540 W PERC solar panel with 132 cells. Voc 48.87 V · Isc 14.15 A · TcVoc -0.23%/°C.
Select the panel you want to replace
Voc
48.87 V
Vmpp
40.53 V
Isc
14.15 A
Impp
13.33 A
TcVoc
-0.23 %/°C
TcPmax
-0.29 %/°C
Pmax
540 W
Cells
132
The LONGi LR5-66HTH-540M is a 540 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 |
|---|---|---|---|
| 520 W | 48.27 V | 13.84 A | |
| 525 W | 48.42 V | 13.93 A | |
| 530 W | 48.57 V | 14 A | |
| 535 W | 48.72 V | 14.07 A |
The most critical specs to match are: cell count (must be exactly 132), Voc close to 48.87 V (within ±5%), and temperature coefficient TcVoc close to -0.23%/°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 LONGi LR5-66HTH-540M.