Illustration · 120 half-cut cells

Solar panelSonali Energees

Sonali Energees SS120H-340M

Name: Sonali Energees SS120H-340M
Brand: Sonali Energees

120 half-cut cells. Power classes 310–375 W in the CEC list.

CEC listed · Aug 21, 2024UL 61730

Power class

Power (STC)340 WCEC nameplate
Efficiency≈20.1%calculated from area
%/°C Pmax−0.379CEC listing test
PTC / STC93.4%PTC 318 W (CEC)

Power classes

CEC PV Module List (Oct 7, 2026) · Cali-Graf calculation · 13 models

Model	Pmax	Voc, V	Isc, A	Vmp, V	Imp, A	Efficiency	PTC	CEC listed
SS120H-310M	310 W	39.80	9.87	33.10	9.37	≈18.3%	289 W	Aug 21, 2024
SS120H-315M	315 W	40.10	9.95	33.40	9.44	≈18.6%	294 W	Aug 21, 2024
SS120H-320M	320 W	40.40	10.01	33.60	9.52	≈18.9%	298 W	Aug 21, 2024
SS120H-325M	325 W	40.70	10.08	33.90	9.59	≈19.2%	303 W	Aug 21, 2024
SS120H-330M	330 W	41.00	10.16	34.20	9.66	≈19.5%	308 W	Aug 21, 2024
SS120H-335M	335 W	41.20	10.35	34.40	9.75	≈19.8%	313 W	Aug 21, 2024
SS120H-340M	340 W	41.40	10.44	34.60	9.82	≈20.1%	318 W	Aug 21, 2024
SS120H-350M	350 W	41.10	11.01	33.60	10.42	≈19.2%	327 W	Aug 21, 2024
SS120H-355M	355 W	41.30	11.08	33.80	10.51	≈19.5%	331 W	Aug 21, 2024
SS120H-360M	360 W	41.50	11.15	34.00	10.59	≈19.8%	336 W	Aug 21, 2024
SS120H-365M	365 W	41.70	11.22	34.20	10.68	≈20.1%	341 W	Aug 21, 2024
SS120H-370M	370 W	41.90	11.29	34.40	10.76	≈20.3%	346 W	Aug 21, 2024
SS120H-375M	375 W	42.10	11.36	34.60	10.84	≈20.6%	351 W	Aug 21, 2024

≈ efficiency = Pmax ÷ CEC-listed area 1.69 m².

Build & dimensions

CEC PV Module List (Oct 7, 2026)

Module area1.69 m² (18.2 ft²)CEC-listed area
Cells120 half-cut cells
Back coverWhite backsheet

Heat & cold behaviour

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

	CEC listing test
Pmax coefficient γ	−0.379 %/°C
Voc coefficient β	−0.319 %/°C
Isc coefficient α	+0.045 %/°C
Operating cell temperature	NOCT 43.1 °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
310 W	234 W	31.2 V × 7.5 A	58.6 W	94%
315 W	238.1 W	31.5 V × 7.56 A	59.4 W	94%
320 W	241.6 W	31.7 V × 7.62 A	60.4 W	94%
325 W	245.8 W	32 V × 7.68 A	61.3 W	94%
330 W	249.7 W	32.3 V × 7.73 A	62.5 W	95%
335 W	253.8 W	32.5 V × 7.81 A	63.5 W	95%
340 W	256.2 W	32.6 V × 7.86 A	64.2 W	94%
350 W	265.4 W	31.9 V × 8.32 A	67.4 W	96%
355 W	269.3 W	32.1 V × 8.39 A	68.5 W	96%
360 W	273.3 W	32.3 V × 8.46 A	69.5 W	97%
365 W	277.2 W	32.5 V × 8.53 A	70.3 W	96%
370 W	280 W	32.6 V × 8.59 A	71.3 W	96%
375 W	284 W	32.8 V × 8.66 A	72.4 W	97%

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

44.4 V

Voc when cold

per panel

27.4 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	3–13
Solis (Ginlong) S6-EH1P10K-H-US	600 V	80–520 V	datasheet	3–13
Solis (Ginlong) Solis-1P7.6K-4G-US	600 V	100–500 V	datasheet	4–13
Qcells Q.VOLT H7.6SX	498 V	234–498 V	CEC test window	9–11

Microinverters (one per panel)

Microinverter	Recommended module power	Max DC input	MPPT	Voc cold / Vmp hot	Check	DC/AC
Enphase IQ8PLUS-72-2-US	235–440 W	60 V	29–45 V	44.4 / 27.4 V	⚠ Works; below MPPT at peak heat	1.17
Enphase IQ8X-80-M-US	320–540 W	79.5 V	43–60 V	44.4 / 27.4 V	✗ Not a match: module voltage below MPPT range	0.89
APsystems (Alt Power System) DS3-L	265–570 W	60 V	28–45 V	44.4 / 27.4 V	⚠ Works; below MPPT at peak heat	0.44
Enphase IQ8M-72-2-US	260–460 W	60 V	30–45 V	44.4 / 27.4 V	⚠ Works; below MPPT at peak heat	1.05
Enphase IQ8A-72-2-US	295–500 W	60 V	32–45 V	44.4 / 27.4 V	⚠ Works; below MPPT at peak heat	0.97

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	570	11,967	6.08
Palmdale	1,835	624	13,102	6.69
Chula Vista	1,696	577	12,109	6.11
Huntington Beach	1,643	559	11,731	5.89
Riverside	1,696	577	12,109	6.21
Santa Clarita	1,724	586	12,309	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.

Compare with similar 340 W panels

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

Panel	Pmax	Efficiency	γ Pmax (CEC)	Voc, V	Isc, A	PVEL (product / brand)	SoCal permits (series)
Sonali Energees SS120H-340M	340 W	≈20.1%	−0.379	41.4	10.44	—	—
LONGi LR4-60HPB-340M	340 W	≈18.8%	−0.337	40.1	10.84	product 2021, 2022	193
JinkoSolar JKM340M-60HBL	340 W	≈20.1%	−0.406	41	10.82	brand 12× (2014–2026)	45
REC Group REC340AA	340 W	≈20.2%	−0.279	43.1	10.09	brand 9× (2016–2025)	30

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 Sonali Energees SS120H-340M?

Calculated from the panel area (1.69 m²): about 20.1% for the 340 W class. 340 W over 1.69 m² equals about 201 W per square meter.

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

PVWatts v8 with typical-year weather gives about 570 kWh per year per 340 W panel in Los Angeles and about 624 kWh in Palmdale (20° roof, facing south, 14% system losses).

How much power does it lose on a hot roof?

With γ = −0.379 %/°C, at a 77 °C cell temperature (hottest modeled hour in Palmdale) output is about 19.6% 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 3–13 panels per string (Voc at 2 °C = 44.4 V, Vmp at 74 °C cell = 27.4 V). Final design must follow the inverter manual and NEC 690.7.

Sources

California Energy Commission — Solar Equipment Lists, PV Module List, Inverter List (snapshot Oct 7, 2026).
JinkoSolar — datasheet THE MOST DEPENDABLE SOLAR BRAND.
JinkoSolar — manufacturer datasheet “Eagle HC 60M G2 315-335 Watt MONO PERC HALF CELL MODULE”.
Kiwa PVEL — PV Module Reliability Scorecard, Top Performer lists.
NLR (formerly NREL) — System Advisor Model CEC inverter library (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 — Southern California permit portals. Equipment matched from permit descriptions.
Cali-Graf calculations — formulas and inputs are shown next to each calculated value (efficiency from area, temperature-corrected voltages, string sizing, energy estimates).