640 W HPBC solar panel with 144 cells. Voc 53.7 V · Isc 15.13 A · TcVoc -0.2%/°C.
Select the panel you want to replace
Panel not in the catalogue?
43 of the 4,444 panels in the catalogue can replace LONGi LGi7-72HVD-640M. 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 95–100 % · 6 models
Small differences within tolerance — safe once verified in the calculator with your inverter.
Match 81–91 % · 15 models
Noticeable differences — the string voltage and current need a careful check.
Match 60–78 % · 9 models
Large differences — a real risk of a mismatched string; prefer a closer panel.
Match 43–58 % · 13 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
53.7 V
Vmpp
44.36 V
Isc
15.13 A
Impp
14.43 A
TcVoc
-0.2 %/°C
TcPmax
-0.26 %/°C
Pmax
640 W
Cells
144
Length
2382 mm
Width
1134 mm
Thickness
30 mm
Weight
35.7 kg
The LONGi LGi7-72HVD-640M 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 |
|---|---|---|---|
| LGi7-72HVD-645M | 645 W | 53.8 V | 15.21 A |
| LGi7-72HVD-650M | 650 W | 53.9 V | 15.29 A |
| LGi7-72HVD-655M | 655 W | 54 V | 15.37 A |
| LGi7-72HVD-660M | 660 W | 54.1 V | 15.45 A |
| LGi7-72HVD-665M | 665 W | 54.2 V | 15.52 A |
| LGi7-72HVD-670M | 670 W | 54.3 V | 15.6 A |
The most critical specs to match are: cell count (must be exactly 144), Voc close to 53.7 V (within ±5%), and temperature coefficient TcVoc close to -0.2%/°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 LONGi LGi7-72HVD-640M.