Huawei LUNA2000-S1
The Huawei LUNA2000-S1 stores 6.9 kWh usable. DC-coupled high-voltage battery: one control unit plus 1–3 battery modules, connected to a Huawei SUN2000 hybrid inverter. Running essentials only, a full SUN2000-3.68KTL-L1 + LUNA2000-7-S1 (6.9 kWh) lasts about 42 hours in a power cut.
A modular high-voltage battery with 6.9 kWh modules (1–3 per stack, up to 20.7 kWh). Used with Huawei's SUN2000 hybrid inverters.
Last checked 26 Sept 2026 · Sources listed at the bottom of the page
- Warranty figures are from Huawei's EU terms. Huawei publishes separate UK terms, but we couldn't get a current copy, so check the UK terms with your installer.
- Round-trip efficiency and depth of discharge aren't stated in the S1 manual.
- Huawei also sells 5 kWh S1 modules. We've listed the 6.9 kWh module only.
How long will it run your home?
Pick a setup and tick what you want to keep running. The maths is shown below the result.
Average draw 156 W from 6.56 kWh available.
Everything on at once: 415 W — within the 3.5 kW limit
- Starts from a full battery with 0% held back as reserve.
- 5% extra allowed for wiring and standby losses on top of the manufacturer's usable figure.
- Appliance figures are typical averages; your own may differ. Enter your own wattage for the most accurate result.
- Assumes no solar recharging during the outage.
Setups you can buy
| Setup | Usable energy | Continuous power |
|---|---|---|
| SUN2000-3.68KTL-L1 + LUNA2000-7-S1 (6.9 kWh) | 6.9 kWh | 3.5 kWcalculated |
| SUN2000-5KTL-L1 + LUNA2000-14-S1 (13.8 kWh) | 13.8 kWh | 5 kWcalculated |
| SUN2000-6KTL-L1 + LUNA2000-21-S1 (20.7 kWh) | 20.7 kWh | 5 kWcalculated |
Full specifications
| Specification | Value | Source |
|---|---|---|
| Capacity | ||
| Usable capacity (per unit) | 6.9 kWhPer LUNA2000-7-E1 module | Huawei manualp.127 |
| Total (nominal) capacity | Not documented in the sources we hold | |
| Depth of discharge | Not documented in the sources we hold | |
| Battery chemistry | LFP (LiFePO₄) | Huawei manualp.128, Cell |
| System | ||
| Maximum usable storage (expanded) | 20.7 kWhOne stack of 3 modules | Huawei manualp.127 |
| How it expands | 1–3 modules of 6.9 kWh per stack | Huawei manualp.127, Number of Energy Storage Modules |
| Maximum system power (expanded) | Not documented in the sources we hold | |
| Architecture | DC-coupled high-voltage battery: one control unit plus 1–3 battery modules, connected to a Huawei SUN2000 hybrid inverter | Huawei manualp.127, Performance |
| Grid connection | Single phase (with SUN2000-L1 inverters); three-phase inverters also supported | Huawei datasheetOutput (On Grid) |
| Power | ||
| Continuous power (per unit) | 3.5–10.5 kWBattery side: 3.5 kW (1 module), 7 kW (2), 10.5 kW (3). Your inverter may allow less. | Huawei manualp.127, Maximum output power |
| Peak power | Not documented in the sources we hold | |
| Peak duration | Not documented in the sources we hold | |
| Max charge power | Not documented in the sources we hold | |
| Round-trip efficiency | Not documented in the sources we hold | |
| Solar | ||
| Max solar input | 5.52–9 kWSUN2000-3.68KTL-L1: 5.52 kWp · 5KTL-L1: 7.5 kWp · 6KTL-L1: 9 kWp | Huawei datasheetInput (PV): Recommended max. PV power |
| Solar MPPT inputs | 2 | Huawei datasheetNumber of MPP trackers |
| Backup | ||
| Backup switchover time | Not documented in the sources we hold | |
| Backup needs | Huawei Backup Box-B0 or SmartGuard-63A-S0 | Huawei datasheetBackup power output |
| Physical | ||
| Ingress rating | IP66 | Huawei manualp.128 |
| Indoor / outdoor | Not documented in the sources we hold | |
| Operating temperature | −20°C to 55°C | Huawei manualp.128 |
