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    Mark,<br>
    <br>
    I've not been into the details yet. My first idea was taking the
    voltage readout at the first defined state encountered (e.g.
    charging / car switched on), or alternatively by collecting the
    maximum voltage.<br>
    <br>
    The max would for example be 15.1 for my Twizy and 13.1 for your
    roadster. Not sure yet if that's sufficient, maybe building a mean
    value over some time would be an option too.<br>
    <br>
    Regards,<br>
    Michael<br>
    <br>
    <br>
    <div class="moz-cite-prefix">Am 20.01.2013 10:36, schrieb Mark
      Webb-Johnson:<br>
    </div>
    <blockquote
      cite="mid:56F0CF2A-4801-4B8E-B496-9D22EF9705B7@webb-johnson.net"
      type="cite">
      <meta http-equiv="Content-Type" content="text/html;
        charset=ISO-8859-1">
      Michael,
      <div><br>
      </div>
      <div>How do you suggest to calibrate? At the moment, what I did
        was to put a few modules on the bench at 12V, then read the ADC
        value from the code, then set the scaling factor as the average
        of those. See inputs.c:</div>
      <div><br>
      </div>
      <div>
        <blockquote style="margin: 0 0 0 40px; border: none; padding:
          0px;">
          <div>
            <div><font face="Andale Mono">float inputs_voltage(void)</font></div>
            <div><font face="Andale Mono">  {</font></div>
            <div><font face="Andale Mono">  ADCON0=0x00;</font></div>
            <div><font face="Andale Mono">  ADCON0=0;   //Select ADC
                Channel #0</font></div>
            <div><font face="Andale Mono">  ADCON0bits.ADON=1;  //switch
                on the adc module</font></div>
            <div><font face="Andale Mono">  ADCON0bits.GO=1;  //Start
                conversion</font></div>
            <div><font face="Andale Mono">  while(ADCON0bits.GO); //wait
                for the conversion to finish</font></div>
            <div><font face="Andale Mono">  ADCON0bits.ADON=0;  //switch
                off adc</font></div>
            <div><font face="Andale Mono"><br>
              </font></div>
            <div><font face="Andale Mono">  return (0.0+ADRES)/47.0;</font></div>
            <div><font face="Andale Mono">  }</font></div>
          </div>
        </blockquote>
      </div>
      <div><br>
      </div>
      <div>The magic number 47.0 is thus really rough, and I suspect not
        at all good.</div>
      <div><br>
      </div>
      <div>I also don't think this needs to be a float. We only need 1
        decimal digit, so storing 10ths of a volt would give us up to
        25.5Volts in an unsigned char, which should be fine.</div>
      <div><br>
      </div>
      <div>Sorry, but that code is quite rough. It was implemented as a
        proof-of-concept, in a rush, when the work on the v2 hardware
        was finishing and the factory in China needed test code
        overnight.</div>
      <div><br>
      </div>
      <div>Given that we don't actually know the voltage in the car
        (without measuring with a voltmeter), and the resistor network
        we use is going to have some variation between modules, I'm not
        really sure how we can auto-calibrate this.</div>
      <div><br>
      </div>
      <div>Regards, Mark.</div>
      <div><br>
        <div>
          <div>On 20 Jan, 2013, at 5:25 PM, Michael Balzer <<a
              moz-do-not-send="true" href="mailto:dexter@expeedo.de">dexter@expeedo.de</a>>
            wrote:</div>
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            <div bgcolor="#FFFFFF" text="#000000"> Mark,<br>
              <br>
              11V is normally recommended as the absolute minimum for
              lead acid, below 11V sulfation may occur.<br>
              <br>
              The discharge curve of the Twizy also shows it begins to
              drop very fast from 11V, so if someone misses the alert
              over night that could already hurt the battery.<br>
              <br>
              I can implement a calibration for the 12V reading, but
              that will need 1 byte RAM... hm... I noticed the voltage
              currently is an int, intentionally?<br>
              If that's not needed I could change that, so overall RAM
              usage will not change.<br>
              <br>
              Regards,<br>
              Michael<br>
              <br>
              <br>
              <div class="moz-cite-prefix">Am 20.01.2013 07:22, schrieb
                Mark Webb-Johnson:<br>
              </div>
              <blockquote
                cite="mid:F1C76EF4-6AA0-47A8-9716-8DD584830379@webb-johnson.net"
                type="cite">
                <meta http-equiv="Content-Type" content="text/html;
                  charset=ISO-8859-1">
                Michael,
                <div><br>
                </div>
                <div>I checked the Sleep() function. Turning off the
                  SIM908 and going to Sleep() seemed to bring overall
                  usage down to 25mA.</div>
                <div><br>
                </div>
                <div>Your code for alert seems to be ok, but I think the
                  thresholds may be too high. The ADC reading is
                  dependent on individual resistor variation (it is just
                  a voltage divider) and I doubt whether it is accurate
                  to more than 0.5V or so. It will scale linearly, but
                  the offset will be wrong. For example, my car shows
                  11.5V as the nominal voltage.</div>
                <div><br>
