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High end custom trailer build

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  • #61
    Have noticed that we always go to 57.6V absorb after using micro-wave as it just did when Elaine used it for 15 minutes. It took about an hour before it went to float. Talked to son about this today and he said basically, well yes, that is what occurs.
    Reed and Elaine

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    • #62
      Originally posted by paulcheung View Post
      I set my Rolls at 60 volts on 48 volt system which is 15 volts per 12 volts. since then I have less under charge problems.
      Good job, you are learning quick.
      MSEE, PE

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      • #63
        The batteries are Sun Xtender PVX-4050HT, qty 4.

        http://www.sunxtender.com/solarbattery.php?id=30

        Thanks
        Jordan

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        • #64
          Originally posted by FlyLow View Post
          The batteries are Sun Xtender PVX-4050HT, qty 4.

          http://www.sunxtender.com/solarbattery.php?id=30
          OK that makes life real simple and easy. Those are AGM batteries and things change a bit. You only need two voltages set:

          Absorb = 28.8
          EQ = 31.0 for 8 hours
          MSEE, PE

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          • #65
            48 V DC air conditioner by King Tech

            Have read about the King Tech 48 V DC air conditioner on a few threads and wrote to the manufacurer for further information. This might be a good idea considering the power loss going through the inverter to an energy hog Dometic air conditoner. King Tec claims that the a/c uses only 750 W. As noted earlier in thread, we have run a/c for almost 4 hours as combination of solar/LFP batteries, but this system would totally on solar input during most of the day. It would also run for 4 or 5 hours after dark.

            If manufacturer claims are correct, this would be a most useful addition to a high end trailer with 1000 W or more solar and sufficient battery bank. Ours is 48V nominal (54.6 V float) so it would be a perfect fit. Might use as removable window or fixed roof unit in bedroom.

            Reed and Elaine

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            • #66
              I liked the midnight solar panel so much I decided to use it as a breaker box for all of the DC loads.



              There is a lot going on here...


              I used 2 awg locomotive cable from the combiner and to the batts from the CC.

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              • #67
                I brought my trailer into town today to change the CC settings today. I connected it to my computer to change bulk=absorb=float=28.8V, its not going to be that easy for me. There are way more settings than I am qualified for. Would you please help me set them correctly.

                Overview of system

                24V
                sun xtender AGM 405 A/HR
                750w pv
                morningstar MPPT 60a

                regulation voltage: 28.8V
                temp compensation: current setting -.060v
                max compensation temp: 80 deg C
                absorb time: 2:30:00 H:M:S
                float:28.8V
                float timeout: 1:0:0
                float cancel Voltage: ??
                HVD: ??
                HVDR: ??
                max regulation limit: ??
                array voltage fixed target: disabled

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                • #68
                  This is copied from a guy over on ASW with the same AGM batteries.


                  Absorption Voltage = 28.6V

                  Absorption Time = 2 hours

                  Absorption Extension Voltage = 24.4V

                  Absorption Extension Time = 30 min

                  Battery Temperature Compensation = -0.049V/degC

                  Maximum Compensation Temp = 40 degC

                  Minimum Compensation Temp = -1 degC

                  Float Voltage = 26.6V

                  Float Timeout = 30 min

                  Float Cancel Voltage = 24.0V

                  Equalize Voltage = 31.0V

                  Equalize Time = 120 minutes

                  Auto Equalize Interval = 28 days

                  Equalize Timeout = 180 minutes

                  High Voltage Disconnect =31.8V

                  High Voltage Reconnect =28.0V

                  Max. Regulation Limit = 30.8V

                  Battery Current Limit = None

                  Battery Service Reminder = Off

                  Enable Fixed Array Voltage Target = off

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