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Vault – Battery 1920Wh

Name: Vault – Battery 1920Wh
Brand: Thunder

Price

£899.99

Smart, portable home battery for solar, backup, and beyond

Quantity

Description

Vault is a next-generation micro energy storage system designed for maximum flexibility and convenience. Built specifically for small home setups, it brings intelligent energy management to your everyday life.

It connects seamlessly to any home socket or microinverter for truly effortless integration thanks to advanced AC-coupling technology.

Engineered with bidirectional charging and discharging technology, Vault supports multiple operating modes including self-consumption and AI-driven Time-of-Use (TOU) optimization. With up to 96.5% bidirectional efficiency and 87% round-trip efficiency, it ensures maximum utilization of every watt of stored energy, meaning cutting bills and boosting solar returns.

Safety and reliability are at the core of its design. Vault uses premium LiFePO₄ cells rated for over 6,000 cycles, featuring an internal fire-suppression system, pressure-relief valves, and IP66 waterproof & dustproof protection. Its built-in self-heating system ensures reliable performance even in freezing conditions, while natural cooling keeps operation whisper-quiet at less than 17 dB(A).

Key Specs

• Battery Capacity: 1.92 kWh (LiFePO₄)
• Rated Output Power: 800 VA (adjustable up to 2000 VA via app)
• Peak Output Power: 1200 VA (10 seconds)
• Battery Life Cycle: ≥ 6000 cycles
• Efficiency: 96.5% bidirectional / 87% round-trip
• Voltage & Frequency: 230 V AC, 50 Hz
• Protection Level: IP66 (waterproof & dustproof)
• Cooling: Natural convection, fanless (<17 dB)
• Operating Temperature: −20 °C to +55 °C
• Dimensions: 460 × 240 × 203 mm
• Weight: 24 kg
• Mounting Options: Wall-mounted or floor-mounted
• Connectivity: Bluetooth & 2.4 GHz Wi-Fi
• App Control: S-Miles Home App
• Warranty: 10 years
• Compliance: IEC 62477-1 / IEC 62619 / IEC 63056 / UN 38.3 / VDE-AR-N 4105 (2018)

Documents

Datasheet

User Manual

20-Year Financial Projection

Storm 710W Solar Kit With Battery

System Size

0.71 kWp

4 × Storm 178W

Year 1 Generation

525 kWh

London estimate

Year 1 Savings

£298

At 30p/kWh

Payback Period

~5 Years

April '26 prices

20-year financial projection Chart With Battery.png

Year-by-Year Breakdown

Year	Elec rate (p/kWh)	Generation (kWh)	Self-use (kWh)	Self-use savings (£)	Battery arbitrage (£)	Annual total (£)	Cumulative (£)
1	30.00	525	525	£157	£140	£298	£298
2	30.90	521	521	£161	£144	£305	£603
3	31.83	517	517	£165	£149	£313	£916
4	32.78	514	514	£168	£153	£322	£1,238
5	33.77	510	510	£172	£158	£330	£1,568
6	34.78	506	506	£176	£163	£339	£1,907
7	35.82	503	503	£180	£167	£348	£2,254
8	36.90	499	499	£184	£172	£357	£2,611
9	38.00	496	496	£188	£178	£366	£2,977
10	39.14	492	492	£193	£183	£376	£3,353
11	40.32	489	489	£197	£188	£386	£3,738
12	41.53	486	486	£202	£194	£396	£4,134
13	42.77	482	482	£206	£200	£406	£4,540
14	44.06	479	479	£211	£206	£417	£4,957
15	45.38	475	475	£216	£212	£428	£5,385
16	46.74	472	472	£221	£218	£439	£5,824
17	48.14	469	469	£226	£225	£451	£6,275
18	49.59	465	465	£231	£232	£463	£6,737
19	51.07	462	462	£236	£239	£475	£7,212
20	52.61	459	459	£241	£246	£487	£7,699

Annual consumption: 2,700 kWh (Ofgem typical medium household). Winter 60% / Summer 40%.
System: 4 x Storm 178W flexible solar panels (TopCon monocrystalline), total 0.71 kWp. Microinverter: Hoymiles HMS-800W-2T (800 VA, 2 MPPT, 96.7% peak efficiency).
Orientation: Modelled at 90-degree vertical mounting (typical for fence or balcony railing). This is a conservative estimate. Tilting panels to a more favourable angle will increase generation.
Year 1 generation: 525 kWh (estimated for London, based on typical balcony/fence mounting).
Panel degradation: 2% in year 1, 0.7%/year thereafter (conservative estimate for flexible ETFE panels).
Seasonal generation split: Winter 28% / Summer 72% (Thames region profile).
Self-consumption rate: 100% year-round. System output is well below household demand, so all generation is consumed on-site.
Electricity tariff: 30 p/kWh peak (average smart time-of-use daytime rate), 7 p/kWh off-peak (overnight rate), 3% annual inflation.
Battery: Hoymiles HiBattery 1920 AC (HB-1920-AC-SV), 1.92 kWh usable capacity, LiFePO4 cells, AC-coupled, 87% round-trip efficiency, IP66, 6,000+ cycle life, 10-year warranty.
Battery arbitrage: Off-peak grid charging at overnight rates, peak discharge during daytime. 365 days per year at full capacity (1.92 kWh). Solar generation is consumed directly by the household and does not charge the battery, leaving full battery capacity available for grid arbitrage year-round. Battery operates at 800W maximum output, sufficient to offset household base load during peak hours.
87% round-trip efficiency.

Battery arbitrage savings assume the customer is on a smart time-of-use tariff with off-peak overnight rates. Actual returns may be higher or lower than projected
depending on tariff availability and usage patterns. All figures are estimates based on the assumptions above and should not be considered as guaranteed
returns.