--- title: "Solar N Plus CN4-620W 620W Solar Panel - Specs & Review | ComparePV" description: "Solar N Plus CN4-620W 620W solar panel. Specs: 22.18% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/solar-n-plus-cn4-620w" updated: 2026-09-11 --- # Solar N Plus CN4-620W Middle of its segment, heavy for its output 359 panels in the segment N-type 600-650 W ## Identity - **Manufacturer:** Solar N Plus - **Model:** CN4-620W - **Series:** CN4 - **Rated power:** 620 W - **Cell technology:** N-type - **Bifacial:** yes ## How it compares Compared against segment N-type 600-650 W (359 panels). | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Power (Wp) | 620 W | 625 W | Typical | | | Module efficiency | 22.18% | 22.77% | Weak - bottom 12% | 5,930 | | Power density | 221.8 | 227.7 | Weak - bottom 13% | 5,869 | | Temperature coefficient | -0.290 | -0.290 | Typical | 2,165 | | Weight (kg) | 37.3 kg | 32.5 kg | Weak - bottom 5% | | | Performance warranty | - | 30 yrs | | | ### Full peer table | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Module efficiency | 22.18% | 22.77% | Weak - bottom 12% | 5,930 | | Power density | 221.8 | 227.7 | Weak - bottom 13% | 5,869 | | Temperature coefficient | -0.290 | -0.290 | Typical | 2,165 | | Weight per kWp | 60.2 | 52.7 | Weak - bottom 5% | 12,376 | | Performance warranty | - | 30 yrs | | | ### Watch out for - **60.2 kg per kWp** - Bottom 5% of the N-type 600-650 W segment, against a median of 52.7. Ranked 12,376th in the whole database. - **22.18% module efficiency** - Bottom 12% of the N-type 600-650 W segment, against a median of 22.77%. - **221.8 watts per square metre** - Bottom 13% of the N-type 600-650 W segment, against a median of 227.7. - **Best for:** Utility-scale, commercial and hot-climate. - **Not ideal for:** Weight-limited structures, tight roof space and roofs where every square metre has to count. ## Specification ### Electrical - **Rated power (Pmax):** 620 W - **Efficiency:** 22.18 % - **Voltage at Pmax (Vmp):** 47.88 V - **Current at Pmax (Imp):** 12.95 A - **Open-circuit voltage (Voc):** 55.66 V - **Short-circuit current (Isc):** 13.55 A - **Max system voltage:** 1500 V ### Temperature - **Temperature coefficient of Pmax:** -0.290 %/degC - **Temperature coefficient of Voc:** -0.250 %/degC - **Temperature coefficient of Isc:** 0.045 %/degC - **NOCT:** 42 degC ### Cell and construction - **Cell type:** Monocrystalline - **Cell technology:** N-type - **Cell count:** 156 - **Bifacial:** yes ### Physical - **Length:** 2465 mm - **Width:** 1134 mm - **Thickness:** 30 mm - **Weight:** 37.3 kg - **Area:** 2.80 m2 - **Power density:** 221.8 Wp/m2 ### Warranty and degradation ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 5930 of 14005 | | Power density | 5869 of 14005 | | Temperature coefficient | 2165 of 14005 | | Weight | 12376 of 14005 | | Warranty | 13880 of 14005 | ## About this series The Solar N Plus CN4 series is designed to maximize energy yield from the same surface area - particularly in situations where every square meter of roof space or limited mounting points are crucial. Its key advantage lies in the use of **N-type cells in TOPCon technology**, which maintain their efficiency over time and are less susceptible to typical losses seen in older systems (e.g., light- or potential-induced degradation). This translates to more stable energy production and a more predictable return on investment. The CN4 series also features **low temperature sensitivity**, which helps maintain higher performance on hot days when many modules lose the most energy. The materials and construction also support **PID and LID resistance**, and in selected variants, it offers **bifacial and dual-sided construction**, which is useful for flat roofs and ground-mounted installations. This is a series for investors who want to increase energy yield without increasing the size of their installation and are looking for a technology that genuinely improves the energy balance of their system. ## Notable figures - Module efficiency of 22.2% is 0.6pp below average for \*\*N-type 600-650W\*\* panels (median: 22.8%) - At 221.8 W/m², this panel generates 5.9 W/m² less per unit area than \*\*N-type 600-650W\*\* median (227.7 W/m²) - Temperature coefficient of -0.29%/°C matches the \*\*N-type 600-650W\*\* median - Weight of 37.3 kg is 4.8 kg above \*\*N-type 600-650W\*\* median (32.5 kg) - verify structural support - 80% bifaciality enables rear-side power generation, boosting yield by 4-12% on reflective surfaces ## Questions ### Is the Solar N Plus CN4 series still available for purchase? The CN4 series has been discontinued and is no longer actively offered by the manufacturer. If you need N-type TOPCon technology with similar specs (up to 625 Wp, bifacial cells), consider newer series