440 W PERC solar panel with 144 cells. Voc 49.6 V · Isc 11.34 A · TcVoc -0.29%/°C.
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String Compatibility Calculator
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How the Algorithm Works
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Voc
49.6 V
Vmpp
40.8 V
Isc
11.34 A
Impp
10.79 A
TcVoc
-0.29 %/°C
TcPmax
-0.34 %/°C
Pmax
440 W
Cells
144
Bifaciality
70%
Length
2094 mm
Width
1038 mm
Thickness
35 mm
Weight
26.1 kg
The Sunpro Power SPDG440-144M is a 440 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 |
|---|---|---|---|
| 435 W | 49.5 V | 11.23 A | |
| 445 W | 49.7 V | 11.45 A | |
| 450 W | 49.8 V | 11.56 A | |
| 455 W | 49.9 V | 11.65 A | |
| 460 W | 50 V | 11.69 A |
The most critical specs to match are: cell count (must be exactly 144), Voc close to 49.6 V (within ±5%), and temperature coefficient TcVoc close to -0.29%/°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 Sunpro Power SPDG440-144M.