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October 23, 2023

LONGi LR5-54HIB Hi-MO 5 Series Solar Panel Review

Solar review

LONGi Introduction:

Headquartered in China, LONGi is the world’s largest solar panel manufacturer. The company specialises in monocrystalline photovoltaic panels, unlike some other brands which produce cheaper but less-efficient polycrystalline cell technology. More and more companies are now concentrating on the polycrystalline type of solar panel.

The company is rated Tier 1 by Bloomberg: that is from their business analysis and means LONGi has robust financials and is not likely to have issues as some other solar manufacturers have in the past. This should provide consumers with peace of mind, as their solar panels have a lifespan of 25-30 years and the company is still very much likely to be in business over this time period.


LONGHi Company Overview:

LONGi Solar was founded in February 2000 as Xi’an LONGi Silicon Materials Corporation. Originally a supplier for other renewables companies, it moved into the retail market selling its own solar panels globally.

LONGi has nine manufacturing plants, seven of them in China, and the remaining two are based in Malaysia and Vietnam. Quality control is a particular focus for LONGi and they foreground reliability and high consumer satisfaction with their products.

The company also puts a significant amount of resources into research and development. Solar panel technology is a highly competitive sector, and LONGi aspires to be at the cutting-edge of development. Their motto is: “To make the best of solar energy to build a green world.”

LONGi has gained multiple industry awards for its products. On the PVEL Scorecard – a kind of “Which Report” on solar panels – rigorous independent testing gave LONGi panels regular high rankings. This testing ensures that users will be purchasing solar panels which have stood up to harsh environments and so will be able to withstand the sort of stresses that the inclement UK weather can provide.


LONGi Hi-MO 5 Series of Solar Panels

LONGi has several different ranges of solar panels in its offering. This is the Hi-MO 5 Series, which is suitable for larger residential roofs and smaller commercial buildings. LONGi panels come with a 12 year warranty for materials and processing, and a 25 year warranty for extra linear power output.

The LONGi Hi-MO 5 series features excellent photovoltaic technology embedded in high-quality solar cells, which ensured that LONGi was the winner of the 2021 Intersolar award in the Photovoltaic Category. This series consists of five different panels with power outputs ranging from 390 to 410 watts at maximum power output. Module efficiencies range from 20-21%.

This product range is considered one of the best designs from this manufacturer. Hi-MO 5 panels are fabricated using technological enhancements like bifacial, half-cut and PERC solar cell technology inserted in high-quality monocrystalline silicon (mono c-Si) wafers. These give the best efficiency on the market. 

Though a gain of 1-2% in real power generated over other panels might seem small, over years of operation it will add up to a considerable amount of extra electricity output which means lower costs and better ROI in the long run.


LONGi Hi-MO Main Features

  1. Monocrystalline Wafer Technology


Every solar cell in the Hi-MO 5 range features high-quality P-type monocrystalline silicon wafers doped with gallium, which has been shown to be stable, cost-efficient, durable and produces improved efficiency for the module.


  1. Half-cut cell manufacturing


This technology uses twice as many half-size cells to power the module, hence the name “half-cut”. The benefits of this are higher efficiency by significantly reducing power losses at the initial stages before the DC current leaves the PV panel.


  1. Bifacial


Essentially, both sides of the module generate electricity. This means that the sun’s bountiful energy hitting either face of the panel will create power. This could increase energy production by as much as 30%. The rear side of the panel is carefully protected from the weather so that this configuration will not make it more vulnerable to rain and dust.


  1. PERC


LONGi also uses Passivated Emitter and Rear Cell (PERC) technology. This is a long-winded way of saying they add a reflective layer at the rear of the cell, which bounces back unabsorbed solar radiation, increasing efficiency. This is claimed to produce 6% to 12% more energy than traditional solar modules.


  1. Reduced Degradation


Hi-MO 5 panels are particularly good in terms of degradation. Like most things, solar panels are subject to wear and tear. Over time, the energy output drops, as the panels become less efficient. LONGi have paid particular attention to this and their panels are subject to reduced degradation. 

Installed modules are normally expected to lose 2% efficiency in year one, and 0.45% per year after that for up to 30 years after the module was installed. At the end of their 30 year lifespan these panels would be expected to deliver 84.95% of their original rated power output. This is above the industry average, which is 80% output at 25 years.


LONGHi Solar Specifications

  • Cell Orientation: 108 (6×18)


  • Frame: Anodized aluminium alloy


  • Glass: 32mm coated tempered glass


  • Weight: 21.5kg


  • Dimensions: 1722x1134x30mm


Module Type LR5-54HIB-390M LR5-54HIB-395M LR5-54HIB-400M LR5-54HIB-405M LR5-54HIB-410M
Testing Condition STC STC STC STC STC
Maximum Power (Pmax/W) 390 395 400 405 410
Open Circuit Voltage (Voc/V) 36.5 36.65 36.8 36.95 37.1
Short Circuit Current (Isc/A) 13.35 13.55 13.66 13.74 13.84
Voltage at Maximum Power (Vmp/V) 30.8 30.95 31.1 31.25 31.4
Current at Maximum Power (Imp/A) 12.67 12.77 12.87 12.96 13.06
Module Efficiency (%) 20 20.2 20.5 20.7 21


LONGHi Solar Panel FAQs

Q: How many solar panels would fit on a normal-size house roof?


A: Normally 6-10 KW arrays are used on UK residences, but it depends on location and how much power is required to be generated.


Q: Are solar panels reliable?


A: Modern solar panels are extremely reliable. They are “solid state” so have virtually no moving parts to break. They do age, however, this is called “degradation” as the power output reduces over time.


Q: What warranty do LONGHi offer?


A: 12 year warranty for materials and processing, which is fairly standard in the industry. LONGi also offers an excellent 25 years warranty for the power output.


Q: Can you fit LONGi panels on flat roofs?


A: LONGi panel arrays can be deployed on a wide variety of different types of roofs, including flat roofs. The exact configuration and mounting needs to be determined by the installer.


LONGi Solar Panel Summary

LONGi Solar has become the world’s largest solar panel manufacturer and is also concentrating resources into R&D to create cutting-edge, innovative solar cell technologies like PERC. Using its a massive production capacity, LONGi is not only generally driving down costs of the silicon wafers and solar cells but also producing highly-efficient, cost-effective solar panels for residential usage

The panels are robust and represent the culmination of a great deal of research into monocrystalline wafers, which are the LONGi speciality, as well as half-cells, bifacial modules and PERC. 

Overall, LONGi Hi-MO 5 solar panels are good value for money for those looking for affordable solar panels with an advanced specification. The LONGi prime benefit is reduced  long-term degradation, which should increase lifespan and provide a better return on investment.

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