Help sizing this inverter : What is the optimal and max configuration size PV for this inverter:

Chan
Chan Registered Users Posts: 45 ✭✭
in Solar Beginners Corner #1
SOLAR PANEL SPECS:

250W
VMP: 30.92
IMP : 8.07
VOC: 37.92
ISC : 8.62

INVERTER SPECS IN PIC.


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  • Raj174
    Raj174 Solar Expert Posts: 795 ✭✭✭✭
    edited November 2016 #2
    1, 2, or 3 strings of 2 panels wired in series for 500, 1000, or 1500 watts respectively. All optimal, 1500 max.
    4480W PV, MNE175DR-TR, MN Classic 150, Outback Radian GS4048A, Mate3, 51.2V 360AH nominal LiFePO4, Kohler Pro 5.2E genset.
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  • Chan
    Chan Registered Users Posts: 45 ✭✭
    edited November 2016 #3
    wouldnt my VOC 37.92 exceed the MAX SOLAR VOLTAGE if I series my panel?

    This inverter is a bit bad, since its rated at 2400w but cant accept a pv of 2400w...  this unit will have a hard time charging a
    1x - 24v 200AH battery...
    let alone... a
    2x - 24v 200AH battery

    :(
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  • mike95490
    mike95490 Solar Expert Posts: 9,583 ✭✭✭✭✭
    #4
    Be aware this inverter REQUIRES a 24V battery bank.

    AND, that 2 panels in series will be very close to the "Device Burns Up" voltage of 75V, and the first cold morning will likely fry it,
    That's the Voc #   
    Charger = 75V
    Panel = 37.92v   x 2(in series) = 75.84v   Boom !

    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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  • Chan
    Chan Registered Users Posts: 45 ✭✭
    #5
    We live in the Philippines, so I think there is no cold morning.
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  • mike95490
    mike95490 Solar Expert Posts: 9,583 ✭✭✭✭✭
    #6
    Chan said:
    We live in the Philippines, so I think there is no cold morning.
    75.84v @ 70F.  If you have a morning below 75F, you exceed the voltage limit of the charger.  As temps go up, the voltage goes lower. At 90F you won't have a problem
    But with the average low in winter being 73F, you are close to exceeding the limits. Only takes a few minutes and it's fried.

    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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  • Chan
    Chan Registered Users Posts: 45 ✭✭
    #7
    would the 75.84 reach even in the early morning?

    The sun isnt even shining directly at the panel?
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  • Photowhit
    Photowhit Solar Expert Posts: 6,006 ✭✭✭✭✭
    #8
    I would not recommend using those panels with that charger/inverter.

    Your panels are unlikely to produce 30 volts when hot as singles and in pairs the VOC would be too high. They set the upper limit to protect sensitive electronics. The panels will produce the higher voltage even without direct sunlight.

    If you can give us the exact brand of panels we could look for Normal Operating Cell Temperature (NOCT) values for you.

    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 backup...lol), 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.
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