The SP10R-PW is a 10 W photovoltaic power source capable of recharging batteries. Its 6.1 m (20 ft) cable terminates in a connector that attaches to a Campbell Scientific prewired enclosure. The SP10R-PW is similar to the SP10-PW except it contains an on-board voltage regulator, allowing the SP10R-PW to supply power to a user-supplied battery mounted inside a Campbell Scientific prewired enclosure (PWENC).