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02-27-2018, 10:16 PM
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#1 |
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Not Yet Wild
Join Date: Oct 2016
Posts: 30
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Run time
Does running your cart at full speed vs. running it about 3/4 cause you to get less distance/lower miles on a charge? It seems when I go full out the meter drops faster than when I go about 3/4 over the same mileage
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02-28-2018, 07:02 AM
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#2 | |
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Master of All Things
 Join Date: May 2013
Location: West Columbia, Texas
Posts: 18,001
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Re: Run time
Quote:
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02-28-2018, 07:31 AM
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#3 |
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Getting Wild
Join Date: Jan 2012
Posts: 147
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Re: Run time
I don’t think that is correct. Amperage is inversely proportional to motor RPM. So your motor pulls the highest amps under load at 1 rpm.
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02-28-2018, 09:02 AM
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#4 |
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Not Yet Wild
Join Date: May 2013
Posts: 7
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Re: Run time
We're all waiting for ... JohnnieB !! He'll set us straight.
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02-28-2018, 09:47 AM
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#5 |
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Happy Carting
Join Date: Dec 2007
Location: Southern California
Posts: 73,419
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Re: Run time
Running at full throttle will use less amperage than slower speeds if everything is working as it should be in your cart.
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02-28-2018, 11:22 AM
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#6 |
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Techno-Nerd
Join Date: Jun 2011
Location: West Virginia
Posts: 19,654
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Re: Run time
An electric cart gets better range at less than top speed for several reasons.
Mechanical drag (wind resistance, rolling resistance, etc.) increases as speed increases. Carts have the aerodynamics of a barn. Motor efficiency is less at both the low and high ends of the RPM spectrum. There may be up to about 20% difference in efficiency between mid range and top end RPM. Amps = torque and motor amps exceed battery amps when the PMW output from the controller is less than 100% duty cycle. This is due to the flywheel effect when pulsed DC is being fed to the motor. The sweet spot will vary from cart to cart, but getting the best range is driving at something less than top speed and 100% throttle. |
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02-28-2018, 01:02 PM
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#7 | |
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Master of All Things
Join Date: May 2013
Location: West Columbia, Texas
Posts: 18,001
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Re: Run time
Quote:
Thanks Johnnie.....I knew I wasn't crazy.....at least about this specific subject anyway! LOL |
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02-28-2018, 08:14 PM
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#8 | |
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Techno-Nerd
Join Date: Jun 2011
Location: West Virginia
Posts: 19,654
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Re: Run time
Quote:
 The devil is in the details and you can go crazy trying to figure out some of this stuff. |
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02-28-2018, 09:49 PM
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#9 |
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Happy Carting
Join Date: Dec 2007
Location: Southern California
Posts: 73,419
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Re: Run time
To have a comprehensive discussion on this subject we would need specifics. I think it is not right to assume that if you are driving slower you are automatically consuming less amperage. There are plenty of log files that show the opposite.
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03-01-2018, 09:57 AM
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#10 | |
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Techno-Nerd
Join Date: Jun 2011
Location: West Virginia
Posts: 19,654
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Re: Run time
Quote:
2. I agree. However, how many yards the cart travels per amp consumed depends (in part) on what percentage of that amp passing through the motor is converted to motion vs the percentage converted to heat. 3. I agree. In general terms, the higher the RPM the less the amp flow. Especially true for series motors, but not so much for sepex motors. The attached graph is for generic brush type DC motors and shows how the various factors overlap. Blue line = RPM vs Torque Red line = RPM vs Amps Green line = Efficiency (ratio of motion to heat produce per amp) Brown line = HP produced |
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