Huawei Huawei LUNA2000-21-S1

Name: Huawei LUNA2000-21-S1
Brand: Huawei
Author: JouleSpecs

Estimated price range

5000–11000 € ≈ $5,400–$11,880

An editorial estimate, not a selling price

JouleSpecs does not sell and does not show shop prices: check the price where you buy.

Sheet on the Huawei website →

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Data from official source

Sheet curated by JouleSpecs — We check every spec sheet against the manufacturer's own documentation: each value carries its source and the date we read it. Published Sept. 23, 2026 · Last updated Oct. 6, 2026 · Data verified Sept. 23, 2026

Huawei LUNA2000-21-S1 is a high-voltage residential battery with no inverter of its own: it works together with a Huawei SUN2000 or SUN5000 inverter and doesn't generate AC current on its own.

With three battery modules stacked one above the other, each individual module works with its own energy optimizer: that's what lets the system stay close to its rated capacity instead of losing margin to the imbalance between a more charged module and a less charged one. It withstands -20 to +55°C and works outdoors too, and when the sun isn't enough it charges from the grid.

The basic warranty lasts five years; the extra ten years provided for Europe stay active only if the system remains connected to its own online service: disconnecting it for more than six months voids that part.

01 · Verified data

Technical specifications

Usable capacity 20.7 kWh

Cell chemistry LFP (lithium iron phosphate)

Cost per kWh 386,47 €/kWh

midpoint of the estimated range — on nominal capacity; on usable capacity it is 386,47 €/kWh

Round-trip efficiency Huawei does not state it.

where we looked

Standby consumption Huawei does not state it.

where we looked

Parameter	Value	Source
Dimensions	59 × 25.5 × 123 cm (23.2 × 10.0 × 48.4 in)	manufacturer website
Weight	216.0 kg (476.2 lb)	manufacturer website
Usable capacity	20.7 kWh	Declared by the brand
Nominal capacity	20.7 kWh	Declared by the brand
Depth of discharge	100 %	Declared by the brand
Cell chemistry	LFP (lithium iron phosphate)	Declared by the brand
Expandable	Yes	Declared by the brand
Declared compatible inverters	Solo inverter Huawei — SUN2000-2/3/3.68/4/4.6/5/6KTL-L1, SUN2000-3/3.68/4/4.6/5/6K-LB0, SUN2000-8/10K-LC0, SUN2000-3/4/5/6/8/10KTL-M1, SUN2000-5/6/8/10/12K-MAP0, SUN2000-12/15/17/20/25K-MB0, SUN5000-3/6K-LB0, SUN5000-8/12K-MAP0, SUN5000-17/25K-MB0	Declared by the brand
Maximum charge power	10.5 kW	Declared by the brand
Grid charging	Yes	Declared by the brand
Rated cycles	5000 cicli	Declared by the brand
Capacity at end of cycle life	80 %	Declared by the brand
Warranty	5 anni	Declared by the brand
Guaranteed throughput	28.84 MWh	Declared by the brand
Guaranteed remaining capacity	60 %	Declared by the brand
Ingress protection	IP66	Declared by the brand
Mounting	Floor standing	Declared by the brand
Minimum temperature	-20 °C	Declared by the brand
Maximum temperature	55 °C	Declared by the brand
Noise level	29 dB	Declared by the brand
Works without internet	With limitations	Declared by the brand
App required for setup	Yes	Declared by the brand
Declared standards	CE, UN 38.3, IEC 62619	Declared by the brand
Cell supplier	—	Not declared
Maximum expanded capacity	—	Not declared
Battery voltage	—	Not declared
Continuous output	—	Not applicable
Phases	—	Not applicable
Backup power	—	Not applicable
Backup phases	—	Not applicable
Switchover time	—	Not applicable
Black start	—	Not applicable
Dynamic tariffs	—	Not declared
EV charger integration	—	Not declared
Heat pump integration	—	Not declared
Virtual power plant	—	Not declared
Round-trip efficiency	—	Not declared
Standby consumption	—	Not declared
Cell heating	—	Not declared
Local control	—	Not applicable
Open protocols	—	Not applicable
Home Assistant integration	—	Not applicable
Where the data is hosted	—	Not declared
Remote updates	—	Not declared
Battery passport	—	Not declared
Carbon footprint	—	Not declared
Recycled content	—	Not declared
Grid connection power	—	Not applicable
Official list price	—	Not declared

Which documents this page rests on

36414e3c762a4e508d6fde579866c4c0 39 rows of the table
7fa828aede004fb1b1658929a49d6242 3 rows of the table
d373d9834172413b85d346e1f691915d 3 rows of the table
LUNA2000 7 14 21 S1 2 rows of the table

A manual or a datasheet counts as a source even when the original file is hosted elsewhere: what matters is the document, not the server. Where that happens, it is stated above.

02 · The numbers

What it really costs

Cost per kWh 386.470 €/kWh midpoint of the estimated range — on nominal capacity; on usable capacity it is 386,47 €/kWh

How we worked it out

price: 8000
nominal capacity: 20.700

Battery life cycles 1393 cycles guaranteed energy throughput

How we worked it out

stated cycles: 5000
warranty years: 1825
guaranteed energy throughput: 1393

Cost of stored energy 0.277 €/kWh guaranteed energy throughput

without conversion losses, which the manufacturer does not state: the real cost is higher

How we worked it out

price: 8000
usable capacity: 20.700
battery life cycles: 1393
round-trip efficiency: 100
energy delivered over the whole life: 28835

Energy density 95.800 Wh/kg

How we worked it out

usable capacity: 20.700
weight: 216

These numbers are calculated, not stated: they have no source to cite, they have a formula you can redo. The price used is the manufacturer's list price, which is stable and the same in every country — not a shop's price on the day.

03 · Summary

Pros and cons

In favour

Up to 4 systems can run in parallel, but only with the SUN2000-12/15/17/20/25K-MB0 inverters.
It's rated IP66: it withstands dust and water jets, so it can sit outside the home too.
It also charges from the grid, not only from solar.

Worth knowing

Charging from the grid has to be enabled in line with the grid-charging requirements set by local regulations.
It only works paired with a Huawei SUN2000 or SUN5000 inverter: it doesn't install on a system from another brand.
Half the warranty provided for Europe, ten of the fifteen years, is tied to staying connected: it isn't automatic like the first five.

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