                </div>
                <div>Perhaps lower the threshold to 11V?</div>
                <div><br>
                </div>
                <div>Regards, Mark.</div>
                <div><br>
                  <div>
                    <div>On 19 Jan, 2013, at 9:36 PM, Michael Balzer
                      <<a moz-do-not-send="true"
                        href="mailto:dexter@expeedo.de">dexter@expeedo.de</a>>

                      wrote:</div>
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                      <div bgcolor="#FFFFFF" text="#000000"> Mark,<br>
                        <br>
                        I just checked in the 12V alert function.<br>
                        <br>
                        It's straight forward and compiles ok, but I
                        cannot test if it triggers and resets correctly
                        under real use conditions -- I've got no power
                        supply with adjustable voltage.<br>
                        <br>
                        As most 12V batteries will be standard lead acid
                        ones, I've set the trigger thresholds to
                        reasonable values for these: The alert will be
                        triggered on voltage drop below 11.5 V and reset
                        on voltage above 11.9 V.<br>
                        <br>
                        Regards,<br>
                        Michael<br>
                        <br>
                        <br>
                        <div class="moz-cite-prefix">Am 19.01.2013
                          11:10, schrieb Michael Balzer:<br>
                        </div>
                        <blockquote
                          cite="mid:50FA710B.8060303@expeedo.de"
                          type="cite">
                          <meta content="text/html; charset=ISO-8859-1"
                            http-equiv="Content-Type">
                          Mark,<br>
                          <br>
                          for the Twizy and maybe other cars, a wakeup
                          from activity on the CAN bus could also be an
                          option. I remember reading about that in the
                          SIM908 manual. The OVMS could generally sleep
                          while the Twizy is off, maybe with an optional
                          timed wakeup every 10-15 minutes for 1-2
                          minutes to detect GPS position changes.<br>
                          <br>
                          Btw, the SIM908 hardware design contains
                          detailed info on the sleep modes and power
                          usages:<br>
                          <a moz-do-not-send="true"
                            class="moz-txt-link-freetext"
href="http://www.mt-system.ru/sites/default/files/sim908-c_hardware_design_v1.03.pdf">http://www.mt-system.ru/sites/default/files/sim908-c_hardware_design_v1.03.pdf</a><br>
                          <br>
                          Thanks for bringing the 12V monitoring to my
                          attention.<br>
                          <br>
                          I'll now first add an SMS alert on the 12V
                          power line getting too low, that's easy to
                          implement and will remind users to charge.<br>
                          <br>
                          Regards,<br>
                          Michael<br>
                          <br>
                          <br>
                          <div class="moz-cite-prefix">Am 19.01.2013
                            10:47, schrieb Mark Webb-Johnson:<br>
                          </div>
                          <blockquote
                            cite="mid:946F2EB5-33B6-46BE-BF8B-B9E8ED9B8419@webb-johnson.net"
                            type="cite">
                            <meta http-equiv="Content-Type"
                              content="text/html; charset=ISO-8859-1">
                            <div><br>
                            </div>
                            Here are the power usage figures from my
                            bench, using v1 hardware:
                            <div><br>
                            </div>
                            <div>
                              <ul class="MailOutline">
                                <li>PIC (normal mode) on, modem powered
                                  down (by power toggle switch): 35mA -
                                  42mA</li>
                                <li>PIC (normal mode) on, modem on, gps
                                  off: 75mA</li>
                                <li>PIC (normal mode) on, modem on,gps
                                  on: 120mA</li>
                                <li>Very short-lived bursts to 160mA at
                                  times, presumably while transmitting
                                  on GSM</li>
                              </ul>
                            </div>
                            <div><br>
                            </div>
                            <div>Playing with AT+CSCLK=2, the modem
                              seems to drop to almost no power usage
                              (perhaps 45mA), with a CR on the async
                              port waking it up.</div>
                            <div><br>
                            </div>
                            <div>Looking at the PIC18F2685 data sheet,
                              it seems that with an external 20MHz
                              oscillator, the normal power consumption
