--- title: "Fellow Energy FE54-18X Full Black 420W Solar Panel - Specs & Review | ComparePV" description: "Fellow Energy FE54-18X Full Black 420W solar panel. Specs: 21.50% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/fellow-energy-fe54-18x-full-black" updated: 2026-09-11 --- # Fellow Energy FE54-18X Full Black Efficiency leader, no clear weak spot 954 panels in the segment PERC 400-450 W ## Identity - **Manufacturer:** Fellow Energy - **Model:** FE54-18X Full Black - **Series:** FE54-18X Full Black - **Rated power:** 420 W - **Cell technology:** PERC ## How it compares Compared against segment PERC 400-450 W (954 panels). | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Power (Wp) | 420 W | 410 W | Typical | | | Module efficiency | 21.50% | 20.60% | Strong - top 4% | 7,958 | | Power density | 214.8 | 206.2 | Strong - top 5% | 8,110 | | Temperature coefficient | -0.326 | -0.350 | Strong - top 7% | 8,520 | | Weight (kg) | 21.0 kg | 22.0 kg | Strong - top 17% | | | Performance warranty | 25 yrs | 25 yrs | Typical | 9,798 | ### Full peer table | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Module efficiency | 21.50% | 20.60% | Strong - top 4% | 7,958 | | Power density | 214.8 | 206.2 | Strong - top 5% | 8,110 | | Temperature coefficient | -0.326 | -0.350 | Strong - top 7% | 8,520 | | Weight per kWp | 50.0 | 53.0 | Strong - top 17% | 3,317 | | Performance warranty | 25 yrs | 25 yrs | Typical | 9,798 | ### Strengths - **21.50% module efficiency** - Top 4% of the PERC 400-450 W segment, against a median of 20.60%. Ranked 7,958th in the whole database. - **214.8 watts per square metre** - Top 5% of the PERC 400-450 W segment, against a median of 206.2. Ranked 8,110th in the whole database. - **-0.326 %/°C temperature coefficient** - Top 7% of the PERC 400-450 W segment, against a median of -0.350. Ranked 8,520th in the whole database. - **Best for:** Residential, commercial and shaded-installations. ## Specification ### Electrical - **Rated power (Pmax):** 420 W - **Efficiency:** 21.50 % - **Voltage at Pmax (Vmp):** 31.74 V - **Current at Pmax (Imp):** 13.24 A - **Open-circuit voltage (Voc):** 37.63 V - **Short-circuit current (Isc):** 14.14 A - **Max system voltage:** 1500 V ### Temperature - **Temperature coefficient of Pmax:** -0.326 %/degC - **Temperature coefficient of Voc:** -0.258 %/degC - **Temperature coefficient of Isc:** 0.051 %/degC - **NOCT:** 45 degC ### Cell and construction - **Cell type:** Monocrystalline - **Cell technology:** PERC - **Cell count:** 108 ### Physical - **Length:** 1724 mm - **Width:** 1134 mm - **Thickness:** 30 mm - **Weight:** 21.0 kg - **Area:** 1.96 m2 - **Power density:** 214.8 Wp/m2 ### Warranty and degradation - **Product warranty:** 15 years - **Performance warranty:** 25 years - **Output guaranteed at end of warranty:** 83.1 % - **First-year degradation:** 2.50 % - **Annual degradation:** 0.60 % - **Output after 30 years:** 336 W ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 7958 of 14005 | | Power density | 8110 of 14005 | | Temperature coefficient | 8520 of 14005 | | Weight | 3317 of 14005 | | Warranty | 9798 of 14005 | ## Pros - **Full Black all-black aesthetics** - Black frame, black backsheet, and black monocrystalline cells create a uniform appearance that blends seamlessly into roof surfaces (tiles, metal roofing). Among the peer comparables, no model offers an equally complete Full Black finish at the same 420 Wp power class. - **Half-cut + 10BB: hot-spot resistance** - Half-cut cell architecture halves resistive losses and reduces hot-spot risk under partial shading. The 10-busbar (10BB) layout increases the active light-collection area and shortens current path length within each cell, directly translating to higher daily energy yield under variable irradiance conditions. - **Triple EL test on every module** - Fellow Energy declares three independent electroluminescence (EL) tests per module, ruling out cell micro-cracks before shipment. The Tier-1 industry standard is a single EL test or sampled inspection — triple verification is a clearly above-standard QC practice with no equivalent noted in the GCL-M10/54H or Phono Solar TWINPLUS datasheets. - **21.5% efficiency — top of PERC 420 Wp segment** - The module achieves 21.5% panel efficiency, matching the top of the peer-comparable range: GCL-M10/54H (21.5%), Solarspace SS8-54HSB (21.51%), and clearly outperforming Phono Solar TWINPLUS (20.98%). Higher efficiency directly reduces the roof area required to reach a given system output target. - **Tier-1 vertically integrated, 2.1 GW/yr capacity** - Fellow Energy operates its own cell production line (from wafer slicing to finished module) in Gaziantep, Turkey, across 3 factories with a combined capacity of 2.1 GW/year. Tier-1 (bankable) status means financing banks accept the panels as collateral in non-recourse project finance — material for commercial and leasing installations. ## Cons - **Power warranty: 83.1% at year 25** - Per ENF Solar data, the FE54-18X Full Black series guarantees 83.1% of rated power after 25 years, versus the ~84.8% Tier-1 industry benchmark (JA Solar, Jinko Solar) over the same period. For a 420 Wp module, that gap equates to roughly 7 W/module at year 25 — or approximately 140 W less guaranteed output across a typical 20-module residential system at end of warranty. - **Short operational history — founded 2020** - The manufacturer has been operating for only ~5–6 years against a 25-year power warranty commitment. Peer comparables such as Phono Solar (est. 1993) and GCL Group (est. 1990) have multi-decade reference portfolios. For warranty claims arising 15–25 years from now, the producer's shorter financial history represents additional counterparty risk for the end investor. ## About this series The FE54-18X Full Black series from Fellow Energy comprises photovoltaic modules designed for installations where roof aesthetics matter just as much as performance. **Full black aesthetics** - black frame, black backsheet, and black monocrystalline cells - allow the panels to blend harmoniously into the roof covering, giving the installation an elegant and discreet character. At the heart of the modules is **half-cut technology with low-LID PERC cells**, which minimizes internal losses, improves heat dissipation, and eliminates the risk of hot spots even under partial shading. Thanks to the **10-busbar cell design (10BB)**, the light-collecting surface area is increased, which directly translates into higher energy yield. Robustness is confirmed by a triple EL test of every module - a rare practice guaranteeing the absence of microcracks. Compatibility with high-voltage systems allows for longer strings to be built and reduces the overall cost of the installation (BoS). The modules are sorted and packed according to current, which limits mismatch losses and maximizes the yield of the entire system. **PID resistance** and a **15-year product warranty and 25-year power warranty** make this series a safe choice for residential and commercial installations where both reliability and a modern appearance matter. ## Notable figures - Efficiency of 21.5% is 0.9pp above the \*\*PERC 400-450W\*\* median (20.6%) - 214.8 W/m² power density - 8.6 W/m² more than \*\*PERC 400-450W\*\* median (206.2 W/m²), more power per roof area - Temperature coefficient of -0.33%/°C vs median -0.35%/°C means ~1% less power loss at 65°C - Weight of 21.0 kg is typical for \*\*PERC 400-450W\*\* panels - In the top 57% for efficiency among all PERC panels ## Questions ### Why do Fellow Energy FE54-18X Full Black panels look uniformly black on the roof? The FE54-18X Full Black series combines a black aluminum frame, black backsheet, and black monocrystalline PERC cells into a single cohesive unit. There are no contrasting silver elements visible from the street, unlike standard panels. The result is a sleek, low-profile appearance — ideal for residential or urban rooftops where a discreet installation aesthetic matters as much as energy output. ### What warranty comes with the Fellow Energy FE54-18X Full Black panels? Fellow Energy provides a 15-year product warranty covering manufacturing defects and material failures, plus a 25-year power output warranty guaranteeing the module retains a specified performance level throughout that period. As a Tier 1 manufacturer headquartered in Turkey, Fellow Energy has the financial stability to back warranty claims over the full 25-year lifespan of the installation. ### Does the half-cut PERC technology in the FE54-18X series improve performance under partial shading? Yes. Half-cut cells reduce internal resistance and limit the impact of localized