640 W TOPCon solar panel with 132 cells. Voc 50.35 V · Isc 16.15 A · TcVoc -0.26%/°C.
Select the panel you want to replace
Panel not in the catalogue?
157 of the 4,444 panels in the catalogue can replace AXITEC AC-640TGB/132WS. 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 80–91 % · 11 models
Noticeable differences — the string voltage and current need a careful check.
Match 60–78 % · 60 models
Large differences — a real risk of a mismatched string; prefer a closer panel.
Match 34–59 % · 86 models
String Compatibility Calculator
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Panel Matcher
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How the Algorithm Works
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Voc
50.35 V
Vmpp
41.84 V
Isc
16.15 A
Impp
15.3 A
TcVoc
-0.26 %/°C
TcPmax
-0.31 %/°C
Pmax
640 W
Cells
132
Bifaciality
80%
Length
2382 mm
Width
1134 mm
Thickness
30 mm
Weight
32.5 kg
The AXITEC AC-640TGB/132WS is a 640 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 |
|---|---|---|---|
| AC-625TGB/132TWS | 625 W | 49.63 V | 16 A |
| AC-630TGB/132WS | 630 W | 49.87 V | 16.05 A |
| AC-635TGB/132WS | 635 W | 50.11 V | 16.1 A |
The most critical specs to match are: cell count (must be exactly 132), Voc close to 50.35 V (within ±5%), and temperature coefficient TcVoc close to -0.26%/°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 AXITEC AC-640TGB/132WS.