425 W TOPCon solar panel with 108 cells. Voc 38.67 V · Isc 13.49 A · TcVoc -0.24%/°C.
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Panel not in the catalogue?
154 of the 4,444 panels in the catalogue can replace Qcells Q.TRON BLK M-G2+ 425 (405-425 W). Before you buy, check your pick in the string calculator with your inverter.
CloseNoticeableLarge differenceTap or click a difference to see what it means for your string.
Near-identical electrics — a drop-in swap for the same string.
Match 95 % · 1 model
Small differences within tolerance — safe once verified in the calculator with your inverter.
Match 80–91 % · 6 models
Noticeable differences — the string voltage and current need a careful check.
Match 60–77 % · 59 models
Large differences — a real risk of a mismatched string; prefer a closer panel.
Match 18–59 % · 88 models
String Compatibility Calculator
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Panel Matcher
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How the Algorithm Works
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Voc
38.67 V
Vmpp
32.98 V
Isc
13.49 A
Impp
12.88 A
TcVoc
-0.24 %/°C
TcPmax
-0.3 %/°C
Pmax
425 W
Cells
108
Length
1692 mm
Width
1134 mm
Thickness
32 mm
Weight
21.5 kg
The Qcells Q.TRON BLK M-G2+ 425 (405-425 W) is a 425 W solar panel. Finding a compatible replacement requires matching the original electrical characteristics — particularly Voc, Vmpp, Isc, and temperature coefficients — to ensure safe operation within the same string.
Use the form above to find panels that match these specifications. Then verify the replacement in the String Compatibility Calculator with your inverter.
| Model | Power | Voc | Isc |
|---|---|---|---|
| Q.TRON BLK M-G2+ 405 (405-425 W) | 405 W | 38.56 V | 13.35 A |
| Q.TRON BLK M-G2+ 410 (405-425 W) | 410 W | 38.58 V | 13.39 A |
| Q.TRON BLK M-G2+ 415 (405-425 W) | 415 W | 38.61 V | 13.42 A |
| Q.TRON BLK M-G2+ 420 (405-425 W) | 420 W | 38.64 V | 13.46 A |
The most critical specs to match are: cell count (must be exactly 108), Voc close to 38.67 V (within ±5%), and temperature coefficient TcVoc close to -0.24%/°C. If Voc differs significantly, the string voltage at extreme temperatures may shift outside the inverter's MPPT range. The replacement finder above pre-screens all candidates by these criteria.
A higher wattage panel usually has a higher Vmpp or Isc, which can affect string voltage and current. Small increases (up to 10–15%) are typically safe if the other electrical specs align. The replacement finder shows a compatibility score — 'Exact match' means the specs align closely. Always verify the replacement in the String Compatibility Calculator with your inverter before installation.
If the replacement has a significantly different Voc or Vmpp, the string voltage may shift outside the inverter's MPPT range, reducing energy production or causing faults. This effect is amplified at temperature extremes: at low temperatures, voltage rises by the TcVoc coefficient. The replacement finder automatically accounts for this — it scores candidates by how closely the electrical specs match the original Qcells Q.TRON BLK M-G2+ 425 (405-425 W).