14.1 × 9.5 × 1.8 in

MicroinverterAPsystems (Altenergy Power Sys…

APsystems (Altenergy Power System) QT2-480

Microinverter. 1 model, 1.8 kW AC at 480 V.

UL 1741 SBCEC listed · Oct 3, 2022Rapid shutdown

Rated AC power1.73 kW
CEC weighted efficiency95.5%
Max DC input60 V
Warranty10 years

DC input (PV side)

APsystems (Altenergy Power System) datasheets · CEC Grid Support Inverter List (Oct 7, 2026)

Max DC input voltage60 V
MPPT operating range30–45 V
CEC test DC voltages (min / nom / max)34 / 38 / 42 V
DC operating range26–60 V
Max input current20 A
Max short-circuit current25 A
Max / recommended DC power315–670 W recommended module power

AC output (grid side)

APsystems (Altenergy Power System) datasheet · CEC Grid Support Inverter List (Oct 7, 2026)

Rated AC power1.73 kW
CEC-measured continuous output1.82 kW
Grid voltage480 V
Phase3-phase 480 V
AC voltage range385–552 V

Efficiency

CEC Grid Support Inverter List (Oct 7, 2026) · APsystems (Altenergy Power System) datasheet · NLR SAM inverter library

CEC weighted efficiency95.5%
Peak efficiency96.5%
Night-time standby (tare)0.22 W
Power to start converting9.2 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) · APsystems (Altenergy Power System) datasheet

UL 1741 SB (3rd ed.)Yes — CSA Group, certificate Mar 30, 2023
UL 1741 SA (SA8–SA13)Yes — CSA Group
Firmware tested (SA)V3
Volt-VAr with reactive power priority (SA13)Yes
Freq-Watt / Volt-Watt (SA14–15)Yes
Disable permit service / limit active power (SA17–18)Yes
CSIP (IEEE 2030.5) conformanceVia gateway during testing (Y*)
Monitor key data & scheduling (Rule 21 Phase 3)Yes (attested Oct 21, 2022)
CEC listedOct 3, 2022
Last CEC updateMay 11, 2023
Standards listed on the datasheetUL 1741, UL 1741 SA, UL 1741 SB, IEEE 1547, CA Rule 21

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

Safety & protection

APsystems (Altenergy Power System) datasheet

Rapid shutdown (NEC 690.12)Yes (NEC 690.12, datasheet)

Monitoring & communication

APsystems (Altenergy Power System) datasheet

InterfacesZigbee

Size, weight & environment

APsystems (Altenergy Power System) datasheet

Dimensions (W × H × D)14.1 × 9.5 × 1.8 in
Weight13.2 lb (6 kg)
CoolingNatural convection (no fans)
Operating temperature−40 to +65 °C

Warranty

APsystems (Altenergy Power System) datasheet

Standard warranty10 years

Panel compatibility & string sizing

APsystems (Altenergy Power System) datasheet · NLR PVWatts v8 · CEC PV Module List · Cali-Graf calculation

CityColdest air, °CHottest cell, °C

QT2-480: max DC 60 V · MPPT 30–45 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	✓ Within range	0.23	—
Qcells Q.PEAK DUO BLK ML-G10+ 410	410 W	48.1 / 30.6 V	✓ Within range	0.23	—
LONGi LR5-54HABB-400M	400 W	39.3 / 25.3 V	⚠ Below MPPT at peak heat	0.22	—
JA Solar JAM54S31-405/MR	405 W	39.4 / 25.5 V	⚠ Below MPPT at peak heat	0.22	—
Hyundai Solutions HiN-T440NF(BK)	440 W	40.9 / 27 V	⚠ Below MPPT at peak heat	0.24	—
Silfab Solar SIL-440QD	440 W	41.1 / 28 V	⚠ Below MPPT at peak heat	0.24	—
Qcells Q.TRON BLK M-G2+ 430	430 W	41.3 / 28 V	⚠ Below MPPT at peak heat	0.24	—
Qcells Q.TRON BLK M-G2.H+ 430	430 W	41.3 / 28 V	⚠ Below MPPT at peak heat	0.24	—
REC Group REC460AA Pure-RX	460 W	68.8 / 47.1 V	✗ Cold Voc above max input	0.25	—
Elin (Sirius PV) ELNSM54M-HC-410	410 W	39.3 / 25.3 V	⚠ Below MPPT at peak heat	0.23	—
Qcells Q.TRON BLK M-G2.C+ 430	430 W	41.3 / 28 V	⚠ Below MPPT at peak heat	0.24	—
Tesla TSP-420	420 W	43.4 / 27.7 V	⚠ Below MPPT at peak heat	0.23	—

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 1.73 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
APsystems (Altenergy Power System) QTx-480	1.8 kW–1.8 kW	95.5%	34–42 V	Yes	2022	0
APsystems (Altenergy Power System) QT2	1.73 kW–1.8 kW	96.0%	34–42 V	Yes	2022	—

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

About APsystems (Altenergy Power System)

CEC Grid Support Inverter List (Oct 7, 2026)

ManufacturerAPsystems (Altenergy Power System)
Listed in CEC asAltenergy Power System Inc.
Websiteapsystems.com
Models on CEC lists101

Other series

QSxxxxEZx-LVQT2QS1

Documents

manufacturer documents

PDF
APsystems Microinverter QT2 for Philippines Datasheet Rev1.0 2022-06-27
Datasheet · APsystems · Jun 2022
PDF
4304612202 APsystems Microinverter QT2 for Philippines Datasheet Rev1.3 2024-08-22
Datasheet · APsystems · Sep 2024
PDF
APsystems Microinverter QT2 for Philippines Datasheet Rev1.4 2025-03-07
Datasheet · APsystems · Apr 2025
PDF
APsystems Microinverter QT2 for Philippines Datasheet Rev1.1 2022-09-24
Datasheet · APsystems · Apr 2023

Questions & answers

How efficient is the APsystems (Altenergy Power System) QTx-480?

The California Energy Commission lists a weighted efficiency of 95.5% for APsystems (Altenergy Power System) QTx-480 models, measured at six power levels and three DC voltages. The datasheet states a peak efficiency of 96.5%.

Is the APsystems (Altenergy Power System) QTx-480 certified to UL 1741 SB?

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

What is the QT2-480’s DC input voltage range?

Max DC input voltage is 60 V per the datasheet. MPPT operating range 30–45 V. CEC tested it at 34–42 V DC.

What warranty does it have?

10 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.
APsystems (Altenergy Power System) — datasheet 4304612202 APsystems Microinverter QT2 for Philippines Datasheet Rev1.3 2024-08-22.
APsystems (Altenergy Power System) — datasheet APsystems Microinverter QT2 for Philippines Datasheet Rev1.0 2022-06-27.
APsystems (Altenergy Power System) — 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).