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Illustration · 132 half-cut cells
Solar panelWaaree

Waaree Bi-68 640

132 half-cut cells, bifacial, glass (dual-glass module). Power classes 620–660 W in the CEC list.

CEC listed · Apr 3, 2023UL 61730Bifacial
Power class
  • Power (STC)640 WCEC nameplate
  • Efficiency≈21.3%calculated from area
  • %/°C Pmax−0.337CEC listing test
  • PTC / STC93.1%PTC 596 W (CEC)

Power classes

CEC PV Module List (Oct 7, 2026) · Cali-Graf calculation · 9 models
ModelPmaxVoc, VIsc, AVmp, VImp, AEfficiencyPTCCEC listed
Bi-68-620620 W45.1317.4637.5516.52≈20.7%577 WApr 3, 2023
Bi-68-625625 W45.2917.5237.6116.62≈20.8%582 WApr 3, 2023
Bi-68-630630 W45.4517.5837.6716.73≈21.0%586 WApr 3, 2023
Bi-68-635635 W45.6117.6537.7316.83≈21.2%591 WApr 3, 2023
Bi-68-640640 W45.7717.7137.7916.94≈21.3%596 WApr 3, 2023
Bi-68-645645 W45.9417.7837.8717.04≈21.5%601 WApr 3, 2023
Bi-68-650650 W46.0917.8437.9117.16≈21.7%606 WApr 3, 2023
Bi-68-655655 W46.2617.9037.9417.29≈21.8%610 WApr 3, 2023
Bi-68-660660 W46.4017.9838.0617.35≈22.0%615 WApr 3, 2023
≈ efficiency = Pmax ÷ CEC-listed area 3 m².

Build & dimensions

CEC PV Module List (Oct 7, 2026)

Heat & cold behaviour

CEC PV Module List (Oct 7, 2026) · Cali-Graf calculation
CEC listing test
Pmax coefficient γ−0.337 %/°C
Voc coefficient β−0.343 %/°C
Isc coefficient α+0.017 %/°C
Operating cell temperatureNOCT 46.6 °C
Vmp coefficient ≈ γ − α (CEC); used only for the hot-roof voltage estimate.

Away from lab conditions — CEC listing test points

ClassPmax at NOCTVmp × Imp at NOCTPmax at 200 W/m²Low-light efficiency vs STC
620 W458.1 W35.78 V × 12.8 A122.6 W99%
625 W461.6 W35.83 V × 12.88 A123.6 W99%
630 W465.4 W35.89 V × 12.97 A124.6 W99%
635 W468.9 W35.95 V × 13.04 A125.5 W99%
640 W472.7 W36.01 V × 13.13 A126.5 W99%
645 W476.5 W36.08 V × 13.21 A127.6 W99%
650 W480.4 W36.12 V × 13.3 A128.6 W99%
655 W484.4 W36.15 V × 13.4 A129.7 W99%
660 W487.6 W36.26 V × 13.45 A130.5 W99%
Pmax = Vmp × Imp from the CEC listing; low-light efficiency = Pmax at 200 W/m² ÷ (20% of STC Pmax).

Independent reliability testing

Kiwa PVEL Scorecard · RETC PV Module Index
5
PVEL Scorecards
Waaree named Top Performer, 2022–2026
2025, 2026
RETC Overall Highest Achiever
Waaree, manufacturer level
This exact series is not listed in published PVEL Top Performer tables. Results below are for the manufacturer.

RETC PV Module Index — Waaree

YearRecognition
2024Test Category High Achiever
2025Overall Highest Achiever
2026Overall Highest Achiever; High achievement in performance; High achievement in reliability; Performance discipline high achiever (Temperature coefficient, Iam, Letid); Quality discipline high achiever (BOM verification); Reliability discipline high achiever (Damp heat, Pid, Tc)

Inverter compatibility & string sizing

CEC PV Module List (Oct 7, 2026) · Cali-Graf calculation · NLR PVWatts v8 · inverter datasheets · NLR SAM inverter library · CEC Grid Support Inverter List (Oct 7, 2026)
49.4 V
Voc when cold
per panel
31.2 V
Vmp when hot
per panel
12
Max panels / string
max DC 600 V
2
Min panels / string
MPPT from 60 V
Defaults come from NLR TMY weather (coldest hour, hottest modeled cell). Code calculations (NEC 690.7) use the ASHRAE extreme annual minimum, which is usually colder — enter it above. β is the CEC-measured coefficient; NEC 690.7 calculations use the datasheet value.

