645 W PERC solar panel with 414 cells. Voc 46.6 V · Isc 17.74 A · TcVoc -0.27%/°C.
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4 panels found · 3696 panels excluded
650 W
PERC| Parameter | Original | Replacement | Deviation |
|---|---|---|---|
| Voc | 46.6 V | 46.7 V | 0.2% |
| Vmpp | 38.7 V | 38.8 V | 0.3% |
| Isc | 17.74 A | 17.84 A | 0.6% |
| Impp | 16.68 A | 16.77 A | 0.5% |
| TcVoc | -0.27 %/°C | -0.27 %/°C | ±0.000 %/°C |
| TcPmax | -0.34 %/°C | -0.34 %/°C | ±0.000 %/°C |
655 W
PERC| Parameter | Original | Replacement | Deviation |
|---|---|---|---|
| Voc | 46.6 V | 46.8 V | 0.4% |
| Vmpp | 38.7 V | 38.8 V | 0.3% |
| Isc | 17.74 A | 17.97 A | 1.3% |
| Impp | 16.68 A | 16.89 A | 1.3% |
| TcVoc | -0.27 %/°C | -0.27 %/°C | ±0.000 %/°C |
| TcPmax | -0.34 %/°C | -0.34 %/°C | ±0.000 %/°C |
660 W
PERC| Parameter | Original | Replacement | Deviation |
|---|---|---|---|
| Voc | 46.6 V | 46.9 V | 0.6% |
| Vmpp | 38.7 V | 38.9 V | 0.5% |
| Isc | 17.74 A | 18.06 A | 1.8% |
| Impp | 16.68 A | 16.98 A | 1.8% |
| TcVoc | -0.27 %/°C | -0.27 %/°C | ±0.000 %/°C |
| TcPmax | -0.34 %/°C | -0.34 %/°C | ±0.000 %/°C |
665 W
PERC| Parameter | Original | Replacement | Deviation |
|---|---|---|---|
| Voc | 46.6 V | 47 V | 0.9% |
| Vmpp | 38.7 V | 39 V | 0.8% |
| Isc | 17.74 A | 18.16 A | 2.4% |
| Impp | 16.68 A | 17.07 A | 2.3% |
| TcVoc | -0.27 %/°C | -0.27 %/°C | ±0.000 %/°C |
| TcPmax | -0.34 %/°C | -0.34 %/°C | ±0.000 %/°C |
String Compatibility Calculator
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How the Algorithm Works
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Voc
46.6 V
Vmpp
38.7 V
Isc
17.74 A
Impp
16.68 A
TcVoc
-0.27 %/°C
TcPmax
-0.34 %/°C
Pmax
645 W
Cells
414
Bifaciality
70%
Length
2384 mm
Width
1303 mm
Thickness
35 mm
Weight
38.5 kg
The RECOM RCM-645-SDMT2 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 |
|---|---|---|---|
| 650 W | 46.7 V | 17.84 A | |
| 655 W | 46.8 V | 17.97 A | |
| 660 W | 46.9 V | 18.06 A | |
| 665 W | 47 V | 18.16 A | |
| 670 W | 47.1 V | 18.26 A | |
| 675 W | 47.2 V | 18.36 A |
The most critical specs to match are: cell count (must be exactly 414), Voc close to 46.6 V (within ±5%), and temperature coefficient TcVoc close to -0.27%/°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 RECOM RCM-645-SDMT2.