Solar Panel Monitoring

http://www.dx.com/p/gy-471-3a-range-max471-current-module-detection-sensor-purple-449087#.WoAxFHXOX0o

I found the following pinout:

Pinout 
SensorRS+.........Load positive supply (3 to 36V)RS-..........Connect to load or charger
Interface:RS+.........Alternative load positive supply (3 to 36V)GND.........Connect to loads 0V/GND supplyOUT..........Current sensor output (1V / Amp, 3V max)SIGN........Current flow direction. An open-collector logic output (low = current flow from RS+ to RS-).GND.........Alternative GND (Connect to loads 0V/GND supply)RS-...........Alternative load/charger connection.

From : http://hobbycomponents.com/sensors/900-max471-gy-471-3a-current-sensor-module