Cheap Freeze tolerant Charge Controller

KhellSkKhellSk Registered Users Posts: 82 ✭✭

i need a chrg ctrl that can wistand -34F rated 12v at least 5A as cheap as possible. Any of you got suggestion ?

All i can find as an lcd screen on it. I doubt that gonna work.
[2x Flooded  6v 210ah][12v 30a 400wMax CC]
[5x 48w 15.9Vmp + 1x 100w 17Vmp]


  • PhotowhitPhotowhit Solar Expert Posts: 5,989 ✭✭✭✭✭
    I would think LCD might not be the problem you think it is unless you need to inspect the screen. I've had my Midnight classic's down to -10, but I don't check the screen. It appears to have survived ok, it does use a bit of energy at idle, so maybe warms it a bit.

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    Home system 4000 watt (Evergreen) array standing, with 2 Midnite Classic Lites,  Midnite E-panel, Magnum MS4024, Prosine 1800(now backup) and Exeltech 1100(former, 660 ah 24v Forklift battery(now 10 years old). Off grid for 20 years (if I include 8 months on a bicycle).
    - Assorted other systems, pieces and to many panels in the closet to not do more projects.
  • mike95490mike95490 Solar Expert Posts: 9,583 ✭✭✭✭✭
    You are starting to look at military temp specs.  commercial gear may survive but not be accurate

    That would prompt me to look into using hi-rel zeners and schottky devices to protect batteries from overcharge if this is just a winter storage situation.
    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

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  • mcgivormcgivor Solar Expert Posts: 3,854 ✭✭✭✭✭✭
    Really cheap controllers probably won't spec an operating temperature range, Morningstar spec -40°F to 113°F,  Midnight is another -40°F to 120°F  they both  have an good reputation and excellent customer support, there may be others.
    1500W, 6× Schutten 250W Poly panels , Schneider MPPT 60 150 CC, Schneider SW 2524 inverter, 400Ah LFP 24V nominal battery with Battery Bodyguard BMS 
    Second system 1890W  3 × 300W No name brand poly, 3×330 Sunsolar Poly panels, Morningstar TS 60 PWM controller, no name 2000W inverter 400Ah LFP 24V nominal battery with Daly BMS, used for water pumping and day time air conditioning.  
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  • EstragonEstragon Registered Users Posts: 4,496 ✭✭✭✭✭
    I've found LCD screens sorta work in the cold, but are really slow to change.  Patience is needed if you need to navigate a menu.  Plastic, metal, wiring, etc gets quite brittle in such low temps, so a light touch is also needed.  

    Fingers don't work too well for long either.  IMHO, a remote meter/control is worth the $$ :wink:
    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
  • KhellSkKhellSk Registered Users Posts: 82 ✭✭
    okay thanks guys. I am now rethinking my whole setup
    [2x Flooded  6v 210ah][12v 30a 400wMax CC]
    [5x 48w 15.9Vmp + 1x 100w 17Vmp]

  • KhellSkKhellSk Registered Users Posts: 82 ✭✭
    Signature test
    [2x Flooded  6v 210ah][12v 30a 400wMax CC]
    [5x 48w 15.9Vmp + 1x 100w 17Vmp]

  • BB.BB. Super Moderators, Administrators Posts: 33,082 admin
    You will not see a signature on mobile device mode.

    Near San Francisco California: 3.5kWatt Grid Tied Solar power system+small backup genset
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