                              is around 30mA to 40mA. Switching to an
                              internal 4MHz oscillator reduces that to
                              5.3mA, and internal 1MHz oscillator to
                              3mA. Sleep mode is 2µA.</div>
                            <div><br>
                            </div>
                            <div>I'll play around with it. So far, it
                              seems it is quite easy to go into
                              low-power sleep mode. It is getting back
                              out that is the tricky bit.</div>
                            <div><br>
                            </div>
                            <div>Regards, Mark.</div>
                            <div><br>
                              <div>
                                <div>On 19 Jan, 2013, at 8:50 AM, Mark
                                  Webb-Johnson <<a
                                    moz-do-not-send="true"
                                    href="mailto:mark@webb-johnson.net">mark@webb-johnson.net</a>>



                                  wrote:</div>
                                <br class="Apple-interchange-newline">
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                                  <meta http-equiv="Content-Type"
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                                  <div style="word-wrap: break-word;
                                    -webkit-nbsp-mode: space;
                                    -webkit-line-break:
                                    after-white-space; ">Michael,
                                    <div><br>
                                    </div>
                                    <div>Urgh. Glad that you managed to
                                      recover it.</div>
                                    <div><br>
                                    </div>
                                    <div>The TMC forums have a few
                                      theads at the moment of Model S
                                      cars with 12V battery issues, and
                                      the Tesla Roadster's little 12V
                                      battery seems to need replacing
                                      every 13 to 25 months.</div>
                                    <div><br>
                                    </div>
                                    <div>For Roadsters, OVMS is not run
                                      off that little 12V battery, so we
                                      haven't seen this issue.</div>
                                    <div><br>
                                    </div>
                                    <div>The good news is that we did
                                      anticipate this sort of thing
                                      (except were expecting to see it
                                      more on ICE cars with OBDII
                                      monitoring). We added 12V power
                                      line monitoring, through an ADC,
                                      into the v2 hardware. Looking at
                                      your logs for the past few days is
                                      interesting (I don't think there
                                      is anything private in their apart
                                      from the vehicleid and odometer,
                                      which I have obscured, so hope you
                                      don't mind me posting here). The
                                      12v line reading is the second to
                                      last column:</div>
                                    <div><br>
                                    </div>
                                    <div>
                                      <blockquote style="margin: 0 0 0
                                        40px; border: none; padding:
                                        0px;"><font face="Andale Mono"
                                          size="2">2013-01-14
                                          06:39:53.930886 -0500 info
                                           main: #34 C XXXXXXX rx msg D
128,0,0,13,17,4,0,YYYY9,28,0,-127,0,120,-1,15.0,0<br>
                                          2013-01-14 06:59:54.871517
                                          -0500 info  main: #34 C
                                          XXXXXXX rx msg D
                                          0,0,0,14,15,4,0,ZZZZ0,0,0,-127,0,0,-1,12.7,0<br>
                                          2013-01-14 07:05:26.666203
                                          -0500 info  main: #34 C
                                          XXXXXXX rx msg D
                                          0,0,0,14,15,4,0,ZZZZ0,0,0,-127,0,0,-1,12.7,0<br>
                                          2013-01-14 07:05:46.498420
                                          -0500 info  main: #34 C
                                          XXXXXXX rx msg D
                                          0,0,0,14,15,4,0,ZZZZ0,0,0,-127,0,0,-1,12.7,0<br>
                                          2013-01-14 07:06:04.864927
                                          -0500 info  main: #34 C
                                          XXXXXXX rx msg D
                                          0,0,0,14,15,4,0,ZZZZ0,0,0,-127,0,0,-1,12.7,0<br>
                                          2013-01-14 07:30:07.228738
