Determine what I need to run a system

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Theodore
Theodore Registered Users Posts: 1 ✭
in Solar Beginners Corner #1
Hello all,

I am running a communications tower that draws 8.0 Ah, I have 6, 160 Wp solar panels, 2 X 24-volt batteries (4 x 12V 200Ah batteries, deep cycle ) I am sure this is not enough to keep up with the charging of the batteries and running the system during a sunny day.

any advice would be appreciated.

Regards
Theodore.
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  • mike95490
    mike95490 Solar Expert Posts: 9,583 ✭✭✭✭✭
    #2
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    Load  8a @ 24v = 192wh x 24h = 4608wh  per day
    Soar   160w x .7 = 112w expected x 4 hours = 448wh x 6panels = 2688wh harvest on sunny day  (92ah @29v)
    battery 2400wh ea x 4 = 9600wh total, 4800wh usable (50% discharge)

    Nope, I think you need 2x the solar panels split into E & West arrays to charge batteries slowly over 4 hours, not boil them in 2hours

    In the end, I think going to 48V with more battery is needed, 1 cloudy day and you are dead






    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 ,

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  • Estragon
    Estragon Registered Users Posts: 4,496 ✭✭✭✭✭
    #3
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    Just to clarify, you said "draws 8 Ah". Is that an 8a load drawn 24hrs/day, or 8ah total energy used in a day? The former (8a) is a rate of use, the latter (8ah) is total used (like mph vs distance travelled).

    Assuming it should read "draws 8a", I'd agree with @mike95490 - more panel needed to charge and support load.
    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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