Solar Kid or TS-MPPT? Which one?

rp3703rp3703 Registered Users Posts: 61 ✭✭

So I am putting together a solar electric system that will use 3 270 watt panels to get 810 watts total and those panels will be used to charge a series parallel 24V/460AH bank of four 6 volt titan 105’s. I now need to make a decision on a charge controller. I have narrowed it down to either the Midnite Solar Kid or the Morning Star TS-MPPT-45 but would appreciate any other suggestions as well as any input on experiences using these two units.

Comments

  • PhotowhitPhotowhit Solar Expert Posts: 4,201 ✭✭✭✭
    rp3703 said:
    "...a series parallel 24V/460AH bank of four 6 volt titan 105’s...."
    Are they just in series for 24 volts?

    I would prefer the TS-MPPT-45, just because, as one of our former moderators was fond of saying "Loads grow" and so do system, it would be nice to have the extra room to add some panels.
    Home system 4000 watt (Evergreen) array standing, with 2 Midnite Classic Lites,  Midnite E-panel, Prosine 1800 and Exeltech 1100, ForkLift battery. Off grid for @13 of last 14 years. 1000 watts being added to current CC, @2700 watts to be added with an additional CC.
  • rp3703rp3703 Registered Users Posts: 61 ✭✭
    I was thinking series & parallel with 4 6V 220AH Trojan's for a 24V 440AH output. So by "loads grow" you mean get an over sized charge controller? The Midnite allows you to run multiple units as the system load increases.
  • mcgivormcgivor Registered Users Posts: 1,204 ✭✭✭✭
    Photowhit said:
    rp3703 said:
    "...a series parallel 24V/460AH bank of four 6 volt titan 105’s...."
    Are they just in series for 24 volts?

    I would prefer the TS-MPPT-45, just because, as one of our former moderators was fond of saying "Loads grow" and so do system, it would be nice to have the extra room to add some panels.
    For that matter why not  go with  the TS 60 MPPT,  and oh yes,, you will expand , it's an evolution 
      1500W, 6× Schutten 250W Poly panels , Schneider 150 60 CC, Schneider SW 2524 inverter, 8×T105 GC 24V nominal 

  • PhotowhitPhotowhit Solar Expert Posts: 4,201 ✭✭✭✭
    rp3703 said:
    I was thinking series & parallel with 4 6V 220AH Trojan's for a 24V 440AH output. So by "loads grow" you mean get an over sized charge controller? The Midnite allows you to run multiple units as the system load increases.

    If they are in series  +6-+6-+6-+6- = 24 volts @ 220 aamphours

    If they are in series and parallel
           +6-+6-
    +<                 >- = 12 volt @ 440 amp hours
            +6-+6-

    At 12 volts, the array might fit on a Morning Star TS-MPPT-45 but you would be better off going to a 60 amp charge controller

    At 24 volts, either would work x2 the voltage = 1/2 the amps
    amps x volts =watts
    watts/amps=volts
    watts/volts=amps


    Home system 4000 watt (Evergreen) array standing, with 2 Midnite Classic Lites,  Midnite E-panel, Prosine 1800 and Exeltech 1100, ForkLift battery. Off grid for @13 of last 14 years. 1000 watts being added to current CC, @2700 watts to be added with an additional CC.
  • BB.BB. Super Moderators Posts: 26,768 admin
    10% rate of charge (nominal for full time off grid) of a 440 AH battery bank would be 44 amps... If you ever decide to go a bit more say 13% rate of charge:
    • 440 AH * 29 volts charging * 0.77 panel+controller derating * 0.13 rate of charge = 1,277 Watt array
    • 440 AH * 0.13 rate of charge = 57 Amps charging current (typical maximum rate of charge)
    A 60 amp charge controller would certainly be justifiable if/when you decide to add a bit more to your array.

    -Bill
    Near San Francisco California: 3.5kWatt Grid Tied Solar power system+small backup genset
  • PhotowhitPhotowhit Solar Expert Posts: 4,201 ✭✭✭✭
    BB. said:
     
    440 AH * 29 volts charging * 0.77 panel+controller derating * 0.13 rate of charge = 1,277 Watt array
    I don't think his balance of panels to battery bank is bad here, I suspect we have the battery count correct at 4, just not the correct amp hour rating.
    Home system 4000 watt (Evergreen) array standing, with 2 Midnite Classic Lites,  Midnite E-panel, Prosine 1800 and Exeltech 1100, ForkLift battery. Off grid for @13 of last 14 years. 1000 watts being added to current CC, @2700 watts to be added with an additional CC.
  • rp3703rp3703 Registered Users Posts: 61 ✭✭
    Sorry, bad math. Four 6V 225AH T105's wired series/parallel would yield 12V @ 450AH. Bill, you already did my load calculations in this thread http://forum.solar-electric.com/discussion/351661/water-pressure-pump#latest . You came up with 790 Watts and 440 AH.
  • BB.BB. Super Moderators Posts: 26,768 admin
    Sorry. Quick skim and saw 24 volt.

    Continue on!

    - Bill
    Near San Francisco California: 3.5kWatt Grid Tied Solar power system+small backup genset
  • rp3703rp3703 Registered Users Posts: 61 ✭✭
    So it sounds like the consensus is on Morning Star. With only about $100 difference between the 45 and the 60, I'll probably just go with the 60. Thanks for the help.
  • mike95490mike95490 Solar Expert Posts: 7,249 ✭✭✭✭
    mcgivor said:
    For that matter why not  go with  the TS 60 MPPT,  and oh yes,, you will expand , it's an evolution 
    And you get the spiffy web server in it too.  Owning both Midnight an Morningstar, my 3rd controller was another MS-MPPT-60
    Powerfab top of pole PV mount | 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 ,

  • EstragonEstragon Registered Users Posts: 1,428 ✭✭✭✭
    If the choice was kid vs ts45, I would go for the ts in this application.

    Looking at a 60 for future expansion though, I might consider a MN classic good for 96a.
    Off-grid.  
    Main daytime system ~4kw panels into 2xMNClassic150 370ah 48v bank 2xOutback 3548 inverter 120v + 240v autotransformer
    Night system ~1kw panels into 1xMNClassic150 700ah 12v bank morningstar 300w inverter
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