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06-13-2019, 08:46 AM | #11 |
Just Gone
Join Date: Sep 2015
Location: North Carolina
Posts: 3,549
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Re: What is the max acceptable voltage on a 72V D&D motor
You could always charge the 10 modules to 4v/cell and get plenty of life out of them. You'd be running a 72v motor at a max of 80v.
I and many other members on here are running our 48v motors at or close to 58v without issue. |
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06-13-2019, 01:27 PM | #12 | |
Techno-Nerd
Join Date: Jun 2011
Location: West Virginia
Posts: 19,654
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Re: What is the max acceptable voltage on a 72V D&D motor
Quote:
Many people run 36V motors at 48V, which is 33.3% overvolting, but I have no idea how much overvolting a 72V can tolerate. |
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06-13-2019, 02:13 PM | #13 |
Happy Carting
Join Date: Dec 2007
Location: Southern California
Posts: 73,406
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Re: What is the max acceptable voltage on a 72V D&D motor
With more volts comes less amps. Amps make heat and heat kills motors. Volts makes rpms and excessive rpms kill motors too... there is a fine line somewhere here. If I had a 72v motor I would sooner run it on 84 than 48. Keep us posted.
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06-13-2019, 07:22 PM | #14 | ||
Techno-Nerd
Join Date: Jun 2011
Location: West Virginia
Posts: 19,654
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Re: What is the max acceptable voltage on a 72V D&D motor
Quote:
Electrically, DC motors are made up from several lengths of wire, a few carbon brushes and a copper commutator, none of which are particularity voltage sensitive. However, when you are upping the voltage and making the motor work harder, you are upping the amps and more amps generate more heat and heat kills motors, so there is a limit as to how much the voltage can be increased. Going from a 77V fully charged FLA pack to a 83V Lithium pack is less than a 10% increase in voltage. (7.8% actually.) More importantly, what is the max kW you can hit the motor with from a 72V FLA pack vs how many kW from a 83V lithium? Quote:
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06-18-2019, 08:12 AM | #15 |
Gone Wild
Join Date: Jan 2013
Location: Saint Petersburg, FL
Posts: 2,089
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Re: What is the max acceptable voltage on a 72V D&D motor
Not to counter Johnnie... He's forgotten more about this than I'll ever know...
Consider he'll have nine 8V anchors he's getting rid of.. That'll trim the mass of the cart immensely and make the work load on the motor less. Unless he's doing something stupid (like I am prone to do) then I would imagine he's going to be pulling less amps than before. |
06-18-2019, 12:16 PM | #16 | |
Techno-Nerd
Join Date: Jun 2011
Location: West Virginia
Posts: 19,654
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Re: What is the max acceptable voltage on a 72V D&D motor
Quote:
Conversely, the foot tends to get heavier as cart performance gets better. So with a much lighter cart and a little higher voltage, he might have the capability to pass more amps through the motor, but not the opportunity. |
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06-18-2019, 01:03 PM | #17 | |
Gone Wild
Join Date: Jan 2013
Location: Saint Petersburg, FL
Posts: 2,089
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Re: What is the max acceptable voltage on a 72V D&D motor
Quote:
As to the OP, the most voltage sensitive part of a sepex cart is normally the controller. If your controller can handle over 92v then I'd go with an 11 pack of leaf cells (or equivalent Chevy Volt cells) charged to 4.15vpc max for a 91.3v pack max. As mentioned earlier, we overvolt 36v motors all the time at 48v and I'm overvolting my 48v motor with my 58v pack. If you're worried about it, stick with a 10 pack of leaf cells for 83v. Another option is to trim back the max amps setting in your controller to avoid over taxing the motor and therefore causing too much heat. You may well find that at 83v or 92v with 4 or 5 hundred less pounds in the cart that you really don't need nearly as many amps. |
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