                                          -0500 info  main: #34 C
                                          XXXXXXX rx msg D
                                          0,0,0,14,15,4,0,ZZZZ0,0,0,-127,0,0,-1,12.6,0<br>
                                          2013-01-14 08:29:57.461316
                                          -0500 info  main: #34 C
                                          XXXXXXX rx msg D
                                          0,0,0,14,15,4,0,ZZZZ0,0,0,-127,0,0,-1,12.5,0<br>
                                          2013-01-14 09:29:48.441380
                                          -0500 info  main: #34 C
                                          XXXXXXX rx msg D
                                          0,0,0,14,15,4,0,ZZZZ0,0,0,-127,0,0,-1,12.4,0<br>
                                          2013-01-14 11:29:30.755176
                                          -0500 info  main: #34 C
                                          XXXXXXX rx msg D
                                          0,0,0,14,15,4,0,ZZZZ0,0,0,-127,0,0,-1,12.3,0<br>
                                          2013-01-14 15:05:36.688666
                                          -0500 info  main: #54 C
                                          XXXXXXX rx msg D
                                          0,0,0,14,15,4,0,ZZZZ0,0,0,-127,0,0,-1,12.2,0<br>
                                          2013-01-14 16:05:35.111552
                                          -0500 info  main: #54 C
                                          XXXXXXX rx msg D
                                          0,0,0,14,15,4,0,ZZZZ0,0,0,-127,0,0,-1,11.7,0<br>
                                          2013-01-14 16:36:35.755630
                                          -0500 info  main: #54 C
                                          XXXXXXX rx msg D
                                          0,0,0,14,15,4,0,ZZZZ0,0,0,-127,0,0,-1,12.2,0<br>
                                          2013-01-14 18:38:18.404933
                                          -0500 info  main: #54 C
                                          XXXXXXX rx msg D
                                          0,0,0,14,15,4,0,ZZZZ0,0,0,-127,0,0,-1,12.2,0<br>
                                          2013-01-14 21:04:47.187479
                                          -0500 info  main: #54 C
                                          XXXXXXX rx msg D
                                          0,0,0,14,15,4,0,ZZZZ0,0,0,-127,0,0,-1,12.1,0<br>
                                          2013-01-15 02:04:22.801440
                                          -0500 info  main: #54 C
                                          XXXXXXX rx msg D
                                          0,0,0,14,15,4,0,ZZZZ0,0,0,-127,0,0,-1,12.0,0<br>
                                          2013-01-15 09:03:13.233483
                                          -0500 info  main: #54 C
                                          XXXXXXX rx msg D
                                          0,0,0,14,15,4,0,ZZZZ0,0,0,-127,0,0,-1,11.9,0<br>
                                          2013-01-15 11:02:54.400624
                                          -0500 info  main: #54 C
                                          XXXXXXX rx msg D
                                          0,0,0,14,15,4,0,ZZZZ0,0,0,-127,0,0,-1,11.7,0<br>
                                          2013-01-15 12:02:44.724576
                                          -0500 info  main: #54 C
                                          XXXXXXX rx msg D
                                          0,0,0,14,15,4,0,ZZZZ0,0,0,-127,0,0,-1,11.9,0<br>
                                          2013-01-15 13:02:34.285593
                                          -0500 info  main: #54 C
                                          XXXXXXX rx msg D
                                          0,0,0,14,15,4,0,ZZZZ0,0,0,-127,0,0,-1,11.8,0<br>
                                          2013-01-15 16:02:09.372087
                                          -0500 info  main: #54 C
                                          XXXXXXX rx msg D
                                          0,0,0,14,15,4,0,ZZZZ0,0,0,-127,0,0,-1,11.7,0<br>
                                          2013-01-15 17:02:00.235001
                                          -0500 info  main: #54 C
                                          XXXXXXX rx msg D
                                          0,0,0,14,15,4,0,ZZZZ0,0,0,-127,0,0,-1,11.8,0<br>
                                          2013-01-15 19:01:41.695938
                                          -0500 info  main: #54 C
                                          XXXXXXX rx msg D
                                          0,0,0,14,15,4,0,ZZZZ0,0,0,-127,0,0,-1,11.7,0<br>
                                          2013-01-16 02:00:40.126355
                                          -0500 info  main: #54 C
                                          XXXXXXX rx msg D
                                          0,0,0,14,15,4,0,ZZZZ0,0,0,-127,0,0,-1,11.6,0<br>
                                          2013-01-16 06:00:03.073862
                                          -0500 info  main: #54 C
                                          XXXXXXX rx msg D
                                          0,0,0,14,15,4,0,ZZZZ0,0,0,-127,0,0,-1,11.5,0<br>
                                          2013-01-16 11:59:01.907094
                                          -0500 info  main: #54 C
                                          XXXXXXX rx msg D
                                          0,0,0,14,15,4,0,ZZZZ0,0,0,-127,0,0,-1,11.4,0<br>
                                          2013-01-16 15:58:22.520731
