540 W TOPCon solar panel with 120 cells. Voc 44.33 V · Isc 15.36 A · TcVoc -0.25%/°C.
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String Compatibility Calculator
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How the Algorithm Works
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Voc
44.33 V
Vmpp
37.25 V
Isc
15.36 A
Impp
14.5 A
TcVoc
-0.25 %/°C
TcPmax
-0.29 %/°C
Pmax
540 W
Cells
120
Bifaciality
80%
Length
2063 mm
Width
1134 mm
Thickness
30 mm
Weight
28.8 kg
The JA Solar JAM60D42-540/LB is a 540 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 |
|---|---|---|---|
| 515 W | 43.33 V | 15.11 A | |
| 520 W | 43.53 V | 15.16 A | |
| 525 W | 43.73 V | 15.21 A | |
| 530 W | 43.93 V | 15.26 A | |
| 535 W | 44.13 V | 15.31 A |
The most critical specs to match are: cell count (must be exactly 120), Voc close to 44.33 V (within ±5%), and temperature coefficient TcVoc close to -0.25%/°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 JA Solar JAM60D42-540/LB.