A monitoring device configured to monitor information associated with the functioning of a solar panel (12-1, 12-2, 12-3,..., 12-n) having electrical connections, the monitoring device (28-1, 28-2, 28-3,..., 28-n) comprising - connection poles (23a, 24a) connectable to respective electrical connections of said solar panel; - reading means (34, 35, 36, 36bis, 36ter) adapted to read the information associated with the functioning of the panel (12-1, 12-2, 12-3,..., 12-n), said information being selected at least from a group comprising: - voltage of the panel; - current of the panel; - temperature of the panel; - pressure; - illuminance; - a transmitter circuit configured to transmit said information through said connection poles (23a, 24a) to a coordinator circuit connected, in use, to said connection poles by means of said electrical connections; - a micro-processor circuit connected to the transmitter circuit and configured to activate the transmitter circuit to transmit said information to said coordinator circuit; - an identification circuit connected to the micro-processor circuit and configured to represent a certain identification number of said monitoring device (28-1, 28-2, 28-3,..., 28-n); characterised in that - said micro-processor circuit is configured to activate said transmitter circuit, in reply to the acknowledgment of a synchronization signal, with a delay time determined as a function of the identification number; and in that - said transmitter circuit is configured to transmit said information by short-circuiting each other, in use, said connection poles (23a, 24a) and said respective electrical connections of said solar panel, so as to set at zero its voltage. - connection poles (23a, 24a) connectable to respective electrical connections of said solar panel; - reading means (34, 35, 36, 36bis, 36ter) adapted to read the information associated with the functioning of the panel (12-1, 12-2, 12-3,..., 12-n), said information being selected at least from a group comprising: - voltage of the panel; - current of the panel; - temperature of the panel; - pressure; - illuminance; - voltage of the panel; - current of the panel; - temperature of the panel; - pressure; - illuminance; - a transmitter circuit configured to transmit said information through said connection poles (23a, 24a) to a coordinator circuit connected, in use, to said connection poles by means of said electrical connections; - a micro-processor circuit connected to the transmitter circuit and configured to activate the transmitter circuit to transmit said information to said coordinator circuit; - an identification circuit connected to the micro-processor circuit and configured to represent a certain identification number of said monitoring device (28-1, 28-2, 28-3,..., 28-n); - said micro-processor circuit is configured to activate said transmitter circuit, in reply to the acknowledgment of a synchronization signal, with a delay time determined as a function of the identification number; and in that - said transmitter circuit is configured to transmit said information by short-circuiting each other, in use, said connection poles (23a, 24a) and said respective electrical connections of said solar panel, so as to set at zero its voltage.