Battery questions

[scottyb]

Originally Posted by bird6246

just understand 48 volts doesn't necessarily make your cart faster. It will make your drive time longer. think of the batteries as a fuel tank. more voltage bigger fuel tank.

If you are referring to somebody suggesting to run a 36v motor on 48v, a pretty commonly done thing here on bgw . 48v will induce a 36v motor to make 33% more rpms than it did on 36v. The result is 33% more speed

DC motors consume amperage when running. Run-time is an equation of consumption and capacity. A 6v battery holds more amperage than an 8v battery. So there are more amp hours (a standard run-time value) in a 6v battery than 8 or 12 volt batteries.

[mgray70]

Volts= speed amps= torque, I would have to disagree. Also the only way going 48 would increase run time would be if you went with the ( 6 volt set up.

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[mgray70]

Scotty we replied at the same time. Mine was for bird, not you.

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[JohnnieB]

Originally Posted by scottyb

1. If you are referring to somebody suggesting to run a 36v motor on 48v, a pretty commonly done thing here on bgw . 48v will induce a 36v motor to make 33% more rpms than it did on 36v. The result is 33% more speed

2. DC motors consume amperage when running. Run-time is an equation of consumption and capacity. A 6v battery holds more amperage than an 8v battery. So there are more amp hours (a standard run-time value) in a 6v battery than 8 or 12 volt batteries.

1. I agree. More voltage = More RPM.

2. What you say is true, but it is a bit more complicated since run-time is actually based on kWh stored, which is Volts times Amp-Hours of storage.

Both a 36V battery pack made up of six 225AH 6V batteries and a 48V battery pack made up of six 170AH 8V batteries store about the same kWh and will have roughly the same run-time.

Attached is a list of commonly used 6V, 8V and 12V golf cart batteries showing the kWh in 36V, 42V and 48V configurations.

[Volt_Ampere]

Going to 48 can increase runtime if you don't consume all of the upgrade in performance. As JohnnieB says, stored energy is Amp Hours * Volts (Watt Hours) so increasing the volts at same amp hours is a stored energy increase.
Running on 48V vs 36V will generate lower battery amperage at same cart speed.

[Golf cart guy]

The reason why manufacturers went to 48 volts was to increase distance. As voltage goes up, amps go down. The Amp draw is less on a 48 volt system (stock). Since batteries are storing amp hours as stated, the less draw, will give you longer run time.
We can blame California for this change as in 1997 a law was passed on large quantity purchase of small engine gas fleets.

[rabbitreborn]

Originally Posted by Golf cart guy

The reason why manufacturers went to 48 volts was to increase distance. As voltage goes up, amps go down. The Amp draw is less on a 48 volt system (stock). Since batteries are storing amp hours as stated, the less draw, will give you longer run time.

lmao.... that's funny......

In 2001, EZGO AND CLUB CAR actually worked together and had an independent company do a series of tests in the Villages because they were losing market share to Club Car over the 36v/48v debate. It was proven over the course of almost a month of testing that the EXGO 36v TXT (both Series and PDS) would out distance the 48v Club Car DS by at least 5 miles (and as much as 10 miles). The club Car would beat the EZGO off the line and in speed, but the EZGO's consistently outdistanced the Club Cars EVERYTIME. Trojan even got in on it and explained that the 6 volt battery had a higher reserve capacity than their 8v batteries. EZGO for a number of years after that purposely broadcast this to prospective customers in the villages as a marketing tool do to the sheer size of the villages (at the time to go from 1 end of the community to the other it was a 15 mile trip via cart path, tunnels and in some cases roadway)

The really sad part was that Par Car outperformed both the EZGO's and Club Cars in both speed and distance due to them running 48v with 8 6v batteries with 13 inch tires.

[JohnnieB]

Originally Posted by Golf cart guy

1. The reason why manufacturers went to 48 volts was to increase distance.

2. As voltage goes up, amps go down. The Amp draw is less on a 48 volt system (stock). Since batteries are storing amp hours as stated, the less draw, will give you longer run time.

3. We can blame California for this change as in 1997 a law was passed on large quantity purchase of small engine gas fleets.

1. The reason was to increase profits.

2. Only if the amount of energy stored in the 48V battery pack is greater than the amount of energy stored in the 36V battery pack. For example, my 42V battery pack has greater range than any 48V battery pack composed of commonly used 8V or 12V batteries.

3. Not quite sure how a law governing small gas engines impacts the battery pack voltage of electric golf carts.

[Bscheu]

Thanks for the info guys. I ended up just getting a new set of 36v batteries. Is this type of charger reparable or better to just buy new?

[mutant]

junk=buy a dpi from scottyB ...i did and love it....