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Solar N Plus Brand review

SP-N16/108H420W

420 Wp TOPCon
ComparePV verdict

Middle of its segment, modest efficiency

Rank 10,198 of 14,005
Compare panels Datasheet PDF
Power (Wp)
420
Weak · bottom 16%
Efficiency (%)
21.50
Weak · bottom 17%
Density (Wp/m²)
215.1
Weak · bottom 19%
Temp (%/°C)
-0.290
Typical · median -0.290
Weight (kg)
21.0
Typical · median 22.0 kg
Warranty (yrs)
30
Typical · median 30 yrs

Solar N Plus SIRIUS photovoltaic panels set new standards in efficiency thanks to advanced N-type TOPCon cell technology, which effectively eliminates the problem of light-induced degradation. This series was designed to maximize energy yields even in low sunlight, which directly addresses the problem of unstable weather in the Polish climate. A key differentiator is the use of SMBB technology, which shortens the current flow path and minimizes the risk of micro-cracks, resulting in exceptional longevity for the entire installation. Thanks to a low temperature coefficient, the modules maintain high efficiency during summer heatwaves, outperforming standard older-type solutions. Bifacial versions allow for additional energy gain from radiation reflected off the ground, making them an ideal solution for large ground-mounted farms. The SIRIUS series is the optimal choice for business investors and single-family homeowners who prioritize a fast return on investment and decades of trouble-free operation. What distinguishes them from the competition is their exceptional resistance to extreme weather conditions and rigorous quality control, guaranteeing full repeatability of the parameters of each module. This is an advanced solution for those seeking a technological balance between innovation and real structural durability in harsh environments.

Ranking

1,218 panels in the segment TOPCon 400-450 W
Metric This panel Median Position in segment Overall rank
Module efficiency 21.50% 22.00% Weak · bottom 17% 7,958
Power density 215.1 220.2 Weak · bottom 19% 7,882
Temperature coefficient -0.290 -0.290 Typical 2,165
Weight per kWp 50.0 51.4 Typical 3,317
Performance warranty 30 yrs 30 yrs Typical 21
Colour key Strong - top 25% Typical - middle 50% Weak - bottom 25%

Signals from the data

0 positive · 2 caution
Best for

Residential, commercial and hot-climate.

Not ideal for

Tight roof space and roofs where every square metre has to count.

Watch-outs
21.50% module efficiency

Bottom 17% of the TOPCon 400-450 W segment, against a median of 22.00%.

215.1 watts per square metre

Bottom 19% of the TOPCon 400-450 W segment, against a median of 220.2.

Notes from the database
  • Efficiency of 21.5% matches the TOPCon 400-450W median
  • 215.1 W/m² power density is 5.1 W/m² below TOPCon 400-450W median (220.2 W/m²) - requires larger installation area
  • Temperature coefficient of -0.29%/°C matches the TOPCon 400-450W median
  • At 21.0 kg, weight matches the TOPCon 400-450W median
  • #7958 for efficiency, #2165 for temperature performance out of 14005 panels

Specifications

Open datasheet PDF
Nominal power (Pmax) 420 Wp Nameplate at 1000 W/m², 25 °C
Module efficiency 21.50 % Weak Segment median 22.00%
Vmpp · Impp 31.70 V · 13.25 A Operating point at max power
Voc · Isc 38.32 V · 14.00 A Sizes the string length
Max system voltage 1500 V Longer strings than 1000 V modules
Dimensions 1722×1134×30 mm · 1.95 m² of roof
Weight 21.0 kg Typical Typical · median 22.0 kg
Cells 108 · TOPCon Monocrystalline
Coefficient Pmax -0.290 %/°C Typical median -0.290 of its segment
Coefficient Voc · Isc -0.250 · 0.045 %/°C
NOCT 42 °C At 800 W/m², 20 °C ambient
Product warranty 15 years Hardware defects only
Performance warranty 30 years Typical median 30 yrs · median 30 yrs
End-of-warranty output 87.4 % Equals 367 W guaranteed
Degradation 1.00 → 0.40 % First year, then annual

Datasheet charts

Open datasheet PDF

Measured curves published by Solar N Plus in this model's datasheet. A chart carrying a wattage was measured on that variant alone - only the ones that describe 420 Wp appear here. The rest cover the whole series.

30-year linear power output warranty (degradation curve) 30-year linear power output warranty (degradation curve) Whole series

Simulations

Live - change any input
Lifetime output & value
30 years at 1200 kWh/kWp/year and €0.50 per kWh
Power in year 30
-
Lifetime energy
-
Energy value
-

Degradation from this panel's own datasheet figures. No inverter, soiling or shading losses.

