sonnen Tech Specs - sonnen eco Gen 3.1

Name: sonnen Tech Specs - sonnen eco Gen 3.1
Brand: sonnen

4–20 kWh · 3–7 kW · Lithium Iron Phosphate · 13 configurations

UL 9540CEC listed · Oct 12, 2020

Overview

CEC Energy Storage System List

Tech Specs - sonnen eco Gen 3.1: 4–20 kWh nameplate energy; 3–7 kW continuous; lithium iron phosphate; 10 years warranty.

CEC Energy Storage System List · 13 listings

Model	Energy	Power	Grid voltage	Round trip	CEC listed
ECO5 {4kWh}	4 kWh	3.6 kW	240 V	—	Oct 12, 2020
ECO5 {5kWh}	5 kWh	3.6 kW	240 V	—	Oct 12, 2020
ECO5 {6kWh}	6 kWh	3.6 kW	240 V	—	Oct 12, 2020
ECO5 {7.5kWh}	7.5 kWh	3.6 kW	240 V	—	Oct 12, 2020
ECO5 {8kWh}	8 kWh	3.6 kW	240 V	—	Oct 12, 2020
ECO10 {10kWh}	10 kWh	7.2 kW	240 V	—	Oct 12, 2020
ECO10 {12kWh}	12 kWh	7.2 kW	240 V	—	Oct 12, 2020
ECO10 {12.5kWh}	12.5 kWh	7.2 kW	240 V	—	Oct 12, 2020
ECO10 {14kWh}	14 kWh	7.2 kW	240 V	—	Oct 12, 2020
ECO10 {15kWh}	15 kWh	7.2 kW	240 V	—	Oct 12, 2020
ECO10 {16kWh}	16 kWh	7.2 kW	240 V	—	Oct 12, 2020
ECO10 {17.5kWh}	17.5 kWh	7.2 kW	240 V	—	Oct 12, 2020
ECO10 {20kWh}	20 kWh	7.2 kW	240 V	—	Oct 12, 2020

CEC Energy Storage System List

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

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 Energy Storage System List · sonnen datasheet

CEC Energy Storage System List · sonnen datasheet

CEC Energy Storage System List

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

CEC Energy Storage System List

CEC Energy Storage System List · sonnen datasheet

CEC Energy Storage System List

Battery	Energy	Continuous power	Chemistry	Warranty	SoCal permits
Generac PWRcell	8.6–17.1 kWh	3.4–6.7 kW	Lithium Ion	—	8
Lunar Energy LE-ESS-xxKWH	15–20 kWh	9.6 kW	Lithium Ion	—	3
Panasonic EVHB-I7-Xxx	9–18 kWh	7.6 kW	Lithium Iron	12 years	2
sonnen SCORE-Pxx	10–20 kWh	4.8 kW	Lithium Iron Phosphate	10 years	2
Qcells Q.HOME+ ESS HYB-G1	13.5 kWh	6–8.6 kW	Lithium Ion	10 years	1
EG4 Electronics PP-16/280A1-18K1-AWLL	14.3 kWh	8.7–10 kW	Lithium Iron Phosphate	10 years	—

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

How much energy does the sonnen Tech Specs - sonnen eco Gen 3.1 store?

4–20 kWh nameplate, per the California Energy Commission list.

What warranty does the Tech Specs - sonnen eco Gen 3.1 have?

10 years (datasheet).

Is the Tech Specs - sonnen eco Gen 3.1 UL 9540 certified?

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

California Energy Commission — Energy Storage System List, data as of Oct 7, 2026. Manufacturer-reported values confirmed by CEC against certificates.
sonnen — manufacturer datasheet “Tech Specs–sonnen eco Gen 3.1 eco 51 eco 7.5 eco 101 eco 12.5 eco 15 eco 17.5 eco 20”.
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).