from this or other manufacturers. Some distributors may still have remaining stock, so check availability before writing off this option entirely. ### What is TOPCon technology and why are the N-type cells in the CN4 series better than PERC? TOPCon (Tunnel Oxide Passivated Contact) is an N-type cell technology that uses a thin silicon oxide layer to reduce electron recombination and boost efficiency. In practical terms, N-type cells in the CN4 are significantly less prone to LID (Light Induced Degradation) and PID (Potential Induced Degradation) than standard P-type PERC modules. This results in lower annual power loss and more predictable energy yield over the system's lifetime. ### Does the Solar N Plus CN4 625 Wp panel perform well on hot days? Yes. The CN4 series features a low temperature coefficient of approximately -0.29%/°C, typical for N-type TOPCon cells. Standard PERC modules lose around -0.35%/°C. When a panel heats up to 70°C, the CN4 retains several percentage points more output — a measurable advantage that adds up to a meaningful energy gain over a full year of operation. ### When does it make sense to choose the bifacial dual-glass CN4 variant? The bifacial dual-glass CN4 variant is most beneficial on flat roofs and ground-mount installations where the rear side can capture reflected irradiance from light-colored surfaces, gravel, or snow. On a typical sloped roof with dark shingles, the bifacial gain is negligible. The dual-glass construction also provides superior moisture resistance and improved mechanical durability compared to standard backsheet modules. ### What inverter should I pair with Solar N Plus CN4 625 Wp modules? With a module power of 625 Wp and open-circuit voltage typical for this power class (around 45–50 V per module), your inverter must have an MPPT voltage range and maximum DC input voltage that safely cover the string voltage at -10°C. For residential installs, standard string inverters with wide MPPT ranges work well; for ground-mount systems, consider high-power string or central inverters. Always verify compatibility against the inverter's technical datasheet. ### What warranty did Solar N Plus offer for the CN4 series? Solar N Plus warranted its N-type modules with a 15-year product warranty (covering material and manufacturing defects) and a 30-year linear power warranty with annual degradation below 0.4%. Since the CN4 is discontinued, verify the exact warranty terms and ongoing support availability with your distributor, as coverage may depend on the original purchase agreement. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/cn4-620-625w-jp2025v1-1-1-0f751999b0b0.pdf) ## Alternatives | Panel | Power | How it differs | | --- | --- | --- | | [AIKO AIKO-A650-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a650-mae72mw) | 650 W | +30 W, lighter, +3.0 pp | | [AIKO AIKO-A645-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a645-mae72mw) | 645 W | Cooler, lighter, +2.8 pp | | [AIKO AIKO-G670-MCH72Mw](https://comparepv.com/panel/aiko-aiko-g670-mch72mw) | 670 W | +50 W, lighter, +2.6 pp | | [Longi Solar LR7-72HVHF-670M](https://comparepv.com/panel/longi-lr7-72hvhf-670m) | 670 W | +50 W, lighter, +2.6 pp | | [AIKO AIKO-A640-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a640-mae72mw) | 640 W | Cooler, lighter, +2.6 pp | | [Jinko Solar JKM650-670N-66QL6-BDV (670W class)](https://comparepv.com/panel/jinko-solar-jkm650-670n-66ql6-bdv-670w-class) | 670 W | +50 W, lighter, +2.6 pp | | [Solar N Plus CN4-625W](https://comparepv.com/panel/solar-n-plus-cn4-625w) | 625 W | Very close match | | [Solar N Plus SP-N16/156HG-630W](https://comparepv.com/panel/solar-n-plus-sp-n16-156hg-630w) | 630 W | +10 W, lighter, +0.3 pp | | [Solar N Plus SP-N16/156HG-635W](https://comparepv.com/panel/solar-n-plus-sp-n16-156hg-635w) | 635 W | +15 W, lighter, +0.5 pp | | [Solar N Plus SP-N16/156HG-640W](https://comparepv.com/panel/solar-n-plus-sp-n16-156hg-640w) | 640 W | +20 W, lighter, +0.7 pp | | [Solar N Plus SP-N16/156HG-645W](https://comparepv.com/panel/solar-n-plus-sp-n16-156hg-645w) | 645 W | +25 W, lighter, +0.9 pp | | [AIKO AIKO-A680-MDE72Mw](https://comparepv.com/panel/aiko-aiko-a680-mde72mw) | 680 W | +60 W, lighter, +3.0 pp | | [AIKO AIKO-A675-MDE72Mw](https://comparepv.com/panel/aiko-aiko-a675-mde72mw) | 675 W | +55 W, lighter, +2.8 pp | | [AIKO AIKO-A700-MAE78Dw](https://comparepv.com/panel/aiko-aiko-a700-mae78dw) | 700 W | +80 W, cooler, +2.8 pp | | [AIKO AIKO-A695-MAE78Dw](https://comparepv.com/panel/aiko-aiko-a695-mae78dw) | 695 W | +75 W, cooler, +2.7 pp | --- Source: https://comparepv.com/panel/solar-n-plus-cn4-620w Not in this file, on the page: a thirty-year output simulator, a bifacial gain calculator and alternatives filtered by how closely they match these dimensions.