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MWG Brand review

MWG-340M

340 Wp Monocrystalline
ComparePV verdict

Middle of its segment, weak in heat

Rank 13,047 of 14,005
Compare panels Datasheet PDF
Power (Wp)
340
Weak · bottom 17%
Efficiency (%)
20.12
Typical · median 20.50%
Density (Wp/m²)
201.3
Typical · median 204.8
Temp (%/°C)
-0.390
Weak · bottom 6%
Weight (kg)
19.0
Typical · median 21.5 kg
Warranty (yrs)
25
Typical · median 25 yrs

The MWG Mono series by MW Green Power comprises photovoltaic modules built on a monocrystalline structure, distinguished by high long-term stability and robust construction suited for both stationary and off-grid installations. The low-iron, UV-resistant tempered glass effectively protects the cells against degradation caused by solar radiation and adverse weather conditions, directly translating into the durability of the entire installation. The modules are covered by an extensive warranty package - 5/10/25-year warranty - guaranteeing at least 90% power retention during the first decade and 80% over the following years of operation. The frame, made of anodized aluminum alloy, facilitates installation and ensures mechanical resistance even under demanding conditions. The series works excellently with MPPT charge controllers, enabling maximum utilization of available solar energy. The ability to connect modules in series and parallel gives installers considerable design flexibility. This solution is aimed primarily at off-grid power systems, mini power plants, and power supply for electronic systems - applications where reliability and proven quality, backed by IEC, TUV, and CE certifications, are essential.

Ranking

3,730 panels in the 240-440 W band, all technologies
Metric This panel Median Position in segment Overall rank
Module efficiency 20.12% 20.50% Typical 12,098
Power density 201.3 204.8 Typical 12,092
Temperature coefficient -0.390 -0.340 Weak · bottom 6% 13,579
Weight per kWp 55.9 55.0 Typical 10,244
Performance warranty 25 yrs 25 yrs Typical 9,798
Colour key Strong - top 25% Typical - middle 50% Weak - bottom 25%

Signals from the data

4 positive · 5 caution
Best for

Off-grid and residential.

Not ideal for

Hot climates.

Watch-outs
-0.390 %/°C temperature coefficient

Bottom 6% of the 240-440 W band, against a median of -0.340. Ranked 13,579th in the whole database.

What owners get
Robust mechanical build

Low-iron, UV-resistant tempered glass combined with an anodized aluminum alloy frame delivers strong mechanical durability and limits cell degradation from solar exposure, which matters for installations facing harsh weather conditions.

Extensive 25-year warranty package

The 25-year power warranty guaranteeing at least 90% output through the first decade and 80% thereafter is comparable to Tier-1 manufacturer offerings, and is further backed by IEC, TUV, and CE certifications.

MPPT-friendly installation flexibility

Full compatibility with MPPT charge controllers plus support for series and parallel wiring makes this series convenient for designing off-grid systems, mini power plants, and electronics power supplies.

Competitive monocrystalline efficiency

Efficiency of 19.32-20.12% clearly outperforms the comparable DMEGC GH400M10T-B48HST (15.48%) and sits close to the Heliene 108HC M10 SL All Black (20.5%) at the same 400 Wp maximum power.

Trade-offs
Series discontinued

MWG Mono has been discontinued, meaning limited availability of warranty service, spare parts, and difficulty sourcing matching modules to extend existing installations in the future.

Not a Tier-1 (BNEF) manufacturer

MW Green Power does not appear on BloombergNEF's Tier-1 bankable manufacturer list, unlike comparable brands such as Heliene or Meyer Burger, which can complicate bank financing for larger commercial projects.

Short product warranty on base variant

Product warranty ranges from 5 to 10 years depending on the variant - the 5-year lower bound is clearly below the current market standard for mono modules, where premium manufacturers typically offer 10-15 years on manufacturing defects.

Efficiency below premium HJT segment

Maximum efficiency of 20.12% trails heterojunction-based modules such as the Meyer Burger White (21.7% at the same 400 Wp power), translating to lower energy yield for a comparable installation area.

Notes from the database
  • At 20.1% efficiency, this panel is 1.7pp below the database median of 21.8%
  • At 201.3 W/m², this panel generates 16.8 W/m² less per unit area than database median (218.1 W/m²)
  • -0.39%/°C temperature coefficient - 0.09pp worse than database median (-0.30%/°C), expect higher hot weather losses
  • At 19.0 kg, this panel is 7.5 kg lighter than database median (26.5 kg) - easier handling during installation
  • In the top 86% for efficiency among all N-type panels

