--- title: "Growatt TS-EFS150M 150W Solar Panel - Specs & Review | ComparePV" description: "Growatt TS-EFS150M 150W solar panel. Specs: 18.60% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/growatt-ts-efs150m" updated: 2026-09-11 --- # Growatt TS-EFS150M Light for its output, weak in heat 54 panels in the segment PERC 150-200 W ## Identity - **Manufacturer:** Growatt - **Model:** TS-EFS150M - **Series:** EFSM series - **Rated power:** 150 W - **Cell technology:** PERC ## How it compares Compared against segment PERC 150-200 W (54 panels). | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Power (Wp) | 150 W | 175 W | Weak - bottom 6% | | | Module efficiency | 18.60% | 16.60% | Strong - top 16% | 13,087 | | Power density | 153.3 | 162.7 | Typical | 13,733 | | Temperature coefficient | -0.420 | -0.370 | Weak - bottom 3% | 13,796 | | Weight (kg) | 2.6 kg | 11.3 kg | Strong - top 1% | | | Performance warranty | - | 25 yrs | | | ### Full peer table | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Module efficiency | 18.60% | 16.60% | Strong - top 16% | 13,087 | | Power density | 153.3 | 162.7 | Typical | 13,733 | | Temperature coefficient | -0.420 | -0.370 | Weak - bottom 3% | 13,796 | | Weight per kWp | 17.3 | 68.5 | Strong - top 1% | 54 | | Performance warranty | - | 25 yrs | | | ### Strengths - **17.3 kg per kWp** - Top 1% of the PERC 150-200 W segment, against a median of 68.5. Ranked 54th in the whole database. - **18.60% module efficiency** - Top 16% of the PERC 150-200 W segment, against a median of 16.60%. ### Watch out for - **-0.420 %/°C temperature coefficient** - Bottom 3% of the PERC 150-200 W segment, against a median of -0.370. Ranked 13,796th in the whole database. - **Best for:** Residential, commercial and shaded-installations. - **Not ideal for:** Hot climates. ## Specification ### Electrical - **Rated power (Pmax):** 150 W - **Efficiency:** 18.60 % - **Voltage at Pmax (Vmp):** 19.51 V - **Current at Pmax (Imp):** 7.69 A - **Open-circuit voltage (Voc):** 23.83 V - **Short-circuit current (Isc):** 8.16 A - **Max system voltage:** 600 V ### Temperature - **Temperature coefficient of Pmax:** -0.420 %/degC - **Temperature coefficient of Voc:** -0.320 %/degC - **Temperature coefficient of Isc:** 0.040 %/degC ### Cell and construction - **Cell type:** Monocrystalline - **Cell technology:** PERC - **Cell count:** 36 ### Physical - **Length:** 1460 mm - **Width:** 670 mm - **Thickness:** 3 mm - **Weight:** 2.6 kg - **Area:** 0.98 m2 - **Power density:** 153.3 Wp/m2 ### Warranty and degradation ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 13087 of 14005 | | Power density | 13733 of 14005 | | Temperature coefficient | 13796 of 14005 | | Weight | 54 of 14005 | | Warranty | 13880 of 14005 | ## Pros - **Growatt Ecosystem Integration** - For systems built around Growatt inverters — a residential inverter market leader with ~4.7% global share per S&P Global 2025 — pairing the EFSM modules with the same manufacturer's inverter simplifies servicing, warranty management, and MPPT configuration, offering a tangible operational advantage for installers. - **PERC: Superior Low-Light Performance** - Mono PERC technology delivers better efficiency under diffuse irradiance and low solar incidence angles compared to standard mono-Si modules. With a typical temperature coefficient of −0.35 %/°C, PERC reduces thermal losses at the roof temperatures common in Polish summers (60–70°C). - **Compact 150 Wp Format — Niche Installation Flexibility** - The 150 W form factor enables installations where standard 400–500 Wp modules cannot fit geometrically: small roof sections, annexes, mobile applications, and off-grid supplemental power. Availability of efficient modules in this power class remains limited. - **18.6% Efficiency on Par with Top Solar TS-EFS** - Compared to its direct counterpart, the Top Solar TS-EFS (18.6%), the EFSM module achieves identical efficiency while benefiting from the broader service infrastructure of a larger manufacturer (Growatt, founded 2010, present in over 180 countries). ## Cons - **No BNEF Tier-1 Status for PV Modules** - Growatt does not appear on the BNEF Tier-1 bankable PV module list (tier\_1\_bankable: