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Vikram Solar PREXOS VSMDHT.66.655.05
Vikram Solar Brand review

PREXOS VSMDHT.66.655.05

655 Wp PERC Bifacial 70%
ComparePV verdict

Middle of its segment, weak in heat

Rank 4,101 of 14,129
Compare panels Datasheet PDF
Power (Wp)
655
Weak · bottom 25%
Efficiency (%)
21.09
Weak · bottom 22%
Density (Wp/m²)
210.9
Weak · bottom 24%
Temp (%/°C)
-0.350
Weak · bottom 10%
Weight (kg)
33.6
Typical · median 34.5 kg
Warranty (yrs)
27
Typical · median 30 yrs

The Vikram Solar PREXOS series consists of technologically advanced modules utilizing half-cut cell technology, which significantly reduces energy losses resulting from internal resistance and periodic shading. Thanks to the use of an innovative monocrystalline bifacial cell design, these panels generate electricity not only from direct sunlight but also from radiation reflected from the ground, making them an ideal solution for large ground-mounted farms and commercial installations. The use of multi-busbar connections minimizes the risk of micro-cracks and improves charge flow, which directly translates into higher efficiency in low sunlight conditions. The PREXOS series effectively solves the problem of limited installation space by offering impressive power density, which allows for significant optimization of system and cabling costs. What distinguishes these modules from the competition is their exceptional resistance to LID and LeTID degradation, as well as a reinforced frame prepared for extreme mechanical loads. By choosing the PREXOS series, investors receive a guarantee of stable energy yields over a very long time horizon, making it a solution dedicated to the most demanding photovoltaic projects focusing on reliability and a fast return on investment.

Ranking

320 panels in the segment PERC 650-700 W
Metric This panel Median Position in segment Overall rank
Module efficiency 21.09% 21.25% Weak · bottom 22% 9,587
Power density 210.9 212.5 Weak · bottom 24% 9,527
Temperature coefficient -0.350 -0.340 Weak · bottom 10% 10,489
Weight per kWp 51.3 52.3 Typical 4,706
Performance warranty 27 yrs 30 yrs Typical 9,781
Colour key Strong - top 25% Typical - middle 50% Weak - bottom 25%

Signals from the data

0 positive · 3 caution
Best for

Utility-scale, commercial and shaded-installations.

Not ideal for

Hot climates, tight roof space and roofs where every square metre has to count.

Watch-outs
-0.350 %/°C temperature coefficient

Bottom 10% of the PERC 650-700 W segment, against a median of -0.340.

21.09% module efficiency

Bottom 22% of the PERC 650-700 W segment, against a median of 21.25%.

210.9 watts per square metre

Bottom 24% of the PERC 650-700 W segment, against a median of 212.5.

Notes from the database
  • Efficiency of 21.1% matches the PERC 650-700W median
  • Power density of 210.9 W/m² matches the PERC 650-700W median
  • Temperature coefficient of -0.35%/°C matches the PERC 650-700W median
  • 70% bifaciality enables rear-side power generation, boosting yield by 4-10% on reflective surfaces
  • Ranked #9587 out of 14129 panels for efficiency in the database

Specifications

Open datasheet PDF
Nominal power (Pmax) 655 Wp Nameplate at 1000 W/m², 25 °C
Module efficiency 21.09 % Weak Segment median 21.25%
Vmpp · Impp 38.30 V · 17.12 A Operating point at max power
Voc · Isc 45.90 V · 17.93 A Sizes the string length
Max system voltage 1500 V Longer strings than 1000 V modules
Dimensions 2384×1303×35 mm · 3.11 m² of roof
Weight 33.6 kg Typical Typical · median 34.5 kg
Cells 132 · PERC Monocrystalline
Bifaciality 70 % Rear output as a share of front
Coefficient Pmax -0.350 %/°C Weak bottom 10% of its segment
Coefficient Voc · Isc -0.270 · 0.050 %/°C
NOCT 45 °C At 800 W/m², 20 °C ambient
Product warranty 12 years Hardware defects only
Performance warranty 27 years Typical median 30 yrs · median 30 yrs
End-of-warranty output 83.7 % Equals 537 W guaranteed
Degradation 2.00 → 0.55 % First year, then annual

Datasheet charts

Open datasheet PDF

Measured curves published by Vikram Solar in this model's datasheet. A chart carrying a wattage was measured on that variant alone - only the ones that describe 655 Wp appear here. The rest cover the whole series.

Performance Warranty Performance Warranty 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
-
With bifacial gain
-

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

Heat losses
-0.350 %/°C against a segment median of -0.340
-
Bifacial gain
Rear gain over light concrete: -
-

Model: bifaciality × albedo × 0.6 view factor. A first-order estimate, not a yield simulation.

