305 W PERC solar panel with 60 cells. Voc 39.49 V · Isc 9.86 A · TcVoc -0.318%/°C.
Select the panel you want to replace
Panel not in the catalogue?
7 of the 4,444 panels in the catalogue can replace Viessmann Vitovolt 300 M305 PA. Before you buy, check your pick in the string calculator with your inverter.
CloseNoticeableLarge differenceTap or click a difference to see what it means for your string.
Small differences within tolerance — safe once verified in the calculator with your inverter.
Match 83–91 % · 2 models
Large differences — a real risk of a mismatched string; prefer a closer panel.
Match 21–54 % · 5 models
String Compatibility Calculator
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Panel Matcher
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How the Algorithm Works
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Voc
39.49 V
Vmpp
32.35 V
Isc
9.86 A
Impp
9.43 A
TcVoc
-0.318 %/°C
TcPmax
-0.427 %/°C
Pmax
305 W
Cells
60
Length
1640 mm
Width
992 mm
Thickness
35 mm
Weight
18.5 kg
The Viessmann Vitovolt 300 M305 PA is a 305 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 |
|---|---|---|---|
| Vitovolt 300 M295 PA | 295 W | 39.27 V | 9.73 A |
| Vitovolt 300 M300 PA | 300 W | 39.39 V | 9.78 A |
The most critical specs to match are: cell count (must be exactly 60), Voc close to 39.49 V (within ±5%), and temperature coefficient TcVoc close to -0.318%/°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 Viessmann Vitovolt 300 M305 PA.