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    Offgrid PoE options

    Scheduled Pinned Locked Moved IT Discussion
    ubntengenius powerbridgeeap9550offgriddc powerpoe
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    • gjacobseG
      gjacobse @jt1001001
      last edited by

      @jt1001001 said in Offgrid PoE options:

      Field Day by chance?? I can see what our club's doing this year I'm not part of the wifi project but they are in a similar boat.

      Yes - Field day. While the computers and the network can be on AC mains, just trying to simplify the cabling.

      I am perfectly fine with having to use the PoE injectors, but I need DC input. I can manage - with simple DC-DC supply taking 12v (13.8-14.2v) and stepping it up to 24v and 48v.

      1 Reply Last reply Reply Quote 0
      • JaredBuschJ
        JaredBusch
        last edited by

        I would get some of these because you can power these with 12vdc
        0_1493214260123_IMG_6109.PNG

        1 Reply Last reply Reply Quote 2
        • gjacobseG
          gjacobse
          last edited by gjacobse

          The mast - minus the extension and cable management

          0_1493218097599_IMG_1568.JPG

          The AC power

          1_1493218097601_IMG_1570.JPG

          1 Reply Last reply Reply Quote 2
          • gjacobseG
            gjacobse
            last edited by gjacobse

            By far the prettiest setup here,...

            But six 18650 cells pulled from laptops running 12v ouput into a 175w inverter for AC power.

            0_1493220709773_IMG_1571.JPG

            1 Reply Last reply Reply Quote 2
            • MattSpellerM
              MattSpeller
              last edited by

              Was pondering about this lastnight and I discovered that 48v flooded lead acid batteries are a thing. Probably be cheaper to go with 3 12v VRLA batteries like the ones used in a UPS. Do you know what kind of power draw you have right now?

              gjacobseG 1 Reply Last reply Reply Quote 0
              • gjacobseG
                gjacobse @MattSpeller
                last edited by

                @MattSpeller said in Offgrid PoE options:

                Was pondering about this lastnight and I discovered that 48v flooded lead acid batteries are a thing. Probably be cheaper to go with 3 12v VRLA batteries like the ones used in a UPS. Do you know what kind of power draw you have right now?

                UBNT Switching PoE PSU

                • 24v @ 1amp - so 24watts

                EnGenius

                • 18v @ .38amp - so 18.24watts max

                Even if I toss in a 5port Smart switch - 7.5v @ 1 amp I'm below the 175 Inverter.

                MattSpellerM 1 Reply Last reply Reply Quote 1
                • MattSpellerM
                  MattSpeller @gjacobse
                  last edited by MattSpeller

                  @gjacobse said in Offgrid PoE options:

                  @MattSpeller said in Offgrid PoE options:

                  Was pondering about this lastnight and I discovered that 48v flooded lead acid batteries are a thing. Probably be cheaper to go with 3 12v VRLA batteries like the ones used in a UPS. Do you know what kind of power draw you have right now?

                  UBNT Switching PoE PSU

                  • 24v @ 1amp - so 24watts

                  EnGenius

                  • 18v @ .38amp - so 18.24watts max

                  Even if I toss in a 5port Smart switch - 7.5v @ 1 amp I'm below the 175 Inverter.

                  18v @ .38a = 7w

                  so you're well below 175, which is good

                  solar + 18650 pack?

                  what kinda panels are you thinking of?

                  1 Reply Last reply Reply Quote 0
                  • MattSpellerM
                    MattSpeller
                    last edited by MattSpeller

                    So per day you need about 1kwh to run everything at max (a safe assumption)

                    So you need to generate 1kwh+ over ~7h of sun

                    1000/7=143w

                    spec 200w of panels and you're solid

                    probably go for 2kwh pack for wiggle room + 50% degradation over time

                    I like to massively over build things so YMMV

                    Probably don't need near that much solar if I'm being honest - I think your draw will not be more than 0.5kwh/day but you can check that with a kill-a-watt or something

                    gjacobseG 1 Reply Last reply Reply Quote 0
                    • gjacobseG
                      gjacobse @MattSpeller
                      last edited by

                      @MattSpeller said in Offgrid PoE options:

                      So per day you need about 1kwh to run everything at max (a safe assumption)

                      So you need to generate 1kwh+ over ~7h of sun

                      1000/7=143w

                      spec 200w of panels and you're solid

                      probably go for 2kwh pack for wiggle room + 50% degradation over time

                      I like to massively over build things so YMMV

                      Probably don't need near that much solar if I'm being honest - I think your draw will not be more than 0.5kwh/day but you can check that with a kill-a-watt or something

                      yea,.. I rather like to over build / complicate things ... so - just like to error on the side of caution also.

                      scottalanmillerS 1 Reply Last reply Reply Quote 1
                      • scottalanmillerS
                        scottalanmiller @gjacobse
                        last edited by

                        @gjacobse said in Offgrid PoE options:

                        @MattSpeller said in Offgrid PoE options:

                        So per day you need about 1kwh to run everything at max (a safe assumption)

                        So you need to generate 1kwh+ over ~7h of sun

                        1000/7=143w

                        spec 200w of panels and you're solid

                        probably go for 2kwh pack for wiggle room + 50% degradation over time

                        I like to massively over build things so YMMV

                        Probably don't need near that much solar if I'm being honest - I think your draw will not be more than 0.5kwh/day but you can check that with a kill-a-watt or something

                        yea,.. I rather like to over build / complicate things ... so - just like to error on the side of caution also.

