645 W TOPCon solar panel with 120 cells. Voc 44.05 V · Isc 18.45 A · TcVoc -0.25%/°C.
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3 panels found · 3707 panels excluded
650 W
TOPCon| Parameter | Original | Replacement | Deviation |
|---|---|---|---|
| Voc | 44.05 V | 44.28 V | 0.5% |
| Vmpp | 37.09 V | 37.3 V | 0.6% |
| Isc | 18.45 A | 18.48 A | 0.2% |
| Impp | 17.39 A | 17.43 A | 0.2% |
| TcVoc | -0.25 %/°C | -0.25 %/°C | ±0.000 %/°C |
| TcPmax | -0.29 %/°C | -0.29 %/°C | ±0.000 %/°C |
655 W
TOPCon| Parameter | Original | Replacement | Deviation |
|---|---|---|---|
| Voc | 44.05 V | 44.52 V | 1.1% |
| Vmpp | 37.09 V | 37.5 V | 1.1% |
| Isc | 18.45 A | 18.51 A | 0.3% |
| Impp | 17.39 A | 17.47 A | 0.5% |
| TcVoc | -0.25 %/°C | -0.25 %/°C | ±0.000 %/°C |
| TcPmax | -0.29 %/°C | -0.29 %/°C | ±0.000 %/°C |
660 W
TOPCon| Parameter | Original | Replacement | Deviation |
|---|---|---|---|
| Voc | 44.05 V | 44.75 V | 1.6% |
| Vmpp | 37.09 V | 37.7 V | 1.6% |
| Isc | 18.45 A | 18.54 A | 0.5% |
| Impp | 17.39 A | 17.51 A | 0.7% |
| TcVoc | -0.25 %/°C | -0.25 %/°C | ±0.000 %/°C |
| TcPmax | -0.29 %/°C | -0.29 %/°C | ±0.000 %/°C |
String Compatibility Calculator
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Voc
44.05 V
Vmpp
37.09 V
Isc
18.45 A
Impp
17.39 A
TcVoc
-0.25 %/°C
TcPmax
-0.29 %/°C
Pmax
645 W
Cells
120
Length
2172 mm
Width
1303 mm
Thickness
30 mm
Weight
36 kg
The Maysun Solar MS645MTDG-60HN 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 |
|---|---|---|---|
| MS650MTDG-60HN | 650 W | 44.28 V | 18.48 A |
| MS655MTDG-60HN | 655 W | 44.52 V | 18.51 A |
| MS660MTDG-60HN | 660 W | 44.75 V | 18.54 A |
The most critical specs to match are: cell count (must be exactly 120), Voc close to 44.05 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 Maysun Solar MS645MTDG-60HN.