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Solarwatt Brand review

SOLARWATT Panel vision AM 4.0 pure

405 Wp PERC Bifacial
ComparePV verdict

Strong in heat, heavy for its output

Rank 9,111 of 14,005
Compare panels Datasheet PDF
Power (Wp)
405
Typical for its class
Efficiency (%)
20.70
Typical · median 20.60%
Density (Wp/m²)
207.4
Typical · median 206.2
Temp (%/°C)
-0.330
Strong · top 10%
Weight (kg)
25.4
Weak · 3.4 kg above median
Warranty (yrs)
30
Strong · top 17%

The Solarwatt SOLARWATT Panel vision AM 4.0 pure series consists of glass-glass modules designed for maximum durability and stable operation for many years. The use of glass-glass laminate provides exceptional protection against moisture, microcracks, and mechanical loads - which realistically reduces the risk of yield losses over time and limits maintenance issues on the roof.

This series utilizes monocrystalline cells in a half-cut configuration, which helps to better cope with partial shading and increases resistance to losses in typical home installation conditions. An additional advantage is the PERC bifacial technology, which can also benefit from reflected light - especially on bright roofs, terraces, and ground-mounted structures.

This is a good choice for investors who expect predictable energy production, high weather resistance, and long-term purchase security, supported by long product and performance warranties.

Ranking

954 panels in the segment PERC 400-450 W
Metric This panel Median Position in segment Overall rank
Module efficiency 20.70% 20.60% Typical 10,764
Power density 207.4 206.2 Typical 10,626
Temperature coefficient -0.330 -0.350 Strong · top 10% 8,545
Weight per kWp 62.7 53.0 Weak · bottom 5% 12,814
Performance warranty 30 yrs 25 yrs Strong · top 17% 21
Colour key Strong - top 25% Typical - middle 50% Weak - bottom 25%

Signals from the data

2 positive · 1 caution
Best for

Residential and shaded-installations.

Not ideal for

Weight-limited structures.

Strengths
-0.330 %/°C temperature coefficient

Top 10% of the PERC 400-450 W segment, against a median of -0.350.

30 year performance warranty

Top 17% of the PERC 400-450 W segment, against a median of 25 yrs.

Watch-outs
62.7 kg per kWp

Bottom 5% of the PERC 400-450 W segment, against a median of 53.0. Ranked 12,814th in the whole database.

Notes from the database
  • Efficiency of 20.7% matches the PERC 400-450W median
  • Power density of 207.4 W/m² matches the PERC 400-450W median
  • Temperature coefficient of -0.33%/°C matches the PERC 400-450W median
  • Weight of 25.4 kg is 3.4 kg above PERC 400-450W median (22.0 kg) - verify structural support
  • In the top 77% for efficiency among all PERC panels

Specifications

Open datasheet PDF
Nominal power (Pmax) 405 Wp Nameplate at 1000 W/m², 25 °C
Module efficiency 20.70 % Typical Segment median 20.60%
Vmpp · Impp 30.90 V · 13.10 A Operating point at max power
Voc · Isc 37.20 V · 14.00 A Sizes the string length
Max system voltage 1500 V Longer strings than 1000 V modules
Dimensions 1722×1134×35 mm · 1.95 m² of roof
Weight 25.4 kg Weak Weak · 3.4 kg above median
Cells 108 · PERC Monocrystalline
Coefficient Pmax -0.330 %/°C Strong top 10% of its segment
Coefficient Voc · Isc -0.250 · 0.050 %/°C
NOCT 44 °C At 800 W/m², 20 °C ambient
Product warranty 30 years Hardware defects only
Performance warranty 30 years Strong top 17% · median 25 yrs
End-of-warranty output 87.0 % Equals 352 W guaranteed

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
-0.330 %/°C against a segment median of -0.350
-

