645 W TOPCon solar panel with 132 cells. Voc 49.98 V · Isc 16.39 A · TcVoc -0.24%/°C.
Select the panel you want to replace
Voc
49.98 V
Vmpp
41.96 V
Isc
16.39 A
Impp
15.37 A
TcVoc
-0.24 %/°C
TcPmax
-0.29 %/°C
Pmax
645 W
Cells
132
Bifaciality
80%
The Yingli Solar YL645CF66 i/2 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 |
|---|---|---|---|
| 620 W | 49.08 V | 16.04 A | |
| 625 W | 49.26 V | 16.11 A | |
| 630 W | 49.44 V | 16.18 A | |
| 635 W | 49.62 V | 16.25 A | |
| 640 W | 49.8 V | 16.32 A |
The most critical specs to match are: cell count (must be exactly 132), Voc close to 49.98 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 Yingli Solar YL645CF66 i/2.