Cali-Graf in Southern California

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String inverterWSTECH

WSTECH APS870-PV-1-480-5

String inverter. 1 model, 870 kW AC at 480 V.

CEC listed · Jul 1, 2021

Rated AC power870 kW
CEC weighted efficiency98.0%

DC input (PV side)

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

CEC test DC voltages (min / nom / max)770 / 1,000 / 1,470 V
DC input at rated output (CEC test)893.9 kW

AC output (grid side)

CEC Grid Support Inverter List (Oct 7, 2026)

Rated AC power870 kW
CEC-measured continuous output872 kW
Grid voltage480 V
Phase3-phase 480 V

Efficiency

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

CEC weighted efficiency98.0%
Night-time standby (tare)91.4 W
Power to start converting2,670.9 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.)No
UL 1741 SA (SA8–SA13)Yes — MET
Firmware tested (SA)APU V3130 APMC V2050
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) conformanceNo
Monitor key data & scheduling (Rule 21 Phase 3)No
CEC listedJul 1, 2021

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

APS870-PV-1-480-5: max DC 1,470 V · MPPT 770–1,470 V (CEC test window)

Most-permitted panels in Southern California

Panel	Power	Voc cold	Vmp hot	Panels per string	Installed together
Qcells Q.PEAK DUO BLK ML-G10.C+ 410	410 W	48.1 V	30.6 V	26–30	—
Qcells Q.PEAK DUO BLK ML-G10+ 410	410 W	48.1 V	30.6 V	26–30	—
LONGi LR5-54HABB-400M	400 W	39.3 V	25.3 V	31–37	—
JA Solar JAM54S31-405/MR	405 W	39.4 V	25.5 V	31–37	—
Hyundai Solutions HiN-T440NF(BK)	440 W	40.9 V	27 V	29–35	—
Silfab Solar SIL-440QD	440 W	41.1 V	28 V	28–35	—
Qcells Q.TRON BLK M-G2+ 430	430 W	41.3 V	28 V	28–35	—
Qcells Q.TRON BLK M-G2.H+ 430	430 W	41.3 V	28 V	28–35	—
REC Group REC460AA Pure-RX	460 W	68.8 V	47.1 V	17–21	—
Elin (Sirius PV) ELNSM54M-HC-410	410 W	39.3 V	25.3 V	31–37	—
Qcells Q.TRON BLK M-G2.C+ 430	430 W	41.3 V	28 V	28–35	—
Tesla TSP-420	420 W	43.4 V	27.7 V	28–33	—

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

About WSTECH

CEC Grid Support Inverter List (Oct 7, 2026)

ManufacturerWSTECH
Listed in CEC asWSTECH GmbH
Models on CEC lists8

Other series

APSxxx-PV-1-440-5

Questions & answers

How efficient is the WSTECH APSxxx-PV-1-480-5?

The California Energy Commission lists a weighted efficiency of 98.0% for WSTECH APSxxx-PV-1-480-5 models, measured at six power levels and three DC voltages.

Is the WSTECH APSxxx-PV-1-480-5 certified to UL 1741 SB?

The CEC list does not show UL 1741 SB certification for these models.

What is the APS870-PV-1-480-5’s DC input voltage range?

CEC tested it at 770–1,470 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).
Cali-Graf calculations — formulas and inputs are shown next to each calculated value (efficiency from area, temperature-corrected voltages, string sizing, energy estimates).