500A/50MV & 1000A/100MV SHUNTS
- Resistance: "500 Amp at 50 millivolts", or 0.1 milliohm.
- Max. steady state current, amps: 410 Amperes
- Thermal time constant: 18 minutes
- Overload current: If normally operated at less than 300 amps,
- it will take overloads to 500 amps for durations of less than 5 minutes.
- Physical characteristics: Has a plastic base 3.25 x 1.75 in. with two mounting holes .
- 205 "dia, 1.25" apart o.c. 1.75 inches overall height.
- High current connections are made to two bolts (3/8"-16) which are 1.50 in. apart (o.c).
How a shunt works
A shunt is necessary in order to measure amps and amp-hours with the TriMetric battery monitor.
A shunt is an accurate, very low resistance resistor which is placed "in line" with the wire carrying the current to be measured.
With the TriMetric, it is usually placed in the negative wire from the battery bank, such that all the
current going into the battery (charging) or out (discharging) must pass through it.
Connected in this way it will be set up to monitor "net" amp-hours in and out of the battery.
(It also could be placed in series with the negative wire coming from a solar array–or other charging source–in which
case it would measure only the solar array current, if that were desired–to show total solar "amp hours" production.)
The shunt needs to be placed near the batteries; since these wires carry very high currents
the wires from the batteries must be kept short to minimize electrical losses.