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Sunlight, power, day length, expected harvest = PV Watts

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  • Sunlight, power, day length, expected harvest = PV Watts

    After you've established what your load is, here is where to look for size of array needed to power it.

    PVWatts can take your location, panel aim & tilt, and tell you how much, on average, to expect from it.

    for grid tie, the numbers are pretty close. For battery/off grid, you may need almost 2x the PV array to account for losses in battery charging.
    Since the dawn of time it has been mankind's dream to blot out the sun.
    Montgomery Burns

    "Always listen to experts. They'll tell you what can't be done and why. Then do it."

    spreadsheet based voltage drop calculator:

    gen: ,
    battery lugs
    Setting up batteries

    gear :
    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