WSDMAVIS 1Pcs DC-DC Buck Boost Converter Regulator CC CV 0.5-30V 0-4A Adjustable Regulated Power Supply Module DIY Solar Battery Chargin Module LCD Display ZK-4KX

LCD displays input/output voltage, output current/output power/output capacity/output time. The module can be set to ON/OFF by default.
CNC adjustment enables accurate and fast adjusting. It can boost and lower voltage, with adjustable output voltage 0.5 -30V, and adjustable current limit 0-4A(can work stably at 3A for a long time, and can reach 4A under enhanced heat dissipation).
Anti-reverse connection protection of input end, so that it will not burn out when there is reverse connection. Anti-backflow protection at the output end. No need to add anti-backflow diode when charging. Multiple software protection mechanisms are available, and the protection threshold is adjustable. When the working parameters of the module exceed the protection threshold, the output will be automatically turned off.
Input under-voltage protection ( 4.8 -30V adjustable, default 4.8V ); Output over-voltage protection ( 0.5 -31V adjustable, default 31V); Output over-current protection (0- 4.1A adjustable, default 4.1A ); Over-power protection (0-50W adjustable, default 50W); Over-temperature protection (80-110 adjustable, default 110); Timeout protection (0-100h adjustable, OFF by default); Over-capacity protection (0-60Ah adjustable, OFF by default).
Output ripple is small andfilter is available. Thick heat sink.