Xantrex C-Series Solar Charge Controller - 40 Amps

The Xantrex C-Series Solar Charge Controller - 40 Amps (model C40) is a field-configurable power management system engineered for mobile and stationary power applications requiring reliable photovoltaic energy harvesting. Built for off-grid vehicle builds, RVs, campers, and remote equipment installations, this charge controller bridges solar panels and battery banks with intelligent load management. Whether you're outfitting an expedition vehicle with auxiliary power or managing a standalone solar array, the C40 delivers the precision control and multi-voltage flexibility that professional installers and DIY enthusiasts demand for mission-critical energy systems.

The C40 operates across three voltage configurations—12V, 24V, or 48V—allowing a single unit to adapt to your specific electrical architecture without requiring different hardware. Its 40-amp charge capacity combined with integrated diversion and load control means the controller actively regulates incoming solar current, prevents battery overcharge, and can manage auxiliary loads simultaneously. The field-configurable design eliminates guesswork during installation; you set the voltage platform once during commissioning, and the controller's intelligent PWM (pulse-width modulation) algorithm optimizes charging efficiency regardless of sunlight intensity or battery state. This compact form factor (7 x 3 x 13 inches, 3.5 lbs) mounts cleanly in engine bays, battery boxes, or electrical compartments typical of vehicle and equipment retrofits.

Mechanics and system integrators specify the C40 for dual-battery setups in trucks and vans where auxiliary lithium or AGM banks demand precise charge regulation and load balancing. The 40-amp throughput suits solar arrays in the 400–600W range, making it ideal for vehicles carrying moderate auxiliary loads—winches, air compressors, inverters, and refrigeration systems. Installation is straightforward for anyone with basic electrical knowledge: wire the PV array input, battery terminals, and any load circuits directly to the controller's terminals, then configure the voltage setting via field-accessible switches. Its reputation for rugged performance in temperature extremes and high-vibration environments makes the C40 a trusted choice for overlanding rigs, emergency response vehicles, and remote site power systems where downtime is not an option.