Device for monitoring operability of photovoltaic system has voltage indicator connected to each string of solar cells, and device that prevents reverse current flow back from load to voltage indicator

摘要

The photovoltaic system has a module with several strings (2-4) of solar cells connected in series whose output is connected to the input of a voltage indicator (14) and to the load (13) via a device (19,20) that prevents reverse current flowing back from the load to the voltage indicator. The reverse current blocking device has at least one blocking diode so the voltage indicator only receives the solar current of the respective string.