Check the listing for details. MPPT Boost Solar Controller 300W Car Battery Charging Voltage Regulator. Condition: New. Listed at 147.39 USD. 3. Ultra-fast maximum power point tracking speed, while ensuring tracking efficiency.4. The 4-digit digital tube of this machine has the functions of real-time display of battery board voltage, charging current, battery voltage, etc., which is convenient and clear to display the charging status. And this product allows customers to freely set the battery voltage and charging parameters.5. The operating voltage range of the maximum power point of the wide photovoltaic array is 12V-50V. 8. This product supports customers to manually arbitrarily set the battery voltage and charging parameters through the button, and is applicable to various battery types, such as lithium batteries, iron-lithium batteries, nickel-metal hydride batteries, lead-acid batteries, gel batteries and other various typ.