Well I just purchased a power supply Cosel P600 12 volt adjustable 53 amp for $42.00 total on eBay from an electronics engineer. I have Googled this name to find out more and they go for $575.00 to $775.00 new and have been told they were designed for robot use in at least some applications. The owner has set it up for me to easily use it for powering my KL-503 and any 12 volt mobile applications I might need. Has anyone heard of this supply and has or currently using one?