shading on the full module. Combined with low-LID PERC cells and a 10-busbar (10BB) layout, the panel handles partial shading from chimneys, dormers, or antennas more effectively than conventional full-cell modules. This design also significantly reduces the risk of hot-spot formation, which is the leading cause of premature cell degradation. ### What does triple EL testing on the FE54-18X panels mean and why does it matter when buying? Electroluminescence (EL) testing reveals microcracks invisible to the naked eye. Fellow Energy performs this test three times — after cell production, after lamination, and before shipment. Most manufacturers run it only once. Triple EL inspection virtually eliminates the risk of a defective module reaching an installation and degrading prematurely, which directly supports the rated output over the full 25-year power warranty period. ### Can Fellow Energy FE54-18X 420 Wp panels be wired into longer strings with a high-voltage inverter? Yes, the FE54-18X series is compatible with high-voltage systems, enabling longer strings without additional power optimizers. This reduces the number of cables and connectors, lowering BoS costs and simplifying system design. Before finalizing the string configuration, verify the maximum input voltage of the specific inverter and calculate the number of modules accordingly to stay within safe operating limits. ### Are Fellow Energy FE54-18X Full Black panels resistant to PID and thermal degradation? The FE54-18X series carries certified PID (Potential Induced Degradation) resistance, protecting performance at high system voltages. The half-cut PERC cell architecture also improves heat dissipation, lowering operating cell temperature. Together, these features result in a slower annual degradation rate and higher real-world energy yield, particularly on south-facing rooftops or in high-irradiance climates. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/FE54-18X-Full-Black-ff9840f68e8b.pdf) ## Alternatives | Panel | Power | How it differs | | --- | --- | --- | | [Just Solar JST-EDMH-(445-465)W-TD (465W class)](https://comparepv.com/panel/just-solar-jst-edmh-445-465-w-td-465w-class) | 465 W | +45 W, +2.3 pp, +5 yr warranty | | [Luxor Solar LX-465M/182R-96+ GG](https://comparepv.com/panel/luxor-lx-465m-182r-96-gg) | 465 W | Cooler, +2.3 pp, +5 yr warranty | | [Maxeon SPR-MAX7-470](https://comparepv.com/panel/maxeon-spr-max7-470) | 470 W | Cooler, +2.2 pp, +15 yr warranty | | [AIKO AIKO-A470-MAH54Mb](https://comparepv.com/panel/aiko-aiko-a470-mah54mb) | 470 W | +50 W, cooler, +2.1 pp | | [AIKO AIKO-A460-MAH54Mb](https://comparepv.com/panel/aiko-shenzhen-aiko-digital-energy-technology-co-ltd-aiko-a460-mah54mb-1) | 460 W | +40 W, +2.1 pp, +5 yr warranty | | [TCL Zhonghuan HSM-BD54-LA470](https://comparepv.com/panel/tcl-zhonghuan-hsm-bd54-la470) | 470 W | +50 W, cooler, +2.1 pp | | [Fellow Energy FE54-18X(N)-415W](https://comparepv.com/panel/fellow-energy-fe54-18x-n-415w) | 415 W | Cooler, -0.3 pp, +5 yr warranty | | [Fellow Energy FE54-18X(N)-425W](https://comparepv.com/panel/fellow-energy-fe54-18x-n-425w) | 425 W | Cooler, +0.2 pp, +5 yr warranty | | [Fellow Energy FE54-18X(N)-430W](https://comparepv.com/panel/fellow-energy-fe54-18x-n-430w) | 430 W | Cooler, +0.5 pp, +5 yr warranty | | [Fellow Energy FE54-18X(N)-435W](https://comparepv.com/panel/fellow-energy-fe54-18x-n-435w) | 435 W | Cooler, +0.8 pp, +5 yr warranty | | [Longi Solar LR7-54HJD-510M](https://comparepv.com/panel/longi-lr7-54hjd-510m) | 510 W | +90 W, cooler, +3.5 pp | | [AIKO AIKO-A495-MCE54Mw](https://comparepv.com/panel/aiko-aiko-a495-mce54mw) | 495 W | +75 W, cooler, +3.3 pp | | [Longi Solar LR7-54HJD-505M](https://comparepv.com/panel/longi-lr7-54hjd-505m) | 505 W | +85 W, cooler, +3.2 pp | | [AIKO AIKO-A490-MCE54Mw](https://comparepv.com/panel/aiko-aiko-a490-mce54mw) | 490 W | +70 W, cooler, +3.0 pp | | [Longi Solar LR7-54HJD-500M](https://comparepv.com/panel/longi-lr7-54hjd-500m) | 500 W | +80 W, cooler, +3.0 pp | | [Talesun CIPRO-TN9C54M-500W](https://comparepv.com/panel/talesun-cipro-tn9c54m-500w) | 500 W | +80 W, cooler, +3.0 pp | --- Source: https://comparepv.com/panel/fellow-energy-fe54-18x-full-black Not in this file, on the page: a thirty-year output simulator and alternatives filtered by how closely they match these dimensions.