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Longi Solar Brand review

LR7-60HVHL-535M

535 Wp Back Contact
ComparePV verdict

Light for its output, no clear weak spot

Rank 3,428 of 14,005
Compare panels Datasheet PDF
Power (Wp)
535
Strong · top 23%
Efficiency (%)
23.70
Typical · median 23.30%
Density (Wp/m²)
237.1
Typical · median 233.4
Temp (%/°C)
-0.260
Typical · median -0.260
Weight (kg)
16.3
Strong · 7.2 kg below median
Warranty (yrs)
30
Typical · median 30 yrs

The Longi Solar Hi-MO X10 Guardian series represents a breakthrough in the photovoltaics sector, utilizing advanced Back Contact HPBC 2.0 cell technology. These modules were designed to eliminate the most common operational problems, offering a unique Anti-Dust design, which, thanks to a special frame without a side edge, prevents the accumulation of dust and water. This solves the problem of so-called mud streaks, which in traditional panels lead to shading of the bottom cells and significant power losses over time. The Guardian variant also stands out with its Light Design lightweight construction, being approximately 30 percent lighter than standard modules, which makes it an ideal choice for roofs with limited structural load capacity. With efficiency reaching 24.8 percent, this series ensures maximum energy yield even in low sunlight conditions, and the lack of busbars on the front gives the installation a luxurious, black appearance. It distinguishes itself from the competition through intelligent shading management and increased resistance to the formation of hot-spot points. This is a solution dedicated to investors looking for maintenance-free systems with the highest aesthetics, which maintain full performance for decades without the need for frequent cleaning of the glass surface.

Ranking

265 panels in the segment Back Contact 435-635 W
Metric This panel Median Position in segment Overall rank
Module efficiency 23.70% 23.30% Typical 517
Power density 237.1 233.4 Typical 517
Temperature coefficient -0.260 -0.260 Typical 511
Weight per kWp 30.5 47.3 Strong · top 4% 144
Performance warranty 30 yrs 30 yrs Typical 21
Colour key Strong - top 25% Typical - middle 50% Weak - bottom 25%

Signals from the data

6 positive · 1 caution
Best for

Residential, commercial and hot-climate.

Strengths
30.5 kg per kWp

Top 4% of the Back Contact 435-635 W segment, against a median of 47.3. Ranked 144th in the whole database.

What owners get
Up to 24.8% efficiency - segment leader

Peak efficiency of 24.8% clearly outperforms peer comparables (Exiom, Fellow Energy, Premier Energies - all around 21.7%), delivering higher energy yield per roof area and lower installation cost per Wp.

HPBC 2.0 Back Contact technology

Back Contact cells with no visible front busbars eliminate shading losses caused by busbars and give the module a uniform, premium black appearance, while also reducing hot-spot temperatures under partial shading conditions.

Anti-Dust frame and Light Design construction

The frameless side edge design prevents dust and water accumulation (avoiding the so-called 'mud stripe' effect), and the Light Design variant is up to roughly 30% lighter than standard modules, expanding installation options on load-limited roofs without extra structural reinforcement.

30-year power warranty

The 30-year linear power warranty exceeds the 25-year standard offered by many tier-1 manufacturers, extending the protected payback period for the system owner.

Longi as a tier-1 bankable manufacturer

Longi Solar, founded in 2000 and classified as tier-1 bankable, provides financial stability for warranty servicing throughout the full coverage period, which matters given the 30-year power commitment.

Trade-offs
No bifacial variant in this configuration

Unlike some peer comparables (e.g., Premier Energies with a dual-glass bifacial module), the analyzed Guardian variant is monofacial, forgoing the additional rear-side yield gain that bifacial modules can achieve on high-albedo surfaces or flat rooftops.

Notes from the database
  • At 23.7% efficiency, this panel is on par with typical Back Contact 500-550W modules
  • At 237.1 W/m² power density, roof space requirements are typical for Back Contact 500-550W panels
  • Temperature coefficient of -0.26%/°C matches the Back Contact 500-550W median
  • Weight of 16.3 kg (7.0 kg below Back Contact 500-550W median of 23.3 kg) allows easier transport and roof mounting
  • In the top 4% for efficiency among all Back Contact panels

Specifications

Open datasheet PDF
Nominal power (Pmax) 535 Wp Nameplate at 1000 W/m², 25 °C
Module efficiency 23.70 % Typical Segment median 23.30%
Vmpp · Impp 37.01 V · 14.46 A Operating point at max power
Voc · Isc 44.78 V · 15.15 A Sizes the string length
Max system voltage 1500 V Longer strings than 1000 V modules
Dimensions 1990×1134×30 mm · 2.26 m² of roof
Weight 16.3 kg Strong Strong · 7.2 kg below median
Cells 120 · Back Contact Monocrystalline
Coefficient Pmax -0.260 %/°C Typical median -0.260 of its segment
Coefficient Voc · Isc -0.200 · 0.050 %/°C
NOCT 45 °C At 800 W/m², 20 °C ambient
Product warranty 15 years Hardware defects only
Performance warranty 30 years Typical median 30 yrs · median 30 yrs
End-of-warranty output 88.8 % Equals 475 W guaranteed
Degradation 1.00 → 0.35 % First year, then annual

Simulations

Live - change any input
Lifetime output & value
30 years at 1200 kWh/kWp/year and €0.50 per kWh
Power in year 30
-
Lifetime energy
-
Energy value
-

Degradation from this panel's own datasheet figures. No inverter, soiling or shading losses.