                                          -0500 info  main: #54 C
                                          XXXXXXX rx msg D
                                          0,0,0,14,15,4,0,ZZZZ0,0,0,-127,0,0,-1,11.3,0<br>
                                          2013-01-16 17:22:48.691426
                                          -0500 info  main: #54 C
                                          XXXXXXX rx msg D
                                          0,0,0,14,15,4,0,ZZZZ0,0,0,-127,0,0,-1,11.3,0<br>
                                          2013-01-16 17:30:10.701329
                                          -0500 info  main: #54 C
                                          XXXXXXX rx msg D
                                          0,0,0,14,15,4,0,ZZZZ0,0,0,-127,0,0,-1,11.3,0<br>
                                          2013-01-16 17:30:21.837740
                                          -0500 info  main: #54 C
                                          XXXXXXX rx msg D
                                          0,0,0,14,15,4,0,ZZZZ0,0,0,-127,0,0,-1,11.2,0<br>
                                          2013-01-16 17:36:37.811552
                                          -0500 info  main: #54 C
                                          XXXXXXX rx msg D
                                          0,0,0,14,15,4,0,ZZZZ0,0,0,-127,0,0,-1,11.3,0<br>
                                          2013-01-16 17:46:01.164994
                                          -0500 info  main: #54 C
                                          XXXXXXX rx msg D
                                          0,0,0,14,15,4,0,ZZZZ0,0,0,-127,0,0,-1,11.3,0<br>
                                          2013-01-16 17:48:35.257576
                                          -0500 info  main: #54 C
                                          XXXXXXX rx msg D
                                          0,0,0,14,15,4,0,ZZZZ0,0,0,-127,0,0,-1,11.3,0<br>
                                          2013-01-16 17:56:49.565932
                                          -0500 info  main: #54 C
                                          XXXXXXX rx msg D
                                          0,0,0,14,15,4,0,ZZZZ0,0,0,-127,0,0,-1,11.3,0<br>
                                          2013-01-16 18:01:15.186127
                                          -0500 info  main: #54 C
                                          XXXXXXX rx msg D
                                          0,0,0,14,15,4,0,ZZZZ0,0,0,-127,0,0,-1,11.3,0<br>
                                          2013-01-16 18:02:46.866156
                                          -0500 info  main: #54 C
                                          XXXXXXX rx msg D
                                          0,0,0,14,15,4,0,ZZZZ0,0,0,-127,0,0,-1,11.3,0<br>
                                          2013-01-16 18:02:54.217581
                                          -0500 info  main: #54 C
                                          XXXXXXX rx msg D
                                          0,0,0,14,15,4,0,ZZZZ0,0,0,-127,0,0,-1,11.3,0<br>
                                          2013-01-16 18:10:29.930408
                                          -0500 info  main: #54 C
                                          XXXXXXX rx msg D
                                          0,0,0,14,15,4,0,ZZZZ0,0,0,-127,0,0,-1,11.3,0<br>
                                          2013-01-16 18:10:38.723483
                                          -0500 info  main: #54 C
                                          XXXXXXX rx msg D
                                          0,0,0,14,15,4,0,ZZZZ0,0,0,-127,0,0,-1,11.2,0<br>
                                          2013-01-16 18:11:12.459758
                                          -0500 info  main: #54 C
                                          XXXXXXX rx msg D
                                          0,0,0,14,15,4,0,ZZZZ0,0,0,-127,0,0,-1,11.2,0<br>
                                          2013-01-16 18:18:31.863177
                                          -0500 info  main: #54 C
                                          XXXXXXX rx msg D
                                          0,0,0,14,15,4,0,ZZZZ0,0,0,-127,0,0,-1,11.3,0<br>
                                          2013-01-16 18:19:03.123286
                                          -0500 info  main: #54 C
                                          XXXXXXX rx msg D
                                          0,0,0,14,15,4,0,ZZZZ0,0,0,-127,0,0,-1,11.3,0<br>
                                          2013-01-16 18:43:55.355803
                                          -0500 info  main: #54 C
                                          XXXXXXX rx msg D
                                          0,0,0,14,15,4,0,ZZZZ0,0,0,-127,0,0,-1,11.3,0<br>
                                          2013-01-16 18:58:43.567326
                                          -0500 info  main: #54 C
                                          XXXXXXX rx msg D
                                          0,0,0,14,15,4,0,ZZZZ0,0,0,-127,0,0,-1,11.2,0<br>
                                          2013-01-16 22:58:15.314101
                                          -0500 info  main: #54 C
                                          XXXXXXX rx msg D
                                          0,0,0,14,15,4,0,ZZZZ0,0,0,-127,0,0,-1,11.1,0<br>
                                          2013-01-17 01:57:50.181011
                                          -0500 info  main: #54 C
                                          XXXXXXX rx msg D
                                          0,0,0,14,15,4,0,ZZZZ0,0,0,-127,0,0,-1,11.0,0<br>
