The Expion360 85A MPPT Bluetooth-Programmable Solar Charge Controller is the latest technology in solar charge controllers with maximum power point tracking (MPPT) and Bluetooth functionality. With its high amperage rating, it's perfect for larger solar installations in RVs, overland vehicles, marine vessels, and off-grid homes. An MPPT controller is like a sophisticated DC-to-DC charger that can take the maximum voltage and current from the solar panels and provide the maximum output needed by the battery bank. It can identify the location on the solar panels with the best sun exposure at the highest available voltage and current and make continual adjustments as sun conditions change. This MPPT solar charge controller can be 30% more efficient than simpler pulse width modulated (PWM) solar charge controllers, and the E360 solar charge controllers have a large aluminum heat sink for efficient cooling and improved performance. The Bluetooth programmability allows the charge profile to be custom set for any battery chemistry, making it an exceptional choice when paired with E360 lithium batteries. Get the most out of your solar power system with the E360 85A MPPT Bluetooth Programmable Solar Charge Controller.• Up to 4, 400W solar input (48 V)• Over 30% greater charging efficiency than PWM• Remote LCD screen• Oversized heat-sink• BluetoothSpecificationsBattery Type: LiFePO4, Lead Acid (sealed/gel/flooded)Rated Charging Current: 0-85A (adjustable)Max Input: 1, 100W (12V), 2, 200W (24V), 4, 400W (48V)Ingress Protection: IP32Dimensions: 12.4" x 9" x 4.8"Weight: 12.5 lbs. Large heat sink for efficient cooling & improved performance Bluetooth programmability allows charge profile to be custom set Remote LCD screen | Expion360 MPPT 85A Solar Charge Controller with Bluetooth