LONGi Hi-MO X10 Scientist vs Guardian: Two 650 W Panels, One Frame
Hi-MO X10 is the LONGi line buyers search by name, and it is listed in two builds: Scientist and Guardian. This page sets one of each side by side at the same rating — the Hi-MO X10 Scientist LR7-72HVD 650W and the Hi-MO X10 Guardian LR7-72HVDF 650W — and reads every figure from the two product records. On paper the two are close to twins: the same 650 W, the same 24.1% module efficiency, the same 2382×1134×30 mm frame size and the same 33.5 kg. What separates them is the operating point each record states and what each build is made for. The Scientist record speaks of peak efficiency and high-temperature roofs; the Guardian record speaks of a frame design that reduces dust accumulation and of reliability under harsh conditions.
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 | LONGi Hi-MO X10 Scientist LR7-72HVD 650W | LONGi Hi-MO X10 Guardian LR7-72HVDF 650W |
|---|---|---|
| Maximum Power (Pmax) | 650 W | 650 W |
| Open Circuit Voltage (Voc) | 54.22 V | 54.23 V |
| Module Efficiency | 24.1 % | 24.1 % |
| Temperature Coefficient of Pmax | -0.26 % | -0.26 % |
| Short Circuit Current (Isc) | 15.12 A | 15.06 A |
| Voltage at Maximum Power (Vmpp) | 46.67 V | 44.87 V |
| Current at Maximum Power (Impp) | 14.41 A | 14.55 A |
| Temperature Coefficient of Isc | 0.05 % | 0.05 % |
| Temperature Coefficient of Voc | -0.2 % | -0.2 % |
| Power Output Tolerance | 0 ~ 3 % | 0 ~ 3 % |
| Maximum System Voltage | 1500 V | 1500 V |
| Maximum Series Fuse Rating | 30 A | 30 A |
| Nominal Operating Cell Temperature (NOCT) | 45 °C | 45 °C |
| Bifaciality | 70 % | 70 % |
| Dimensions (W×H×D) | 2382×1134×30 mm | 2382×1134×30 mm |
| Weight | 33.5 kg | 33.5 kg |
| Frame Material | Anodized aluminum alloy frame | Anodized aluminum alloy frame |
| Glass | Dual glass, 2.0mm semi-tempered glass | Double glass, 2.0mm semi-tempered glass |
| Front Side Maximum Static Loading | 5400 Pa | 5400 Pa |
| Rear Side Maximum Static Loading | 2400 Pa | 2400 Pa |
| Operating Temperature | -40 ~ 85 °C | -40 ~ 85 °C |
| Warranty | 12 Years Product, 30 Years Performance | 12 Years Product, 30 Years Performance |
| Price | AED 403 | AED 403 |
What the Two Records Share
Start with what does not change, because it is most of the sheet. Scientist LR7-72HVD and Guardian LR7-72HVDF are both dual-glass modules with 2.0 mm semi-tempered glass in an anodized aluminum alloy frame, both measure 2382×1134×30 mm and both weigh 33.5 kg. Each record states a temperature coefficient of Pmax of -0.26%/°C, a maximum system voltage of 1500 V, a 30 A maximum series fuse rating, front and rear static loads of 5400 Pa and 2400 Pa, and an operating range of -40 to 85 °C. The warranty line is identical too: 12 years on the product and 30 years on performance. Rails, clamps and handling are therefore the same job whichever build goes on the roof.
Where the Electrical Figures Differ
The difference is in the operating point. The Scientist LR7-72HVD record states a voltage at maximum power (Vmp) of 46.67 V with a current at maximum power (Imp) of 14.41 A. The Guardian LR7-72HVDF record states a Vmp of 44.87 V with an Imp of 14.55 A. Open-circuit voltage is practically the same — a Voc of 54.22 V on Scientist and 54.23 V on Guardian — and the short-circuit current is an Isc of 15.12 A against 15.06 A. So the string length an inverter accepts is decided by the same Voc on both, while the working voltage of a finished string is not the same. Keep a string to one build rather than mixing the two.
What Each Build Is Made For
The two records describe different jobs. Scientist is described as peak efficiency with top power generation performance, built on a TaiRay wafer with BC technology, suitable for industrial and commercial cement roofs and for high-temperature scenarios, with a lower operating temperature. Guardian is described as equipped with an HPBC 2.0 cell, with a unique frame design that reduces dust accumulation, high reliability under harsh conditions, and suitability for industrial and commercial roofs. The Guardian record also states a hailstone test (25 mm at 23 m/s), Protection Class II and an IEC Class C fire rating; the Scientist record carries no row for those three.
Which One for Which Roof
Choose by the site, because the rating will not decide it. On a roof where dust settles and cleaning is infrequent — low tilt, desert edge, a yard with traffic — the Guardian LR7-72HVDF is the build whose record is written for that condition. On a hot industrial or commercial cement roof where the brief is simply the most generation from the area, the Scientist LR7-72HVD is the build its record points to. Both are bifacial modules with the same frame and the same weight, and both are priced on this site by the same rule of USD 0.169 per watt, so the choice costs nothing either way.
The models in this comparison
Winner
Guardian LR7-72HVDF where dust accumulation is the problem to solve; Scientist LR7-72HVD for hot commercial and industrial roofs. Same 650 W, 24.1% and 33.5 kg on both.
Conclusion
Hi-MO X10 Scientist and Hi-MO X10 Guardian are the same module where it is measured with a tape or a scale, and nearly the same where it is measured with a meter: 650 W, 24.1% efficiency, 2382×1134×30 mm and 33.5 kg on both records. The Scientist LR7-72HVD works at a Vmp of 46.67 V, the Guardian LR7-72HVDF at 44.87 V, so a string should hold one build only. Beyond that the decision is the roof: Guardian for sites where dust builds up and conditions are harsh, Scientist for hot commercial and industrial roofs. The spec table above lists every row both records state.