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The new and improved Commander 40A MPPT charge controller will take your solar system to the next level. Unlike a basic PWM Controller, this charge controller is compatible with sealed lead-acid, flooded, and gel batteries (all deep cycle). This controller keeps the batteries from becoming over-charged or discharged, increasing the longevity of your batteries. This high tech controller features Multiphase Synchronous Rectification and Maximum Power Point Tracking technologies, which increases charging efficiency and improves system performance. And with the included MT-50 Tracer Meter you will have full control over your controller. This controller and tracer meter combo will allow your system to run more efficiently then ever! Specifications Nominal System Voltage: 12V/24V Auto recognition Rated Battery Current: 40A Max. Solar Input Voltage: 150VDC Maximum Battery Voltage: 32V Communication: RSJ45 Dimensions: 11.90 x 7.19 x 2.50 inches Max. Terminal: 25mm2, 4 AWG Max. Solar Input Power: 520W (12V), 1040W (24V) Rated Load Current: 20A Self-consumption: ≤30mA (24V) Temp. Compensation: -5mV/°C/2V (default) Weight: 6.39 Lbs Mounting Oval: 0.30 x 0.18 inches Max. PV Input Short Current: 50A