Heat losses
-0.290 %/°C against a segment median of -0.290
-
Filter these
Size
Panel Power Eff. Temp. Weight Difference
Solar N Plus SP-N16/108H420W 420 W 21.50% -0.290 21.0 kg You are here
JST-EDMH-(445-465)W-TD (465W class) 465 W 23.81% -0.300 20.5 kg +45 W, hotter, +2.3 pp
LX-465M/182R-96+ GG 465 W 23.80% -0.260 23.5 kg +45 W, cooler, +2.3 pp
SPR-MAX7-470 470 W 23.70% -0.270 21.1 kg +50 W, +2.2 pp, +10 yr warranty
AIKO-A470-MAH54Mb 470 W 23.60% -0.260 21.5 kg +50 W, cooler, +2.1 pp
AIKO-A460-MAH54Mb 460 W 23.60% -0.290 20.5 kg +40 W, +2.1 pp
HSM-BD54-LA470 470 W 23.60% -0.260 21.5 kg +50 W, cooler, +2.1 pp
SP-M10/108HG-395 395 W 20.20% -0.350 24.1 kg Hotter, heavier, -1.3 pp
SP-M10/108HG-400 400 W 20.50% -0.350 24.1 kg Hotter, heavier, -1.0 pp
LR7-54HJD-510M 510 W 25.00% -0.240 23.5 kg +90 W, cooler, +3.5 pp
AIKO-A495-MCE54Mw 495 W 24.80% -0.260 21.0 kg +75 W, cooler, +3.3 pp
LR7-54HJD-505M 505 W 24.70% -0.240 23.5 kg +85 W, cooler, +3.2 pp
AIKO-A490-MCE54Mw 490 W 24.50% -0.260 21.0 kg +70 W, cooler, +3.0 pp
LR7-54HJD-500M 500 W 24.50% -0.240 23.5 kg +80 W, cooler, +3.0 pp
CIPRO-TN9C54M-500W 500 W 24.50% -0.260 21.4 kg +80 W, cooler, +3.0 pp

Found 1783 panels of the same or similar size to this one, within ±10 mm. See them here Found 1914 panels of the same or similar size to this one, within ±25 mm. See them here Found 3392 panels of the same or similar size to this one, within ±50 mm. See them here Found 3970 panels of the same or similar size to this one, within ±100 mm. See them here

Common questions

6 answered
What warranty does the Solar N Plus SIRIUS series come with?
The SIRIUS series carries a 15-year product warranty covering material and workmanship defects, along with a 30-year linear power output warranty. This means the manufacturer guarantees that module efficiency will stay at the declared level for three decades. It is one of the longer power warranties currently available on the market and a significant factor when calculating the total cost of ownership of a PV system.
What is TOPCon technology in the SIRIUS panels and is it worth the premium?
TOPCon (Tunnel Oxide Passivated Contact) is a next-generation N-type cell design that eliminates light-induced degradation (LID). In practice, a SIRIUS panel does not lose rated power after the first weeks of operation, which is a well-known drawback of older PERC cells. The higher upfront cost pays back faster through elevated annual energy yields, especially given the module's 420 Wp peak power rating.
Do Solar N Plus SIRIUS panels perform well under overcast skies and diffuse light conditions?
Yes. The N-type TOPCon cells used in the SIRIUS series have superior low-irradiance response compared to P-type PERC technology. This is especially relevant in Central European climates where overcast days are common. The modules generate power even under diffuse light, resulting in measurably higher annual energy yields compared to installations using older cell architectures.
What is SMBB technology in the SIRIUS panels and how does it affect long-term reliability?
SMBB (Super Multi Busbar) replaces a few wide busbars with many narrow ones, shortening the current path inside each cell and reducing resistive losses. The key reliability benefit is mechanical: reduced thermal stress on the cell surface significantly lowers the risk of microcracks developing over years of thermal cycling. For a system designed to operate for 30 years, this is a meaningful structural durability advantage.
Is the SIRIUS series available in a bifacial version?
The standard Solar N Plus SIRIUS module is not bifacial — it collects energy from the front surface only. If you are planning a ground-mounted installation with a reflective substrate and want to capture additional albedo energy, check with your distributor whether a bifacial variant exists within this series or consider another model from the Solar N Plus portfolio that supports bifacial gain.
How do SIRIUS panels handle summer heat — does high temperature significantly reduce their output?
The SIRIUS series features a low temperature coefficient, which is characteristic of N-type TOPCon cells. This means that as module temperature rises above the standard test condition of 25°C, the power drop is smaller than with conventional PERC panels. In real-world summer conditions, where module temperatures can reach 60–70°C, SIRIUS delivers measurably more power than legacy technology, with a positive impact on annual energy production totals.
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