CoilSaver is a PWM solenoid driver for a wide variety of valves used in High Power and amature rocketry. $54.95
coilsaver

Ratings
Input: 9 to 18 VDC Output: 12 amps peek, 2 amps continuous

Features
  • Opto-isolated input.
  • High surge current to open large valves.
  • 17mA standby current
  • Extends battery life by reducing the hold current
  • Most valves will hold on a 2% duty-cycle
  • 10kHz PWM produces little or no heat in the solenoid or the CoilSaver
  • Valves may be kept on continuously without overheating
  • Allows the use of a much smaller easier to carry battery

The
firmware listing and schematic are provided so you can customize.