Eric, Can we go over this again it is late and my brain is not working as well as it should.
I found what I think is the motor I will use. It is called the Beast by GE 5BC49JB 1134 or 32 or sometimes by this # D-394 or 5. The specs that I found are 36v 275a = 9 hp 1600 rpm or 48v = 400a = 15hp 2200 rpm. These numbers are very close to the Atomic 4 in fact quite a bit better. I could maybe re-pitch the prop or go with a 3 blade.
I also figured out amp hr ratings for batteries. 240 amps 6v + 6 batteries = 240 amp hrs at a 20 hr rate. 25 amp?
I hardly think I will be running this thing at 9.9 kwatts and the motor does not give hp ratings for less than. I am not sure if I can just cut it in half or fourths. On the Trojan site they list the T125 @ 75 amps for 132 min. I know I can run a golf cart into town 5 miles golf and come back. I think time on the cart would be close to this number. For a bolt right on almost I think it is worth a try.
Dan
--- In electricboats@yahoogroups.com, "Eric" <ewdysar@...> wrote:
>
> Dan,
>
> I'm sorry, my assumption was for 12V batteries. The bad news is that that each 6V 260Ah battery has only 1560Wh, so you can cut all of my results in half. And with smaller batteries, Peukerts has a bigger impact on delivered energy. Here's my last two tables adjusted for the 6V batteries.
>
> 6 * 260Ah @ 6V = 260Ah @ 36V = 9.4kWh
> 9.4Kwh * 50% depth of discharge = 4.7kWh
> 110A @ 36V = 3960W. 4700Wh/3960W = 1.18 hours
> With Peukert Effect for FLA = 0.7 hours @ 5kts (full thottle)
> 40A @ 36V = 1440W. 4700Wh/1440W = 3.26 hours
> With Peukert Effect for FLA = 2.47 hours @ 3kts
>
> 8 * 260Ah @ 6V = 260Ah @ 48V = 12.5kWh
> 12.5Kwh * 50% depth of discharge = 6250Wh
> 85A @ 48V = 4080W. 6250Wh/4080W = 1.53 hours
> With Peukert Effect for FLA = 0.96 hours @ 5kts (full thottle)
> 30A @ 48V = 1440W. 6250Wh/1440W = 4.34 hours
> With Peukert Effect for FLA = 3.52 hours @ 3kts
>
> Eric
No comments:
Post a Comment