420 W PERC solar panel with 144 cells. Voc 50.1 V · Isc 10.58 A · TcVoc -0.25%/°C.
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Panel not in the catalogue?
17 of the 4,444 panels in the catalogue can replace Trina Solar TSM-DE09R.08-420. 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 84–94 % · 4 models
Large differences — a real risk of a mismatched string; prefer a closer panel.
Match 29–53 % · 13 models
String Compatibility Calculator
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Panel Matcher
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How the Algorithm Works
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Voc
50.1 V
Vmpp
42 V
Isc
10.58 A
Impp
10.01 A
TcVoc
-0.25 %/°C
TcPmax
-0.34 %/°C
Pmax
420 W
Cells
144
Length
1762 mm
Width
1134 mm
Thickness
30 mm
Weight
21.8 kg
The Trina Solar TSM-DE09R.08-420 is a 420 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 |
|---|---|---|---|
| TSM-DE09R.08-415 | 415 W | 50 V | 10.55 A |
| TSM-DE09R.08-425 | 425 W | 50.2 V | 10.61 A |
| TSM-DE09R.08-430 | 430 W | 50.3 V | 10.64 A |
| TSM-DE09R.08-435 | 435 W | 50.4 V | 10.67 A |
The most critical specs to match are: cell count (must be exactly 144), Voc close to 50.1 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 Trina Solar TSM-DE09R.08-420.