I spent about 30 minutes while watching television graphing my two test runs with pencil and paper, then added color with MS Paint. I think it is a nice summary. As I have said, I am not expert, so I do this stuff as a hobby, trying to learn as I go.
I did not know what to expect before I plotted the coordinates. I was quite surprised to see the pack discharging in a linear way. I found it very interesting to see that each coordinate came very close to the line. The two that are furthest from the lines were at my Dad’s house with his voltmeter. I suspect our volt meters vary by a bit, but we have yet to have them at the same place to verify.
- The solid lines of the graph represent my actual ride, the dashed sections are a projection of how far we may go if the discharge continues in a linear fashion.
- The green line at 48.41 volts is a deeply as like my packs to discharge. Looking at the graph, this pack could go between 45 to 49 miles under these conditions documented in post #1.
- The red line at 46.63 volts is as deep as any manufacturer says to ever discharge a pack. Going beyond this line is simply not good for the pack and could lead to permenant damage. My projected run out would be between 75 – 79 miles. I say projected as I will not take my pack there. If someone wants to know, let me borrow your cart and I will see if the discharge line remains linear
. I know for my test it does remain linear out to 63 miles.
- I do not understand why the two lines vary by 2/10s of a volt. The rides were very similar with respect to wind and temp. Maybe driving speed based on traffic? Do not know....
Like I say, doing this stuff is not required to own an electric cart, but it is interesting to me and learned a couple of things I never knew:
- Battery packs discharge linearly
- Being in a golf cart for 63 miles is boring and a bit of a pain in the
PS. I know the 20% SOC in the picture should be 46.63 and I have no intention of fixing
