GoodWe SECU-S Series

2.6–20.5 kWh · 2.9–23 kW · Lithium Iron Phosphate · 8 configurations

UL 1973CEC listed · Mar 1, 2021

Usable energy11.5–18.4 kWh
Continuous power2.9–23 kW
ChemistryLithium Iron Phosphate

Overview

CEC Battery List

SECU-S Series: 11.5–18.4 kWh usable energy; 2.9–23 kW continuous; lithium iron phosphate.

Models & configurations

CEC Battery List · 8 listings

Model	Energy	Power	Grid voltage	Round trip	CEC listed
SECU-S2.5	2.6 kWh	—	—	—	Mar 1, 2021
SECU-S5	5.1 kWh	—	—	—	Mar 1, 2021
SECU-S7.5	7.7 kWh	—	—	—	Mar 1, 2021
SECU-S10	10.2 kWh	—	—	—	Mar 1, 2021
SECU-S13	12.8 kWh	—	—	—	Mar 1, 2021
SECU-S15	15.4 kWh	—	—	—	Mar 1, 2021
SECU-S18	17.9 kWh	—	—	—	Mar 1, 2021
SECU-S20	20.5 kWh	—	—	—	Mar 1, 2021

Capacity & power

CEC Battery List

Nameplate energy (CEC)2.6–20.5 kWh
Total energy (datasheet)12.8–20.5 kWh
Usable energy11.5–18.4 kWh
Depth of discharge90%
Max continuous discharge (CEC)2.9–23 kW
Continuous power (datasheet)12.8–20.5 kW
Full-power discharge timeabout 0.6 h at full power
ChemistryLithium Iron Phosphate
Battery voltage (DC, nominal)256–409.6 V

How long can it power your home?

Cali-Graf calculation

Average home load	Runtime from full
0.5 kW	≈ 23 h
1 kW	≈ 11.5 h
2 kW	≈ 5.8 h
3 kW	≈ 3.8 h
20.48 kW (full continuous power)	≈ 0.6 h

Runtime = 11.5 kWh usable (datasheet) ÷ load. A typical home averages 1–2 kW; air conditioning and EV charging use much more. Inverter and wiring losses shorten it.

Charging from solar in Southern California

NLR PVWatts v8 · Cali-Graf calculation

City	December	June
Los Angeles	3.6 kW	2.1 kW
Palmdale	3.3 kW	1.9 kW
Chula Vista	3.1 kW	2.2 kW
Huntington Beach	3.4 kW	2.3 kW
Riverside	3.4 kW	2 kW
Santa Clarita	3.4 kW	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).

Installation & environment

CEC Battery List · GoodWe datasheet

Installation locationindoor/outdoor
Operating temperature0 to 50 °C
Mountingwall
Weight per kWh1 kWh

Safety listings

CEC Battery List

UL 1973 (stationary battery)Certified by SGS
Certificate date & editionFeb 2, 2021 · Ed. 2 : 2018
Other standards on datasheetUL 1973, UL 1642, UN 38.3

Full specifications

CEC Battery List · GoodWe datasheet

Communicationcan
Manufacturer websitegoodwe.com

Compare with similar batteries

CEC Energy Storage System List

Battery	Energy	Continuous power	Chemistry	Warranty	SoCal permits
LG Energy Solution RESU 10H Prime	9.6–16 kWh	5 kW	Lithium Ion	—	127
Qcells Q.SAVE	9–18 kWh	5.5–11.1 kW	Lithium Iron	10 years	30
Tigo Energy TSB	9 kWh	3.5–5.2 kW	Lithium Iron Phosphate	11 years	2
FOXESS ECS4000-H5	25 kWh	14.4 kW	Lithium Iron Phosphate	—	1
RNG International Renogy X	20 kWh	10 kW	Lithium Iron Phosphate	10 years	1
Panasonic EV-Xxx	9–18 kWh	5.5–11.1 kW	Lithium Iron Phosphate	12 years	—

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

Questions & answers

How much energy does the GoodWe SECU-S Series store?

11.5–18.4 kWh usable, per the manufacturer datasheet.

How long can the SECU-S Series power a home?

About 11.5 hours at an average 1 kW load from a full charge (11.5 kWh usable); higher loads shorten it.

Can the SECU-S Series be installed outdoors?

Installation location per the datasheet: indoor/outdoor.

Sources

California Energy Commission — Energy Storage System List, data as of Oct 7, 2026. Manufacturer-reported values confirmed by CEC against certificates.
California Energy Commission — Battery List, data as of Oct 7, 2026.
GoodWe — manufacturer datasheet “SECU-S Series (North America Only) High Voltage Battery”.
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).