Pack voltage going up a steep hill

[patgrim00]

Johnnie can you tell me what my run time should be I have Trojan 605 and under full throttle take off my pack voltage drops to 33.5v

[JohnnieB]

Originally Posted by patgrim00

Johnnie can you tell me what my run time should be I have Trojan 605 and under full throttle take off my pack voltage drops to 33.5v

Run-time and range are different animals and what Sir Nuke and I were calculating was range.

Run-time (aka Load testing) is determining a battery's storage capacity by discharging it a constant Amp rate and measuring how long it takes for the voltage to drop to 1.75VPC. When properly broken in, a new T-605 has a storage capacity of 210AH and when discharged at a constant 75A rate, it takes about 105 minutes to discharge it down to 5.25V (1075VPC) and in normal use, cart batteries are not typically discharged lower than 50% SoC, so the useable run time would be half of that or about 53 minutes. (As the batteries age, their storage capacity diminishes and the Run time decreases.)

Range is how far a specific cart will travel on the energy stored in the battery pack and depends on the efficiency of the cart as well as the storage capacity of the batteries. To estimate maximum range for a specific cart and battery pack, you need the battery's storage capacity (AH Rating), a starting SoC, an ending SoC and the distance traveled between the two.

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All the fact that your pack voltage drops to 33.5V (1.86VPC) under full throttle take off tells me is that the batteries are sufficient for full throttle take offs. What does the pack voltage drop to on a sustained uphill climb?

[patgrim00]

I only have one hill in my nieborhood and the pack voltage drops to around 32.5 when climbing it I don't think that is too bad considering the aggressive tread pattern and 25" tires that is full throttle going up the hill. Can you tell me about how far I should be able to drive based on the information given ?

[JohnnieB]

Originally Posted by patgrim00

I only have one hill in my nieborhood and the pack voltage drops to around 32.5 when climbing it I don't think that is too bad considering the aggressive tread pattern and 25" tires that is full throttle going up the hill. Can you tell me about how far I should be able to drive based on the information given ?

No.

Start with a fully charged battery pack.
Measure distance traveled with typical load (Passengers and cargo) over typical terrain to the nearest 1/10 mile. At least 5 miles.
Wait 15 minutes after stopping and measure pack voltage to at least 0.1V. (IE: 37.2V)

It is basically the same as figuring out how far a car will go on a tank of gas.

[patgrim00]

Ok thanks for the info johnnies just wondering I haven't driven it over about 5 miles since the controller and tire change