PR Express Accessory Panel 30W 19-36VDC to 12VDC converter SunWize PR Express Accessory Panel 230074 is a prewired aluminum control panel for our Power Ready Express systems. The converter control panel features a Mean Well DC:DC converter that plugs directly into a PRE Control Panel’s output terminals. Have you seen our complete Power Ready Express Systems? Designed to save you money and installation time, these systems solve common power problems.