645 W TOPCon solar panel with 120 cells. Voc 43.9 V · Isc 18.56 A · TcVoc -0.25%/°C.
Select the panel you want to replace
Panel not in the catalogue?
22 of the 4,444 panels in the catalogue can replace Canadian Solar CS7L-645TB-AG. 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 % · 8 models
Noticeable differences — the string voltage and current need a careful check.
Match 60–79 % · 10 models
Large differences — a real risk of a mismatched string; prefer a closer panel.
Match 27–59 % · 4 models
String Compatibility Calculator
Verify the replacement panel works with your inverter
Panel Matcher
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Find an inverter that fits your panel array with the right MPPT range and DC/AC ratio.
How the Algorithm Works
Learn how panels are scored and matched
Voc
43.9 V
Vmpp
36.7 V
Isc
18.56 A
Impp
17.58 A
TcVoc
-0.25 %/°C
TcPmax
-0.29 %/°C
Pmax
645 W
Cells
120
Bifaciality
80%
Length
2172 mm
Width
1303 mm
Thickness
33 mm
Weight
34.5 kg
The Canadian Solar CS7L-645TB-AG is a 645 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 |
|---|---|---|---|
| CS7L-615TB-AG | 615 W | 42.7 V | 18.26 A |
| CS7L-620TB-AG | 620 W | 42.9 V | 18.31 A |
| CS7L-625TB-AG | 625 W | 43.1 V | 18.36 A |
| CS7L-630TB-AG | 630 W | 43.3 V | 18.41 A |
| CS7L-635TB-AG | 635 W | 43.5 V | 18.46 A |
| CS7L-640TB-AG | 640 W | 43.7 V | 18.51 A |
The most critical specs to match are: cell count (must be exactly 120), Voc close to 43.9 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 Canadian Solar CS7L-645TB-AG.