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Old 08-31-2013, 09:41 AM   #1
Dela
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Default What kind of milage are you getting?

Just wondering if any of you have driven till "empty" and/or have a good idea of your available mileage on a full charge.

If you do know - please post voltage, mods and results.. thanks!
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Old 08-31-2013, 09:58 AM   #2
kernal
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Default Re: What kind of milage are you getting?

Last check was June 27th 2013. Ran 21.3 miles at an average of 11.4 miles an hour on paved cart paths with 450lbs of people on board. Temp was 82° and tires were 20PSI. Resting voltage at end of trip was 36.9v or about 65% of full charge remaining. Lots of stop and go with some 20MPH sprints. Batteries are Trojan 105s and were almost exactly 4 years old at the time (G9).

Series cart (36v) with 400amp Alltrax SPM, 4 ga wires, GE D297 high speed motor.
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Old 08-31-2013, 09:58 AM   #3
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Default Re: What kind of milage are you getting?

Dela, I was wondering the same thing a while back. JohnnieB posted a good idea and what I did. seeing as how a golf course would typically be in the order of 4.5 to 5 miles. I got in my car and charted a course around my neighborhood. It ended up be exactly 5.5 miles. you can see in my sig everything that has been done to my cart: 2 month old batteries (broke in), 36v, AllTrax SPM 48500 Controller, SD Solenoid, HD F&R Switch, 2 ga. cables, 6" lift, 23" tires, AMD 7126 Raptor High Speed Motor.

with a full charge, and after letting it set for at least 12 hrs. I got in my cart and ran the route twice. Most of it at full speed. That's 11 miles. I parked it and set it set for 30 minutes to let the pack settle.....checked the amount of "gas" in the tank and it was at 90%. Seeing as how I don't let my cart go below 70%, I would like to hope I can get at least another lap or so, which would bring me up to the 16.5-22 miles.
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Old 08-31-2013, 11:07 AM   #4
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Default Re: What kind of milage are you getting?

I've done some mid-range (8 to 13 miles) testing with various setups I've had, and extrapolated max range from that data, but haven't made any full distance tests.

My batteries stay on float charge, so what I originally did was drive to the end of the road and back, wait half an hour and then record the At-Rest voltage. Drive around for an hour or so, wait another half an hour and record the At-Rest voltage. I used a GPS for distance traveled.

I interpolated the 10% increments on the SoC charts to make a list of voltages at 1% steps, so I can calculated AH used fairly closely and I measure "Mileage" in AH used per Mile. (AH/Mi)

I found that considering the batteries fresh off float charge 100% charged and driving for a mile or so and waiting half an our to get a true At-Rest voltage reading, didn't make much difference in the AH/Mi findings, so I now just accept the batteries are fully charged when they come off float charge instead of being greater than 100% and needing to be discharged slightly to get on the charts.

By dividing the AH/Mi into 1/2 the battery packs AH rating (50% SoC), I can project what the max range is, but there are a ton of factors involved, so I don't know how valid the number is. I use if for comparison between different setups and driving conditions.

Stock PDS in Freedom mode averaged about 4.61 AH/Mi with a 24.4Mi range.
In Mild Hill mode (Regen braking) the average was 4.21 AH/Mi with a range of 26.7 Miles.
Note: 18.3" tall tires and 2Ga cables with 6 x 6V 225AH batteries (Trojan T-105)

Same setup except DCX400 controller and 400A solenoid. (Max sustainable speed on level ground = 24MPH)
3.72 AH/Mi for a range of 30.3Miles.

Upgraded to 42V battery pack - 7 x 6v 245AH batteries (Exide GC-145) - Max Speed 28MPH
Averaged 3.45 AH/Mi for a range of 35.5 miles.

Stock PDS motor bit the dust, taking controller with it. (Over-revved it going downhill)

Replaced with DCX500 and D&D ES-76-51 motor.
Pushing it hard, it uses 4.32AH/mi for a range of 28.8Miles.
Driving it normally, it uses 3.56AH.Mi for a range of 34.4 Miles.
I lost a bit of range, but acceleration is better and top speed is about the same. (I try not to exceed 6500RPM, which is about 28MPH on 18.3" tires)
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Old 08-31-2013, 11:16 AM   #5
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Default Re: What kind of milage are you getting?

Quote:
Originally Posted by Sir Nuke View Post
..............
with a full charge, and after letting it set for at least 12 hrs. I got in my cart and ran the route twice. Most of it at full speed. That's 11 miles. I parked it and set it set for 30 minutes to let the pack settle.....checked the amount of "gas" in the tank and it was at 90%. Seeing as how I don't let my cart go below 70%, I would like to hope I can get at least another lap or so, which would bring me up to the 16.5-22 miles.
I don't know the AH rating of your battery pack, but you only used 10% of their storage capacity in 11 miles, so that would project to about 33 miles if you took them down to 70% SoC.

The actual range would be less since the power (Watts) produced by each AH gets less as the pack voltage decreases, but it would probably be in the upper 20's.
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Old 08-31-2013, 11:22 AM   #6
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Default Re: What kind of milage are you getting?

