - picture would be helpful

24 degree V

2. Cross-sectional area at widest point.

8ft

3. Hull line mark at water/air interface point.

28ft

4. Speed required

75mph

5. Where/how are you intending to recharge battery

110volt or 220volt shorepower hookup

6. Size, RPM, and voltage/current of motor you are using

No decision made yet 7. Size and type of propeller

4 blade 16 inch diameter

8. Are you intending a return journey, or a one-way-trip

one way

9. Will the boat be used on freshwater lake

saltwater, offshore conditions

10 Will the boat be used on saltwater

Hello gd34

Thanks for your reply, with details as above.

Just a few more details needed, please.

1. Is your craft to be remotely controlled?

2. If not, how many persons are on the craft?

3. As the trip is to be one-way only, how will the person/s intend to return?

4. What is your intended cargo or payload?

5. Advise which offshore ocean or sea intended for use, as salinity varies widely, and Froude's Law has major input into answer.

Kind Regards....

Hi Sparkstation,

The answers to your questions are as follows:

1. Is your craft to be remotely controlled?

No.

2. If not, how many persons are on the craft?

There will be 2, sometimes 3 people on the craft.

3. As the trip is to be one-way only, how will the person/s intend to return?

They will be picked up by another boat.

4. What is your intended cargo or payload?

There will be no cargo on the boat as it is a racing boat; however, the weight of the boat is approximately 10,000lbs

5. Advise which offshore ocean or sea intended for use, as salinity varies widely, and Froude's Law has major input into answer.

The boat will be racing in the Atlantic Ocean (from the mid-Atlantic area such as Baltimore, Maryland down to Key West, Florida). The boat will also race from Miami to the Bahamas. Besides the Bahamas race, the boat will never race more than a few miles offshore.

Your continued assistance is GREATLY APPRECIATED.

If i have understood you , you want to supply an electric motor of 42 ~hp that wants from a 12v battery almost 2700A .Even if you supply the boat with 48V you need~700A, if your supply is 220V you need ~145A How can you do it that?

Target electric forklift companies. The battery would prob be to heavy for your application. But give it a try.

Thanks for the tip, Madness. I'll inquire into it.

If money is no object check into the more exotic battery types. They have the benefit of lower weight for the power supplied.

Hello again gd34

Your main problem is going to be the Power/Weight/Speed/Power Duration problem.

You need high-density storage, with minimum weight for the battery bank plus the electric motor plus controls.

I have done considerable research, and most existing battery technology is just not equal to the task you need.

However, please read the quote below, visit the weblink, and perhaps try and purchase battery, motor, control unit etc from Subaru, who seem well ahead in the race for an electric car.

<"The Subaru R1e employs fast-charge lithium-ion battery technology that eliminates typical lithium ion battery issues of charge memory loss, allowing partial charges and quick charges that do not decrease battery life.

The battery pack, originally developed in partnership with NEC Corporation, uses lithium manganese oxide spinel (LiMn2O4) as the cathode active material. The crystalline spinel structure makes the battery resistant to overcharging and provides high thermal stability. A 346V battery pack powers the 40kW drive motor, and can recharge to 80% capacity in 15 minutes.">

The above quotation from: http://www.treehugger.com/files/2008/03/subaru-electric-cars-r1e-g4e-new-york.php

See how you get on, with that - the NEC battery technology is the very latest.

You may need more than one battery bank, for your application.

Kind Regards....

Hi Sparkstation,

Thanks so much for the info. I'm going to call Subaru on Monday to follow up. I know this is a vexing problem, but I'm confident that it's a possibility - the right technology just has to be brought together.

Regards,

gd34

try out www.altairnano.com for different type of lith ion battery. 1000 watts per kilo they claim. or Tavrima ultracapacitors. let us know how you choose. I am [we are] embarking on an electric car project shortly.