Illustration

Hybrid inverterPower Center

Power Center Flex 12

Name: Power Center Flex 12
Brand: Power Center

Hybrid inverter, dc-coupled hybrid (pv + battery). 4 models, 10 kW–12 kW AC at 208 V / 240 V.

UL 1741 SBCEC listed · Aug 11, 2026

Model

Rated AC power12 kW
CEC weighted efficiency97.0%

Models & power ratings

CEC Grid Support Inverter List (Oct 7, 2026) · 4 models

Model	Nominal AC	Grid voltage	CEC continuous	CEC weighted eff.	DC test window	CEC listed	UL 1741 SB
Flex 10	10 kW	208 V	8.67 kW	96.5%	220–500 V	Aug 11, 2026	SB
Flex 10	10 kW	240 V	9.99 kW	97.0%	220–500 V	Aug 11, 2026	SB
Flex 12	12 kW	208 V	11.5 kW	96.5%	220–500 V	Aug 11, 2026	SB
Flex 12	12 kW	240 V	12 kW	97.0%	220–500 V	Aug 11, 2026	SB

Some models are also on the CEC Battery Inverter list — one product, two listings.

DC input (PV side)

CEC Grid Support Inverter List (Oct 7, 2026)

CEC test DC voltages (min / nom / max)220 / 360 / 500 V

Efficiency

CEC Grid Support Inverter List (Oct 7, 2026)

CEC weighted efficiency97.0%
Night-time standby (tare)16.48 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 — Intertek, certificate May 28, 2026
UL 1741 SA (SA8–SA13)Yes — Intertek
Firmware tested (SA)V0.1
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*)
Anti-islanding method groupsGroups 1, 5 (manufacturer-reported)
CEC listedAug 11, 2026

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

Panel compatibility & string sizing

CEC Grid Support Inverter List (Oct 7, 2026) · NLR PVWatts v8 · CEC PV Module List · Cali-Graf calculation

CityColdest air, °CHottest cell, °C

Flex 12: max DC 500 V · MPPT 220–500 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	8–10	—
Qcells Q.PEAK DUO BLK ML-G10+ 410	410 W	48.1 V	30.6 V	8–10	—
LONGi LR5-54HABB-400M	400 W	39.3 V	25.3 V	9–12	—
JA Solar JAM54S31-405/MR	405 W	39.4 V	25.5 V	9–12	—
Hyundai Solutions HiN-T440NF(BK)	440 W	40.9 V	27 V	9–12	—
Silfab Solar SIL-440QD	440 W	41.1 V	28 V	8–12	—
Qcells Q.TRON BLK M-G2+ 430	430 W	41.3 V	28 V	8–12	—
Qcells Q.TRON BLK M-G2.H+ 430	430 W	41.3 V	28 V	8–12	—
REC Group REC460AA Pure-RX	460 W	68.8 V	47.1 V	5–7	—
Elin (Sirius PV) ELNSM54M-HC-410	410 W	39.3 V	25.3 V	9–12	—
Qcells Q.TRON BLK M-G2.C+ 430	430 W	41.3 V	28 V	8–12	—
Tesla TSP-420	420 W	43.4 V	27.7 V	8–11	—

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 12 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
Power Center Flex	10 kW–12 kW	97.0%	220–500 V	Yes	2026	0
SolarEdge SExxxxH-US	3 kW–11.4 kW	99.0%	360–480 V	Yes	2025	1,046
Delta Electronics Ex-TL-US	3.33 kW–9.6 kW	97.5%	200–480 V	Yes	2022	28
SolarEdge SExxxxxA-US	3.8 kW–11.4 kW	98.0%	320–500 V	No	2024	18
Growatt MIN xxxxTL-XH-US	2.63 kW–11.4 kW	98.0%	125–480 V	Yes	2021	15

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

About Power Center

CEC Grid Support Inverter List (Oct 7, 2026)

ManufacturerPower Center
Listed in CEC asPower Center
Websiteduracellpowercenter.com
Models on CEC lists49

Other series

Essential Hybrid 5Max Hybrid

Questions & answers

How efficient is the Power Center Flex?

The California Energy Commission lists a weighted efficiency of 96.5–97.0% for Power Center Flex models, measured at six power levels and three DC voltages.

What sizes does the Power Center Flex come in?

The CEC list includes 4 models from 10 kW to 12 kW AC: Flex 10, Flex 10, Flex 12, Flex 12.

Is the Power Center Flex certified to UL 1741 SB?

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

Can the Power Center Flex be used with a battery?

The CEC lists it as a dc-coupled hybrid (pv + battery).

What is the Flex 12’s DC input voltage range?

CEC tested it at 220–500 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) — 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).