705 vs 690 16 of 19 identical Swap Change panels

BYD NSBK-33-705 vs BYD NSBK-33-690

Q: Which panel is better: BYD NSBK-33-705 or BYD NSBK-33-690?

According to our database: BYD NSBK-33-705 has higher module efficiency (22.70% vs 22.22%). See the full spec comparison and 30-year energy simulation above for a complete picture.

Q: What is the efficiency of BYD NSBK-33-705 and BYD NSBK-33-690?

BYD NSBK-33-705 has a module efficiency of 22.70%, while BYD NSBK-33-690 is 22.22%. Higher efficiency means more electricity from the same roof area - useful when space is limited.

Q: What cell technology does BYD NSBK-33-705 use vs BYD NSBK-33-690?

BYD NSBK-33-705 uses TOPCon cells; BYD NSBK-33-690 uses TOPCon. Modern n-type technologies (TOPCon, HJT, BC) typically deliver higher efficiency and lower degradation compared to older PERC (p-type) cells.

Q: What is the warranty on BYD NSBK-33-705 and BYD NSBK-33-690?

BYD NSBK-33-705 has a 30 years power warranty; BYD NSBK-33-690 has a 30 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.

Q: Are BYD NSBK-33-705 and BYD NSBK-33-690 bifacial panels?

Both BYD NSBK-33-705 and BYD NSBK-33-690 are bifacial - they capture reflected light from the ground, which can add 5-15% more annual energy on ground-mount or elevated rooftop installations with a light surface beneath.

BYD

NSBK-33-705

705 Wp 22.70 % TOPCon Bifacial

Open panel page Datasheet PDF

BYD

NSBK-33-690

690 Wp 22.22 % TOPCon Bifacial

Open panel page Datasheet PDF

The verdict

705 leads on the differences that matter

The largest is module efficiency: 0.48 pp more efficient. 16 of 19 comparable parameters are identical.

See all 3 differences

How alike are they

16 of 19 comparable
parameters are identical

identical differs

What actually differs

3 of 19 parameters

Parameter 705 690 Difference

Module efficiency 22.70 % 22.22 % 0.48 pp more efficient

Power density 227.0 Wp/m² 222.1 Wp/m² 4.8 Wp/m² higher

Rated power 705 Wp 690 Wp 15 W more power

What it means on a roof

Thirty years of production

Each panel's own declared degradation curve, at 1,200 kWh/kWp a year

Cell temperature

Same temp coeff. for both panels (-0.278 %/°C), so a warmer roof scales both curves by the same factor: the totals fall together and neither panel gains on the other.

705

23,654 kWh

690

23,151 kWh

Lifetime gap

503 kWh

Output when it is hot

Rated power carried across the range a module actually sees

Scenario 705 690

Standard test conditions 25 °C 100.0% of rated power 705 W 690 W

Cool, bright day 40 °C 95.8% of rated power 676 W 661 W

Typical summer roof 55 °C 91.7% of rated power 646 W 632 W

Hot roof 70 °C 87.5% of rated power 617 W 604 W

Full specification

Parameter 705 690 Difference

Power and efficiency

Rated power 705 Wp 690 Wp +15 W for 705

Module efficiency 22.70 % 22.22 % +0.48 pp for 705

Power density 227.0 Wp/m² 222.1 Wp/m² +4.8 Wp/m² for 705

Open-circuit voltage 48.78 V 48.12 V Effectively the same

Voltage at max power 40.94 V 40.28 V Effectively the same

Short-circuit current 18.17 A 18.08 A Effectively the same

Current at max power 17.22 A 17.13 A Effectively the same

Temperature

Temperature coefficient -0.278 %/°C -0.278 %/°C Same

Mechanical

Dimensions 2384x1303x33 mm 2384x1303x33 mm Same

Module area 3.106 m² 3.106 m² Same

Weight 38.3 kg 38.3 kg Same

Weight per kWp 54.3 kg/kWp 55.5 kg/kWp Effectively the same

Warranty and degradation

Product warranty 12 yrs 12 yrs Same

Performance warranty 30 yrs 30 yrs Same

Annual degradation 0.40 %/yr 0.40 %/yr Same

Technology

Cell technology TOPCon TOPCon Same

Cell type Monocrystalline Monocrystalline Same

Cell count 132 132 Same

Bifacial Yes Yes Same

Against the whole database

14,005 panels

Efficiency

#3,307 vs #5,753

705 leads by 2,446 places

Power density

#3,361 vs #5,734

705 leads by 2,373 places

Heat behaviour

#1,295 vs #1,295

Tied - the same position in the database

Weight

#8,604 vs #9,882

705 leads by 1,278 places

Warranty

#21 vs #21

Tied - the same position in the database

Overall

#1,007 vs #1,523

705 leads by 516 places

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Written summary

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Questions about this pairing

Which panel is better: BYD NSBK-33-705 or BYD NSBK-33-690?

According to our database: BYD NSBK-33-705 has higher module efficiency (22.70% vs 22.22%). See the full spec comparison and 30-year energy simulation above for a complete picture.

What is the efficiency of BYD NSBK-33-705 and BYD NSBK-33-690?

BYD NSBK-33-705 has a module efficiency of 22.70%, while BYD NSBK-33-690 is 22.22%. Higher efficiency means more electricity from the same roof area - useful when space is limited.

What cell technology does BYD NSBK-33-705 use vs BYD NSBK-33-690?

BYD NSBK-33-705 uses TOPCon cells; BYD NSBK-33-690 uses TOPCon. 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 BYD NSBK-33-705 and BYD NSBK-33-690?

BYD NSBK-33-705 has a 30 years power warranty; BYD NSBK-33-690 has a 30 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.

Are BYD NSBK-33-705 and BYD NSBK-33-690 bifacial panels?

Both BYD NSBK-33-705 and BYD NSBK-33-690 are bifacial - they capture reflected light from the ground, which can add 5-15% more annual energy on ground-mount or elevated rooftop installations with a light surface beneath.

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.