false in manufacturer data). For externally financed projects or those subject to bankability assessment, this may complicate securing project finance or result in higher insurance premiums for the installation. - **Efficiency Below Two of Three Comparable Modules** - The Isola New Energy 210M SPLIT CELL achieves 19.63% (+1.03 pp vs. EFSM) and the SunEvo Solar SE5-150M reaches 18.94% (+0.34 pp). At identical module area, a 1 pp efficiency gap translates in practice to approximately 5–6% less energy yield from the same number of panels. - **PERC: A Technology in Market Retreat** - According to BNEF and ITRPV reports (2025), TOPCon has surpassed 70% share of new global PV production, displacing PERC. PERC modules exhibit higher LID (Light-Induced Degradation) rates and a somewhat less favorable temperature coefficient than TOPCon (−0.29 %/°C), implying faster erosion of any remaining technology advantage over a 25-year service life. - **Growatt Is an Inverter Manufacturer, Not a PV Module Specialist** - Growatt has built its brand and service network on inverters — its presence in the PV module segment is considerably less established. The absence of publicly available independent test results (e.g., PVEL/Kiwa) for the EFSM series makes it difficult to independently verify the declared degradation rates and mechanical performance. ## About this series The Growatt EFSM series comprises modules designed for stable energy production under real installation conditions - even when partial shading, varying roof orientations, or higher operating temperatures occur. The use of modern cell architectures (including solutions to minimize losses at connections) results in more predictable yields and better performance under less sunlight, which is particularly important in Poland due to the climate. In practice, EFSM stands out for its **high resistance to degradation** and **improved shading tolerance**, meaning that the installation loses parameters more slowly and is less affected by a single problematic module. Furthermore, the design focused on **mechanical durability** makes installation on roofs exposed to wind and snow easier, and **stable operation at elevated temperatures** helps maintain production during the summer. This is a good choice for single-family homes, businesses, and prosumer installations, where **reliability and predictable output** are more important than just a parameter from the catalog. ## Notable figures - At 18.6% efficiency, this panel is 0.8pp below the \*\*PERC 0-400W\*\* median of 19.4% - At 153.3 W/m², this panel generates 41.1 W/m² less per unit area than \*\*PERC 0-400W\*\* median (194.4 W/m²) - At -0.42%/°C, loses 0.06pp more power per degree than \*\*PERC 0-400W\*\* median (-0.36%/°C) - 2.6 kg weight - 17.9 kg lighter than \*\*PERC 0-400W\*\* median (20.5 kg), reducing installation effort - Ranked #13087 out of 14005 panels for efficiency in the database ## Questions ### What is PERC cell technology in the Growatt EFSM series and is it worth choosing? PERC (Passivated Emitter Rear Contact) adds a reflective passivation layer to the rear of each cell, redirecting unabsorbed light back into the silicon for a second conversion pass. In practice, this means better low-light efficiency and higher overall yield compared to standard monocrystalline cells without passivation. The EFSM series uses this technology, which translates to more consistent output in Central European climates where overcast days are frequent. ### How does the Growatt EFSM series perform under partial shading? The EFSM series is designed to limit mismatch losses when part of the array is shaded. Its cell architecture reduces the degree to which a single shaded module pulls down the output of an entire string compared to conventional modules. This matters on rooftops with chimneys, dormers, or neighboring structures where uniform irradiance across all panels is difficult to guarantee. ### What is the maximum power output of Growatt EFSM panels and what system size do they suit? The EFSM series tops out at 150 Wp per module. This is a compact format best suited to smaller residential prosumer systems, homes with limited usable roof area, or supplementary