1、MPPT CHARGING: Advanced MPPT maximum power point tracking technology, with a maximum tracking efficiency of 98%, the battery controller can save battery panel energy. 2、PREMIUM CONVERSION EFFICIENCY: Adopting premium components to improve system performance, with a maximum conversion efficiency of 97%. Ultra fast maximum power point tracking speed while ensuring tracking efficiency. Equipped with a child lock function to prevent charging errors caused by accidentally touching buttons. 3、MULTI FUNCTIONAL: This 4 bit digital tube has real time display functions such as battery board voltage, charging current, and battery voltage, making it easy to clearly display the charging status. And this product allows customers to freely set battery voltage and charging parameters. 4、LOW ENERGY CONSUMPTION: Solar panel charging technology, with standby power consumption of 0, all system power consumption comes from the battery panel and does not work at night. The maximum power point operating voltage range of a wider photovoltaic array is 12V‑50V. 5、WIDE COMPATIBILITY: This solar boost controller is suitable for various batteries, including lithium batteries, iron lithium batteries, acid batteries, etc. Customers can set various battery charging parameters through the SET button, suitable for various battery types, with high charging efficiency, and can display real time battery panel voltage, charging current, and battery voltage. 1 x Controller 2 x Fuse 1 x Manual  Item Type: Solar Boost ControllerMaterial: Aluminum AlloyBattery Type: 24V, 36V, 48V, 60V, 72V self identification (default 48V)Overvoltage: 28.8V (24V), 43.2V (36V), 57.6V (48V), 72.0V (60V), 86.4V (72V), can be set independentlyPV Maximum Power: 400W at 18VPV Maximum Current: 22AReverse Connection Protection: Reverse connection of the battery will blow the fuseMPPT Efficiency: Greater than 99%Overall Efficiency: Greater than 97%No Load Loss: Less than 20mAWorking Temperature: -20 ℃ to 65 ℃Insulation Resistance: AC1KV, 5min test, greater than or equal to 20M ΩWaterproof Grade: IP65