Illustration · 42 cells

Building-integrated solar panelTesla

Tesla SR72T2

42 cells, Solar Roof Module. 72 W in the CEC list.

CEC listed · Sep 13, 2021UL 61730Building-integrated (BIPV)Installed in 2 SoCal permits

Power (STC)72 WCEC nameplate
Efficiency≈14.7%calculated from area
%/°C Pmax−0.372CEC listing test
PTC / STC90.8%PTC 65 W (CEC)

Electrical ratings (STC)

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

Model	Pmax	Voc, V	Isc, A	Vmp, V	Imp, A	Efficiency	PTC	CEC listed
SR72T2	72 W	14.20	6.80	11.30	6.30	≈14.7%	65 W	Sep 13, 2021

≈ efficiency = Pmax ÷ CEC-listed area 0.49 m².

Heat & cold behaviour

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

	CEC listing test
Pmax coefficient γ	−0.372 %/°C
Voc coefficient β	−0.266 %/°C
Isc coefficient α	+0.037 %/°C
Operating cell temperature	NOCT 48.2 °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
72 W	53.2 W	10.54 V × 5.05 A	14.1 W	98%

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

CityColdest air, °CHottest cell, °C

15.1 V

Voc when cold

per panel

9 V

Vmp when hot

per panel

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.

Integrated roof products are wired per the manufacturer’s system design.

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	121	11,705	6.08
Palmdale	1,835	132	12,816	6.69
Chula Vista	1,696	122	11,845	6.11
Huntington Beach	1,643	118	11,475	5.89
Riverside	1,696	122	11,845	6.21
Santa Clarita	1,724	124	12,040	6.28

PVWatts models a standard roof-mounted module; integrated roof products are not modeled separately.

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 SRxxT2 panels in SoCal

building permits · CSLB License Master

Permits naming this series

Mar 2022 – Sep 2022

Licensed installers

CSLB license on the permit

Jurisdictions so far

Los Angeles (1), LA County (unincorp.) (1)

Tesla Energy Operations Inc

Fremont · CSLB #888104

1 installSep 2022Los Angeles

Only installer and ZIP level is shown — no homeowner names, street addresses or permit numbers. Permits from LA County (unincorp.) come without a contractor license, so they count toward totals but not toward installers. Counts grow as more permit portals are loaded.

Questions & answers

How efficient is the Tesla SR72T2?

Calculated from the panel area (0.49 m²): about 14.7% for the 72 W class. 72 W over 0.49 m² equals about 147 W per square meter.

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

PVWatts v8 with typical-year weather gives about 121 kWh per year per 72 W panel in Los Angeles and about 132 kWh in Palmdale (20° roof, facing south, 14% system losses).

How much power does it lose on a hot roof?

With γ = −0.372 %/°C, at a 77 °C cell temperature (hottest modeled hour in Palmdale) output is about 19.3% below the STC rating.

Who installs it in Southern California?

Building permits name this series 2 times (Mar 2022 – Sep 2022). The most active licensed installers are Tesla Energy Operations Inc.

Sources

California Energy Commission — Solar Equipment Lists, PV Module List (snapshot Oct 7, 2026).
NLR (formerly NREL) — PVWatts v8, NSRDB PSM v3 typical-year weather for Los Angeles, Palmdale, Chula Vista, Huntington Beach, Riverside, Santa Clarita.
Building permits — LADBS, City of Los Angeles (Sep 2022); Los Angeles County Public Works (EPIC-LA, unincorporated areas) (Mar 2022). 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).