                        Over complicating things is erroring on the side of reckless actually.

                        gjacobseG 1 Reply Last reply Reply Quote 0
                        • gjacobseG
                          gjacobse @scottalanmiller
                          last edited by

                          @scottalanmiller said in Offgrid PoE options:

                          @gjacobse said in Offgrid PoE options:

                          @MattSpeller said in Offgrid PoE options:

                          So per day you need about 1kwh to run everything at max (a safe assumption)

                          So you need to generate 1kwh+ over ~7h of sun

                          1000/7=143w

                          spec 200w of panels and you're solid

                          probably go for 2kwh pack for wiggle room + 50% degradation over time

                          I like to massively over build things so YMMV

                          Probably don't need near that much solar if I'm being honest - I think your draw will not be more than 0.5kwh/day but you can check that with a kill-a-watt or something

                          yea,.. I rather like to over build / complicate things ... so - just like to error on the side of caution also.

                          Over complicating things is erroring on the side of reckless actually.

                          I'm no where near the level of NASA though... but - different reasons there.

                          1 Reply Last reply Reply Quote 1
                          • TeleFoxT
                            TeleFox
                            last edited by

                            Power inverter...

                            JaredBuschJ 1 Reply Last reply Reply Quote 1
                            • JaredBuschJ
                              JaredBusch @TeleFox
                              last edited by

                              @TeleFox said in Offgrid PoE options:

                              Power inverter...

                              Power inverters are great but inefficient. So for a field day with a DC power source, I would attempt to keep as much DC as possible.

                              gjacobseG TeleFoxT 2 Replies Last reply Reply Quote 2
                              • gjacobseG
                                gjacobse @JaredBusch
                                last edited by

                                @JaredBusch said in Offgrid PoE options:

                                @TeleFox said in Offgrid PoE options:

                                Power inverter...

                                Power inverters are great but inefficient. So for a field day with a DC power source, I would attempt to keep as much DC as possible.

                                That would be the preference...

                                JaredBuschJ 1 Reply Last reply Reply Quote 0
                                • JaredBuschJ
                                  JaredBusch @gjacobse
                                  last edited by JaredBusch

                                  @gjacobse said in Offgrid PoE options:

                                  @JaredBusch said in Offgrid PoE options:

                                  @TeleFox said in Offgrid PoE options:

                                  Power inverter...

                                  Power inverters are great but inefficient. So for a field day with a DC power source, I would attempt to keep as much DC as possible.

                                  That would be the preference...

                                  That is why i recommended the trendnet PoE injector. it uses a 12vdc source with a wall wart normally. so it shoudl be easy to make a connector for.

                                  The model i linked was gigabit, you probably don't need that one.

                                  1 Reply Last reply Reply Quote 0
                                  • TeleFoxT
                                    TeleFox @JaredBusch
                                    last edited by

                                    @JaredBusch with a power conditioner?

                                    JaredBuschJ gjacobseG 2 Replies Last reply Reply Quote 0
                                    • JaredBuschJ
                                      JaredBusch @TeleFox
                                      last edited by

                                      @TeleFox said in Offgrid PoE options:

                                      @JaredBusch with a power conditioner?

                                      I assume that @gjacobse is handling any DC conditioning needed.

                                      I was wrong that it was 12vdc input though.
                                      Here is mine at home.
                                      0_1493404794088_IMG_6121.JPG

                                      @gjacobse you may want to looks for a 24v passive PoE injector with a DC input. The UBNT ones are all AC.

                                      1 Reply Last reply Reply Quote 1
                                      • TeleFoxT
                                        TeleFox
                                        last edited by

                                        But wouldn't injectors require a ton of plugs to be laid out?

                                        MattSpellerM JaredBuschJ 2 Replies Last reply Reply Quote 0
                                        • MattSpellerM
                                          MattSpeller @TeleFox
                                          last edited by

                                          @TeleFox said in Offgrid PoE options:

                                          But wouldn't injectors require a ton of plugs to be laid out?

                                          How so?

                                          TeleFoxT 1 Reply Last reply Reply Quote 0
                                          • TeleFoxT
                                            TeleFox @MattSpeller
                                            last edited by

                                            @MattSpeller Because each POE injector requires an outlet to power it and push the power inline to the cable.

                                            1 Reply Last reply Reply Quote 0
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