On most L&L Kilns this is very easy to do. It is a matter of re-distributing the wires between the kiln fuses or relays and the main powerblock inside the control box.
All the elements will need to be replaced. For example, the ohms on the J230 208 volt element circuits should be around 14.2.
It is possible to convert a J230 manual kiln into a JD230 automatic kiln.
The only way to figure this out accurately is to have a kilowatt meter installed in the power supply line.