Cali-Graf in Southern California

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5–30 kWh

Home battery systemRCT Power

RCT Power S-RESSxxxx-PBxxxx

5–30 kWh · 3.84–8 kW · Lithium Ion · direct PV input · 16 configurations

UL 9540UL 1741 SBCEC listed · Jan 2, 2025

Nameplate energy5–30 kWh
Continuous power3.84–8 kW
ChemistryLithium Ion

Overview

CEC Energy Storage System List

S-RESSxxxx-PBxxxx: 5–30 kWh nameplate energy; 3.84–8 kW continuous; lithium ion; accepts solar panels directly (DC-coupled).

Models & configurations

CEC Energy Storage System List · 16 listings

Model	Energy	Power	Grid voltage	Round trip	CEC listed
S-RESS8000-PB5.0 {208V, 5.0KWh}	5 kWh	7 kW	208 V	—	Jan 2, 2025
S-RESS8000-PB5.0 {240V, 5.0KWh}	5 kWh	8 kW	240 V	—	Jan 2, 2025
S-RESS8000-PB7.5 {208V, 7.5KWh}	7.5 kWh	7 kW	208 V	—	Jan 2, 2025
S-RESS8000-PB7.5 {240V, 7.5KWh}	7.5 kWh	8 kW	240 V	—	Jan 2, 2025
S-RESS8000-PB10.0 {208V, 10.0KWh}	10 kWh	7 kW	208 V	—	Jan 2, 2025
S-RESS8000-PB10.0 {240V, 10.0KWh}	10 kWh	8 kW	240 V	—	Jan 2, 2025
S-RESS8000-PB12.5 {208V, 12.5KWh}	12.5 kWh	7 kW	208 V	—	Jan 2, 2025
S-RESS8000-PB12.5 {240V, 12.5KWh}	12.5 kWh	8 kW	240 V	—	Jan 2, 2025
S-RESS8000-PB15.0 {208V, 15.0KWh}	15 kWh	7 kW	208 V	—	Jan 2, 2025
S-RESS8000-PB15.0 {240V, 15.0KWh}	15 kWh	8 kW	240 V	—	Jan 2, 2025
S-RESS8000-PB20.0 {208V, 20.0KWh}	20 kWh	7 kW	208 V	—	Jan 2, 2025
S-RESS8000-PB20.0 {240V, 20.0KWh}	20 kWh	8 kW	240 V	—	Jan 2, 2025
S-RESS8000-PB25.0 {208V, 25.0KWh}	25 kWh	7 kW	208 V	—	Jan 2, 2025
S-RESS8000-PB25.0 {240V, 25.0KWh}	25 kWh	8 kW	240 V	—	Jan 2, 2025
S-RESS8000-PB30.0 {208V, 30.0KWh}	30 kWh	7 kW	208 V	—	Jan 2, 2025
S-RESS8000-PB30.0 {240V, 30.0KWh}	30 kWh	8 kW	240 V	—	Jan 2, 2025

Capacity & power

CEC Energy Storage System List

Nameplate energy (CEC)5–30 kWh
Rated power (CEC)7–8 kW
Max continuous discharge (CEC)3.84–8 kW
Full-power discharge timeabout 3.7 h at full power
ChemistryLithium Ion
Grid connection208 / 240 V

Charging from solar in Southern California

NLR PVWatts v8 · Cali-Graf calculation · CEC Energy Storage System List

City	December	June
Los Angeles	9.3 kW	5.5 kW
Palmdale	8.6 kW	5 kW
Chula Vista	8 kW	5.7 kW
Huntington Beach	8.8 kW	6.1 kW
Riverside	9 kW	5.3 kW
Santa Clarita	8.8 kW	5.2 kW

Solar array size that refills the battery from empty in one average day, before the home uses any of it (NLR PVWatts v8, 20° south roof).

Direct PV inputYes

Safety listings

CEC Energy Storage System List

UL 9540 (energy storage system)Certified by CSA Group
Certificate date & editionSep 10, 2024 · Ed. 3 : 2023

UL 9540 certifies the whole storage system; UL 9540A is the fire-propagation test that fire codes ask for indoors and near walls.

California grid & code compliance

CEC Energy Storage System List

UL 1741 SB (IEEE 1547-2018)Yes
UL 1741 SA (Rule 21)Yes
CSIP (IEEE 2030.5)Yes (with conditions)
JA12 declaration (Title 24)No
Monitor Key Data schedulingYes

Compare with similar batteries

CEC Energy Storage System List

Battery	Energy	Continuous power	Chemistry	Warranty	SoCal permits
EG4 Electronics PP-100A15-18K1-LL	25.6 kWh	10.4–12 kW	Lithium Iron Phosphate	10 years	—
EG4 Electronics PP-100A15-18K1-LP	25.6 kWh	10.4–12 kW	Lithium Iron Phosphate	10 years	—
EG4 Electronics PP-16/280A2-18K1-AWLL	28.6 kWh	10.4–12 kW	Lithium Iron Phosphate	10 years	—
EG4 Electronics PP-16/280A2-18K2-AWLL	28.7 kWh	20.8–24 kW	Lithium Iron Phosphate	10 years	—
EG4 Electronics PP-100A16-18K1-LP	30.7 kWh	10.4–12 kW	Lithium Iron Phosphate	10 years	—
EG4 Electronics PP-100A16-18K1-LL	30.7 kWh	10.4–12 kW	Lithium Iron Phosphate	10 years	—

Same segment, similar capacity; each row from the same sources.

Questions & answers

How much energy does the RCT Power S-RESSxxxx-PBxxxx store?

5–30 kWh nameplate, per the California Energy Commission list.

Is the S-RESSxxxx-PBxxxx UL 9540 certified?

Yes — the CEC list shows UL 9540 certification (certified by csa group).

Sources

California Energy Commission — Energy Storage System List, data as of Oct 7, 2026. Manufacturer-reported values confirmed by CEC against certificates.
NLR (formerly NREL) — PVWatts v8, NSRDB PSM v3 typical-year weather for Los Angeles, Palmdale, Riverside, Santa Clarita, Chula Vista, Huntington Beach.
Cali-Graf calculations — formulas and inputs are shown next to each calculated value (efficiency from area, temperature-corrected voltages, string sizing, energy estimates).