                                          2013-01-17 02:57:40.587918
                                          -0500 info  main: #54 C
                                          XXXXXXX rx msg D
                                          0,0,0,14,15,4,0,ZZZZ0,0,0,-127,0,0,-1,10.9,0<br>
                                          2013-01-17 03:57:30.418056
                                          -0500 info  main: #54 C
                                          XXXXXXX rx msg D
                                          0,0,0,14,15,4,0,ZZZZ0,0,0,-127,0,0,-1,10.8,0<br>
                                          2013-01-17 04:57:19.241415
                                          -0500 info  main: #54 C
                                          XXXXXXX rx msg D
                                          0,0,0,14,15,4,0,ZZZZ0,0,0,-127,0,0,-1,10.6,0<br>
                                          2013-01-17 05:57:10.622186
                                          -0500 info  main: #54 C
                                          XXXXXXX rx msg D
                                          0,0,0,14,15,4,0,ZZZZ0,0,0,-127,0,0,-1,10.3,0<br>
                                          2013-01-17 06:32:32.593533
                                          -0500 info  main: #55 C
                                          XXXXXXX rx msg D
                                          0,0,0,14,15,4,0,ZZZZ0,0,0,-127,0,0,-1,10.0,0<br>
                                          2013-01-17 07:32:23.932656
                                          -0500 info  main: #55 C
                                          XXXXXXX rx msg D
                                          0,0,0,14,15,4,0,ZZZZ0,0,0,-127,0,0,-1,9.4,0<br>
                                          2013-01-17 08:32:13.374380
                                          -0500 info  main: #55 C
                                          XXXXXXX rx msg D
                                          0,0,0,14,15,4,0,ZZZZ0,0,0,-127,0,0,-1,7.9,0<br>
                                          2013-01-17 09:32:03.204557
                                          -0500 info  main: #55 C
                                          XXXXXXX rx msg D
                                          0,0,0,14,15,4,0,ZZZZ0,0,0,-127,0,0,-1,7.2,0<br>
                                          2013-01-17 10:31:52.551362
                                          -0500 info  main: #55 C
                                          XXXXXXX rx msg D
                                          0,0,0,14,15,4,0,ZZZZ0,0,0,-127,0,0,-1,6.5,0<br>
                                          2013-01-17 11:31:41.821330
                                          -0500 info  main: #55 C
                                          XXXXXXX rx msg D
                                          0,0,0,14,15,4,0,ZZZZ0,0,0,-127,0,0,-1,6.7,0<br>
                                          2013-01-17 12:58:48.540906
                                          -0500 info  main: #60 C
                                          XXXXXXX rx msg D
                                          128,0,0,13,1,2,0,ZZZZ8,0,0,-127,0,120,-1,15.1,0</font></blockquote>
                                    </div>
                                    <div><br>
                                    </div>
                                    <div>It shows 15v at the start (I
                                      guess when the car is on and
                                      charging it), then 12.7v
                                      at 2013-01-14 06am EST, then falls
                                      gradually to 11.0v at 2013-01-17
                                      01am EST. At that point it seems
                                      to fall faster, down to the last
                                      report (just 10 hours later)  6.7v
                                      at 2013-01-17 11am EST.</div>
                                    <div><br>
                                    </div>
                                    <div>My original thought to handle
                                      this was to have two thresholds.</div>
                                    <div><br>
                                    </div>
                                    <div>At the first threshold, the PIC
                                      would turn off the modem and
                                      re-awake only once every 12 hours,
                                      for 2 minutes, before going back
                                      to sleep.</div>
                                    <div><br>
                                    </div>
                                    <div>At the second threshold, the
                                      PIC would turn off the modem, and
                                      go to a deep sleep itself. In this
                                      mode, once power was restored it
                                      would reset itself.</div>
                                    <div><br>
                                    </div>
                                    <div>Exit from either mode would be
                                      the 12v power line going back
                                      above the first threshold plus
                                      some safety margin.</div>
                                    <div><br>
                                    </div>
                                    <div>This weekend, I'll get some
                                      exact power measurements from the
                                      v2 hardware module, so we know
