Mean Well SP-320-13.5 Power Supply, Single output, 13.5 V, 22 Amp, 297 W, 8.5" L x 4.5" W x 2.0" H, Silver, 4.5" width, 8.5" Length. Product type - ac to dc power supply. Efficiency ( percent ) - 86. Type - auto switching. Mean Well SP-320-13.5 Power Supply, Single output, 13.5 V, 22 Amp, 297 W, 8.5" L x 4.5" W x 2.0" H, Silver, 4.5" width, 8.5" Length. Unit Count : Power Supply.