Probably redundant question

adobedon
adobedon Registered Users Posts: 2 ✭
in Grid Tie and Grid Interactive Systems #1
Hi Guys,  Newbie here. My buddy does a lot of Solar panels and I have  picked up the bug.   Working with him we were testing some used 255watt microinverters in full AZ sun.  We both timed a lag in energy production at 5 minutes +-.  Ya'll already  know about this I presume but why is there such a lengthy lag in energy production?   I just finished reading your forum about the 'warming' of the panels produced by electron movement and 'short circuiting' of such etc.  He has mentioned this lag to me before and he explained  that the lag is inherent in the system.....but why?
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  • adobedon
    adobedon Registered Users Posts: 2 ✭
    #2
    Correction here.......The panels are 255 watts and the microinverter was 280 watts.
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  • Estragon
    Estragon Registered Users Posts: 4,496 ✭✭✭✭✭
    #3
    Just a guess, but that may be the timing of an mppt "sweep", during which the microinverter tries various voltage/current power points to find maximum power for the temperature and insolation conditions.

    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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  • mike95490
    mike95490 Solar Expert Posts: 9,583 ✭✭✭✭✭
    #4
    300 seconds are required to detect Grid Stability before selling
    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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  • BB.
    BB. Super Moderators, Administrators Posts: 33,637 admin
    #5
    Yep. As Mike typed, a 5 minute delay between Utility Power Good and generating power for GT type inverters... To protect the grid and linemen (linepersons?) from getting injured during power failures/repairs.

    Once the power has been "good" (within voltage specifications, and frequency specs), inverter(s) will turn on. Any "faults" before the GT inverter turns on, resets the timer back to zero.

    -Bill
    Near San Francisco California: 3.5kWatt Grid Tied Solar power system+small backup genset
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