420 W PERC solar panel with 144 cells. Voc 49.01 V · Isc 11.04 A · TcVoc -0.285%/°C.
Select the panel you want to replace
Voc
49.01 V
Vmpp
40.61 V
Isc
11.04 A
Impp
10.35 A
TcVoc
-0.285 %/°C
TcPmax
-0.35 %/°C
Pmax
420 W
Cells
144
The Waaree Energies WSMD-420 is a 420 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 |
|---|---|---|---|
| 425 W | 49.19 V | 11.11 A | |
| 430 W | 49.39 V | 11.19 A | |
| 435 W | 49.59 V | 11.25 A | |
| 440 W | 49.69 V | 11.34 A | |
| 445 W | 49.89 V | 11.41 A | |
| 450 W | 50.1 V | 11.46 A | |
| 455 W | 50.3 V | 11.53 A |
The most critical specs to match are: cell count (must be exactly 144), Voc close to 49.01 V (within ±5%), and temperature coefficient TcVoc close to -0.285%/°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 Waaree Energies WSMD-420.