Kowint Energy S4005-STW

Name: Kowint Energy S4005-STW
Brand: Kowint Energy

25.6 kWh · 15 kW · Lithium Iron Phosphate

UL 1973CEC listed · Oct 2, 2023

Overview

CEC Battery List

S4005-STW: 25.6 kWh nameplate energy; 15 kW continuous; lithium iron phosphate.

CEC Battery List

NLR PVWatts v8 · Cali-Graf calculation

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).

CEC Battery List

CEC Energy Storage System List

Battery	Energy	Continuous power	Chemistry	Warranty	SoCal permits
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
BYD BATTERY-BOX PREMIUM HVL (US)	12–32 kWh	7.5–20 kW	Lithium Iron Phosphate	10 years	1
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
GoodWe SECU-S Series	11.5–18.4 kWh	2.9–23 kW	Lithium Iron Phosphate	—	—

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