14.8 × 10 × 2.2 in

MicroinverterGenerac

Generac PM-820

Name: Generac PM-820
Brand: Generac

Microinverter. 2 models, 820 W AC at 208 V / 240 V.

UL 1741 SBCEC listed · Aug 1, 2025

Model

Rated AC power820 W
CEC weighted efficiency97.0%
Max DC input70 V
Warranty25 years

Models & power ratings

CEC Grid Support Inverter List (Oct 7, 2026) · NLR SAM inverter library · 2 models

Model	Nominal AC	Grid voltage	CEC continuous	Rated AC (SAM)	CEC weighted eff.	DC test window	CEC listed	UL 1741 SB
PM-820	820 W	208 V	820 W	820 W	96.5%	32–40 V	Aug 1, 2025	SB
PM-820	820 W	240 V	820 W	820 W	97.0%	32–40 V	Aug 1, 2025	SB

DC input (PV side)

Generac datasheet · CEC Grid Support Inverter List (Oct 7, 2026)

Max DC input voltage70 V
MPPT operating range31–42 V
CEC test DC voltages (min / nom / max)32 / 38 / 40 V
Start-up voltage22 V
DC operating range24–65 V
Max short-circuit current21 A
Max / recommended DC power500 W

AC output (grid side)

Generac datasheet · CEC Grid Support Inverter List (Oct 7, 2026)

Rated AC power820 W
CEC-measured continuous output820 W
Grid voltage208 V / 240 V
Phase208 V (1-phase of 3-phase service), split-phase 120/240 V
Frequency60 Hz
Max continuous output current3.42 A

Efficiency

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

CEC weighted efficiency97.0%
Peak efficiency97.3%
Night-time standby (tare)0.39 W
Power to start converting6 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) · Generac datasheet

UL 1741 SB (3rd ed.)Yes — Intertek, certificate Jun 26, 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) conformanceVia gateway during testing (Y*)
Monitor key data & scheduling (Rule 21 Phase 3)No
CEC listedAug 1, 2025
Standards listed on the datasheetUL 1741, UL 1741 SA, UL 1741 SB, IEEE 1547, UL 2703, FCC Part 15, CA Rule 21, HECO Rule 14H

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

Monitoring & communication

Generac datasheet

InterfacesWi-Fi, Ethernet, Cellular

Size, weight & environment

Generac datasheets

Dimensions (W × H × D)14.8 × 10 × 2.2 in
Weight8 lb (3.6 kg)
Enclosure ratingNEMA Type 3R, NEMA Type 6
CoolingNatural convection (no fans)
Operating temperature−40 to +65 °C

Warranty

Generac datasheet

Standard warranty25 years

Panel compatibility & string sizing

Generac datasheet · NLR PVWatts v8 · CEC PV Module List · Cali-Graf calculation

CityColdest air, °CHottest cell, °C

PM-820: max DC 70 V · MPPT 31–42 V (datasheet)

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	0.5	—
Qcells Q.PEAK DUO BLK ML-G10+ 410	410 W	48.1 / 30.6 V	⚠ Below MPPT at peak heat	0.5	—
LONGi LR5-54HABB-400M	400 W	39.3 / 25.3 V	⚠ Below MPPT at peak heat	0.49	—
JA Solar JAM54S31-405/MR	405 W	39.4 / 25.5 V	⚠ Below MPPT at peak heat	0.49	—
Hyundai Solutions HiN-T440NF(BK)	440 W	40.9 / 27 V	⚠ Below MPPT at peak heat	0.54	—
Silfab Solar SIL-440QD	440 W	41.1 / 28 V	⚠ Below MPPT at peak heat	0.54	—
Qcells Q.TRON BLK M-G2+ 430	430 W	41.3 / 28 V	⚠ Below MPPT at peak heat	0.52	—
Qcells Q.TRON BLK M-G2.H+ 430	430 W	41.3 / 28 V	⚠ Below MPPT at peak heat	0.52	—
REC Group REC460AA Pure-RX	460 W	68.8 / 47.1 V	✓ Within range	0.56	—
Elin (Sirius PV) ELNSM54M-HC-410	410 W	39.3 / 25.3 V	⚠ Below MPPT at peak heat	0.5	—
Qcells Q.TRON BLK M-G2.C+ 430	430 W	41.3 / 28 V	⚠ Below MPPT at peak heat	0.52	—
Tesla TSP-420	420 W	43.4 / 27.7 V	⚠ Below MPPT at peak heat	0.51	—

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 820 W 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
Generac PM-820	820 W–820 W	97.0%	32–40 V	Yes	2025	0
Hoymiles HM-xxxNT	295 W–1.44 kW	96.5%	29–48 V	11 of 12	2023	3
Power Center Dxxx-M2	696 W–696 W	96.5%	33–48 V	Yes	2022	2
FOXESS M1-1000-NA	1 kW–1 kW	95.5%	35–50 V	Yes	2026	—
FOXESS M1-xxxx-NA	600 W–1.2 kW	95.5%	35–50 V	Yes	2026	—

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

About Generac

CEC Grid Support Inverter List (Oct 7, 2026)

ManufacturerGenerac
Listed in CEC asGenerac Power Systems, Inc.
Websitegenerac.com
Models on CEC lists56

Other series

CP-xxx-V2

Documents

manufacturer documents

PDF
click or tap to open
Datasheet · Generac · Sep 2025

Questions & answers

How efficient is the Generac PM-820?

The California Energy Commission lists a weighted efficiency of 96.5–97.0% for Generac PM-820 models, measured at six power levels and three DC voltages. The datasheet states a peak efficiency of 97.3%.

What sizes does the Generac PM-820 come in?

The CEC list includes 2 models from 820 W to 820 W AC: PM-820, PM-820.

Is the Generac PM-820 certified to UL 1741 SB?

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

What is the PM-820’s DC input voltage range?

Max DC input voltage is 70 V per the datasheet. MPPT operating range 31–42 V. CEC tested it at 32–40 V DC.

What warranty does it have?

25 years standard (manufacturer datasheet).

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.
Generac — manufacturer datasheet “Specification Sheet Model Number: PM-820 The Generac PWRmicro is a powerful, reliable and”.
Generac — datasheet click or tap to open.
Generac — document library on the manufacturer’s website (links above).
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).