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12VDC Solar to 1.2VDC Regulator?

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    12VDC Solar to 1.2VDC Regulator?

    I have a requirement to connect a 12VDC Solar-panel to a 1.5VDC device. Since the 12-volts may fluctuate, I need some sort of regulator? If so, what type?

    #2
    What is the current requirement at 1.5V?
    What is the tolerance on the 1.5V?
    edit to add: What is the tolerance on the 12V?
    Does the 1.5V require isolation from the 12V?
    Can you build your own circuit board and mount in a box?
    Or, are you required to buy a commercial product?

    Is lack of listing going to be an issue?

    If the current is small, tolerance is <.1V, no isolation required, you can build you own, and lack of listing is not an issue, the solution is four parts if you count the heatsink, <$20.
    If you have to buy a commercial product, isolation required, <.05V tolerance, probably still no listing, maybe a recognized component, you are in the $X00 range.
    Last edited by iceworm; 08-23-19, 09:35 PM. Reason: Clarify specs
    Without data you’re just another person with an opinion – Edwards Deming

    Comment


      #3
      Originally posted by iceworm View Post
      What is the current requirement at 1.5V?
      What is the tolerance on the 1.5V?
      edit to add: What is the tolerance on the 12V?
      Does the 1.5V require isolation from the 12V?
      Can you build your own circuit board and mount in a box?
      Or, are you required to buy a commercial product?

      Is lack of listing going to be an issue?

      If the current is small, tolerance is <.1V, no isolation required, you can build you own, and lack of listing is not an issue, the solution is four parts if you count the heatsink, <$20.
      If you have to buy a commercial product, isolation required, <.05V tolerance, probably still no listing, maybe a recognized component, you are in the $X00 range.
      Agree more details needed. If low current required, a simply IC linear voltage regulator for 5 bucks (plus a heatsink) would do it.

      A "12 volt" solar panel will typically be ~17 V open circuit.

      Try googling something like "dc-dc buck converter" or maybe "adjustable dc-dc converter" to find a plug and play unit.
      Ethan Brush - East West Electric. NY, WA. MA

      "You can't generalize"

      Comment


        #4
        Also, what is the requirement on ripple or noise on the 1.5V output. For example, if it's for lighting it would be relatively tolerant to noise. But an audio application would not be.

        Comment


          #5
          now that we have thoroughly intimidated you with specs, just make some guesses.

          What you are asking for is not real common. I have not heard of anything COTS. Here is a possible solution.

          vicor regulator evaluation board from mouser
          https://www.mouser.com/Search/Refine?Keyword=pi3421 ~$60

          I have always liked vicor - they make pretty good stuff.

          This particular chip is not isolated.
          If you need isolated, vicor makes an isolated dc-dc converter to feed the regulator. You will have to make your own board. Shouldn't be to tough, 2 pins in - 2 pins out. ~$200

          For commercial systems, a problem will be replacement parts. You will have to document really well.
          Without data you’re just another person with an opinion – Edwards Deming

          Comment


            #6
            Thanks... The examples you were very helpful! Forgot to mention, need waterproof too. So I am looking at this: https://www./itm/Waterproof-Adjustab...53.m1438.l9372 I read the work "regulated". If the input fluctuates, will the output remain steady?

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              #7
              It looks like you are trying to link https://www.amazon.com/DROK-90010-Wa.../dp/B00C0KL1OM

              That is the basic concept for what you want. A 'voltage regulator' is a device that somehow adjusts its operation to maintain a somewhat constant output voltage while its input voltage (and output current) fluctuates.

              With that said, the devil is in the details of the actual operation, and thus the specifications that you were asked for. The details that you don't even know to ask about are the reason that this is not a DIY forum, however for 12V to 1.5V I don't think anyone will fuss. This particular device might be perfect, or might be wrong 6 different ways from Sunday. This particular device is almost certainly not UL listed, is made for relatively high current, and consumes a significant amount of power to function.

              -Jon

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                #8
                CC you did great. - way better than anything I found
                just go to their website and check the specs. See if it matches what you need
                Without data you’re just another person with an opinion – Edwards Deming

                Comment


                  #9
                  I like a challenge(no matter the size), then a solution


                  With all the helpful input... Here is what I came up with. Thoughts?
                  Attached Files

                  Comment


                    #10
                    190825-1037 EDT

                    CCinPA:

                    Probably not a good idea. Think about it. It will work, or sort of, but that is not what you need to think about.

                    .

                    Comment


                      #11
                      Originally posted by gar View Post
                      190825-1037 EDT

                      CCinPA:

                      Probably not a good idea. Think about it. It will work, or sort of, but that is not what you need to think about.

                      .
                      What should I think about?

                      Comment


                        #12
                        I don't know what Gar has in mind, however try these for starters:[LIST][*]24V solar cell charging a 12V battery. Do you need some kind of a charge controller, so the battery doesn't boil out?[*]Conversion efficiencies. The solar panel is 1.5W, the ornament is 1W. If the solar pumps 1.5Watt-hours into the battery, you get less than 1.5WH out of the battery. I don't know what the efficiency of the 12V - 1.5V converter. However, I'm pretty sure that 1 watt in will give you less than 1 watt out. How many hours of load operation per day are you planning? Do you have enough power to keep the battery charged?[*]What do you have in mind for a battery voltage cutoff? Letting SLA batteries go completely flat tends to degade the battery.[/LIST]
                        You might look through Instructables. They have a lot of stuff. Something might be similar.

                        Just some random thoughts
                        Without data you’re just another person with an opinion – Edwards Deming

                        Comment


                          #13
                          Originally posted by iceworm View Post
                          I don't know what Gar has in mind, however try these for starters:[LIST][*]24V solar cell charging a 12V battery. Do you need some kind of a charge controller, so the battery doesn't boil out?[*]Conversion efficiencies. The solar panel is 1.5W, the ornament is 1W. If the solar pumps 1.5Watt-hours into the battery, you get less than 1.5WH out of the battery. I don't know what the efficiency of the 12V - 1.5V converter. However, I'm pretty sure that 1 watt in will give you less than 1 watt out. How many hours of load operation per day are you planning? Do you have enough power to keep the battery charged?[*]What do you have in mind for a battery voltage cutoff? Letting SLA batteries go completely flat tends to degade the battery.[/LIST]
                          You might look through Instructables. They have a lot of stuff. Something might be similar.

                          Just some random thoughts
                          As I ponder all this great information... Is it really true that a24v into a 12v will "boil" the 12v? Then taking this one-step-at-a-time... Would replacing the 12v rechargeable with a 24v rechargeable be a step in the right direction?

                          Comment


                            #14
                            Don't know.
                            Batteries generally require a charge controller.
                            Unless the power source id not sufficient to charge the battery. Which might be your case. If you are charging all day,running all night, the energy budget looks pretty close.

                            You really need to do some of the research
                            For example, did you ever get a copy of the converter specs?
                            Without data you’re just another person with an opinion – Edwards Deming

                            Comment


                              #15
                              190826-0643 EDT

                              CCinPA:

                              From your first post, a 1.5 V device.

                              What is the device? How far from the 1.5 V power source to the 1.5 V device? Is there just one and only one device at one location? If many devices, then how are they distributed in space? How much peak current does the device require, and all devices? What is the average steady state current to the device, or devices? Why such a low voltage device?

                              The specifications you provided were insufficient.

                              What is your electrical background?

                              .



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