--- title: "CSUN CSUN370-120M 370W Solar Panel - Specs & Review | ComparePV" description: "CSUN CSUN370-120M 370W solar panel. Specs: 20.30% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/csun-csun370-120m" updated: 2026-09-11 --- # CSUN CSUN370-120M Space saver, weak in heat 579 panels in the segment PERC 350-400 W ## Identity - **Manufacturer:** CSUN - **Model:** CSUN370-120M - **Series:** Mars Series Half Cell - **Rated power:** 370 W - **Cell technology:** PERC ## How it compares Compared against segment PERC 350-400 W (579 panels). | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Power (Wp) | 370 W | 380 W | Typical | | | Module efficiency | 20.30% | 19.90% | Strong - top 16% | 11,769 | | Power density | 203.1 | 199.0 | Strong - top 15% | 11,759 | | Temperature coefficient | -0.370 | -0.350 | Weak - bottom 16% | 13,081 | | Weight (kg) | 19.5 kg | 21.4 kg | Strong - top 20% | | | Performance warranty | 25 yrs | 25 yrs | Typical | 9,798 | ### Full peer table | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Module efficiency | 20.30% | 19.90% | Strong - top 16% | 11,769 | | Power density | 203.1 | 199.0 | Strong - top 15% | 11,759 | | Temperature coefficient | -0.370 | -0.350 | Weak - bottom 16% | 13,081 | | Weight per kWp | 52.7 | 55.8 | Strong - top 20% | 6,344 | | Performance warranty | 25 yrs | 25 yrs | Typical | 9,798 | ### Strengths - **203.1 watts per square metre** - Top 15% of the PERC 350-400 W segment, against a median of 199.0. - **20.30% module efficiency** - Top 16% of the PERC 350-400 W segment, against a median of 19.90%. - **52.7 kg per kWp** - Top 20% of the PERC 350-400 W segment, against a median of 55.8. ### Watch out for - **-0.370 %/°C temperature coefficient** - Bottom 16% of the PERC 350-400 W segment, against a median of -0.350. - **Best for:** Residential, commercial and shaded-installations. - **Not ideal for:** Hot climates. ## Specification ### Electrical - **Rated power (Pmax):** 370 W - **Efficiency:** 20.30 % - **Voltage at Pmax (Vmp):** 34.40 V - **Current at Pmax (Imp):** 10.76 A - **Open-circuit voltage (Voc):** 40.50 V - **Short-circuit current (Isc):** 11.52 A - **Max system voltage:** 1500 V ### Temperature - **Temperature coefficient of Pmax:** -0.370 %/degC - **Temperature coefficient of Voc:** -0.286 %/degC - **Temperature coefficient of Isc:** 0.057 %/degC - **NOCT:** 45 degC ### Cell and construction - **Cell type:** Monocrystalline - **Cell technology:** PERC - **Cell count:** 120 ### Physical - **Length:** 1755 mm - **Width:** 1038 mm - **Thickness:** 35 mm - **Weight:** 19.5 kg - **Area:** 1.82 m2 - **Power density:** 203.1 Wp/m2 ### Warranty and degradation - **Product warranty:** 10 years - **Performance warranty:** 25 years - **Output guaranteed at end of warranty:** 80.2 % - **First-year degradation:** 3.50 % - **Annual degradation:** 0.70 % - **Output after 30 years:** 282 W ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 11769 of 14005 | | Power density | 11759 of 14005 | | Temperature coefficient | 13081 of 14005 | | Weight | 6344 of 14005 | | Warranty | 9798 of 14005 | ## Pros - **Proven half-cut + multi-busbar design** - Splitting PERC cells in half lowers operating current and resistive losses, while the multi-busbar grid reduces microcrack risk - a well-established combination for reliable mass-market series, without the premium of bifacial technology. - **Efficiency up to 20.9% - ahead of peer comparables** - The upper efficiency bound of 20.9% exceeds VDS-S120/M6H (20.8%), Gamko GKA166M120 (20.85%) and Heckert NeMo 3.0 120M (20%) at the same 360-380 Wp power range, making this series one of the more efficient options in its technology class. - **Tier-1 BNEF status and 20+ years in the market** - CSUN has operated since 2004 and has historically held Tier-1 status in the Bloomberg New Energy Finance ranking, indicating documented bankability - an important factor for financing commercial installations. - **Reinforced build for climatic loads** - A robust frame and glass with enhanced hail and snow-load resistance allow the series to serve both residential rooftop installations and larger commercial systems without needing specialized variants. - **Consistent, active product since 2021** - Launched in 2021 and still actively manufactured (discontinued: false), the series provides confidence in long-term availability of spare parts, service support, and compatible mounting components. ## Cons - **10-year product warranty below 2026 market trend** - The standard 10-year product warranty is now a baseline figure in the segment - many Tier-1 manufacturers (particularly with TOPCon lineups) already offer 12-15 years, making Mars Series relatively conservative on this point. - **PERC technology has reached its efficiency ceiling** - PERC has largely hit its technical efficiency ceiling (~21-23% at best implementations), while newer N-type TOPCon/HJT modules entering the market in 2026 offer lower LID/LeTID degradation and better high-temperature performance - the lack of such an option limits this series' long-term competitiveness against the latest offerings. - **No bifacial variant** - The series does not offer a bifacial option, so ground-mount installations or light-colored surfaces cannot capture additional albedo-driven yield available from competitors offering bifacial modules in the same power segment. ## About this series The Mars Half Cell series is built for installers and investors who need strong energy performance from a limited roof area. These modules rely on **half-cut cell technology** based on monocrystalline PERC cells, which cuts resistive losses and boosts energy yield compared to conventional full-cell panels. Splitting each cell in half means lower operating currents, resulting in reduced module heating and better performance under partial shading - a single scratch or leaf no longer knocks out an entire section of production. The **multi-busbar** design further lowers the risk of microcracks and improves long-term reliability. Mars series panels feature a robust, weather-resistant frame and a glass surface engineered to withstand hail impact and heavy snow loads, making them a versatile choice for both residential rooftop installations and larger commercial systems. This is a series for customers looking for a proven balance of **consistent performance**, durability, and reasonable cost, without paying a premium for bifacial or TOPCon technology. ## Notable figures - Efficiency of 20.3% is 0.9pp above the \*\*PERC 0-400W\*\* median (19.4%) - 203.1 W/m² power density - 8.7 W/m² more than \*\*PERC 0-400W\*\* median (194.4 W/m²), more power per roof area - At -0.37%/°C, hot weather performance is typical for \*\*PERC 0-400W\*\* panels - Weight of 19.5 kg is typical for \*\*PERC 0-400W\*\* panels - Ranked #11769 out of 14005 panels for efficiency in the database ## Questions ### How much power does the CSUN Mars Series Half Cell panel generate? Modules from the Mars Half Cell series reach a maximum power of up to 380 Wp. This is achieved through monocrystalline PERC half-cut cells, which reduce resistive losses and deliver higher energy yield than classic full-cell panels of similar dimensions. A typical 5-6 kWp residential installation usually requires around a dozen such modules. ### What warranty comes with CSUN Mars Half Cell panels? The manufacturer provides a 10-year product warranty and a 25-year power performance warranty. This means the panel is guaranteed to produce energy at a specified output level for a quarter century, while any material or manufacturing defects during the first decade are fully covered by CSUN's service warranty. ### How does half-cut technology in Mars panels differ from full-cell panels? In half-cut technology, PERC