Variable DC Voltage Regulator Construction

Discussion in 'The Projects Forum' started by jtarleton, Sep 3, 2011.

  1. jtarleton

    Thread Starter New Member

    Sep 3, 2011
    I've got a solar panel who's output is ~ 19 volts and 2 amps. I'd like to run a radio or charge my cell phone. I've got an inverter which can't handle 19 volts. So I would like to hook up a voltage regulator between the panel and the inverter, which will supply the inverter with ~12v. So I need to drop the voltage to 12v. Does anyone have an easy fix for this problem?

    You might ask what's the point of the inverter, since the panel provides DC voltage. Problem is the cell phones chargers output is 5.1 vdc.

    Thank You
  2. Rent2Own

    New Member

    Sep 2, 2011
    Other, senior, members will probably advise you soon (probably with a more efficient solution). But it sounds like, as you've said, all you need is a voltage regulator? It will step the voltage down from 19v to 12v for you, also.

    This will probably need a heat sink, as is mentioned in the product/tech details, because it's dissipating the extra voltage. Again, this may not be the most efficient thing to do... why throw away free solar energy since that's probably your whole goal in the first place.
    Last edited: Sep 4, 2011
  3. iONic

    AAC Fanatic!

    Nov 16, 2007
    Take a look at this step-down voltage regulator. It will take your 19VDC and step it down to 3.3V or 5V DC. It's way more efficient than regulating to 12VDC then inverting to 120VAC, then converting to 5.1VDC to charge the phone.

    Pololu Step-Down Voltage Regulator D15V35F5S3
    Last edited: Sep 4, 2011
  4. wmodavis

    Distinguished Member

    Oct 23, 2010
    Regulate the solar panel output directly down to 5.1V.