Monday, August 29, 2011

BugE Q & A

This blog posting is a partial response to some questions fermi_of_borg had in his BugE build.

The first photo shows how I oriented my direction switch. I found it was easiest if I had the forward direction pointing backward. However, this is probably opposite of what people normally would think when it comes to direction. I had to remove quite a bit of material with a Dremil tool to get a sufficient sized notch for the switch to go into. I decided to go with a notch instead of a hole since I open and close the battery compartment quite often for small adjustments. Now, no need to remove the handle!

The second photo shows the switch orientation without the cover. The direction switch is held in place with a couple of "L" brackets attached to a platform I made from a cutting board I bought at Wal-Mart. It's cheap, easy to cut, non conductive and needs no painting. Anyway, In the lower left is a little photo of a wiring change I did. In the original 48V wire diagram two wires were to be attached to a contactor terminal. Problem is, it's quite a tight space. So, I decided to attach the two wires together instead at the top terminal of the reversing switch. Electrons don't care which end of a wire they are on. To them, one terminal of a wire is identical to the other terminal of the same wire.

When it comes to connecting the lug rings, the type of nuts should connect very TIGHT! Using Nylock nuts will help. Also, double check the little screws on the lithium battery pack. They should be tight too. One way I happened to find a couple of a loose screws that I had forgotten to fully tighten was when my BMS said it had a "volt diff" error when I accelerated. Inspecting the pack, then tightening the loose terminal screws got rid of that error.

Last is a photo of my BMS wiring harness which is an example of perfection being given up for progress. It's ugly, but it works. Making a better harness will be a winter project. Meanwhile, this mess seems to work for me right now.

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