Alternatives

All Solarwatt panels
Filter these
Size
Panel Power Eff. Temp. Weight Difference
Solarwatt SOLARWATT Panel vision AM 4.0 pure 405 W 20.70% -0.330 25.4 kg You are here
AIKO-455-MAH54Db 455 W 23.30% -0.260 24.0 kg +50 W, cooler, +2.6 pp
LR5-54HTH-455M 455 W 23.30% -0.290 20.8 kg +50 W, +2.6 pp, -5 yr warranty
YL455CF54 e/2 455 W 23.30% -0.290 20.3 kg +50 W, lighter, +2.6 pp
ESM-455T 455 W 23.30% -0.310 21.0 kg +50 W, lighter, +2.6 pp
SE5-54HBC-455W 455 W 23.30% -0.290 20.8 kg +50 W, +2.6 pp, -5 yr warranty
JST-EDMH-(445-465)W-TD (455W class) 455 W 23.30% -0.300 20.5 kg +50 W, lighter, +2.6 pp
LX-455M/182R-96+ GG 455 W 23.30% -0.260 23.5 kg +50 W, cooler, +2.6 pp
SOLARWATT Panel vision AM 4.0 black (400 Wp variant) 400 W 20.50% -0.330 25.4 kg Very close match
LR7-54HJD-510M 510 W 25.00% -0.240 23.5 kg +105 W, cooler, +4.3 pp
AIKO-A495-MCE54Mw 495 W 24.80% -0.260 21.0 kg +90 W, cooler, +4.1 pp
LR7-54HJD-505M 505 W 24.70% -0.240 23.5 kg +100 W, cooler, +4.0 pp
AIKO-A490-MCE54Mw 490 W 24.50% -0.260 21.0 kg +85 W, cooler, +3.8 pp
LR7-54HJD-500M 500 W 24.50% -0.240 23.5 kg +95 W, cooler, +3.8 pp
CIPRO-TN9C54M-500W 500 W 24.50% -0.260 21.4 kg +95 W, cooler, +3.8 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
Is the SOLARWATT Panel vision AM 4.0 pure series still available for purchase?
The SOLARWATT Panel vision AM 4.0 pure series has been discontinued and is no longer actively offered by the manufacturer. If you need similar specifications, the newer AM 4.5 series continues the glass-glass technology with improved efficiency. Limited stock may still be available through authorized distributors, so it is worth checking with local resellers.
What warranty does the SOLARWATT Panel vision AM 4.0 pure come with?
The manufacturer provided a 30-year product warranty and a 30-year power output warranty. This is among the longest warranty standards available in the residential PV module market. After 30 years, panels are expected to maintain the power level specified in the manufacturer's degradation curve. Installation by a certified installer is required to keep the warranty valid.
How does bifacial technology work in the SOLARWATT Panel vision AM 4.0 pure and is it worth the extra cost?
Bifacial technology means the module can generate electricity from both its front side and its rear glass, capturing light reflected from the ground or rooftop surface. Combined with the glass-glass laminate of the AM 4.0 pure, the rear side is fully transparent. Real-world bifacial gain depends on the albedo of the surface below — white gravel, light-colored membranes, or snow produce the greatest benefit. On a typical dark pitched roof the additional yield may be modest.
What is the peak power of the SOLARWATT Panel vision AM 4.0 pure and how competitive is 405 Wp?
The module's peak power is 405 Wp, achieved with PERC half-cut monocrystalline cells at approximately 20.7% efficiency — a strong result for the generation at which this series was launched. A typical 6 kWp residential system requires 15 panels of this rating. Current market offerings exceed 430–450 Wp per module, yet the AM 4.0 pure still delivers competitive power density for roof areas with limited space.
Are SOLARWATT Panel vision AM 4.0 pure modules suitable for pitched roofs with partial shading?
Yes. The half-cut monocrystalline cell layout reduces the impact of partial shading from chimneys, dormers, or antennas on the overall string output. Each half-cell operates semi-independently, so shading one section of the module does not fully block the other half. The glass-glass laminate also provides additional protection against the mechanical stress and micro-cracking commonly seen on pitched roof installations.
Is SOLARWATT a German manufacturer and does that matter for the quality of the AM 4.0 pure panels?
Yes, SOLARWATT is headquartered in Dresden, Germany, and is one of the few remaining European PV module manufacturers with a long market track record. While the AM 4.0 pure series is not listed on the Bloomberg NEF Tier 1 ranking, the brand is recognized for rigorous quality control and its own extended warranty standards. For buyers who value European origin and local service support, this can be a meaningful differentiator.
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