DC 27V power supply Stabilizers input 12V24V(9V-36V) output 27V Regulators battery automatic buck boost Constant voltage output - AliExpress
ΤΡΟΦΟΔΟΤΙΚΟ ΑΝΟΙΧΤΟΥ ΤΥΠΟΥ 100W/27V/3.8A PCB LPS100-27 MEAN WELL
New PWM 159*97*38mm (L*W*H) High Voltage Battery Charger 27V Switch Switching Power Supply 12V with UL - China Switching Power Supply 12V 3A, Switching Power Supply Cable | Made-in-China.com