Shunt 1000 Amp 50 mV - 1000A/50mV
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The ARCO ST1000 is a 1,000 amp, 50 millivolt current shunt. It is the sensor that lets a regulator or battery monitor measure exactly how much current is flowing. All of the battery’s negative current passes through it, and the tiny voltage drop across it (50 mV at the full 1,000 A) tells the meter the current.
It is sold as an accessory for the ARCO Zeus alternator regulator, which can read two shunts at once: one on the battery and one on the alternator. With a shunt fitted, the Zeus sees real charge current instead of estimating it, which is how it tapers charging accurately and tracks battery state. In the regulator’s settings you enter the shunt’s rating: 1,000 A and 50 mV.
| Rated current | 1,000 A |
|---|---|
| Output at rated current | 50 mV |
| Made for | ARCO Zeus regulator (battery and/or alternator shunt) |
Pick a shunt rated above the largest current that will ever pass through it: the biggest inverter load plus everything else, or the alternator’s peak output. If that can exceed 500 A, use the 1,000 A version. Otherwise the smaller shunt resolves low currents more finely. The other size: ARCO ST500.
New to shunts? What does a shunt do? explains where it goes and why it matters. Questions about your system? Call (410) 216-2907.
