Illustration · 108 half-cut cells

Solar panelCertainTeed

CertainTeed CTTC450HC12-08

Name: CertainTeed CTTC450HC12-08
Brand: CertainTeed

108 half-cut cells, bifacial. Power classes 425–455 W in the CEC list.

CEC listed · Jun 2, 2025UL 61730BifacialInstalled in 3 SoCal permits

Power class

Power (STC)450 WCEC nameplate
Efficiency≈23.1%calculated from area
%/°C Pmax−0.303CEC listing test
PTC / STC94.9%PTC 427 W (CEC)

Power classes

CEC PV Module List (Oct 7, 2026) · Cali-Graf calculation · 7 models

Model	Pmax	Voc, V	Isc, A	Vmp, V	Imp, A	Efficiency	PTC	CEC listed
CTTC425HC12-08	425 W	38.30	14.05	32.20	13.23	≈21.8%	403 W	Jun 2, 2025
CTTC430HC12-08	430 W	38.40	14.13	32.50	13.28	≈22.1%	408 W	Jun 2, 2025
CTTC435HC12-08	435 W	38.50	14.22	32.80	13.32	≈22.3%	412 W	Jun 2, 2025
CTTC440HC12-08	440 W	38.60	14.30	33.00	13.36	≈22.6%	417 W	Jun 2, 2025
CTTC445HC12-08	445 W	38.80	14.38	33.20	13.40	≈22.8%	422 W	Jun 2, 2025
CTTC450HC12-08	450 W	38.80	14.47	33.50	13.44	≈23.1%	427 W	Jun 2, 2025
CTTC455HC12-08	455 W	39.00	14.54	33.80	13.48	≈23.3%	432 W	Jun 2, 2025

≈ efficiency = Pmax ÷ CEC-listed area 1.95 m².

Heat & cold behaviour

CEC PV Module List (Oct 7, 2026) · Cali-Graf calculation

	CEC listing test
Pmax coefficient γ	−0.303 %/°C
Voc coefficient β	−0.229 %/°C
Isc coefficient α	+0.049 %/°C
Operating cell temperature	NOCT 43.5 °C

Vmp coefficient ≈ γ − α (CEC); used only for the hot-roof voltage estimate.

Away from lab conditions — CEC listing test points

Class	Pmax at NOCT	Vmp × Imp at NOCT	Pmax at 200 W/m²	Low-light efficiency vs STC
425 W	312.5 W	28 V × 11.16 A	79.7 W	94%
430 W	320.6 W	28.4 V × 11.29 A	81.6 W	95%
435 W	327.8 W	28.7 V × 11.42 A	83.5 W	96%
440 W	335 W	29 V × 11.55 A	85.5 W	97%
445 W	342.2 W	29.3 V × 11.68 A	87.1 W	98%
450 W	350.8 W	29.7 V × 11.81 A	89.4 W	99%
455 W	358.5 W	30 V × 11.95 A	91.4 W	100%

Pmax = Vmp × Imp from the CEC listing; low-light efficiency = Pmax at 200 W/m² ÷ (20% of STC Pmax).

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)

CityColdest air, °CHottest cell, °CString inverter

40.8 V

Voc when cold

per panel

27.7 V

Vmp when hot

per panel

Max panels / string

max DC 600 V

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

Inverter	Max DC input	MPPT	Window source	Panels per string
Tesla 1538000-xx-y	600 V	60–480 V	datasheet	3–14
Solis (Ginlong) S6-EH1P10K-H-US	600 V	80–520 V	datasheet	3–14
Solis (Ginlong) Solis-1P7.6K-4G-US	600 V	100–500 V	datasheet	4–14
Qcells Q.VOLT H7.6SX	498 V	234–498 V	CEC test window	9–12

Microinverters (one per panel)

Microinverter	Recommended module power	Max DC input	MPPT	Voc cold / Vmp hot	Check	DC/AC
Enphase IQ8X-80-M-US	320–540 W	79.5 V	43–60 V	40.8 / 27.7 V	✗ Not a match: module voltage below MPPT range	1.18
APsystems (Alt Power System) DS3-L	265–570 W	60 V	28–45 V	40.8 / 27.7 V	⚠ Works; below MPPT at peak heat	0.58
Enphase IQ8M-72-2-US	260–460 W	60 V	30–45 V	40.8 / 27.7 V	⚠ Works; below MPPT at peak heat	1.38
Enphase IQ8A-72-2-US	295–500 W	60 V	32–45 V	40.8 / 27.7 V	⚠ Works; below MPPT at peak heat	1.29

