How much usable energy does the Fox ESS EQ4800-L9 (1 x EQ4800-M + 8 x EQ4800-S) store?

37.74 kWh (datasheet, de.fox-ess.com, read 28 Oct 2026), for this configuration: Max stack: 9 x 4.66 kWh modules in series (master EQ4800-M with BMS + 8 slave EQ4800-S), 403.2 V.

What is the round-trip efficiency of the Fox ESS EQ4800-L9 (1 x EQ4800-M + 8 x EQ4800-S)?

95 % (DC) (datasheet, de.fox-ess.com, read 28 Oct 2026). DC means the battery alone, without the inverter.

What warranty does the Fox ESS EQ4800-L9 (1 x EQ4800-M + 8 x EQ4800-S) have?

10 years (datasheet, de.fox-ess.com, read 28 Oct 2026). The warranty document's own terms decide which limit comes first.

Does the Fox ESS EQ4800-L9 (1 x EQ4800-M + 8 x EQ4800-S) include an inverter?

No. It is a battery without an integrated power conversion system, so it is paired with a separate battery or hybrid inverter (datasheet, de.fox-ess.com, read 28 Oct 2026).

How much does the Fox ESS EQ4800-L9 (1 x EQ4800-M + 8 x EQ4800-S) cost?

No public price listing was found for it when this database was compiled (28 Oct 2026). Zorowatt does not estimate prices.

Fox ESS

EQ4800-L9 (1 x EQ4800-M + 8 x EQ4800-S)

Max stack: 9 x 4.66 kWh modules in series (master EQ4800-M with BMS + 8 slave EQ4800-S), 403.2 V

Short answer

The Fox ESS EQ4800-L9 (1 x EQ4800-M + 8 x EQ4800-S) is an LFP residential-class battery also sold for small commercial sites (as specified: Max stack: 9 x 4.66 kWh modules in series (master EQ4800-M with BMS + 8 slave EQ4800-S), 403.2 V). Usable energy: 37.74 kWh. Max. discharge power: 20.16 kW. Round-trip efficiency: 95 % (DC). Warranty: 10 years.

Each figure is in the table below with its source and the day it was read.

Specifications

Spec	Value	Source
Chemistry	LFP	de.fox-ess.comDatasheet · read 28 Oct 2026
Usable energy	37.74 kWhderived: 41.93 kWh x 90% DoD	de.fox-ess.comDatasheet · read 28 Oct 2026
Nominal energy	41.93 kWh	de.fox-ess.comDatasheet · read 28 Oct 2026
Max. discharge power	20.16 kWderived: 50 A x 403.2 V (DC)	de.fox-ess.comDatasheet · read 28 Oct 2026
Max. charge power	20.16 kWderived: max current 50 A x 403.2 V (DC); recommended 30 A -> 12.1 kW; peak 65 A/60 s	de.fox-ess.comDatasheet · read 28 Oct 2026
C-rate	0.29 Cderived: recommended current 30 A / 104 Ah (max 50 A = 0.48C)	de.fox-ess.comDatasheet · read 28 Oct 2026
Round-trip efficiency	95 % (DC)'Lade-/Entlade-Effizienz der Batterie >95%' (battery charge/discharge efficiency)	de.fox-ess.comDatasheet · read 28 Oct 2026
Depth of discharge	90 %EU (DE) datasheet 90%; AU datasheets / compatibility list state max 100% DoD	de.fox-ess.comDatasheet · read 28 Oct 2026
Cycle life	6,000 cyclesConditions: >=6000 @25C, @70% SOH, @90% DOD, 0.3C charge/dischargeAU 2026 datasheet lists different cycle figures (region-specific)	de.fox-ess.comDatasheet · read 28 Oct 2026
Warranty	10 years'Standard-Garantie 10 Jahre' - refers to Fox ESS Battery Warranty Terms (not retrieved)	de.fox-ess.comDatasheet · read 28 Oct 2026
Warranty cycles	unavailable	Not published
Warranty throughput	unavailable	Not published
Capacity at end of warranty	unavailable	Not published
Nominal voltage	403.2 V	de.fox-ess.comDatasheet · read 28 Oct 2026
Operating temperature	−10 to 55 °C; charging 0 to 55 °C	de.fox-ess.comDatasheet · read 28 Oct 2026
Dimensions (W × D × H)	570 × 380 × 1,352 mm9-module stack	de.fox-ess.comDatasheet · read 28 Oct 2026
Weight	356.5 kg	de.fox-ess.comDatasheet · read 28 Oct 2026
Ingress protection	IP65	de.fox-ess.comDatasheet · read 28 Oct 2026
Integrated inverter (PCS)	No, battery only	de.fox-ess.comDatasheet · read 28 Oct 2026
Scalability	2-9 modules in series (EQ4800-L2..L9)	de.fox-ess.comDatasheet · read 28 Oct 2026
Certifications	IEC 62619, EN IEC 61000-6-1/2/3/4, UN 38.3	de.fox-ess.comDatasheet · read 28 Oct 2026
Compatible inverters	Fox ESS H1-G2, Fox ESS KH, Fox ESS H3 SMART, Fox ESS H3 PRO (min 1M+3S)Fox ESS AU compatibility list (2026-03-19)	au.fox-ess.comManufacturer page · read 28 Oct 2026

Datasheetde.fox-ess.comversion V1.1 · dated 2025-03-20 · read 28 Oct 2026

Notes

Residential HV stack also used with Fox H3 PRO for small commercial. Group list mentioned ECS series; ECS4100 NL datasheet download returned empty, EQ4800 taken as current HV line.

Sold in: EU, AU

Prices

No public price listing was found when this database was compiled (28 Oct 2026). Zorowatt does not estimate prices.

Questions

How much usable energy does the Fox ESS EQ4800-L9 (1 x EQ4800-M + 8 x EQ4800-S) store?: 37.74 kWh (datasheet, de.fox-ess.com, read 28 Oct 2026), for this configuration: Max stack: 9 x 4.66 kWh modules in series (master EQ4800-M with BMS + 8 slave EQ4800-S), 403.2 V.
What is the round-trip efficiency of the Fox ESS EQ4800-L9 (1 x EQ4800-M + 8 x EQ4800-S)?: 95 % (DC) (datasheet, de.fox-ess.com, read 28 Oct 2026). DC means the battery alone, without the inverter.
What warranty does the Fox ESS EQ4800-L9 (1 x EQ4800-M + 8 x EQ4800-S) have?: 10 years (datasheet, de.fox-ess.com, read 28 Oct 2026). The warranty document's own terms decide which limit comes first.
Does the Fox ESS EQ4800-L9 (1 x EQ4800-M + 8 x EQ4800-S) include an inverter?: No. It is a battery without an integrated power conversion system, so it is paired with a separate battery or hybrid inverter (datasheet, de.fox-ess.com, read 28 Oct 2026).
How much does the Fox ESS EQ4800-L9 (1 x EQ4800-M + 8 x EQ4800-S) cost?: No public price listing was found for it when this database was compiled (28 Oct 2026). Zorowatt does not estimate prices.

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