"Shunt The Fangpusun PA HS200 is a highly intelligent currentsensor with extremely low own consumption. The Fangpusun PA HS200comes into play when (e.g.) an inverter is directly connected tothe battery and the Fangpusun Tarcom or Power Tarcom chargecontroller cannot measure the current consumption. A shunt is alsorequired when an additional generator (e.g. PV, wind ordiesel)directly charges the battery without being connected to a FangpusunTarcom charge controller. The current is measured contact-free viaa Hall-effect sensor. The data is transmitted to the chargecontroller over a cable connection. Up to two Fangpusun PA HS200shunts can be connected and the measured current can be selectivelyadded to the charging current, battery current or load current asdesired. " http://www.fangpusun.com/
Solar Charge Controller Accessories Shunt