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  #31  
Old 05-25-2012, 02:55 PM
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frodus frodus is offline
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Default Re: Curtis 1238, AC 50 Sluggish Performance

Just got off the phone to ask a bit about things. The new Curtis is 144V 500A with an isolated 12V side (you supply 12V from DC-DC and everything is now isolated).

They're still working on everything and there's no ETA on arrival of the new controllers or if those specs are final or final specs on the motors.
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Last edited by frodus; 05-25-2012 at 04:47 PM.
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  #32  
Old 05-25-2012, 04:35 PM
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Default Re: Curtis 1238, AC 50 Sluggish Performance

Thx Trav.

Make me miserable.

Miz
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  #33  
Old 01-04-2013, 10:00 AM
914EV 914EV is offline
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Default Re: Curtis 1238, AC 50 Sluggish Performance

Hi Travis,

I am converting a 914 and using an AC-31 motor and Curtis 1238-6501 controller. From your statements, it sounds as though I can reprogram the controller to operate at 108 VDC with the same limit for regeneration. Is that a correct assumption?

Thanks,

Bill
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  #34  
Old 01-04-2013, 10:07 AM
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frodus frodus is offline
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Default Re: Curtis 1238, AC 50 Sluggish Performance

You should not OPERATE it at 108V, the controller maxes out at 108V, so you need to be below that to allow for regeneration. Tha max number of lifepo4 cells I'd do on that would be 30, but it might be possible for 32 if you make sure your batteries settle after charging before you go out (turn on DC-DC to load them).
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  #35  
Old 03-12-2013, 08:09 AM
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mizlplix mizlplix is offline
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Default Re: Curtis 1238, AC 50 Sluggish Performance

It is now almost a year later and Curtis has not coughed up that new controller....

The new rumor is "Any time now" and another source says "end of 2013".

Any concrete information out there about the new 144Volt controller?

TY, Miz
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  #36  
Old 03-12-2013, 09:32 AM
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Default Re: Curtis 1238, AC 50 Sluggish Performance

A large batch is on it's way to Curtis USA to be tested. They will ship to HPEVS once tested.
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  #37  
Old 03-14-2013, 05:21 PM
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Default Re: Curtis 1238, AC 50 Sluggish Performance

Quote:
Originally Posted by frodus View Post
A large batch is on it's way to Curtis USA to be tested. They will ship to HPEVS once tested.
It will be very interesting to see the performance graphs from the AC-50 and AC-75 with the new 144V controller. If they make a 650A model it could be a 94kw system (if you had minimal battery sag)
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  #38  
Old 03-14-2013, 09:43 PM
tomofreno tomofreno is offline
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Default Re: Curtis 1238, AC 50 Sluggish Performance

Quote:
Originally Posted by Bowser330 View Post
It will be very interesting to see the performance graphs from the AC-50 and AC-75 with the new 144V controller. If they make a 650A model it could be a 94kw system (if you had minimal battery sag)
They rewound an AC50 to make the AC51 they have in the scion with the new controller (Edit 3/23/13: Bill says they have put the AC51 on the back burner now), and there is an AC76 for use with it as well, with similar peak torque as the AC75. Iirc, the AC51 has around 20% higher peak torque than the AC50, and about 3k base speed - rewound for higher torque with the 500A peak current controller. I think the AC50 would have base speed over 5k with the new controller, but only about 80 ft-lb peak torque. Sure wish Curtis had given the new controller higher peak current. With 500A, it has the same peak power as the 1238-7601 controller.

Last edited by tomofreno; 03-23-2013 at 11:56 AM.
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