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MPPT Charge controllers and Panel Connections

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  • MPPT Charge controllers and Panel Connections

    Looking at connecting 48 (310 watt) solar panels to a 48 volt battery bank and looking for some advise on best options for charge controllers within reason.
    Also best options for connecting panels eg how many panels in series etc for best use of controller voltage range etc.

    Panel specs are

    Vmpp 38.47
    Impp 8.06
    Voc 45.47
    Isc 8.67


    Any advise would be greatly appreciated.....

  • #2
    to help you, we would need to know you local weather extremes (particularly cold) and the pv modules temperature coefficient.
    OutBack FP1 w/ CS6P-250P http://bit.ly/1Sg5VNH

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    • #3
      See attached for specs.
      Location is Perth , WESTERN AUSTRALIA
      Attached Files

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      • #4
        Magnum PT-100 is a monster of a controller, Midnight Classic, Morningstar MPPT series and the Schneider 600V-80A controller are also strong contenders.
        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

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        • #5
          Originally posted by Simo View Post
          Looking at connecting 48 (310 watt) solar panels to a 48 volt battery bank and looking for some advise on best options for charge controllers within reason...
          You are talking 3 expensive charge controllers.

          MSEE, PE

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          • #6
            Having a bit of trouble trying to figure out the best string combination and number of controllers required?

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            • #7
              That's about 15Kw of PV. ( 14880w ). Into 48V, that would be 310 amps. [ those numbers are a bit odd, 48V 48panels 310watt panels, 310A)
              That will need at least 3 of the big PT-100 controllers, running near 100% capacity. That's also going to need a giant 48V bank, a couple fork lift batteries.
              You have to peruse each mfg's web site, and play with the string sizer to determine what your system design will be. You CANNOT just buy stuff and lash it together.
              PT-100 180Vmax 100A (3ea)
              Schneider 600V 80A (4ea)
              Morningstar 600V 60A (6ea)
              Morningstar 150V 60A (6ea)
              Midnighgt Classic 150V 70A (5ea)
              Which ones network easier ?
              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


              • #8
                Nobody seems to be asking the big questions here, like "What are you trying to accomplish?" What is the goal here? Are you planning on running a single household, a vacation cabin, a rural farmstead, or a vacation resort? Do you actually have forty-eight 310 watt panels, or is this just some "back of the envelope" calculation? As Mike says, almost 15kwatts of solar panels would be part of a massive system, which would need the correspondingly massive battery system and a massive electronics array.

                Are you going to have all the panels pointed north, or will they be divided between north, east, and west. That will in part determine what your maximum amperage will be. Assuming all the panels are pointed north, and they're at optimum angle, you'll need a battery bank that can absorb 250-300 amps of current. Those batteries do exist, Trojan IND33s for example, but they cost >1000$US and weigh 125kg each. And you'd need 24 of them for a 48V system. So, where are these numbers coming from? What do you need to power that needs that kind of capacity?

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                • #9
                  Originally posted by MichaelK! View Post
                  Nobody seems to be asking the big questions here, like "What are you trying to accomplish?" What is the goal here? Are you planning on running a single household, a vacation cabin, a rural farmstead, or a vacation resort?...
                  Always been pointless in the past

                  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


                  • #10
                    Originally posted by Mike90250 View Post
                    Always been pointless in the past
                    Well 15kw should handle a coffee pot and microwave.

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                    • #11
                      Originally posted by MichaelK! View Post
                      Nobody seems to be asking the big questions here, like "What are you trying to accomplish?"
                      We gave up asking fools that question years ago. As Mike said it is pointless. 15 Kw panel system requires a new 9000 pound $29,000 battery every 5 years. Who cares?

                      MSEE, PE

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                      • #12
                        Looking at running a rural homestead on standalone solar.
                        15kw panels
                        2 x 8kva inverters
                        24 x 2v 1500ah OPzV batteries.

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                        • #13
                          Is this equipment list based on estimated loads, which will dictate your battery bank capacity, which will dictate your charging requirements, based on local conditions, taking your worst insolation month and temprature extremes into consideration.. Generator? You will need one. Are the inverters listed based on max surge needs?

                          The list provided just sounds a bit simplified without actual model numbers. The only model number you have given is for gel telecom batteries which aren't well suited to daily cycle applications and aggressive charging. Looks like you intend on investing a pretty good chunk of change into this project. For a system this size you really need to have the system designed by someone who is well versed at designing a well balanced system on this scale.
                          2.2kw Suntech mono, Classic 200, NEW Trace SW4024

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                          • #14
                            Originally posted by Simo View Post
                            Looking at running a rural homestead on standalone solar.
                            15kw panels
                            2 x 8kva inverters
                            24 x 2v 1500ah OPzV batteries.
                            Hope you can afford replacing those batteries every year or two. They are not deep cycle batteries.

                            As for me I am out of this thread. You cannot help a fool and no point in trying.
                            MSEE, PE

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                            • #15
                              Wow. My guess is that system cost at least $75k and those batteries will be a money pit for years to come. I guess the OP can justify that type of expense to live off grid but if it was my money I would find another way to get power to my home.

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