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Old 11-19-2017, 08:14 AM   #1
Conradconrad
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Default Battery voltage vs distance

I thought I had a fairly good grasp on the relationship of battery pack voltage- state of charge vs distance cart is driven, however something seems to be off.

Ezgo txt with no lift, back seat, 17.5 inch street tires, 42v with alltrax 500 and a EMP custom motor. I've played with a few maps Chuck sent me and although I can hit 29mph, I decided to settle for a map that runs about 25mph with turbo off.

Yesterday we took what ended up being a 28 mile round trip. Cart was fully charged up. Two people with windshield down. Drove about 14 miles and stopped for a few hours and then returned.

I was amazed that after letting the cart sit for 30 minutes after the 28 miles it was 43.3v

That would mean percentage wise I was only in the upper 60% of battery discharge after 28 miles of driving? Could that be possible ?
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Old 11-19-2017, 08:39 AM   #2
Hossstyl3
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Default Re: Battery voltage vs distance

I would think so ! Especially if u got good batteries ! And good throttle control and driving habits.
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Old 11-19-2017, 08:58 AM   #3
Conradconrad
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Default Re: Battery voltage vs distance

I really thought range was going to be 28-30miles max. At this rate I should be able go over30miles before 50% state of charge
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Old 11-19-2017, 12:02 PM   #4
JohnnieB
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Default Re: Battery voltage vs distance

With 17.5" tall tires your cart is placing less than the stock mechanical load on the motor, so it will get good "gas mileage".

Cruising at about 80% of max speed also improves "gas mileage".

Not having turbo turned on doesn't allow controller to weaken the field as much, so the motor runs more efficiently and gets better "gas mileage".

PDS carts have regen braking, which puts some energy back into the battery pack and improves "gas mileage".

If you have Trojan batteries, 43.3V is 70% SoC, so 28 miles is 3/5 of the max range at 50% SoC. That works out to about 45 miles max range.

In a nutshell, you have several factors working in your favor for excellent range on a single charge.
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Old 11-19-2017, 02:30 PM   #5
Conradconrad
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Default Re: Battery voltage vs distance

I didn't know distances like that are possible
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Old 11-19-2017, 04:53 PM   #6
JohnnieB
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Default Re: Battery voltage vs distance

I forgot to mention traveling on relatively flat land and in a relatively warm climate also gives better "gas mileage".

Also, 46V is more efficient than 36V.

Sounds like you accidentally put together a cart that has better than average range.

When I was running a stock 36v PDS cart (except for 2Ga cables throughout), it averaged about 25 Miles.

When I switched to a DCX400 controller, it jumped to 29 Miles.

When I switched to a 42V-245AH battery pack it jumped to 42 miles.

All of these tests were over a mixture of on-road and cross country driving with hills and stop and go driving. Cart was not driven gently during the tests, so they were basically worst case scenarios.

I lost a bit of range when I switched motors, but got some of it back when I switched from a DCX controller to an XCT.

There are some guys running Lithium packs that get over 50 Miles.
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Old 11-19-2017, 07:17 PM   #7
Conradconrad
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Default Re: Battery voltage vs distance

That makes so much sense. Looks like your signature is due for an update thenas you no longer are 30+ and more like 40+ range

Thanks again for the information!
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