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  100Amp $20    500amp $27.38       
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.          Source = Bogart Engineering