The purpose of the EVBimmer battery interface boards is to protect the Orion Management System and the sensor wires of the Tesla modules in the event of a short circuit or improper wiring. An open circuit will be sensed by the Orion but a shorted lead will result in one or more blown fuses. Orion indicates that the maximum voltage between any two terminals should not exceed 5 volts.
DSC06336 image of the preliminary wiring diagram that connects the Orion to Tesla module number 1.
UPDATED 2/19/2019 and 3/6/2019
Preliminary testing has resulted in a design change. Previously used was the zener diode 1N4732A which is rated at 4.7 volts and it was found that on power up, transients can sometimes cause the diode to fail. The diode value has now been changed to a zener 1N4733A which is rated at 5.1 volts. The Orion uses an internal 5.6 volt zener, and our intention is to operate just below the Orion specification in an effort to further protect the Orion. We are also experimenting with the use of fast blow fuses to see if they can further protect both the Orion and the diodes.
Cell 6A of the EVBimmer J1 Terminal Block on Tesla Battery Module #1 is connected to Cell 0 of the EVBimmer J1 Terminal Block connected to Tesla Battery Module # 2.
DSC06337 image of the preliminary wiring diagram showing how each Tesla module is daisy chained.
NOTE: A testing board is now being made that will mimic a pair of Tesla battery modules. Using a series of resistors and the 12 volt supply ( required to operate the Orion ), it is possible to provide a chain of current limited low voltages that the Orion can sense and be monitored by the Orion software. With jumpers it will also be possible to short out individual "cells" of the testing board and the Orion software will be able to respond to each change observed.
Did you ever figure this out? I ended up using StealthEV cell taps, made this process much easier.
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