660 W TOPCon solar panel with 132 cells. Voc 49 V · Isc 16.5 A · TcVoc -0.25%/°C.
Select the panel you want to replace
Panel not in the catalogue?
78 of the 4,444 panels in the catalogue can replace DAH Solar HE-DHN-66Z20/DG-FS(BW)-660W. 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.
Near-identical electrics — a drop-in swap for the same string.
Match 96 % · 1 model
Small differences within tolerance — safe once verified in the calculator with your inverter.
Match 80–91 % · 14 models
Noticeable differences — the string voltage and current need a careful check.
Match 60–79 % · 47 models
Large differences — a real risk of a mismatched string; prefer a closer panel.
Match 21–59 % · 16 models
String Compatibility Calculator
Verify the replacement panel works with your inverter
Panel Matcher
Find all compatible panels for a specific inverter
Already have panels?
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
49 V
Vmpp
41.9 V
Isc
16.5 A
Impp
15.75 A
TcVoc
-0.25 %/°C
TcPmax
-0.29 %/°C
Pmax
660 W
Cells
132
Bifaciality
80%
Length
2382 mm
Width
1134 mm
Thickness
28 mm
Weight
32.9 kg
The DAH Solar HE-DHN-66Z20/DG-FS(BW)-660W is a 660 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 |
|---|---|---|---|
| HE-DHN-66Z20/DG-FS(BW)-640W | 640 W | 48.6 V | 16.34 A |
| HE-DHN-66Z20/DG-FS(BW)-645W | 645 W | 48.7 V | 16.38 A |
| HE-DHN-66Z20/DG-FS(BW)-650W | 650 W | 48.8 V | 16.42 A |
| HE-DHN-66Z20/DG-FS(BW)-655W | 655 W | 48.9 V | 16.46 A |
The most critical specs to match are: cell count (must be exactly 132), Voc close to 49 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 DAH Solar HE-DHN-66Z20/DG-FS(BW)-660W.