For sale is one 12v to 24v DC to DC Step up converter.  This module is rated at 10A output (240w @ 24vdc) and has a 5" long wiring harness.  These converters have a very decent conversion efficiency of approximately 90%.  Unit is weather sealed, and in a die cast aluminum heat sink case.

Input Voltage: 12vdc
Output Voltage: 24vdc
Output Current: 10A (240w @ 24vdc)
Conversion Efficiency: ~90%
Dimensions: 3"x3"x1.25" (LxWxH)

If you have any questions, please don't hesitate to contact us!