Heat losses
-0.260 %/°C against a segment median of -0.260
-
Filter these
Size
Panel Power Eff. Temp. Weight Difference
Longi Solar LR7-60HVHL-535M 535 W 23.70% -0.260 16.3 kg You are here
LR7-54HJD-510M 510 W 25.00% -0.240 23.5 kg -25 W, heavier, +1.3 pp
AIKO-A495-MCE54Mw 495 W 24.80% -0.260 21.0 kg -40 W, heavier, +1.1 pp
LR7-60HVH-560M 560 W 24.80% -0.260 25.0 kg +25 W, heavier, +1.1 pp
LR7-54HJD-505M 505 W 24.70% -0.240 23.5 kg -30 W, heavier, +1.0 pp
LR7-60HVH-555M 555 W 24.60% -0.260 25.0 kg +20 W, heavier, +0.9 pp
AIKO-A490-MCE54Mw 490 W 24.50% -0.260 21.0 kg -45 W, heavier, +0.8 pp
LR7-54HJD-500M 500 W 24.50% -0.240 23.5 kg -35 W, heavier, +0.8 pp
LR7-60HVH-540M 540 W 23.90% -0.260 25.0 kg Heavier
LR7-60HVH-545M 545 W 24.20% -0.260 25.0 kg +10 W, heavier, +0.5 pp
LR7-60HVHL-550M 550 W 24.40% -0.260 16.3 kg +15 W, +0.7 pp
JAT60S40-540/LR 540 W 24.40% -0.260 23.5 kg Heavier, +0.7 pp
GK-5-60HG-540M 540 W 24.40% -0.260 23.3 kg Heavier, +0.7 pp
JKM545-54QL6-DV-F1-EU 545 W 24.27% -0.260 27.5 kg +10 W, heavier, +0.6 pp

Found 86 panels of the same or similar size to this one, within ±10 mm. See them here Found 94 panels of the same or similar size to this one, within ±25 mm. See them here Found 588 panels of the same or similar size to this one, within ±50 mm. See them here Found 1466 panels of the same or similar size to this one, within ±100 mm. See them here

Common questions

6 answered
What is HPBC 2.0 technology in the LONGi Hi-MO X10 Guardian panels and what does it mean for the end user?
HPBC 2.0 (Hybrid Passivation Back Contact) moves all electrical contacts to the rear of the cell, leaving the front surface entirely busbar-free. This maximizes light absorption and enables module efficiency up to 24.8%. In practice, the Hi-MO X10 Guardian reduces power losses by more than 70% and lowers hotspot temperatures by 28% compared to conventional modules, translating to higher annual energy yield and improved long-term reliability.
Are LONGi Hi-MO X10 Guardian Light Design panels suitable for rooftops with limited load-bearing capacity?
Yes. The Light Design variant weighs just 16.3 kg (approx. 7.2 kg/m²), making it roughly 30% lighter than standard single-glass modules. It is purpose-built for commercial and industrial rooftops, canopies, garages, and older structures where structural load limits restrict conventional modules. Maximum output reaches 560 Wp at 24.8% efficiency, so reduced weight does not come at the cost of performance.
How does the Anti-Dust frame design in the Hi-MO X10 Guardian work and does it actually reduce cleaning frequency?
The Anti-Dust frame eliminates the conventional raised side-edge lip, allowing rainwater to run off freely without leaving mud strips along the bottom edge. Those deposits in standard frames shade the lower cells and cause measurable power losses throughout the year. In climates with regular rainfall, owners can expect significantly less frequent or even unnecessary manual cleaning, making the Hi-MO X10 Guardian a genuinely low-maintenance solution.
How do LONGi Hi-MO X10 Guardian panels perform in winter and at low temperatures?
HPBC 2.0 cell technology delivers a low temperature coefficient of -0.26%/°C (Pmax). This means the module loses minimal power as cell temperature rises in summer and produces excellent output on cold, sunny winter days. Standard PERC or TOPCon modules typically carry a coefficient of around -0.35%/°C, a difference that adds up to a noticeable improvement in annual energy yield under Central European climate conditions.
What warranty does LONGi Solar provide on the Hi-MO X10 Guardian series?
LONGi offers a 15-year product warranty covering manufacturing defects and materials, plus a 30-year linear power warranty guaranteeing at least 88.85% of rated output at the end of year 30. LONGi is a Tier 1 bankable manufacturer, meaning warranty claims are supported by financial strength and backed through authorized distributors across Europe. The 30-year power guarantee ranks among the longest currently available in the PV module market.
How does the LONGi Hi-MO X10 Guardian differ from standard monofacial TOPCon modules?
The key difference is cell architecture. Back Contact technology relocates all electrical interconnections to the rear of the cell, eliminating front-side busbars entirely and maximizing the active light-absorbing area. As a result, the Hi-MO X10 Guardian achieves 24.8% module efficiency, while premium TOPCon modules typically reach 22-23%. The module is not bifacial, but the 0BB front design combined with the Anti-Dust or Light Design frame makes it purpose-built for rooftop installations demanding premium aesthetics and minimum structural load.
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