The BM39 is a battery monitor designed specifically for monitoring small 12V or 24V battery systems.

It comes with a 300A shunt mounted on an electronic board complete with connectors to simplify wiring and allow installation even by less experienced technicians.

The charge status is calculated and displayed by measuring the energy being charged and discharged from the battery.

The display can work with all battery types and, when combined with ERA charge controllers, can display the operating status of the photovoltaic field.