| Dimensions | 590 × 360 × 255 per module; control unit 590 × 150 × 255W × H × D | Huawei manualp.128 |
| Weight | 68 kgPer module; control unit 10 kg; 3-module system 216 kg with floor bracket | Huawei manualp.128 |
| Mounting | Floor-mounted (standard) or wall-mounted (optional) | Huawei manualp.128, Installation mode |
| Warranty | ||
| Stated cycle life | Not documented in the sources we hold | |
| Warranty (UK) | 5–15 yearsmedium confidenceEU terms. 5 years basic; 15 years if the battery stays online with Huawei's FusionSolar monitoring | Huawei warrantyp.3, LUNA2000-7/14/21-S1 |
| Capacity guaranteed at end of warranty | 60%medium confidenceEU terms | Huawei warrantyp.3, Notice 1 |
| Warranty throughput limit | 28.84 MWhmedium confidencePer 6.9 kWh module, EU terms; whichever comes first | Huawei warrantyp.3, Minimum Through Output Energy |
| Warranty conditions | The long warranty needs internet connection for firmware updates (not offline for over 6 months) and FusionSolar registration. Must be installed and commissioned within a month of leaving the distributor, by a Huawei-certified or qualified installer.medium confidence | Huawei warrantyp.3, Notices 4–6 |
| Compliance | ||
| UK grid compliance | G98, G99 (SUN2000-L1 inverter) | Huawei datasheetGrid connection standards |
Questions people ask
How much usable capacity does the Huawei LUNA2000-S1 have?
6.9 kWh (Per LUNA2000-7-E1 module).
Can the Huawei LUNA2000-S1 be expanded?
1–3 modules of 6.9 kWh per stack. Maximum usable storage: 20.7 kWh.
How long will the Huawei LUNA2000-S1 run a house in a power cut?
Running essentials only (fridge-freezer, lights, Wi-Fi, TV and device charging, about 156 W on average), a full SUN2000-3.68KTL-L1 + LUNA2000-7-S1 (6.9 kWh) lasts roughly 42 hours. Heavy loads such as a heat pump, electric shower or EV charger cut this sharply. Use the calculator on this page with your own appliances.
What warranty does the Huawei LUNA2000-S1 have in the UK?
5–15 years, guaranteeing 60% of capacity or 28.84 MWh of throughput, whichever comes first. EU terms. 5 years basic; 15 years if the battery stays online with Huawei's FusionSolar monitoring.
What does the Huawei LUNA2000-S1 need to provide backup power?
Huawei Backup Box-B0 or SmartGuard-63A-S0.
Head-to-head comparisons
Huawei LUNA2000-S1 vs Tesla Powerwall 3
Capacity, power, warranty and runtime side by side.
Huawei LUNA2000-S1 vs Sigenergy SigenStor
Capacity, power, warranty and runtime side by side.
Other batteries
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myenergi libbi
A UK-designed modular battery with a 3.68 kW or 5 kW hybrid inverter and 1–4 battery modules (4.6 kWh usable each). Built to work with myenergi's zappi and eddi.
SolarEdge Home Battery 400V
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Sunsynk L5.1 with ECCO inverter
A 5.12 kWh, 48 V wall-mounted battery module (4.61 kWh usable) used with Sunsynk's ECCO hybrid inverters. Add modules in parallel for more storage.
Sources
- LUNA2000-(7/14/21)-S1 User Manual — Huawei, Issue 02. Retrieved 26 Sept 2026. Huawei's official manual, hosted by European distributor SKE Solar. Figures match Huawei's online spec page for the S1.
- SUN2000-2/3/3.68/4/4.6/5/6KTL-L1 Smart Energy Controller datasheet — Huawei, 04-202403. Retrieved 26 Sept 2026.
- Huawei Limited Product Warranty (EU warranty conditions) — Huawei, EU version 2024-03-01. Retrieved 26 Sept 2026. These are Huawei's EU terms (EEA and Switzerland). Huawei publishes separate UK terms, but the copy we found was no longer online.
Spotted an error? Every figure above links to the document it came from. See how we check data.