arrays added to an existing installation. When sizing a system, keep in mind that reaching a given total capacity will require more EFSM modules than today's high-power panels rated above 400 Wp. ### Are Growatt EFSM panels suitable for rooftop installation in a Central European climate — how do they handle wind and snow loads? The EFSM series emphasizes mechanical durability, with frames and glass engineered for typical winter load conditions. Modules in this category commonly meet snow load ratings of around 5,400 Pa and wind load ratings of around 2,400 Pa, but verify the exact figures in the official datasheet before purchase. The monofacial design simplifies mounting on standard pitched roofs using conventional rail systems. ### Is Growatt primarily an inverter brand — are the EFSM modules an original Growatt product? Growatt is best known for its inverters, but the company also markets PV modules under its own brand, including the EFSM series. Note that Growatt is not classified as a Tier 1 module manufacturer, which may be relevant for insurance underwriting or project financing requirements. For residential prosumer installations this distinction is rarely a dealbreaker, but it is worth discussing with your installer. ### What warranty comes with Growatt EFSM panels and what does the linear power output warranty cover? Manufacturers in this segment typically offer a product warranty covering material and workmanship defects (commonly 10–12 years) alongside a linear power output warranty lasting 25–30 years, guaranteeing at least 80–83% of rated power at end of term. Exact terms should be confirmed in the current EFSM warranty document available from your distributor or the Growatt website, as conditions may vary by market and production date. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/150W-ETFE-mono-flexible-solar-panel-b0e69534d487.pdf) ## Alternatives | Panel | Power | How it differs | | --- | --- | --- | | [Gamko New Energy GKA182M150W](https://comparepv.com/panel/gamko-new-energy-gka182m150w) | 150 W | Heavier, +4.4 pp | | [Gamko New Energy GKA182M160W](https://comparepv.com/panel/gamko-new-energy-gka182m160w) | 160 W | +10 W, heavier, +4.4 pp | | [Gamko New Energy GKA182M180W](https://comparepv.com/panel/gamko-new-energy-gka182m180w) | 180 W | +30 W, heavier, +4.4 pp | | [Gamko New Energy GKA182M200W](https://comparepv.com/panel/gamko-new-energy-gka182m200w) | 200 W | +50 W, heavier, +4.4 pp | | [Gamko New Energy GKA182M120W](https://comparepv.com/panel/gamko-new-energy-gka182m120w) | 120 W | -30 W, heavier, +4.4 pp | | [Gamko New Energy GKA182M135W](https://comparepv.com/panel/gamko-new-energy-gka182m135w) | 135 W | -15 W, heavier, +4.4 pp | | [Gamko New Energy GKA182M100W](https://comparepv.com/panel/gamko-new-energy-gka182m100w) | 100 W | -50 W, heavier, +4.4 pp | | [Gamko New Energy GKA182M110W](https://comparepv.com/panel/gamko-new-energy-gka182m110w) | 110 W | -40 W, heavier, +4.4 pp | | [JA Solar NS-100MH-36](https://comparepv.com/panel/ja-solar-ns-100mh-36) | 100 W | -50 W, cooler, +2.7 pp | | [PolyCrown Solar Tech NS-100MH-36](https://comparepv.com/panel/polycrown-solar-tech-ns-100mh-36) | 100 W | -50 W, cooler, +2.7 pp | | [Heckert Solar ZEUS 1.2 FullBlack 280W](https://comparepv.com/panel/heckert-solar-zeus-1-2-fullblack-280w) | 280 W | +130 W, cooler, +4.7 pp | | [Gamko New Energy GKA182M285W](https://comparepv.com/panel/gamko-new-energy-gka182m285w) | 285 W | +135 W, heavier, +4.4 pp | | [Gamko New Energy GKA182M240W](https://comparepv.com/panel/gamko-new-energy-gka182m240w) | 240 W | +90 W, heavier, +4.4 pp | | [Gamko New Energy GKA182M260W](https://comparepv.com/panel/gamko-new-energy-gka182m260w) | 260 W | +110 W, heavier, +4.4 pp | | [Gamko New Energy GKA182M270W](https://comparepv.com/panel/gamko-new-energy-gka182m270w) | 270 W | +120 W, heavier, +4.4 pp | | [DMEGC DM270M10T-B32HBT](https://comparepv.com/panel/hengdian-group-dmegc-magnetics-co-ltd-dmegc-solar-dm270m10t-b32hbt) | 270 W | Cooler, heavier, +4.3 pp | --- Source: https://comparepv.com/panel/growatt-ts-efs150m Not in this file, on the page: a thirty-year output simulator and alternatives filtered by how closely they match these dimensions.