645 W TOPCon solar panel with 156 cells. Voc 56.29 V · Isc 14.59 A · TcVoc -0.25%/°C.
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How the Algorithm Works
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Voc
56.29 V
Vmpp
46.24 V
Isc
14.59 A
Impp
13.95 A
TcVoc
-0.25 %/°C
TcPmax
-0.3 %/°C
Pmax
645 W
Cells
156
Bifaciality
80%
Length
2465 mm
Width
1134 mm
Thickness
35 mm
Weight
33.6 kg
The Sunpro Power SPDG645-N156M10 is a 645 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 |
|---|---|---|---|
| 630 W | 55.84 V | 14.38 A | |
| 635 W | 55.99 V | 14.45 A | |
| 640 W | 56.14 V | 14.52 A | |
| 650 W | 56.43 V | 14.66 A |
The most critical specs to match are: cell count (must be exactly 156), Voc close to 56.29 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 Sunpro Power SPDG645-N156M10.