Does the SL1 require a power source?
Yes, the SL1 must either be powered over the USB port (by connection to an on-site computer), or with a DC voltage source between 5 and 24V. A power supply, solar panel, or battery could be used to power the SL1. GreenMountain provides a cable terminated with the appropriate weatherproof connector and information on the connector (a standard off-the-shelf component available from Digikey and other vendors).