Jinko 625 W Solar Panel: 66HL4M vs 78HL4, the Same Power Built Two Ways
Search for a Jinko 625 W panel and the catalogue answers with more than one module. Two of them reach the same rated power by different routes: the JKM625N-66HL4M-BDV-F6 with 132 cells (66×2) and the JKM625N-78HL4-BDV-F10 with 156 cells (78×2). They are the same width and nearly the same weight, and an installer who orders the wrong one finds out at the inverter, because the voltage and the current of the two are far apart. This page reads both records so that the datasheet you open is the one for the panel you mean.
Specifications side by side
Every figure in this table is read from the product’s own record — the same rows each product page shows.
| Specification | Jinko N-Type Bifacial Solar Panel 625 W (66HL4M-BDV-F6) | Jinko N-Type Bifacial Solar Panel 625 W (78HL4-BDV-F10) |
|---|---|---|
| Maximum Power (Pmax) | 625 W | 625 W |
| Module Efficiency | 23.14 % | 22.36 % |
| Open Circuit Voltage (Voc) | 49.28 V | 56.95 V |
| Voltage at Maximum Power (Vmpp) | 40.88 V | 47.54 V |
| Current at Maximum Power (Impp) | 15.29 A | 13.15 A |
| Short Circuit Current (Isc) | 16.14 A | 13.8 A |
| Cell Technology | N-type Mono-crystalline | N- type Mono-crystalline |
| Power Output Tolerance | 0 ~ 3 % | 0 ~ 3 % |
| Maximum Series Fuse Rating | 35 A | 30 A |
| Bifaciality | 98 % | 98 % |
| Temperature Coefficient of Voc | -0.25 % | -0.25 % |
| Maximum System Voltage | 1500 V | 1500 V |
| Number of Cells | 132 | 156 |
| Dimensions (W×H×D) | 2382×1134×30 mm | 2465×1134×30 mm |
| Weight | 32.4 kg | 34 kg |
| Front Glass | 2.0 mm, Anti-reflection Coating | 2.0 mm, Anti-reflection Coating |
| Back Glass | 2.0 mm, Heat Strengthened Glass | 2.0 mm, Heat Strengthened Glass |
| Frame Material | Anodized Aluminium Alloy | Anodized Aluminium Alloy |
| Junction Box | IP68 Rated | IP68 Rated |
| Connector Type | JK03M/MC4/Others* | JK03M/MC4/Others |
| Operating Temperature | -40 ~ 70 °C | -40 ~ 70 °C |
| Pallet Dimensions | 2396X1110×1251 mm | 2525×1140×1251mm |
| Packing Detail | 36 pcs/pallets, 72 pcs/stack, | 36 pcs/pallets, 72 pcs/stack, |
| Protection Class | Class II | Class II |
| Fire Rating | Class C | Class C |
| Warranty | 12 Years Product, 30 Years Performance | 12 Years Product, 30 Years Performance |
| Price | AED 388 | AED 388 |
Same power, different efficiency
The 66HL4M-BDV-F6 is rated 625 W at a module efficiency of 23.14 %. The 78HL4-BDV-F10 is rated 625 W at a module efficiency of 22.36 %. Both records give a power tolerance of 0 to +3 %. The 78HL4 needs a longer frame to reach the same power, which is what the lower efficiency figure means in practice.
Size and weight
The 66HL4M-BDV-F6 has 132 cells (66×2) in a 2382×1134×30 mm frame and weighs 32.4 kg. The 78HL4-BDV-F10 has 156 cells (78×2) in a 2465×1134×30 mm frame and weighs 34.0 kg. The width and the frame depth are shared, so the two sit on the same rail spacing; the 78HL4 is the longer panel. Both records pack 36 panels to a pallet, with 2.0 mm front and 2.0 mm back glass.
Voltage and current: the real difference
The 66HL4M-BDV-F6 has a Voc of 49.28 V and a Vmpp of 40.88 V, with an Impp of 15.29 A and an Isc of 16.14 A; its record states a 35 A maximum series fuse rating. The 78HL4-BDV-F10 has a Voc of 56.95 V and a Vmpp of 47.54 V, with an Impp of 13.15 A and an Isc of 13.80 A; its record states a 30 A maximum series fuse rating. Under the same 1500 V system limit the 78HL4 reaches the ceiling with fewer panels per string, and it draws less current from each input.
Which one for which inverter and site
An inverter whose MPPT inputs are limited in current is the natural match for the 78HL4-BDV-F10, the lower-current of the two. A site where table length or roof length is fixed, or where long strings keep cabling down, suits the 66HL4M-BDV-F6, which is shorter and lower in voltage. Both records state bifaciality coefficients of 98±5 % for Voc and 80±5 % for Isc and Pmax, an IP68 junction box and an operating range of -40 to +70 °C, so those rows do not decide it.
Warranty and price
The 66HL4M-BDV-F6 record states 12 years of product warranty and 30 years of performance warranty, and the 78HL4-BDV-F10 record states 12 years of product warranty and 30 years of performance warranty. Both are 625 W at USD 0.169 per watt of rated power, so the two cost the same.
The models in this comparison
Winner
The 66HL4M-BDV-F6 where length is limited or longer strings are wanted; the 78HL4-BDV-F10 where the inverter's input current is the tighter limit.
Conclusion
Same watts, same width, same price, same warranty, and a different electrical character. The 66HL4M-BDV-F6 is the shorter, more efficient, higher-current module. The 78HL4-BDV-F10 is the longer, higher-voltage, lower-current module. Pick the one whose voltage and current fit the inverter and the string layout already drawn, and never mix the two in one string: their currents do not match.