cells are cut in half, which lowers the operating current flowing through the module. This reduces heating and resistive losses while improving performance under partial shading - a leaf or a chimney's shadow no longer disables an entire section of the panel, as could happen with a traditional full-cell design. ### Are Mars Half Cell panels bifacial? No, the Mars Half Cell series consists of monofacial panels that generate energy only from the front side of the module. This is a deliberate trade-off - skipping the more expensive bifacial technology keeps the price lower while maintaining solid, stable output, making this series well suited for standard rooftop installations without rear-side illumination. ### Does the multi-busbar design in CSUN Mars panels improve durability? Yes, the multi-busbar design spreads current across more conductive paths, reducing the risk of cell micro-cracks and improving long-term reliability. Combined with half-cut cell technology and a weather-resistant reinforced frame, Mars panels better withstand mechanical stress, hail impact, and intense sun exposure. ### Are CSUN Mars Half Cell panels suitable for both commercial and residential installations? Yes, thanks to a sturdy frame, hail- and snow-load-resistant glass surface, and versatile electrical parameters, the Mars series works well on single-family home rooftops as well as larger commercial systems. As a Tier 1 manufacturer, CSUN ensures consistent production quality, making it easier to design installations of varying scale. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/CSUN380-120M-166-6464712641ec.pdf) ## Alternatives | Panel | Power | How it differs | | --- | --- | --- | | [JA Solar NS-330MH-80](https://comparepv.com/panel/ja-solar-ns-330mh-80) | 330 W | Cooler, lighter, +2.8 pp | | [PolyCrown Solar Tech NS-330MH-80](https://comparepv.com/panel/polycrown-solar-tech-ns-330mh-80) | 330 W | Cooler, lighter, +2.8 pp | | [Gamko New Energy GKA210M320W](https://comparepv.com/panel/gamko-new-energy-gka210m320w) | 320 W | -50 W, +2.7 pp, +5 yr warranty | | [Gamko New Energy GKA210M340W](https://comparepv.com/panel/gamko-new-energy-gka210m340w) | 340 W | Lighter, +2.7 pp, +5 yr warranty | | [Gamko New Energy GKA210M360W](https://comparepv.com/panel/gamko-new-energy-gka210m360w) | 360 W | Lighter, +2.7 pp, +5 yr warranty | | [Gamko New Energy GKA210M380W (1/4\*4\*38)](https://comparepv.com/panel/gamko-new-energy-gka210m380w-1-4-4-38) | 380 W | Lighter, +2.7 pp, +5 yr warranty | | [Gamko New Energy GKA210M400W (1/2\*4\*20)](https://comparepv.com/panel/gamko-new-energy-gka210m400w-1-2-4-20) | 400 W | +30 W, +2.7 pp, +5 yr warranty | | [Gamko New Energy GKA210M400W (1/4\*4\*40)](https://comparepv.com/panel/gamko-new-energy-gka210m400w-1-4-4-40) | 400 W | +30 W, +2.7 pp, +5 yr warranty | | [Gamko New Energy GKA210M380W (1/2\*4\*19)](https://comparepv.com/panel/gamko-new-energy-gka210m380w-1-2-4-19) | 380 W | Lighter, +2.7 pp, +5 yr warranty | | [Maxeon SPR-MAX3-400-COM](https://comparepv.com/panel/maxeon-spr-max3-400-com) | 400 W | Cooler, +2.3 pp, +15 yr warranty | | [CSUN CSUN360-120M](https://comparepv.com/panel/csun-csun360-120m) | 360 W | -10 W, -0.5 pp | | [CSUN CSUN365-120M](https://comparepv.com/panel/csun-csun365-120m) | 365 W | -0.3 pp | | [CSUN CSUN375-120M](https://comparepv.com/panel/csun-csun375-120m) | 375 W | +0.3 pp | | [CSUN CSUN380-120M](https://comparepv.com/panel/csun-csun380-120m) | 380 W | +10 W, +0.6 pp | | [Longi Solar LR7-54HJD-510M](https://comparepv.com/panel/longi-lr7-54hjd-510m) | 510 W | +140 W, cooler, +4.7 pp | | [AIKO AIKO-A495-MCE54Mw](https://comparepv.com/panel/aiko-aiko-a495-mce54mw) | 495 W | +125 W, cooler, +4.5 pp | --- Source: https://comparepv.com/panel/csun-csun370-120m Not in this file, on the page: a thirty-year output simulator and alternatives filtered by how closely they match these dimensions.