String inverters most named in SoCal permits

InverterMax DC inputMPPTWindow sourcePanels per string
Tesla 1538000-xx-y600 V60–480 Vdatasheet2–12
Solis (Ginlong) S6-EH1P10K-H-US600 V80–520 Vdatasheet3–12
Solis (Ginlong) Solis-1P7.6K-4G-US600 V100–500 Vdatasheet4–12
Qcells Q.VOLT H7.6SX498 V234–498 VCEC test window8–10

Microinverters (one per panel)

No microinverter in the reference set lists this power class in its recommended module power range.
Voltage check against the microinverter datasheets — confirm the pairing on the manufacturer’s module compatibility list. Rows appear only when the panel’s power is inside the microinverter’s recommended module power range.
SolarEdge and other optimizer-based systems size strings by the optimizer rules — use the manufacturer’s designer. Reference inverters: most named in SoCal permits since Oct 2024.

Expected production in Southern California

NLR PVWatts v8 · Cali-Graf calculation
CitykWh / kW / yrkWh / panel / yrkWh / system / yrSun, kWh/m²/day
Los Angeles1,6761,07311,7996.08
Palmdale1,8351,17412,9186.69
Chula Vista1,6961,08511,9406.11
Huntington Beach1,6431,05211,5675.89
Riverside1,6961,08511,9406.21
Santa Clarita1,7241,10312,1376.28
770Jan771Feb989Mar1,093Apr1,079May1,147Jun1,208Jul1,222Aug1,069Sep943Oct810Nov701DeckWh per month · Los Angeles
Estimate for comparison, not a quote: shading, roof orientation and local losses change real output. Roof mount, 20° tilt, south, 14% system losses.

Compare with similar 640 W panels

CEC PV Module List (Oct 7, 2026) · Kiwa PVEL Scorecard · datasheets
PanelPmaxEfficiencyγ Pmax (CEC)Voc, VIsc, APVEL (product / brand)
Waaree Bi-68 640640 W≈21.3%−0.33745.7717.71brand 5×
Canadian Solar CS7N-640MB-AG640 W≈20.8%−0.39044.618.31product 2024
Hyundai Energy Solutions HiN-T640NJ640 W≈23.1%−0.27356.314.41brand 5× (2017–2025)
JinkoSolar JKM640N-66HL4M-BDV640 W≈23.7%−0.29949.8816.32product 2025
Same fields from the same sources for every row; ≈ efficiency is calculated from the listed area. Comparable series: other brands, same product group, power range covering this class.

About Waaree

CEC PV Module List (Oct 7, 2026) · Kiwa PVEL Scorecard · RETC PV Module Index · building permits

Other series by SoCal permits

WSMDi · 3BiN-21BiN-01BiN-02BiN-03BiN-05

Questions & answers

How efficient is the Waaree Bi-68 640?

Calculated from the panel area (3 m²): about 21.3% for the 640 W class. 640 W over 3 m² equals about 213 W per square meter.

How much energy does one panel produce in Los Angeles or Palmdale?

PVWatts v8 with typical-year weather gives about 1,073 kWh per year per 640 W panel in Los Angeles and about 1,174 kWh in Palmdale (20° roof, facing south, 14% system losses).

How much power does it lose on a hot roof?

With γ = −0.337 %/°C, at a 77 °C cell temperature (hottest modeled hour in Palmdale) output is about 17.5% below the STC rating.

How many panels fit on one string?

With the Tesla 1538000-xx-y (max DC 600 V, MPPT from 60 V, datasheet) in Los Angeles the calculator gives 2–12 panels per string (Voc at 2 °C = 49.4 V, Vmp at 74 °C cell = 31.2 V). Final design must follow the inverter manual and NEC 690.7.

Is it bifacial?

Yes. Rear gain depends on mounting height and ground reflectance.

Has this panel been reliability-tested?

This exact series is not in published PVEL Top Performer tables; Waaree was named a Top Performer in 5 Scorecards (2022–2026). RETC named Waaree Overall Highest Achiever in 2025, 2026.

Sources

  1. California Energy Commission — Solar Equipment Lists, PV Module List, Inverter List (snapshot Oct 7, 2026).
  2. Hyundai Energy Solutions — datasheet [US] NJ(HiN) Series (N TOPCon Bifacial) 640~645W.
  3. JinkoSolar — datasheet THE MOST DEPENDABLE SOLAR PRODUCT.
  4. Kiwa PVEL — PV Module Reliability Scorecard, Top Performer lists 2022–2026.
  5. RETC — PV Module Index reports 2024–2026.
  6. NLR (formerly NREL) — System Advisor Model CEC module and inverter libraries (version 2026.7.3).
  7. NLR (formerly NREL) — PVWatts v8, NSRDB PSM v3 typical-year weather for Los Angeles, Palmdale, Chula Vista, Huntington Beach, Riverside, Santa Clarita.
  8. Inverter datasheets — Solis (Ginlong), Tesla (manufacturer documents).
  9. Building permits — Southern California permit portals. Equipment matched from permit descriptions.
  10. Cali-Graf calculations — formulas and inputs are shown next to each calculated value (efficiency from area, temperature-corrected voltages, string sizing, energy estimates).