Battery for outboard convertion

[Pompel79]

Hi
I am going to convert a gasoline outboard motor to electric.
I will be using this engine:
http://alienpowersystem.com/shop/80mm/c80110-sensored-outrunner-brushless-motor-80kv-6000w-2/

This speed controller:
http://em3ev.com/store/index.php?route=product/product&path=38&product_id=81

What kind of battery should I use?
Will this work? How long runtime I get with this battery?
http://em3ev.com/store/index.php?route=product/product&path=35&product_id=128
Hope someone can help me.

 

[major]

If you run at full power, 6000W, that battery (about 50V, 10Ah) will last 5 minutes. You'd be running at about 120A or 12C from the battery. That may be beyond the continuous discharge rating of the cells.

That pack uses a 40A BMS. So at 40A (~4C), it would be running at 2000W and go 15 minutes.

 

[wesnewell]

The motor is 6KW. The controller is probably 1KW or less with a max ouput of 40A, so ~2KW until the controller burns up or you run out of battery. And you'll only see ~3HP out of a motor rated for 8. You need a 60A 5000W controller run on 100V if you want to get the most out of the motor and not burn something up. You also need a battery that will supply 60A continuous. Trolling motors work great for bass fishing. As a main motor, not so good.

 

[Punx0r]

Also, to do anything like 6KW that motor will need hurricane-speed air flowing through it.

 

[Sunder]

Also, to do anything like 6KW that motor will need hurricane-speed air flowing through it.

Wow... Yeah. At the typical 80-90% efficiency, you're looking at generating the same heat as a heater on the "low" setting.

I know model airplanes and even cars can get extremely powerful motors into very small packages, but they literally have hurricane speed air directed over the windings, and even then, most advanced flyers would use telemetry to monitor temps and bring their planes in when it gets to high 70s... (This from a mate of mine who has won several RC hobby comps in Australia).