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Continued Tests of the 3 Battery System

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  • #46
    Is this the meter?

    Great job, Luc! And commendably keeping your thread on track. Thanks to Turion, Cifta, and BroMikey for contributing politely, refereeing, and playing nice, respectively . . . .and with respect.

    This looks to be the meter you're using Luc?
    https://www.ebay.com/itm/DC-20A-7-10...-/271952144643
    $11.99 with free shipping from KY
    Attached Files

    Comment


    • #47
      Originally posted by Turion
      Luc,
      Not quite as much time as you are taking to test it though. It takes FOREVER to do that. And so dang tedious!

      You might take a look at the video you made at 3:55 on day one. You didn't measure the voltage on battery 3, so the voltage I put on the chart is my best guess based on what is shown in the video. If I need to change that, let me know.

      Dave
      I'm sure the voltage reading from the Watt meter should be fine as there's not much difference between each meter.

      Kind regards

      Luc
      Last edited by gotoluc; 11-02-2017, 10:53 PM.

      Comment


      • #48
        Originally posted by Satyam108 View Post
        Great job, Luc! And commendably keeping your thread on track. Thanks to Turion, Cifta, and BroMikey for contributing politely, refereeing, and playing nice, respectively . . . .and with respect.

        This looks to be the meter you're using Luc?
        https://www.ebay.com/itm/DC-20A-7-10...-/271952144643
        $11.99 with free shipping from KY
        Thanks Satyam108

        Yes, that is the meter and at a good price for US residents.

        Kind regards

        Luc

        Comment


        • #49
          I accept your apology BroMikey and glad you now see my intentions are good.

          Kind regards

          Luc

          Comment


          • #50
            11/2/17 (4th day) 20th bat switch

            Link to video:
            https://youtu.be/FfVDCSWDzGk
            Last edited by gotoluc; 11-06-2017, 11:51 AM.

            Comment


            • #51
              That's great Dave!... glad the test is looking promising

              Regards

              Luc

              Comment


              • #52
                11/2/17 (4th day) 21st bat switch

                Link to video:
                https://youtu.be/MsgvhZww0Fc
                Last edited by gotoluc; 11-06-2017, 11:52 AM.

                Comment


                • #53
                  Originally posted by Turion
                  I wonder how much power those three meters consume running the entire time the test is running? It might not be much but it is certainly something.
                  Yes, I though of that as well. To power one meter it uses 0.00091 Amp @ 12vdc and 0.00134 Amp @ 24 vdc
                  Luckily the lab space I have free use of has a high end meter I can measure microamps with precision.
                  Like you said, it's not much but it's good to know and factor in if you wish.

                  Regards

                  Luc
                  Last edited by gotoluc; 11-03-2017, 01:41 AM.

                  Comment


                  • #54
                    11/2/17 (4th day) 22nd bat switch

                    Link to video:
                    https://youtu.be/fIXUuAHkpSQ
                    Last edited by gotoluc; 11-06-2017, 11:52 AM.

                    Comment


                    • #55
                      Originally posted by Turion
                      I wonder how much power those three meters
                      consume running the entire time the test is running? It might not be
                      much but it is certainly something.

                      yes you are right Dave this value could be added into the chart.

                      Here is a quote from a RC site on shunts as all measuring devices such
                      as shown in Luc's video's use built in ones. The one's Luc is using has
                      more functions for even smaller amounts to measure that drives the cost
                      up. I think DROK is one brand name if you wish.

                      For our purposes we only need the ma scale but either device whether
                      cheap or expensive carries an internal shunt. This is simple Ohm's Law
                      math if you want to calculate it out.

                      The built in shunt on the meter i am buying off of ebay

                      https://www.ebay.com/itm/AC-80-260V-20-50-100A-DC-6-5-100V-LCD-Digital-Display-Volt-Amp-Power-Watt-Meter/172621629117?hash=item28310d06bd:m:mqoXQnuea95tb0S E9664FSg

                      is lower at 20 amp size. They also talk about drift and calibration here.

                      it appears that what use to cost hundreds of dollars is now produced
                      for a fraction of that cost and is common place. Anyone can afford these.

                      According to all of the new standards you are looking at .002%+or-

                      i remember John Bedini use to harp on not using amp shunts with
                      his radiant chargers as they were all pulsing and surging constantly
                      and since he was working with a COP of 1.3 it was critical to keep
                      losses way down. Pulsing is another story, losses go higher.


                      http://www.rc-electronics-usa.com/current-shunt.html



                      Ohm's law:

                      V = I R

                      states that the Voltage (V in Volts) across a resistance
                      (R in Ohms) is the product of the resistance and the current
                      I in Amps) flowing through the resistance.

                      For example. A current shunt whose resistance is 0.001 Ohms
                      having a current of 50 Amps flowing through it will produce a voltage
                      of 0.001 50 = 0.05 Volts or 50 mV (milliVolts).

                      So by inserting a current shunt into a circuit whose current you
                      want to measure your can find the current by measuring the voltage
                      drop across the shunt. Then knowing the resistance of the current
                      shunt you can calculate the current using Ohm's law arranged
                      as I = V R.

                      Conversely, if you know the current and the voltage produced
                      across a current shunt you can use Ohm's law to calibrate the
                      current shunt resistance.

                      Last edited by BroMikey; 11-04-2017, 04:50 AM.

                      Comment


                      • #56
                        Originally posted by gotoluc View Post
                        Yes, I though of that as well. To power one meter it uses 0.00091 Amp @ 12vdc and 0.00134 Amp @ 24 vdc
                        Luckily the lab space I have free use of has a high end meter I can measure microamps with precision.
                        Like you said, it's not much but it's good to know and factor in if you wish.

                        Regards

                        Luc
                        Dave, the current measurement I provided you is only the current consumption of the Watt Meters circuit and LCD. It does not include what is dissipated in the Meters Shunt resistor which is either 0.001 Ohm or at most 0.01 Ohm

                        Regards

                        Luc

                        Comment


                        • #57
                          11/2/17 (4th day) 23rd bat switch

                          Link to video:
                          https://youtu.be/IDv5j6YQo5Q
                          Last edited by gotoluc; 11-06-2017, 11:52 AM.

                          Comment


                          • #58
                            11/2/17 (4th day) stopped for the night at 1:15 am

                            Link to video:
                            https://youtu.be/cGa9Z4Bj5L4
                            Last edited by gotoluc; 11-06-2017, 12:15 AM.

                            Comment


                            • #59
                              34.69

                              Originally posted by Turion
                              I am REALLY looking forward to the last test tonight, and here's the data so you can see why.

                              I'm going to put two columns of figures here. they are the last 7 tests. I totaled the voltage in the three batteries each time

                              35.22..........35.6
                              35.45..........35.52
                              34.12 ..........35.02
                              34.87

                              In each of these instances There is a low total followed by a HIGHER total. I have a feeling that ONE battery out of the 3 is not doing so well at taking a charge, just from what I see here. There is ONE weird number. But in all THREE of the complete pairs, the end number is higher than the BEGINNING number.
                              I get 34.69 Dave

                              Comment


                              • #60
                                Test resumed 11/3/17 (5th day) 24th bat switch

                                Link to video:
                                https://youtu.be/ggSUcI70j-E
                                Last edited by gotoluc; 11-06-2017, 11:53 AM.

                                Comment

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