marathon stops need help troubleshooting

[JohnnieB]

Originally Posted by smokey tennis shoe

Do these battery numbers seem ok?

They look pretty good. The At-Rest voltage is a bit imbalanced (0.19V between highest and lowest), but they even out under load (0.05V).

Fully charged At-Rest ought to be about 8.48V (If they are Trojan batteries), so some are a bit under 100% Soc and some are a bit over. What brand an AH batteries are they?

A few back to back charge cycles might even them out some, but other than that they seem healthy.

[smokey tennis shoe]

Thanks JB

So I will try a new f/r switch in this cart and see if it fixes the problem.

By the way, can you please explain exactly the conditions when you say " at rest?"

[JohnnieB]

Originally Posted by smokey tennis shoe

By the way, can you please explain exactly the conditions when you say " at rest?"

There are three sets of battery voltages that can be measured.
1. On-Charge: The battery or battery pack voltage while they are being charged. For a 48V pack, this will typically climb to about 60V before charger shuts off.

2. Under-Load: The battery or battery pack voltage while they are being discharged. The more amps being drawn from the battery, the lower the voltage drops to. Typical goal while driving cart is to stay above 1.75VPC (Volts per Cell) or 42.0V for a 48V pack. Absolute minimum is 1.5VPC, or 36V for a 48V pack. Irreversible physical damage to the batteries may occur if taken below that voltage.

3. At-Rest: The battery or battery pack voltage after they have rested (neither charged nor discharged) for about 12 hours after being charged or about an hour after being discharged.

This is the voltage used to estimate SoC (State of Charge) from the SoC vs Voltage charts.

If you read the voltage too soon after charging, the SoC estimated will be artificially high and if it is read too soon after driving the cart, the SoC estimate will be artificially low.

Anything more than 8 hours after charging is usually close enough to get a reasonably accurate SoC and anything more than about 5-10 minutes after you stop driving cart will usually suffice.

[smokey tennis shoe]

AWESOME ! Thanks so much for your time.

You have helped me and others , beyond compare.

Thanks again