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I've just bought a battery monitor BMV 700. The wiring diagram shows that the shunt should be connected between the battery negative and system ground. I wonder why this is.
The only reason I could imagine is when using a wrench to tighten the bolts the tool can easily hit the surrounding metal housing and this will cause no harm.
Any ideas?
TIA,
Hugo
It is in the negative side so the the Voltage drop measured over the shunt will be a positive value with respect to the negative of the battery.
The Analogue to Digital converters (like what's in the BMV unit) need to measure a positive Voltage with respect to it's digital ground which is referenced to battery negative.