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

PanelsCity for chartSystem size

City	kWh / kW / yr	kWh / panel / yr	kWh / system / yr	Sun, kWh/m²/day
Los Angeles	1,676	754	12,067	6.08
Palmdale	1,835	826	13,212	6.69
Chula Vista	1,696	763	12,211	6.11
Huntington Beach	1,643	739	11,830	5.89
Riverside	1,696	763	12,211	6.21
Santa Clarita	1,724	776	12,413	6.28

Estimate for comparison, not a quote: shading, roof orientation and local losses change real output. Roof mount, 20° tilt, south, 14% system losses.

Who installs CTTCxxxHC12-08 panels in SoCal

building permits · CSLB License Master

Permits naming this series

Nov 2025 – Jul 2026

Licensed installers

CSLB license on the permit

Jurisdictions so far

Huntington Beach (1), Chula Vista (1), Palmdale (1)

B V I Solar

San Diego · CSLB #1033754

1 installJul 2026Palmdale

Preman A Roofing Inc

San Diego · CSLB #764917

1 installApr 2026Chula Vista

Solar Discovery Inc

Northridge · CSLB #1014977

1 installNov 2025Huntington Beach

Permits over time

Power class named in permit

450 W

440 W

Only installer and ZIP level is shown — no homeowner names, street addresses or permit numbers. Counts grow as more permit portals are loaded.

Compare with similar 450 W panels

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

Panel	Pmax	Efficiency	γ Pmax (CEC)	Voc, V	Isc, A	PVEL (product / brand)	SoCal permits (series)
CertainTeed CTTC450HC12-08	450 W	≈23.1%	−0.303	38.8	14.47	—	3
Qcells Q.TRON BLK M-G2+ 445	445 W	≈22.8%	−0.276	40.16	13.98	brand 11× (2016–2026)	40
Hyundai Energy Solutions HiN-T450NF(BK)	450 W	≈23.2%	−0.298	39.2	14.53	brand 5× (2017–2025)	37
REC Group REC450AA Pure-RX	450 W	≈22.3%	−0.248	65.1	8.81	brand 9× (2016–2025)	33

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.

Questions & answers

How efficient is the CertainTeed CTTC450HC12-08?

Calculated from the panel area (1.95 m²): about 23.1% for the 450 W class. 450 W over 1.95 m² equals about 231 W per square meter.

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

PVWatts v8 with typical-year weather gives about 754 kWh per year per 450 W panel in Los Angeles and about 826 kWh in Palmdale (20° roof, facing south, 14% system losses).

How much power does it lose on a hot roof?

With γ = −0.303 %/°C, at a 77 °C cell temperature (hottest modeled hour in Palmdale) output is about 15.7% 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 3–14 panels per string (Voc at 2 °C = 40.8 V, Vmp at 74 °C cell = 27.7 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.

Who installs it in Southern California?

Building permits name this series 3 times (Nov 2025 – Jul 2026). The most active licensed installers are B V I Solar, Preman A Roofing Inc, Solar Discovery Inc.

Sources

California Energy Commission — Solar Equipment Lists, PV Module List, Inverter List (snapshot Oct 7, 2026).
Qcells — manufacturer datasheet “Q.TRON BLK M-G2+ SERIES 415–440 Wp”.
Hyundai Energy Solutions — datasheet [US] NF(BK)(HiN) Series (N TOPCon Bifacial) 435~445W.
Kiwa PVEL — PV Module Reliability Scorecard, Top Performer lists.
NLR (formerly NREL) — System Advisor Model CEC module and inverter libraries (version 2026.7.3).
NLR (formerly NREL) — PVWatts v8, NSRDB PSM v3 typical-year weather for Los Angeles, Palmdale, Chula Vista, Huntington Beach, Riverside, Santa Clarita.
Inverter datasheets — APsystems (Alt Power System), Enphase, Solis (Ginlong), Tesla (manufacturer documents).
Building permits — City of Huntington Beach (Nov 2025); City of Chula Vista (Apr 2026); City of Palmdale (Jul 2026). Equipment matched from permit descriptions by model number.
Contractors State License Board — License Master (contractor names and license status), as of Oct 5, 2026.
Cali-Graf calculations — formulas and inputs are shown next to each calculated value (efficiency from area, temperature-corrected voltages, string sizing, energy estimates).