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535 vs 645 8 of 19 identical Swap Change panels

Waaree WSMD-535 vs Waaree WSMD-645

Waaree WSMD-535
WSMD-535
535 Wp 20.78 % PERC
Open panel page Datasheet PDF
VS
Waaree WSMD-645
WSMD-645
645 Wp 20.65 % PERC
Open panel page Datasheet PDF
The verdict

11 differences, and they point both ways

The largest is rated power: 110 W more power. 8 of 19 comparable parameters are identical.

See all 11 differences
How alike are they
8 of 19 comparable
parameters are identical
identical differs
01

What actually differs

11 of 19 parameters
Parameter 535 645 Difference
Rated power 535 Wp 645 Wp 110 W more power
Weight 27.5 kg 34.5 kg 7.0 kg lighter
Short-circuit current 13.76 A 17.78 A 4.02 A apart
Module area 2.574 m² 3.125 m² 0.551 m² apart
Open-circuit voltage 49.46 V 45.94 V 3.52 V apart
Temperature coefficient -0.350 %/°C -0.340 %/°C 0.010 %/°C better in heat
Current at max power 12.88 A 17.04 A 4.16 A apart
Cell count 144 132 12 cells apart
Voltage at max power 41.60 V 37.87 V 3.73 V apart
Weight per kWp 51.4 kg/kWp 53.5 kg/kWp 2.1 kg/kWp lighter
Dimensions 2272x1133x35 mm 2400x1302x35 mm 2272x1133x35 mm vs 2400x1302x35 mm
02

What it means on a roof

Thirty years of production
Each panel's own declared degradation curve, at 1,200 kWh/kWp a year
535
17,339 kWh
645
20,904 kWh
Lifetime gap
3,565 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario 535 645
Standard test conditions 25 °C 100.0% of rated power 535 W 645 W
Cool, bright day 40 °C 94.8% of rated power 507 W 612 W
Typical summer roof 55 °C 89.5% of rated power 479 W 579 W
Hot roof 70 °C 84.2% of rated power 451 W 546 W
03

Full specification

Parameter 535 645 Difference
Power and efficiency
Rated power 535 Wp 645 Wp +110 W for 645
Module efficiency 20.78 % 20.65 % Effectively the same
Power density 207.8 Wp/m² 206.4 Wp/m² Effectively the same
Open-circuit voltage 49.46 V 45.94 V 3.52 V apart
Voltage at max power 41.60 V 37.87 V 3.73 V apart
Short-circuit current 13.76 A 17.78 A 4.02 A apart
Current at max power 12.88 A 17.04 A 4.16 A apart
Temperature
Temperature coefficient -0.350 %/°C -0.340 %/°C +0.010 %/°C for 645
Mechanical
Dimensions 2272x1133x35 mm 2400x1302x35 mm 2272x1133x35 mm vs 2400x1302x35 mm
Module area 2.574 m² 3.125 m² 0.551 m² apart
Weight 27.5 kg 34.5 kg -7.0 kg for 535
Weight per kWp 51.4 kg/kWp 53.5 kg/kWp -2.1 kg/kWp for 535
Warranty and degradation
Product warranty 12 yrs 12 yrs Same
Performance warranty 27 yrs 27 yrs Same
Annual degradation 0.55 %/yr 0.55 %/yr Same
Technology
Cell technology PERC PERC Same
Cell type Monocrystalline Monocrystalline Same
Cell count 144 132 12 cells apart
Bifacial No No Same
04

Against the whole database

14,005 panels
Efficiency
#10,585 vs #11,014
535 leads by 429 places
Power density
#10,521 vs #11,023
535 leads by 502 places
Heat behaviour
#10,419 vs #8,778
645 leads by 1,641 places
Weight
#4,793 vs #7,451
535 leads by 2,658 places
Warranty
#9,667 vs #9,667
Tied - the same position in the database
Overall
#8,725 vs #4,962
645 leads by 3,763 places
05

More useful comparisons

Open the full database
Same series, other bin
Waaree WSMD-535 vs Waaree WSMD-665
12 differences, the largest is rated power
Same series, other bin
Waaree WSMD-535 vs Waaree WSMD-660
12 differences, the largest is rated power
Same series, other bin
Waaree WSMD-535 vs Waaree WSMD-655
11 differences, the largest is rated power
Same series, other bin
Waaree WSMD-535 vs Waaree WSMD-650
10 differences, the largest is rated power
Same series, other bin
Waaree WSMD-535 vs Waaree WSMD-545
3 differences, the largest is module efficiency
Same series, other bin
Waaree WSMD-535 vs Waaree WSMD-540
One difference: module efficiency
06

Written summary

07

Questions about this pairing

Which panel is better: Waaree WSMD-535 or Waaree WSMD-645?
According to our database: Waaree WSMD-535 has higher module efficiency (20.78% vs 20.65%); Waaree WSMD-645 tolerates heat better (temp coeff -0.340%/°C vs -0.350%/°C). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of Waaree WSMD-535 and Waaree WSMD-645?
Waaree WSMD-535 has a module efficiency of 20.78%, while Waaree WSMD-645 is 20.65%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does Waaree WSMD-535 use vs Waaree WSMD-645?
Waaree WSMD-535 uses PERC cells; Waaree WSMD-645 uses PERC. Modern n-type technologies (TOPCon, HJT, BC) typically deliver higher efficiency and lower degradation compared to older PERC (p-type) cells.
What is the warranty on Waaree WSMD-535 and Waaree WSMD-645?
Waaree WSMD-535 has a 27 years power warranty; Waaree WSMD-645 has a 27 years power warranty. The power warranty guarantees a minimum percentage of rated output at the end of the warranty period (typically 80-87%). Product (materials) warranties are usually shorter.

Shop prices: See 26 Waaree offers

Every figure here is from the manufacturers' own datasheets - a dash means the value is not published, never an estimate. The thirty-year projection and the temperature scenarios are calculations from those figures, and each states its assumption above.