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Unread 01-14-2020, 12:04 PM   #1
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Default 72 volt Cushman

I have a 72 volt cushman with a Curtis 1236-6415 controller and a Mahle 3 phase AC motor in it. The label on the controller states the voltage is 48 - 80 and 350 amp. The motor states 45v 7.0 KW and DC 72 volts. My question is that is this controller programmed from EZGo to only run on 72 volts or is it able to work on any voltage from 48 to 80 volts? I have four of these carts and they get A LOT of use. The carts are 2017 with over 16500 miles and we just put in our second set of batteries. Wondering if they would be good lithium candidates for the simple fact of the mileage they get driven and the life of lithium over lead batteries. Any help would be great. Ive been reading all the posts on Lithium's and reading over at Battery U.
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Unread 01-14-2020, 12:36 PM   #2
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Default Re: 72 volt Cushman

Controller can be set to work in that voltage range but the motor is for a 72 volt setup so you need to stay close to 72 for it to work properly.
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Unread 01-14-2020, 12:45 PM   #3
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Default Re: 72 volt Cushman

You may get a better response on this if it were in the Lithium EZGO section.

I do not know that controller, but I would imagine if it says 48 to 80v it should operate on any V in that range. If you remove two of your 8V batteries and the cart still moves then you know it'll run on 56V too and 56V is probably lower than you want to drain your lithium pack anyway. I am assuming you were thinking of a 72V lithium pack?

An 18S pack at 4.15vpc is 74.7V. That's an easy number to get to using either 9 Nissan Leaf modules or a 12S and 6S Chevy Volt module.

Discharged to 3.25vpc gives you 58.5v. So if you want to discharge that far it'll still run. You will need a BMS that includes an LV cutoff because the controller will continue to drain the cells far below their intended minimum V.

This sounds like a really interesting project.
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Unread 01-14-2020, 12:48 PM   #4
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Default Re: 72 volt Cushman

But a 20S pack may be interesting too. 83V fully charged though, so I don't know enough about that controller to say if it'll accept that or no. Fully discharged a 20s will be 65v so probably a better V range for your motor as KGSC mentioned.
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Unread 01-14-2020, 01:29 PM   #5
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Default Re: 72 volt Cushman

Controller would work at 56 after you change the settings in the controller. It will operate in that range but you would need to make all the internal software changes so it knows the range. Low/high voltage cut off and the like
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Unread 01-14-2020, 01:44 PM   #6
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Default Re: 72 volt Cushman

If the controller would at 56 volts wouldn't the BMS take care of the LV shut off?
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