enviromech2: Two strings on GT Inverter with different voltages

This discussion was created from comments split from: Two Strings in Parallel with Unequal String Voltages.

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  • enviromech2enviromech2 Registered Users Posts: 6 ✭✭
    two strings of different voltages
    my new array installed today which i havent paid for has two different voltages 15 volts different 12 panels per string 24 panels is that ok or normal i think thats outside manufacters tolerances help any ideas  
  • BB.BB. Super Moderators, Administrators Posts: 32,079 admin
    Envriomech2, I have made a thread/discussion for your questions. This will keep things focused on your needs.

    Can you tell us a bit more about your system? What GT inverter, what Vmp/Imp solar panels you have, etc.?

    -Bill
    Near San Francisco California: 3.5kWatt Grid Tied Solar power system+small backup genset
  • enviromech2enviromech2 Registered Users Posts: 6 ✭✭
    thanks in australia 24 panels canadian solar 270 watt  inverter sunny tripower sma three phase dual mppt input 
    roof shallow pitch north face no shade 30 to 40 degrees celcius thats hot in farenheight
    just fittted by company not grid tied yet thats today 
    15 volts diference on sma screen betweeen the two srtings
    company says as one string was on roof for 4 hours and second string only two hours string one heated up more which reduced output 
    this is possable as cooling panels in hot climates can give a lot more power ive done it years ago cant remember figure but was maybe 10to 20% built my first pv system in 1984 
    mr chan says heat max accounts for 4%
    panel manufacters spec is 5 w over 270 watt
    during install no commisioning was done on each panel
    and as comissioning says go home come back next day when full sun fresh minds and clear heads
    appriciate your thoughts
    thankyou ric downunder  
  • enviromech2enviromech2 Registered Users Posts: 6 ✭✭
    fixed!
    even voltages
    panels that wake up in the sun together lose efficiencey due to heat build up at the same rate
    panels still in the box for two hours longer ie cooler work better till they heat up
    the company guru was correct although the installer had not seen before
    the usa solar panel commisioning hand book while doesnt allude to this phernomon is still very wise and a good short read
    thankyou for this forum
    collected 27k from 12pm on ie half a day
    i think i may have a bit more western orrientation happening
    as we have the honor of the dearest power in the country and third highest world wide soon well be number one!
    looking at home battery now
    hoping goverment will subsdise home micro power station  battey packs allowing home owners to feed back into own failing grid system
    which is damaged beyound repair by the greenies
    the govt subed 1000 tesla 1 walls in june last year
    grid is at crisis point now and much disscusion happening
    yours ric downunder  
    now were,s my model s lol
     
  • bill von novakbill von novak Solar Expert Posts: 891 ✭✭✭✭
    as we have the honor of the dearest power in the country and third highest world wide soon well be number one!
    looking at home battery now
    hoping goverment will subsdise home micro power station  battey packs allowing home owners to feed back into own failing grid system
    which is damaged beyound repair by the greenies
     
    Keep in mind that to 99.99% of the people in the world, you are one of the greenies.
  • enviromech2enviromech2 Registered Users Posts: 6 ✭✭
    lol i know warm fuzzies to all 
    but i think before stamping out the brown coal fire that runs thier soy latie machine they should have at least checked  if an alternative was running 
    deep pressure water storage looks interesting storage idea
    ta ric
  • mike95490mike95490 Solar Expert Posts: 9,392 ✭✭✭✭✭
    "deep pressure water storage"   is what ?   Water cannot be pressurized like air, it does not compress.  You build pressure from the weight of the water column height.
    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 ,

  • enviromech2enviromech2 Registered Users Posts: 6 ✭✭
    concrete vessels on sea bed water removedwith pumps at times of cheap power then refillled trough turbines when power is needed scotland maybe harsh enviroment
  • enviromech2enviromech2 Registered Users Posts: 6 ✭✭
    its going to be ok Elons offered us 100 mgwh in 100 days or its free 
    go elon
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