Specifications

Open datasheet PDF
Nominal power (Pmax) 340 Wp Nameplate at 1000 W/m², 25 °C
Module efficiency 20.12 % Typical Segment median 20.50%
Vmpp · Impp 34.22 V · 9.94 A Operating point at max power
Voc · Isc 40.62 V · 10.87 A Sizes the string length
Max system voltage 1000 V Longer strings than 1000 V modules
Dimensions 1686×1002×35 mm · 1.69 m² of roof
Weight 19.0 kg Typical Typical · median 21.5 kg
Coefficient Pmax -0.390 %/°C Weak bottom 6% of its segment
Coefficient Voc · Isc -0.290 · 0.050 %/°C
NOCT 45 °C At 800 W/m², 20 °C ambient
Product warranty 5 years Hardware defects only
Performance warranty 25 years Typical median 25 yrs · median 25 yrs
End-of-warranty output 80.0 % Equals 260 W guaranteed
Degradation 2.50 → 0.73 % First year, then annual

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
-0.390 %/°C against a segment median of -0.340
-
Filter these
Size
Panel Power Eff. Temp. Weight Difference
MWG MWG-340M 340 W 20.12% -0.390 19.0 kg You are here
NS-300MH-72 300 W 23.32% -0.290 12.5 kg Cooler, lighter, +3.2 pp
NS-300MH-72 300 W 23.32% -0.290 12.5 kg Cooler, lighter, +3.2 pp
NS-330MH-80 330 W 23.15% -0.290 15.0 kg Cooler, lighter, +3.0 pp
NS-330MH-80 330 W 23.15% -0.290 15.0 kg Cooler, lighter, +3.0 pp
GKA182M300W 300 W 23.00% - 16.2 kg -40 W, +2.9 pp, +5 yr warranty
GKA210M320W 320 W 23.00% - 16.2 kg Lighter, +2.9 pp, +5 yr warranty
GKA210M340W 340 W 23.00% - 16.2 kg Lighter, +2.9 pp, +5 yr warranty
GKA210M360W 360 W 23.00% - 16.2 kg Lighter, +2.9 pp, +5 yr warranty
GKA210M380W (1/4*4*38) 380 W 23.00% - 17.1 kg +40 W, +2.9 pp, +5 yr warranty
GKA210M380W (1/2*4*19) 380 W 23.00% - 17.1 kg +40 W, +2.9 pp, +5 yr warranty
JT440SYK(B) 440 W 22.90% -0.240 23.0 kg +100 W, cooler, +2.8 pp
JT435SYk(B) 435 W 22.70% -0.240 23.0 kg +95 W, cooler, +2.6 pp
SPR-MAX3-400-COM 400 W 22.60% -0.270 19.0 kg Cooler, +2.5 pp, +15 yr warranty
JT430SYk(B) 430 W 22.40% -0.240 23.0 kg +90 W, cooler, +2.3 pp
LEPV 400 400 W 22.31% -0.290 20.0 kg +60 W, cooler, +2.2 pp
NS-360MH-60 360 W 22.12% -0.290 17.0 kg +20 W, cooler, +2.0 pp

Found 90 panels of the same or similar size to this one, within ±10 mm. See them here Found 226 panels of the same or similar size to this one, within ±25 mm. See them here Found 455 panels of the same or similar size to this one, within ±50 mm. See them here Found 799 panels of the same or similar size to this one, within ±100 mm. See them here

Common questions

6 answered
Is the MWG Mono series still available for purchase?
The MWG Mono series by MW Green Power has been discontinued and is no longer actively sold through standard distribution channels. If you need to expand an existing installation or are looking for a replacement, we recommend contacting a distributor directly to check remaining stock or to identify a suitable alternative from the manufacturer's current lineup.
What warranty does the MWG Mono panel come with, and what does it cover?
MWG Mono modules carry a 10-year product warranty and a 25-year linear power output warranty. The manufacturer guarantees at least 90% of rated power during the first decade of operation, and no less than 80% in subsequent years. This is a competitive warranty package for monocrystalline modules in this class, backed by IEC, TUV, and CE certifications.
What systems are MWG Mono 400 Wp panels best suited for?
MWG Mono modules are designed primarily for off-grid autonomous power systems, small-scale PV plants, and installations powering electronic equipment or industrial devices. Their compatibility with MPPT charge controllers ensures maximum energy harvest, making them a practical choice wherever grid access is limited or unavailable.
Do MWG Mono panels feature UV-resistant glass, and does it really affect long-term durability?
Yes, MWG Mono modules use low-iron tempered glass with a UV-resistant coating. This construction significantly reduces cell degradation caused by prolonged solar exposure and harsh weather conditions. In practice, it results in a slower efficiency decline and a longer service life compared to modules using standard glass without a UV barrier.
Can MWG Mono panels be connected in series and parallel configurations when designing an installation?
Yes, the MWG Mono series supports both series connections to increase string voltage and parallel connections to increase current. This gives installers considerable design flexibility when building systems of varying power and configuration. Panel count should always be matched to the voltage and current operating range of the MPPT controller or inverter used.
How do MWG Mono monocrystalline modules differ from polycrystalline panels?
The MWG Mono series uses a monocrystalline cell structure, which delivers higher efficiency and better long-term stability compared to polycrystalline cells. Monocrystalline cells produce more power per unit area, which matters when mounting space is limited. Overall build quality is confirmed by IEC, TUV, and CE certifications covering the entire series.
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