Cali-GrafCali-Graf
For pros Sign in
Illustration · 132 half-cut cells
Solar panelSEG Solar

SEG Solar SEG-545-BTC-HV

132 half-cut cells, bifacial. Power classes 535–560 W in the CEC list.

CEC listed · May 21, 2026UL 61730Bifacial
Power class
  • Power (STC)545 WCEC nameplate
  • Efficiency≈23.7%calculated from area
  • %/°C Pmax−0.272CEC listing test
  • PTC / STC95.5%PTC 520 W (CEC)

Power classes

CEC PV Module List (Oct 7, 2026) · Cali-Graf calculation · 5 models
ModelPmaxVoc, VIsc, AVmp, VImp, AEfficiencyPTCCEC listed
SEG-535-BTC-HV535 W47.8113.9540.5413.20≈23.3%511 WMay 21, 2026
SEG-540-BTC-HV540 W48.0113.9740.7313.26≈23.5%515 WMay 21, 2026
SEG-545-BTC-HV545 W48.2014.0140.9213.32≈23.7%520 WMay 21, 2026
SEG-555-BTC-HV555 W48.6014.1141.2613.45≈24.1%530 WMay 21, 2026
SEG-560-BTC-HV560 W48.8114.1541.4813.50≈24.3%535 WMay 21, 2026
≈ efficiency = Pmax ÷ CEC-listed area 2.3 m².

Heat & cold behaviour

CEC PV Module List (Oct 7, 2026) · Cali-Graf calculation
CEC listing test
Pmax coefficient γ−0.272 %/°C
Voc coefficient β−0.235 %/°C
Isc coefficient α+0.040 %/°C
Operating cell temperatureNOCT 43.5 °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
535 W400 W38.17 V × 10.48 A104.2 W97%
540 W403.7 W38.35 V × 10.53 A105.2 W97%
545 W407.4 W38.53 V × 10.57 A106.1 W97%
555 W414.8 W38.85 V × 10.68 A108.1 W97%
560 W418.6 W39.05 V × 10.72 A109 W97%
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
SEG Solar named Top Performer, 2022–2026
2
RETC PV Module Index
SEG Solar recognized 2023–2024
This exact series is not listed in published PVEL Top Performer tables. Results below are for the manufacturer.

RETC PV Module Index — SEG Solar

YearRecognition
2023High Achievement in Performance (LeTID RESISTANCE)
2024Test Category High Achiever

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)
50.8 V
Voc when cold
per panel
34.7 V
Vmp when hot
per panel
11
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 Vdatasheet2–11
Solis (Ginlong) S6-EH1P10K-H-US600 V80–520 Vdatasheet3–11
Solis (Ginlong) Solis-1P7.6K-4G-US600 V100–500 Vdatasheet3–11
Qcells Q.VOLT H7.6SX498 V234–498 VCEC test window7–9

Microinverters (one per panel)

MicroinverterRecommended module powerMax DC inputMPPTVoc cold / Vmp hotCheckDC/AC
APsystems (Alt Power System) DS3-L265–570 W60 V28–45 V50.8 / 34.7 V✓ Within range0.7
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 Angeles1,67691311,8746.08
Palmdale1,8351,00013,0016.69
Chula Vista1,69692412,0166.11
Huntington Beach1,64389511,6415.89
Riverside1,69692412,0166.21
Santa Clarita1,72494012,2156.28
775Jan776Feb995Mar1,100Apr1,086May1,154Jun1,216Jul1,230Aug1,076Sep949Oct815Nov706DeckWh 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 545 W panels

CEC PV Module List (Oct 7, 2026) · Kiwa PVEL Scorecard · datasheets · building permits
PanelPmaxEfficiencyγ Pmax (CEC)Voc, VIsc, APVEL (product / brand)SoCal permits (series)
SEG Solar SEG-545-BTC-HV545 W≈23.7%−0.27248.214.01brand 5×—
JA Solar JAM72D30-545/MB545 W≈21.6%−0.33049.7513.93product 2023, 20243
LONGi LR5-72HBD-545M545 W≥21.3%−0.35449.6513.92product 20261
Canadian Solar CS6W-545MB-AG545 W≈21.2%−0.32449.413.95product 20241
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 SEG Solar

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

Other series by SoCal permits

SEG-xxx-BMD-HV · 20SEG-xxx-BTD-BG · 8SEG-xxx-BHC-BGSEG-xxx-BTA-BGSEG-xxx-BTA-HVSEG-xxx-BTB-BG

Questions & answers

How efficient is the SEG Solar SEG-545-BTC-HV?

Calculated from the panel area (2.3 m²): about 23.7% for the 545 W class. 545 W over 2.3 m² equals about 237 W per square meter.

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

PVWatts v8 with typical-year weather gives about 913 kWh per year per 545 W panel in Los Angeles and about 1,000 kWh in Palmdale (20° roof, facing south, 14% system losses).

How much power does it lose on a hot roof?

With γ = −0.272 %/°C, at a 77 °C cell temperature (hottest modeled hour in Palmdale) output is about 14.1% 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 2–11 panels per string (Voc at 2 °C = 50.8 V, Vmp at 74 °C cell = 34.7 V). Final design must follow the inverter manual and NEC 690.7.

Does it work with APsystems (Alt Power System) DS3-L microinverters?

Voltage check against the APsystems (Alt Power System) datasheet: Voc when cold 50.8 V vs max input 60 V; Vmp when hot 34.7 V vs MPPT low 28 V; recommended module power 265–570 W. Confirm on the microinverter maker’s compatibility list.

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; SEG Solar was named a Top Performer in 5 Scorecards (2022–2026).

Sources

  1. California Energy Commission — Solar Equipment Lists, PV Module List, Inverter List (snapshot Oct 7, 2026).
  2. LONGi — manufacturer datasheet “LR5-72HBD Suitable for distributed projects Advanced module technology delivers superior”.
  3. Canadian Solar — datasheet BiHiKu6 BIFACIAL MONO PERC CS6W-520|525|530|535|540|545|550MB-AG.
  4. Kiwa PVEL — PV Module Reliability Scorecard, Top Performer lists 2022–2026.
  5. RETC — PV Module Index reports 2023–2024.
  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 — APsystems (Alt Power System), 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).