Cali-Graf in Southern California

For pros Sign in

Illustration

MicroinverterFOXESS

FOXESS M1-1200-NA

Microinverter. 4 models, 600 W–1.2 kW AC at 208 V / 240 V.

UL 1741 SBCEC listed · May 1, 2026

Model

Rated AC power1.2 kW
CEC weighted efficiency95.5%

Models & power ratings

CEC Grid Support Inverter List (Oct 7, 2026) · NLR SAM inverter library · 4 models

Model	Nominal AC	Grid voltage	CEC continuous	Rated AC (SAM)	CEC weighted eff.	DC test window	CEC listed	UL 1741 SB
M1-600-NA	600 W	208 V	607 W	607 W	95.0%	35–50 V	May 1, 2026	SB
M1-800-NA	800 W	208 V	814 W	814 W	95.5%	35–50 V	May 1, 2026	SB
M1-800-NA	800 W	240 V	814 W	814 W	95.5%	35–50 V	May 1, 2026	SB
M1-1200-NA	1.2 kW	240 V	1.2 kW	1.2 kW	95.5%	35–50 V	May 1, 2026	SB

DC input (PV side)

CEC Grid Support Inverter List (Oct 7, 2026) · NLR SAM inverter library

CEC test DC voltages (min / nom / max)35 / 42 / 50 V
DC input at rated output (CEC test)1.26 kW

Efficiency

CEC Grid Support Inverter List (Oct 7, 2026) · NLR SAM inverter library

CEC weighted efficiency95.5%
Night-time standby (tare)0.42 W
Power to start converting5 W

CEC weighted efficiency is measured by an accredited lab at six power levels and three DC voltages — the number to compare between inverters.

Grid & smart-inverter certification

CEC Grid Support Inverter List (Oct 7, 2026)

UL 1741 SB (3rd ed.)Yes — CSA Group, certificate Nov 17, 2025
UL 1741 SA (SA8–SA13)No
Volt-VAr with reactive power priority (SA13)No
Freq-Watt / Volt-Watt (SA14–15)No
Disable permit service / limit active power (SA17–18)No
CSIP (IEEE 2030.5) conformanceNo
Anti-islanding method groupsGroups 1, 2a, 2b, 2c, 3, 4, 5, 6, other (manufacturer-reported)
CEC listedMay 1, 2026

UL 1741 SB is required for new interconnections in California (Rule 21) since 2026.

Panel compatibility & string sizing

NLR SAM inverter library · NLR PVWatts v8 · CEC PV Module List · Cali-Graf calculation

CityColdest air, °CHottest cell, °C

M1-1200-NA: max DC 50 V · MPPT 35–50 V (CEC test window)

Most-permitted panels in Southern California

Panel	Power	Voc cold / Vmp hot	Check	DC/AC	Installed together
Qcells Q.PEAK DUO BLK ML-G10.C+ 410	410 W	48.1 / 30.6 V	⚠ Below MPPT at peak heat	0.34	—
Qcells Q.PEAK DUO BLK ML-G10+ 410	410 W	48.1 / 30.6 V	⚠ Below MPPT at peak heat	0.34	—
LONGi LR5-54HABB-400M	400 W	39.3 / 25.3 V	⚠ Below MPPT at peak heat	0.33	—
JA Solar JAM54S31-405/MR	405 W	39.4 / 25.5 V	⚠ Below MPPT at peak heat	0.34	—
Hyundai Solutions HiN-T440NF(BK)	440 W	40.9 / 27 V	⚠ Below MPPT at peak heat	0.37	—
Silfab Solar SIL-440QD	440 W	41.1 / 28 V	⚠ Below MPPT at peak heat	0.37	—
Qcells Q.TRON BLK M-G2+ 430	430 W	41.3 / 28 V	⚠ Below MPPT at peak heat	0.36	—
Qcells Q.TRON BLK M-G2.H+ 430	430 W	41.3 / 28 V	⚠ Below MPPT at peak heat	0.36	—
REC Group REC460AA Pure-RX	460 W	68.8 / 47.1 V	✗ Cold Voc above max input	0.38	—
Elin (Sirius PV) ELNSM54M-HC-410	410 W	39.3 / 25.3 V	⚠ Below MPPT at peak heat	0.34	—
Qcells Q.TRON BLK M-G2.C+ 430	430 W	41.3 / 28 V	⚠ Below MPPT at peak heat	0.36	—
Tesla TSP-420	420 W	43.4 / 27.7 V	⚠ Below MPPT at peak heat	0.35	—

Voltage check only, from CEC panel data and NLR weather for the city. Final design must follow the inverter manual and NEC 690.7.

Compare with similar 1.2 kW inverters

CEC Grid Support Inverter List (Oct 7, 2026) · building permits

Inverter	Power	CEC weighted eff.	DC test window	UL 1741 SB	Latest CEC	SoCal permits
FOXESS M1-xxxx-NA	600 W–1.2 kW	95.5%	35–50 V	Yes	2026	0
Hoymiles HM-xxxNT	295 W–1.44 kW	96.5%	29–48 V	11 of 12	2023	3
FOXESS M1-1000-NA	1 kW–1 kW	95.5%	35–50 V	Yes	2026	—
APsystems (Altenergy Power System) QSxxxx	1.2 kW–1.92 kW	96.5%	27–48 V	2 of 3	2025	—
Sol-Ark SA-MP-1000-208/240V	1 kW–1,000 kW	96.0%	40–55 V	Yes	2025	—

Same type and grid voltage, power range covering this model; same fields from the same sources.

About FOXESS

CEC Grid Support Inverter List (Oct 7, 2026)

ManufacturerFOXESS
Listed in CEC asFOXESS CO., LTD.
Websitefox-ess.com
Models on CEC lists117

Other series

M1-1000-NA

Questions & answers

How efficient is the FOXESS M1-xxxx-NA?

The California Energy Commission lists a weighted efficiency of 95.0–95.5% for FOXESS M1-xxxx-NA models, measured at six power levels and three DC voltages.

What sizes does the FOXESS M1-xxxx-NA come in?

The CEC list includes 4 models from 600 W to 1.2 kW AC: M1-600-NA, M1-800-NA, M1-800-NA, M1-1200-NA.

Is the FOXESS M1-xxxx-NA certified to UL 1741 SB?

Yes — the CEC Grid Support Inverter List shows UL 1741 SB for all models.

What is the M1-1200-NA’s DC input voltage range?

CEC tested it at 35–50 V DC.

Sources

California Energy Commission — Grid Support Inverter List (solar and battery inverters), data as of Oct 7, 2026. Manufacturer-reported, confirmed by CEC against certificates and test reports.
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, Riverside, Santa Clarita, Chula Vista, Huntington Beach.
California Energy Commission — PV Module List (module electrical data for the compatibility check).
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).