48V System Control

I am building a vehicle system having an I.C. engine powering a 48VDC generator, which charges a 48V battery, and also serves power to a 48V vehicle drive system. The engine/generator will be started when the voltage (battery-sensed) falls to 40 volts, stays on till voltage reaches 48V. Questions: During startup, as the generator spins up, its output voltage would be increasing, yet its output is connected to the battery. Is this an issue, should the generator then be isolated from the battery circuit until it achieves the required rpm? Anyone have a recommendation for a voltage sense/control device to bring the generator on/off?

before comments

Comments

No, for a number of reasons you dont have to worry about that start up period at all. The small amount of time where the voltage / current isnt upto max wont affect things, and regardless a battery wont backpower a generator.

Where u do need to adjust your calculations is the on/off voltages.
A 48v battery pack will have a fully charged value of around 55v and you would want the ICC to cut back in at around 50% of discharge which would still be around 48v. You may need to experiment a bit!

As for automatically turning a generator on, its not such an easy task. You could either build ur own circuit or Im a big fan of got this Lego Mindstorms Kit, Its a programable Lego brick that can take inputs from sensors and then decide to drive output motors. Personally Ive found NXT Mindstors useful for all sorts of automatic tasks. you would need the voltage sensor
www.techno-stuff.com/3wire.htm


Who's online

There are currently 0 users online.

Who's new

  • xovacharging
  • stuuno
  • marce002
  • Heiwarsot
  • headsupcorporation

Support V is for Voltage