wiring 8kw array to 5kw Mppsolar inverter 48v

kakarotkakarot Registered Users Posts: 16 ✭✭

What is the best way to wire 8 mono ( 500 watts each)



Panel specs:

8 x 500 watts. I purchased 10 but 2 broke on the way :(


Here are the specs from the back of the panels.

pm 500w

vmp 48.63v

Imp 10.28A

Voc 59.01v

Isc 10.87A

Maximum system voltage 1000v

Maximum series fuse rating 20A



I need to wire them to my inverter/charger

http://www.mppsolar.com/v3/catalogs/PIP-MS_MG.pdf


Max AMP is 80A

Max voltage is 450v

I'm not sure if I should wire  the 8x 500 watts panels in series or parallel

All 8 in series = 472.08V ( inverter limit 450v)

All 8 in parallel= 86.96 Amp ( inverter limit 80A)


Mix parallel and series option

6 in series and two in parallel = 354.06 v at 21.74A

4 in series and 4 in parallel =   236V  at  43.48A

2 in series and 6 parallel= 118.02v at 65.22A



battery setup is 12 x 110amp in 3 banks  of 48v config

330A at 48v

What is the best way to wire the panels?

Any tips would help.







Comments

  • mike95490mike95490 Solar Expert Posts: 8,652 ✭✭✭✭✭
    Any panels wired in series, need to be aimed at the same angle at the sun.  

    If you put 4 in series and aimed SE, and paralleled with the other 4 in series aimed SW, you just might improve the harvest over all due south.
    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 ,

  • kakarotkakarot Registered Users Posts: 16 ✭✭
    I'm in the tropics so it doesn't really matter. I have them flat and get 10-12 hrs of sunlight
  • mike95490mike95490 Solar Expert Posts: 8,652 ✭✭✭✭✭
    kakarot said:
    I'm in the tropics so it doesn't really matter. I have them flat and get 10-12 hrs of sunlight
    And you will only get 6 or 7 hours of harvest.  When the sun is at a low angle, a lot of power is not harvestable.
    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 ,

  • PhotowhitPhotowhit Solar Expert Posts: 5,134 ✭✭✭✭
    A few things, First 8 - 500 watt panels makes an array of 4000 watts.
    I've been helping someone on another forum with this inverter/charger/ all in one thing. It has one input for solar, so you will need to present 1 voltage. It has an input voltage range of 120-450 volts;



    So the only way to use all 8 panels is in 2 strings of 4 panels each. I doubt in the tropics if they will ever come close to 80 amps output. Likely closer to 65. Look for your solar panels NOCT value in the manual.

    Home system 4000 watt (Evergreen) array standing, with 2 Midnite Classic Lites,  Midnite E-panel, Prosine 1800 and Exeltech 1100, 660 ah 24v ForkLift battery. Off grid for @16 of last 17 years. Assorted other systems, and to many panels in the closet to not do more...lol
  • PhotowhitPhotowhit Solar Expert Posts: 5,134 ✭✭✭✭
    edited March 3 #6
    Sorry, I thought you had a link to the manual, I still had it open from helping the other guy. Here's a link to the manual where I got the info;

    http://www.mppsolar.com/manual/PIP-MG%20(PF1.0)/PIP-MG%205KVA%20manual-20190717.pdf

    Home system 4000 watt (Evergreen) array standing, with 2 Midnite Classic Lites,  Midnite E-panel, Prosine 1800 and Exeltech 1100, 660 ah 24v ForkLift battery. Off grid for @16 of last 17 years. Assorted other systems, and to many panels in the closet to not do more...lol
  • Raj174Raj174 Solar Expert Posts: 733 ✭✭✭✭
    edited March 3 #7
    @kakarot
    This inverter looks like it has only one charge controller. I agree with Photowhit and would recommend wiring 2 series strings of 4 panels in parallel. The strings can be paralleled at a combiner box using two 300volt 20amp fuses or breakers. If you are within about 10 degrees of the equator, then a virtual array of 4 series panels east and 4 series panels west should work well. I agree with Mike, a flat array will not be optimal. I would suggest about a 35 degree angle on the panels.
    3600W PV, MNE175DR-TR, MN Classic 150, Outback Radian GS4048A, Mate3, 54.4V 195AH LiFePO4 no BMS, Kohler Pro 5.2E.
  • kakarotkakarot Registered Users Posts: 16 ✭✭



    Max PV input VOC  is 145V for the MS 5000w model.
    Each panel is: Voc 59.01v

    Raj174 said:
    @kakarot
    This inverter looks like it has only one charge controller. I agree with Photowhit and would recommend wiring 2 series strings of 4 panels in parallel. The strings can be paralleled at a combiner box using two 300volt 20amp fuses or breakers. If you are within about 10 degrees of the equator, then a virtual array of 4 series panels east and 4 series panels west should work well. I agree with Mike, a flat array will not be optimal. I would suggest about a 35 degree angle on the panels.
    "2 series strings of 4 panels in parallel"


    I've tried to make two groups of 4. then wire them in parallel with two solar extension cord to the inverter  ++, -- terminal but the voltage is too high,  stops working.

    Now I have one group with 3 panels, and another group with 2 panels.  generating about 1.3kw

    Newbie question, Do i need to change the connectors in order to wire ++ and --  to keep the voltage lower?

    I'm doing this without a combiner box



    ANYONE WITH A CLEAR DIAGRAM please.







  • Raj174Raj174 Solar Expert Posts: 733 ✭✭✭✭
    edited March 18 #9
    If that is the case, then 2 in series by 4 in parallel should work well. All wiring shown should be #10 AWG or larger. Panels are wired positive to negative. Here's a rough drawing. It may be hard to get, but a combiner box would make this much easier and safer.




    3600W PV, MNE175DR-TR, MN Classic 150, Outback Radian GS4048A, Mate3, 54.4V 195AH LiFePO4 no BMS, Kohler Pro 5.2E.
  • burnin_daylightburnin_daylight Registered Users Posts: 4
    Looks like it was assumed you had the “MG” model, but must in fact have the “MS” model. According to their datasheet, max PV input voltage is 115V, which is kind of an odd max. If the max input really is 115V, you can’t series at all. Your panel VOC is 59V, so 2X in series puts you at 118V. Take into account cold temp coefficient, and you could be quite higher. 

    If the max PV input is actually 145V as you say, the diagram from @Raj174 will work perfectly. 
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