Quote:
Originally Posted by kernal View Post
Last check was June 27th 2013. Ran 21.3 miles at an average of 11.4 miles an hour on paved cart paths with 450lbs of people on board. Temp was 82° and tires were 20PSI. Resting voltage at end of trip was 36.9v or about 65% of full charge remaining. Lots of stop and go with some 20MPH sprints. Batteries are Trojan 105s and were almost exactly 4 years old at the time (G9).

Series cart (36v) with 400amp Alltrax SPM, 4 ga wires, GE D297 high speed motor.
you forgot relative humidity and wind speed/ direction ,LOL
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Old 08-31-2013, 01:59 PM   #7
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Default Re: What kind of milage are you getting?

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you forgot relative humidity and wind speed/ direction ,LOL
Relative humidity > 80%. Atlanta in the summer is MUGGY! Go outside, stand in the shade and you are in a flop sweat in a couple of minutes.
Winds calm. Split windshield was open. Small American flag that starts waving about 3 mph and probably adds miniscule drag approaching 20MPH.

Seriously, after living with this cart for 13 years I have found the variables that affect range the most are: throttle technique, total weight and temp. Any one of the three will easily decrease range by 15%. Running the cart in the same conditions at 60° produces a noticeable reduction in range. In fact I believe a person should be careful about replacing batteries in the winter because they might not be as bad as you think. After the big three is tire pressure which also affects speed.

I have also proven to myself the importance of taking care of the batteries and wires/connections. Water level is critical. Keep them charged.

Couple of assumptions I have made about sparkys. The motor is suicidal and will blow up given a chance. The batteries when assembled as a pack are deceitful and will lull you into a pattern of water consumption that they will change as soon as they think you have been trained.

Your mileage may vary.
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Old 08-31-2013, 02:21 PM   #8
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Quote:
Originally Posted by JohnnieB View Post
I don't know the AH rating of your battery pack, but you only used 10% of their storage capacity in 11 miles, so that would project to about 33 miles if you took them down to 70% SoC.

The actual range would be less since the power (Watts) produced by each AH gets less as the pack voltage decreases, but it would probably be in the upper 20's.
Thanks JohnnieB, my batteries are Interstate U2200's and seeing as how I only use my around the subdivision, on a weekend going fishing ..... I might go 10 miles .... so I will be good to go for a long time, and the cart is always plugged in regardless how long or short the ride is.

The Master of All Things has Spoken
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Old 08-31-2013, 02:42 PM   #9
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Default Re: What kind of milage are you getting?

Thanks for replies..

Today wifey and I ran out to the Everglades, mostly paved roads but about a mile of dirt with a few mild hills.

I went full throttle entire time, got about 9 miles and was at 34 volts, getting really sluggish.. Within 5 minutes I was at 21 volts, could not make it over a 4 foot tall, 50 degree incline hill... Cart was dying fast.

Luckily I have my onboard charger and retractable cord, stopped at a pavillion plugged in and chilled for about 20 minutes, barely made it the extra 3 miles home, was dead for the last half mile, a guy mowing a lawn literally passed us on our street


What kind of things can I do to increase mileage?
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Old 08-31-2013, 03:54 PM   #10
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Default Re: What kind of milage are you getting?

I peeked at your build thread. If I read it right, you've got a series cart with a D&D high speed motor, an AXE type controller (Didn't see Amp rating), 22" tires and a set of Crown CR-190 (8V - 190 AH) batteries.

Your battery pack is about as high of an AH capacity you can get using 8V batteries. Using Trojan Ranger 160 batteries (8V - 204AH) would up the range a little, and going to 8 X 6V could increase it by nearly 50% (see attached chart), but you've got relatively new batteries.

You've also got relatively new cables, but are any cables or connections getting hot or very warm?
If so, fix them, power is being converted to heat rather than distance.

Tires 22" tall take more amps to turn, but travel further for each revolution, so tire height is more or less neutral for range.
However, there are some low pressure tires (<15PSI max pressure) that are amp hogs that will reduce max speed and max range.

Obviously you are not getting the range you would like, but I'm not sure why either. Probably it is a combination of factors.

-------
BTW: A 50 degree hill might be too steep to be climbing in a lifted cart. You'd be in emanate danger of flipping the cart over backwards since the center of gravity is greater than 45° above level.
Maybe you meant 50% grade. (see chart)

---------
Also, the absolute lowest you should ever take a battery under load is 1.50VPC (Volts per Cell). Going below that can do irreversible physical damage to the plates. For a 48V pack, 1.50VPC is 36.0V.

When battery manufacturers do non-destructive testing on their products they typically stay above 1.75VPC, so I try to stay above that when climbing hills. That would be 42.0V for a 48V pack.

-------------
Added:
When did you read the 34V? Right after you stopped or did you wait half an hour for the battery voltage tor recover?

If that was an At-Rest voltage, your batteries were less the 10% SoC!!!!!
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