PowerOak EnergyPro 13K

Name: PowerOak EnergyPro 13K
Brand: PowerOak

Hybrid inverter, dc-coupled hybrid (pv + battery). 2 models, 5.78 kW–13.2 kW AC at 240 V.

UL 1741 SBCEC listed · Sep 2, 2025

Model

Rated AC power13.2 kW
CEC weighted efficiency97.0%

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
EnergyPro 6K	5.78 kW	240 V	5.78 kW	5.78 kW	95.0%	63–87 V	Dec 22, 2025	SB
EnergyPro 13K	13.2 kW	240 V	13.2 kW	13.2 kW	97.0%	370–500 V	Sep 2, 2025	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) · NLR SAM inverter library

CEC test DC voltages (min / nom / max)370 / 420 / 500 V
DC input at rated output (CEC test)13.6 kW

Efficiency

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

CEC weighted efficiency97.0%
Night-time standby (tare)16.4 W
Power to start converting52 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 Sep 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*)
Power control system (PCS)Stated in CEC listing (power control system)
CEC listedSep 2, 2025
Last CEC updateOct 13, 2025

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

EnergyPro 13K: max DC 500 V · MPPT 370–500 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	no fit	—
Qcells Q.PEAK DUO BLK ML-G10+ 410	410 W	48.1 V	30.6 V	no fit	—
LONGi LR5-54HABB-400M	400 W	39.3 V	25.3 V	no fit	—
JA Solar JAM54S31-405/MR	405 W	39.4 V	25.5 V	no fit	—
Hyundai Solutions HiN-T440NF(BK)	440 W	40.9 V	27 V	no fit	—
Silfab Solar SIL-440QD	440 W	41.1 V	28 V	no fit	—
Qcells Q.TRON BLK M-G2+ 430	430 W	41.3 V	28 V	no fit	—
Qcells Q.TRON BLK M-G2.H+ 430	430 W	41.3 V	28 V	no fit	—
REC Group REC460AA Pure-RX	460 W	68.8 V	47.1 V	no fit	—
Elin (Sirius PV) ELNSM54M-HC-410	410 W	39.3 V	25.3 V	no fit	—
Qcells Q.TRON BLK M-G2.C+ 430	430 W	41.3 V	28 V	no fit	—
Tesla TSP-420	420 W	43.4 V	27.7 V	no fit	—

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

Battery & storage pairings

CEC Energy Storage System List

CEC-certified storage systems that include it

System	Energy	Power	Chemistry	CEC listed
Shenzhen Poweroak Newener Co., Ltd. EnergyPro 13K+EnergyPack 500X2	9.6 kWh	13.2 kW	Lithium Iron Phosphate	Aug 11, 2025
Shenzhen Poweroak Newener Co., Ltd. EnergyPro 13K+EnergyPack 500X3	14.4 kWh	13.2 kW	Lithium Iron Phosphate	Aug 11, 2025
Shenzhen Poweroak Newener Co., Ltd. EnergyPro 13K+EnergyPack 500X4	19.2 kWh	13.2 kW	Lithium Iron Phosphate	Aug 11, 2025

Compare with similar 13.2 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
PowerOak EnergyPro xxK	5.78 kW–13.2 kW	97.0%	370–500 V	Yes	2025	0
SolarEdge SExxxxH-US	3 kW–11.4 kW	99.0%	360–480 V	Yes	2025	1,046
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
EG4 Electronics 18KPV-12LV	10.4 kW–12 kW	97.0%	230–480 V	Yes	2023	7

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

Questions & answers

How efficient is the PowerOak EnergyPro xxK?

The California Energy Commission lists a weighted efficiency of 95.0–97.0% for PowerOak EnergyPro xxK models, measured at six power levels and three DC voltages.

What sizes does the PowerOak EnergyPro xxK come in?

The CEC list includes 2 models from 5.78 kW to 13.2 kW AC: EnergyPro 6K, EnergyPro 13K.

Is the PowerOak EnergyPro xxK certified to UL 1741 SB?

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

Can the PowerOak EnergyPro xxK be used with a battery?

The CEC lists it as a dc-coupled hybrid (pv + battery). CEC-certified storage systems that include it: Shenzhen Poweroak Newener Co., Ltd. EnergyPro 13K+EnergyPack 500X2, Shenzhen Poweroak Newener Co., Ltd. EnergyPro 13K+EnergyPack 500X3, Shenzhen Poweroak Newener Co., Ltd. EnergyPro 13K+EnergyPack 500X4.

What is the EnergyPro 13K’s DC input voltage range?

CEC tested it at 370–500 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.
California Energy Commission — Energy Storage System List, data as of Oct 7, 2026. Manufacturer-reported values confirmed by CEC against certificates.
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).