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Old 06-22-2014, 07:07 AM   #1
BorisM
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Default run time between charges

Is it posdible to increase runtime of an alectric golf cart between charges? I read somewhere that people are adding additional barreries to their golf carts. How foes that work on a 48v golf cart?
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Old 06-22-2014, 07:37 AM   #2
yurtle
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Default Re: run time between charges

Assuming you have six 8 volt batteries, the best thing to do is wait until time to replace the batteries and get higher amp-hour batteries. You could also go with eight 6 volt batteries which is a little more effort, but will give you the most run time, assuming you buy higher amp-hour batteries.
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Old 06-22-2014, 07:39 AM   #3
sportcoupe
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Default Re: run time between charges

Cart run time is mainly determined by the capacity of the battery pack as measured in amp-hours (Ah). A cart with 225Ah batteries will have much more run time then a cart with 180Ah batteries with all other things being equal (wheel size, drive system and intended use).

A stock golf cart with new factory batteries should make 3 rounds of golf (around 20 miles) before needing recharged.

What do you have now and how far do you want to ride?
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Old 06-22-2014, 08:44 AM   #4
JohnnieB
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Default Re: run time between charges

I suspect you want to increase range, which is how long the cart will run on a single charge (run-time) multiplied by the speed the cart travels during that time.

There are two major factors that determine range.
1. Amount of energy stored in battery pack (Watt-Hours)
2. The cart's efficiency. (Watt-Hours used per mile)

Getting more stored energy is fairly straight forward. A 48V pack has 24 two volt cells in it, so you need bigger cells. The 2V cells are typically pack 3, 4 or 6 in a box (6V, 8V and 12V batteries respectfully). The boxes are pretty much the same size, so the more cells in the box, the smaller the cells. For the greatest storage capacity, you want the biggest cells.

Attached is a list of 48V battery packs made up of commonly available golf cart batteries. A 48V pack made up of 8V 170AH batteries roughly equates to a 36V battery pack made up of 6V 225AH batteries, so the is the baseline of comparison.

Yurtle's set up (8 x 6V-225AH) has about 32.4% range than the baseline.

Using the highest AH 6V batteries commonly available, you can get about 52.9% more range than the baseline 48V battery pack.


On the other hand, making the cart more efficient is more complex.

However, no matter what the cart's efficiency is, the way it is driven make a big difference in how many Watt-Hours are used per mile. The same factors that effect a cars MPG effect a carts WH/Mi.
Attached Images
File Type: jpg 48V kWh Comparisons.JPG (105.4 KB, 0 views)
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Old 06-22-2014, 10:18 AM   #5
yurtle
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Default Re: run time between charges

JohnnyB is correct about efficiency. How you drive really does make a difference. Hard acceleration is much more wasteful than a several second slower take-off, especially if you are doing a lot of start and stop driving.
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Old 06-22-2014, 10:21 AM   #6
yurtle
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Default Re: run time between charges

Just like a car, coast to a stop rather than keeping the pedal to the floor then braking hard.
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