USB WattsVIEW DC Power Monitor with Data Logging & reporting Windows / MAC 105Amps, 200V DC USB Power Monitoring Outputs Data to your PC or MAC Computer Up to 200 Volts DC and -75 to 105 Amps range - Max Power 21,000 Watts Open Source - PIC Micro Controller Architecture 8 bits digital IO respond to software commands to control solid state relays or other devices Free Labview open source code / drivers - labview compatible.