Filter these
Size
Panel Power Eff. Temp. Weight Difference
Vikram Solar PREXOS VSMDHT.66.655.05 655 W 21.09% -0.350 33.6 kg You are here
AIKO-A650-MAE72Mw 650 W 25.20% -0.260 27.0 kg Cooler, lighter, +4.1 pp
AIKO-A680-MDE72Mw 680 W 25.20% -0.260 29.0 kg Cooler, lighter, +4.1 pp
AIKO-A675-MDE72Mw 675 W 25.00% -0.260 29.0 kg Cooler, lighter, +3.9 pp
AIKO-A645-MAE72Mw 645 W 25.00% -0.260 27.0 kg Cooler, lighter, +3.9 pp
AIKO-A700-MAE78Dw 700 W 25.00% -0.260 34.5 kg +45 W, cooler, +3.9 pp
WST-675BKX72-A2 675 W 25.00% -0.260 32.1 kg Cooler, +3.9 pp, +3 yr warranty
AIKO-A695-MAE78Dw 695 W 24.90% -0.260 34.5 kg +40 W, cooler, +3.8 pp
AIKO-G670-MCH72Mw 670 W 24.80% -0.260 28.2 kg Cooler, lighter, +3.7 pp
PARADEA VSMDH.66.AAA.05-660 660 W 21.25% -0.350 39.5 kg Heavier, +3 yr warranty
PARADEA VSMDH.66.AAA.05-665 665 W 21.41% -0.350 39.5 kg Heavier, +0.3 pp, +3 yr warranty
AIKO-A805-GRH78Dw 805 W 25.10% -0.260 39.8 kg +150 W, cooler, +4.0 pp
AIKO-A800-GRH78Dw 800 W 24.90% -0.260 39.8 kg +145 W, cooler, +3.8 pp
AIKO-A795-GRH78Dw 795 W 24.80% -0.260 39.8 kg +140 W, cooler, +3.7 pp
AIKO-A790-GRH78Dw 790 W 24.60% -0.260 39.8 kg +135 W, cooler, +3.5 pp
TSM-NEG21C.20Q-760 760 W 24.50% -0.260 38.3 kg +105 W, cooler, +3.4 pp
AIKO-A785-GRH78Dw 785 W 24.40% -0.260 39.8 kg +130 W, cooler, +3.3 pp

Found 1393 panels of the same or similar size to this one, within ±10 mm. See them here Found 1403 panels of the same or similar size to this one, within ±25 mm. See them here Found 1403 panels of the same or similar size to this one, within ±50 mm. See them here Found 1435 panels of the same or similar size to this one, within ±100 mm. See them here

About the PREXOS series

6 answered

These answers cover the whole series. Where a figure differs, the specification above is this module's own.

Is the Vikram Solar PREXOS series still available for purchase?
The manufacturer has discontinued the PREXOS series, replacing it in the current lineup with newer solutions such as the Paradea series. PREXOS modules may still be found through distributors selling remaining warehouse stock, but availability is limited and shrinking over time. Buyers should confirm stock of the specific power rating and the validity of the manufacturer warranty before purchasing.
What are the benefits of the half-cut cell technology used in PREXOS?
Splitting each cell in half reduces internal resistance and resistive losses, resulting in higher energy yield, especially under partial shading such as from a chimney or antenna. The smaller cell segments are also more resistant to microcracks, improving the panel's durability during handling, transport, and installation in demanding conditions.
What warranty does Vikram Solar offer on the PREXOS series?
The PREXOS series comes with a 12-year product warranty covering material and workmanship defects, plus a 27-year linear power warranty guaranteeing a defined percentage of initial output throughout that period. This is one of the longer warranty periods offered by tier-1 manufacturers, which matters when calculating return on investment for larger installations.
Do PREXOS bifacial panels make sense for ground-mounted installations?
Yes, the bifacial design with monocrystalline PERC cells captures additional energy from light reflected off the ground, which is especially beneficial for ground-mounted systems on light, reflective surfaces such as gravel or white membrane. This extra rear-side energy gain can meaningfully increase total output compared to monofacial modules in a solar farm.
What type of installation suits a 680 Wp PREXOS panel?
The 680 Wp output and high power density make the PREXOS series well suited to large commercial installations and solar farms, where fewer panels are needed to reach a target capacity, reducing costs for mounting structures, cabling, and installation labor. It's a design optimized for limited roof or ground space while maintaining high performance.
Is Vikram Solar a reliable manufacturer, and where is it based?
Vikram Solar is an Indian solar module manufacturer classified as a tier-1 supplier, indicating recognized financial stability and bankability for projects using its panels. The PREXOS series was also known for strong resistance to LID and LeTID degradation and a reinforced frame, making it a trusted choice for investors seeking stable energy yields over the long term.
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