The C35 and C60 are field configurable for 12 V and 24 V operation. The C40 may be configured for 12 V, 24 V, or 48  V operation. C35, C40 and C60 charge controllers can be used as a charge, diversion, or load  controller and come with a standard multi-color charge status LED face plate. Why choose C Series PWM?Higher return on investment •    Improve battery life with pulse width modulated (PWM) multi-stage temperature compensated charging •    Two-year standard warranty Flexible •    PV charge, diversion, load controller •    Available remote display with cumulative AMP hours Easy to service •    Electronic protection against short-circuit, overload, and over-temperature conditions •    Tolerance to hostile environments with conformal-coated boards and powder-coated enclosure Easy to install •    Field adjustable voltage and battery set point •    Automatically disconnects from the battery at night •    Compatible with negative ground and ungrounded systems