505 W TOPCon solar panel with 108 cells. Voc 39.99 V · Isc 16.02 A · TcVoc -0.25%/°C.
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Voc
39.99 V
Vmpp
33.32 V
Isc
16.02 A
Impp
15.16 A
TcVoc
-0.25 %/°C
TcPmax
-0.29 %/°C
Pmax
505 W
Cells
108
Bifaciality
80%
Length
1975 mm
Width
1140 mm
Thickness
30 mm
Weight
24 kg
The Ulica Solar UL-505M-108DDGN-FLOW is a 505 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 |
|---|---|---|---|
| 480 W | 39.17 V | 15.72 A | |
| 485 W | 39.34 V | 15.78 A | |
| 490 W | 39.5 V | 15.84 A | |
| 495 W | 39.67 V | 15.9 A | |
| 500 W | 39.83 V | 15.96 A |
The most critical specs to match are: cell count (must be exactly 108), Voc close to 39.99 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 Ulica Solar UL-505M-108DDGN-FLOW.