What is a shunt? A shunt is a very small, accurately-known, low resistance resistor used to measure current. Meters & Battery Monitors use shunts to measure amps and amp-hours. The shunt is placed in series with the load so that it can measure the current flowing through it. Because the resistance is known, the current be calculated based on measuring the voltage drop across the shunt.
For loads less than 70 amps, use the 100A, 100mV DC Shunt for Curent Monitoring Meters. The 500A, 50mV DC Shunt for Current Monitoring Meters is recommended for loads up to 400 amps. For larger loads that will not exceed 900 amps, use the Midnite Solar 1000A, 50mV Shunt.