This is for a lightly used Carnetix 2140 power regulator. I bought this to go with my laptop carpc that I had before changing to a MOCOSO computer to replace it. I never got this working quite right and therefore it hasn’t been used very much. $80

Here is the description:
http://www.carnetix.com/P2140/CNXP2140.htm
Features
• Dual Output Regulator for automotive, RV, truck, taxi, and marine applications
• Total output power up to 250 Watts (24Vin/20Vout) or 185 Watts (12Vin/20Vout)
• Compatible with 12V OR 24V systems (auto ranging, no jumper changing)!
• Jumper selectable main output of +12V/+18.5V/+20V
• Primary output capable of up to 11 amps at +12V (130 watts) or 7.5 amps @ 20V (150 watts)
• Jumper selectable secondary output of +12V/+13.5V or +5V at up to 3 amps (36 or 15 watts)
• Optional 3rd output using CNX-P5V/15 watt regulator
• Includes sturdy aluminum chassis and variable speed fan.
• Survives Engine Cranking under full load over entire temperature range
• Includes sophisticated Startup/Shutdown Controller (SSC) with USB interface to your CarComputer
• INCLUDES PSUmoni(tm) POWER SUPPLY MONITOR APPLICATION PROGRAM!
• Firmware upgrdable using USB port. No PIC programmer required!
• Low battery monitor (user settable threshold) prevents drained battery, even during Standy/Sleep
• "Anti Thump" delayed remote control (DLYON) for audio amplifiers (user settable delay time)
• "Deadman Timer" to cut power if your system remains in sleep/standby for too long (user settable time)
• Remote "Pulse Start" from wireless device or car alarm/remote start system
• Over current protection on both outputs with graceful forced shutdown of main output
• Powers both your computer (PC or Mac) AND your screen or USB devices
• Compatible with Mac mini including startup/sleep mode
• Compatible with Aopen Pandora Mini PC
• Compatible with +12V or +19V Pentium-based systems such as Travla, Sumicom, Xenarc SC3 & SC8, Commell, Cappuccino, EZgo, and many others.
• Full, safe support for Windows Standby mode including auto shutdown if PC fails to shutdown
• Over voltage surge suppression on battery input for protection of harsh automotive environment
• User replaceable fuse on battery input to protect your car from internal short circuits
• Very compact design measuring 4.6" x 3.25" x 1.75" (L x W x H) or 117mm x 83mm x 45mm.