Generator advice

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  • choob
    Member
    • Oct 2015
    • 65
    #1

    Generator advice

    I'm installing well pump and contracted the installation to the local specialist company. They're suggesting a 10kva genset. Looking over the spec of the pumps they're suggesting I noticed that the three phase startup power for the smallest 3HP pump is 415V * 26A = 10.7kW.

    According to this website I need an 11.3kVA genset for DOL start http://www.dieselserviceandsupply.co...alculator.aspx

    They were suggesting the same genset for a 5.5HP pump which the website suggests needs min 21kVA for direct online start.

    Comments welcome.
    Tags: None
    • inetdog
      Super Moderator
      • May 2012
      • 9909
      #2
      Originally posted by choob
      I'm installing well pump and contracted the installation to the local specialist company. They're suggesting a 10kva genset. Looking over the spec of the pumps they're suggesting I noticed that the three phase startup power for the smallest 3HP pump is 415V * 26A = 10.7kW or about 13kVA.

      According to this website I need an 11.3kVA genset for DOL start http://www.dieselserviceandsupply.co...alculator.aspx

      They were suggesting the same genset for a 5.5HP pump which the website suggests needs min 21kVA for direct online start.

      Comments welcome.
      You may find it cost effective to add a solid state soft starter or a full fledged VFD (Variable Frequency Drive) to run the pump. That way you need only size the generator for the running Amps of the pump instead of the peak starting Amps.
      This would no longer be direct online starting.
      SunnyBoy 3000 US, 18 BP Solar 175B panels.

        Comment

        • Mike90250
          Moderator
          • May 2009
          • 16020
          #3
          Generators have the advantage of a rotating mass (flywheel) and that helps power the unit through a brief starting surge for motors. Inverter-Generators do not have this advantage.
          3-phase motors don't have anywhere near the severe starting load that a single phase motor imposes on the electrical system. So there is some wiggle room on the 3 phase stuff, be sure you get a 3 phase genset !
          Powerfab top of pole PV mount (2) | Listeroid 6/1 w/st5 gen head | XW6048 inverter/chgr | Iota 48V/15A charger | Morningstar 60A MPPT | 48V, 800A NiFe Battery (in series)| 15, Evergreen 205w "12V" PV array on pole | Midnight ePanel | Grundfos 10 SO5-9 with 3 wire Franklin Electric motor (1/2hp 240V 1ph ) on a timer for 3 hr noontime run - Runs off PV ||
          || Midnight Classic 200 | 10, Evergreen 200w in a 160VOC array ||
          || VEC1093 12V Charger | Maha C401 aa/aaa Charger | SureSine | Sunsaver MPPT 15A

          solar: http://tinyurl.com/LMR-Solar
          gen: http://tinyurl.com/LMR-Lister

            Comment

            • RockyinNM
              Junior Member
              • Oct 2016
              • 14
              #4
              You did not state how many-GPM's you need, or how deep to the static level of the well?
              I'm running a Grundfos (11gpm) AC or DC--I'm running mine on Solar-more info if U need it.
              Rocky in NM
              36 evacuated tube, drain back solar hot water

                Comment

                • choob
                  Member
                  • Oct 2015
                  • 65
                  #5
                  We're looking at minimum 2000L per hour, static level about 170m according to survey. Not for domestic use.

                    Comment

                    • RockyinNM
                      Junior Member
                      • Oct 2016
                      • 14
                      #6
                      wish I could help, mine is small compared to your needs--
                      That said, Grundfos makes many sizes, that have soft start AC only, and AC/DC--ck them out
                      36 evacuated tube, drain back solar hot water

                        Comment

                        • CaliBerger
                          Junior Member
                          • Nov 2017
                          • 3
                          #7
                          Originally posted by RockyinNM
                          You did not state how many-GPM's you need, or how deep to the static level of the well?
                          I'm running a Grundfos (11gpm) AC or DC--I'm running mine on Solar-more info if U need it.
                          Rocky in NM
                          Would like to hear more about your setup Rocky
                          I'm in the process of getting 230-1 phase service from my utility which will run a Grundfos 230-3 phase pump via a VFD
                          I'm interested in the possibility of installing of a gird tied solar system

                            Comment

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