Regulator Voltage 24V to 13.8V 10A 20A 30A 40A Transformer Stabilizer dc dc step-down module DC DC Converter Step Down Buck Wide input voltage from 18 to 35V Stable output voltage is 13.8V 100% full rated power 100% full stable output current 100% burn-in test High-efficiency up to 95% Waterproof sealed Cooling by free air convection Surface mountable 2 years warranty Over-current, over-voltage protections Over-temperature, shutdown, short-circuit According to: EN 50498:2010 IP68 FOUR TERMINAL WIRING: Input + to Battery +, Input- to Battery-. Output + to Load +, Output- to Load -. Notes: Please connect the polarity correctly, or the converter will be burnt. This DC/DC Converter can't work as solar controller or wind controller. Other Policies 1. We are not responsible for any custom duty or import tax. 2. All emails will be answered within 24 hours. If you don' t receive our reply, please kindly re-sent your email and we will reply to you asap. Packaging and Shipping 1.Product will be shipped within 1-2 business day after full payment is received and verified. 2. The transportation time is uncontrollable. Please wait patiently and continue to pay attention to the package dynamics. If you have any questions, please contact me immediately. Feedback 1.We rely on our reputation and customer satisfaction to succeed. Therefore,your feedback is extremely important to us. Please leave good feedback to us if you are satisfied with our goods and service. 2. If you are unsatisfied with any aspect of our service,please send me a message us before leaving any negative feedback or opening anydispute on the site. We will help you solve the problem.