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15Wp panel to battery without controller

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  • #16
    Originally posted by kdaddy1980 View Post
    what about this scenario..youre off grid.its cloudy all day and your batteries are low. Your one 12v /25 watt panel usually produces 22v more or less, its cloudy and only producing 15v all day. Can you safely hook up that one panel directly just to get your battery bank charged up fully?
    I think the answer would be that if you can monitor the voltage at the terminals and terminate it before overcharging it is safe, even if the panel is receiving good sunlight. Since I haven't done it, let's call that a guess. I think the problem with your question is that you didn't say what size/type battery you were charging.


    • #17
      say you have 16 25w panels (400w/28a) and twelve 73ah lead acid batteries.could you hook them all or a portion of them directly to achieve a "quick charge" on a cloudy day?


      • #18
        What is up with the repeated 'cloudy day' proviso? How do you feel that impacts the question? Once answered, will you ask again about sunny days?


        • #19
          There is no "quick charge" on cloudy days. your 400w of panels would produce 40w.
          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