                                      what we are dealing with:</div>
                                    <div><br>
                                    </div>
                                    <div>
                                      <ul class="MailOutline">
                                        <li>Just the PIC (modem powered
                                          down)</li>
                                        <li>PIC + MODEM</li>
                                        <li>PIC + MODEM + GPS</li>
                                      </ul>
                                    </div>
                                    <div><br>
                                    </div>
                                    <div>Last time I tested this, on v1
                                      hardware without GPS, these were
                                      the figures for PIC + MODEM:</div>
                                    <div><br>
                                    </div>
                                    <div>
                                      <ul class="MailOutline">
                                        <li>Idle: 40mA @12V</li>
                                        <li>Cellular Network
                                          Registration: 100mA @12V</li>
                                        <li>Network activity: 80mA @12V</li>
                                      </ul>
                                    </div>
                                    <div><br>
                                    </div>
                                    <div>Regards, Mark.</div>
                                    <div><br>
                                      <div>
                                        <div>On 18 Jan, 2013, at 10:47
                                          PM, Michael Balzer <<a
                                            moz-do-not-send="true"
                                            href="mailto:dexter@expeedo.de">dexter@expeedo.de</a>>



                                          wrote:</div>
                                        <br
                                          class="Apple-interchange-newline">
                                        <blockquote type="cite">Mark,
                                          List,<br>
                                          <br>
                                          yesterday my Twizy was
                                          temporarily dead... because of
                                          the OVMS power usage.<br>
                                          <br>
                                          I had not driven for 5 days.
                                          The Twizy has a very small 12V
                                          battery with only 14 Ah
                                          capacity, and it only gets
                                          charged while charging the
                                          Twizy and while driving (from
                                          the main battery).<br>
                                          <br>
                                          The OVMS with GPS activated
                                          needs a constant current of
                                          ~110 mA according to my
                                          measurement, thus sucking that
                                          battery empty within 4-5 days,
                                          maybe fewer. I'll make the
                                          power warning much more
                                          prominent in the Twizy user
                                          guide.<br>
                                          <br>
                                          Have there been any
                                          considerations yet about using
                                          the sleep mode of the PIC
                                          and/or SIM chipset?<br>
                                          <br>
                                          Regards,<br>
                                          Michael<br>
                                          <br>
                                          -- <br>
                                          Michael Balzer * Paradestr. 8
                                          * D-42107 Wuppertal<br>
                                          Fon 0202 / 272 2201 * Handy
                                          0176 / 206 989 26<br>
                                          <br>
                                          <span><dexter.vcf></span>_______________________________________________<br>
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                                      <br>
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                                  </div>
                                </blockquote>
                              </div>
                              <br>
                            </div>
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                          <pre class="moz-signature" cols="72">-- 
Michael Balzer * Paradestr. 8 * D-42107 Wuppertal
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                        <pre class="moz-signature" cols="72">-- 
Michael Balzer * Paradestr. 8 * D-42107 Wuppertal
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Michael Balzer * Paradestr. 8 * D-42107 Wuppertal
Fon 0202 / 272 2201 * Handy 0176 / 206 989 26
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