400 W HJT solar panel with 132 cells. Voc 48.5 V · Isc 10.72 A · TcVoc -0.24%/°C.
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String Compatibility Calculator
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Voc
48.5 V
Vmpp
40.2 V
Isc
10.72 A
Impp
9.96 A
TcVoc
-0.24 %/°C
TcPmax
-0.24 %/°C
Pmax
400 W
Cells
132
Length
1865 mm
Width
1040 mm
Thickness
30 mm
Weight
21.7 kg
The REC Group REC400AA Pure 2 is a 400 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 |
|---|---|---|---|
| 410 W | 48.8 V | 10.77 A | |
| 420 W | 49.1 V | 10.83 A | |
| 430 W | 49.3 V | 10.88 A |
The most critical specs to match are: cell count (must be exactly 132), Voc close to 48.5 V (within ±5%), and temperature coefficient TcVoc close to -0.24%/°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 REC Group REC400AA Pure 2.