IQ8 PV Module Rating Larger Than Inverter Rating

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4
Module Degradtion over 25 Years
360W345W330W300W 315W
525W510W495W465W 480W
375W 390W 405W 420W
600W
435W 450W
570W 585W540W 555W
550
600
500
450
400
350
300
250
200
150
100
50
0
Y1
Y5
Y10
Y15
Y20
Y25
300W
315W
330W
345W
360W
375W
390W
405W
420W
435W
450W
465W
480W
495W
510W
525W
540W
555W
570W
585W
600W
300
290
285
279
274
268
315
305
299
293
287
282
330
320
313
307
301
295
345
334
327
321
321
308
360
349
342
335
328
322
375
363
356
349
342
335
390
378
370
363
356
349
405
392
384
377
369
362
420
407
399
391
383
375
435
421
413
405
397
389
450
436
427
419
410
402
465
450
441
433
424
416
480
465
456
447
438
429
495
479
470
460
451
442
510
494
484
474
465
456
525
508
498
488
479
469
540
523
513
502
492
483
555
537
527
516
506
496
570
552
541
530
520
509
585
566
555
544
533
523
600
581
569
558
547
536
Chart 1 – Module degradation over 25 years
2. Module’s deviation from STC
It’s important to understand that the module power ratings on their data sheets are based on DC power at STC.
However, modules do not operate at STC all the time because STC stands for Standard Test Conditions. In simpler
terms, STC stands for laboratory conditions and are specied by Irradiance at 1000W/m
2
, Temperature at 25° Celsius
and Pressure at 1 atmosphere. Any deviation from STC conditions means deviation from peak DC STC power. For
example, if the temperature exceeds 25°C(75°F), module output will drop because that relationship is inversely
correlated. Irradiance on the other hand, directly correlates to power and any drop from 1000W/m
2
will result in a
proportional drop in module DC power output. For example, a 450W DC STC module operating at 850W/m
2
, 35°C
and XX atmospheres, won’t produce 450W. This deviation from the datasheet value of Module is known as Module
deviation from STC. Module datasheets address this dierence by including two dierent values – STC and NOCT.
The magnitude of Module’s deviation from STC depends on the geographical location and how the system is installed.
The simulations done (see below sections) ensures to capture all the Geographical variations one can nd in US.