What is the round-trip efficiency of the Sigenergy SigenStack BAT 12.0 x21 + SigenStack BC M2 (max system, 253 kWh)?

The round-trip efficiency is unavailable: it was not found in the manufacturer's documents or other sources checked for this database (compiled 28 Oct 2026).

Sigenergy

SigenStack BAT 12.0 x21 + SigenStack BC M2 (max system, 253 kWh)

Maximum per-inverter system: 21 x SigenStack BAT 12.0 across multiple stacks (max 7 per stack) with one BC M2 controller and 4S base; DC-coupled to one Sigen C&I hybrid inverter.

Cell supplier not stated.

Short answer

The Sigenergy SigenStack BAT 12.0 x21 + SigenStack BC M2 (max system, 253 kWh) is an LFP modular battery rack (as specified: Maximum per-inverter system: 21 x SigenStack BAT 12.0 across multiple stacks (max 7 per stack) with one BC M2 controller and 4S base; DC-coupled to one Sigen C&I hybrid inverter). Usable energy: 245.7 kWh. Max. discharge power: unavailable. Round-trip efficiency: unavailable. 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	stralendgroen.nlDatasheet · read 28 Oct 2026
Usable energy	245.7 kWhderived: 21 x 11.70 kWh usable per module (warranty v1.1)	res.cloudinary.comManufacturer page · read 28 Oct 2026
Nominal energy	253 kWhMax system energy capacity (21 x 12.06 = 253.26)	stralendgroen.nlDatasheet · read 28 Oct 2026
Max. discharge power	unavailableSee max_charge_kw	Not published
Max. charge power	unavailableDC power limited by BC (180 A max, 550-1100 V) and connected inverter (max 125 kW); no explicit system kW in datasheet	Not published
C-rate	0.5 CNominal module rate 0.5C; effective system C-rate limited by inverter size (derived ~0.5 with 125 kW inverter)	stralendgroen.nlDatasheet · read 28 Oct 2026
Round-trip efficiency	unavailable	Not published
Depth of discharge	97 %derived: 11.70/12.06	res.cloudinary.comManufacturer page · read 28 Oct 2026
Cycle life	10,000 cyclesConditions: Cell manufacturer figure, 25+/-2 C, 0.5C, SOH=60%	stralendgroen.nlDatasheet · read 28 Oct 2026
Warranty	10 yearsEurope advanced warranty (Sigen Cloud connection required); basic 2 years	res.cloudinary.comManufacturer page · read 28 Oct 2026
Warranty cycles	5,000 cycles0.5C: 5000; 0.5-1C: 3500	res.cloudinary.comManufacturer page · read 28 Oct 2026
Warranty throughput	unavailable	Not published
Capacity at end of warranty	70 %	res.cloudinary.comManufacturer page · read 28 Oct 2026
Nominal voltage	unavailableNot in datasheet	Not published
Operating temperature	−20 to 55 °C	stralendgroen.nlDatasheet · read 28 Oct 2026
Dimensions (W × D × H)	unavailableMulti-stack layout; per-stack footprint 770 x 363 mm, 7-module stack 2543 mm high	Not published
Weight	unavailableNot given for 21-module system; 105 kg per module, 7-module stack 815 kg	Not published
Ingress protection	IP66	stralendgroen.nlDatasheet · read 28 Oct 2026
Integrated inverter (PCS)	No, battery only	stralendgroen.nlDatasheet · read 28 Oct 2026
Scalability	21 modules = max per system; up to 3 HYB inverters in parallel	stralendgroen.nlDatasheet · read 28 Oct 2026
Certifications	IEC/EN 60730-1, UN 38.3, IEC/EN 62619, IEC/EN 63056, IEC/EN 62040, UL 9540A	stralendgroen.nlDatasheet · read 28 Oct 2026
Compatible inverters	Sigen PV 50/60/80/100/110/125 M1-HYA, Sigen PV 50/60/80/100/110 M1-HYB	portal.segen.co.ukDatasheet · read 28 Oct 2026

Datasheetstralendgroen.nlversion 20260224 · dated 2026-02-24 · read 28 Oct 2026

Notes

Representative max configuration of the SigenStack family; see sigenergy-sigenstack-84 for source caveats.

Sold in: EU, GB

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 Sigenergy SigenStack BAT 12.0 x21 + SigenStack BC M2 (max system, 253 kWh) store?: 245.7 kWh (manufacturer page, res.cloudinary.com, read 28 Oct 2026), for this configuration: Maximum per-inverter system: 21 x SigenStack BAT 12.0 across multiple stacks (max 7 per stack) with one BC M2 controller and 4S base; DC-coupled to one Sigen C&I hybrid inverter.
What is the round-trip efficiency of the Sigenergy SigenStack BAT 12.0 x21 + SigenStack BC M2 (max system, 253 kWh)?: The round-trip efficiency is unavailable: it was not found in the manufacturer's documents or other sources checked for this database (compiled 28 Oct 2026).
What warranty does the Sigenergy SigenStack BAT 12.0 x21 + SigenStack BC M2 (max system, 253 kWh) have?: 10 years, 5,000 cycles, 70 % of capacity at the end (manufacturer page, res.cloudinary.com, read 28 Oct 2026). The warranty document's own terms decide which limit comes first.
Does the Sigenergy SigenStack BAT 12.0 x21 + SigenStack BC M2 (max system, 253 kWh) 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, stralendgroen.nl, read 28 Oct 2026).
How much does the Sigenergy SigenStack BAT 12.0 x21 + SigenStack BC M2 (max system, 253 kWh) 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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