Reply To: Using cigarette lighter socket 300 inverter to charge my Green Power Fastest. April 30, 2025 at 5:46 pm #304968 kezoParticipantWhat fuse rating is the 12V socket. If unsure look in manual.10A fuse 120w inverter (10 x 12 =120)15A fuse 180w inverter (15 x12 =180)20A fuse 240w inverter (15 x 12 =240)30A fuse 360w inverter (30 x 12 =360)