Maximize your solar power system with these high-efficiency MPPT charge controllers. You get TWO controllers in this pack, each capable of handling up to 4000W of solar input and outputting 100A of current. They automatically detect and work with 12V, 24V, 36V, or 48V battery banks. The MPPT (Maximum Power Point Tracking) technology squeezes every last watt from your solar panels, especially in less-than-ideal light conditions. They feature a clear LCD display for monitoring voltage, current, and status, and are built to be corrosion-resistant, dust-resistant, and waterproof for indoor/outdoor installation. Made in the USA from plastic and aluminum. Unbranded/Generic but packed with features. Perfect for large off-grid homes, cabins, RVs, or backup power systems. Hook up your panels and batteries with confidence, knowing your system is charging efficiently and safely.