320 W PERC solar panel with 60 cells. Voc 40.22 V · Isc 10.2 A · TcVoc -0.28%/°C.
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String Compatibility Calculator
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How the Algorithm Works
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Voc
40.22 V
Vmpp
33.61 V
Isc
10.2 A
Impp
9.52 A
TcVoc
-0.28 %/°C
TcPmax
-0.39 %/°C
Pmax
320 W
Cells
60
Length
1700 mm
Width
1000 mm
Thickness
35 mm
Weight
19 kg
The Sonnenstromfabrik EXCELLENT 320 M60 is a 320 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 |
|---|---|---|---|
| EXCELLENT 325 M60 | 325 W | 40.41 V | 10.31 A |
| EXCELLENT 330 M60 | 330 W | 40.6 V | 10.42 A |
The most critical specs to match are: cell count (must be exactly 60), Voc close to 40.22 V (within ±5%), and temperature coefficient TcVoc close to -0.28%/°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 Sonnenstromfabrik EXCELLENT 320 M60.