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Vault 1.92 kWh Plug-In Home Battery

Price

£1,049.99

1.92 kWh smart LiFePO₄ home battery

Store solar or lower-cost off-peak energy

Smart control via S-Miles Home

10-year warranty

Battery Mounting Set
Installation

Quantity

Description

Smart Battery Storage for Your Home

Vault is Thunder's compact 1.92 kWh home battery, powered by Hoymiles technology and designed for flexible residential energy storage. Pair it with a solar system to store more of the energy you generate, or use smart tariff charging to store lower-cost electricity for later.

Advanced AC-coupling makes Vault easy to integrate with compatible solar systems and microinverters without changing the DC side of your existing setup.

Store Solar and Use It Later

Instead of relying only on solar while your panels are generating, Vault lets you store available energy for use later in the day. Self-consumption mode helps you make better use of your own solar generation, while Time-of-Use operation can shift charging and discharging around your electricity tariff.

Smart Energy Management

The Hoymiles HiBattery 1920 AC platform delivers up to 96.5% bidirectional efficiency and 87% round-trip efficiency. Built-in Wi-Fi and Bluetooth connect Vault to the S-Miles Home app, giving you control over battery status, charging, discharging and operating modes from your phone.

LiFePO₄ Battery Built for Long-Term Use

Vault uses LiFePO₄ battery cells rated for at least 6,000 cycles and includes integrated battery management, self-heating for low-temperature operation, an internal fire-suppression system and pressure-relief protection.

Compact and Quiet

At just 460 × 240 × 203 mm, Vault stores 1.92 kWh in a compact format suitable for wall or floor installation. IP66 protection, natural fanless cooling and operating noise below 17 dB(A) make it suitable for a wide range of home energy storage installations.

Expandable Storage

Need more capacity later? Two Vault batteries can be connected in one system to increase total storage to 3.84 kWh, giving you a straightforward upgrade path as your energy needs grow.

Key Specs

• Battery Capacity: 1.92 kWh LiFePO₄
• On-Grid Output: 800 VA nominal, configurable up to 2000 VA via S-Miles Home
• Battery Charge / Discharge Power: up to 1000 VA
• Off-Grid Peak Output: 1200 VA for 10 seconds
• Battery Life Cycle: ≥ 6000 cycles
• Efficiency: 96.5% bidirectional / 87% round-trip
• Nominal Voltage & Frequency: 230 V AC, 50 Hz
• Protection Level: IP66
• Cooling: Natural convection, fanless, <17 dB(A)
• Charge / Discharge Temperature: −20°C to +55°C
• Dimensions: 460 × 240 × 203 mm
• Weight: 24 kg
• Mounting: Wall or floor mounting
• Connectivity: Bluetooth & 2.4 GHz Wi-Fi
• App Control: S-Miles Home
• Warranty: 10 years
• Compliance: IEC 62477-1 / IEC 62619 / IEC 63056 / UN 38.3 / VDE-AR-N 4105:2018

FAQs

What is Vault?
Vault is Thunder's 1.92 kWh smart home battery, based on the Hoymiles HiBattery 1920 AC platform. It can store solar energy or lower-cost grid electricity for use later.

Can Vault work with my existing solar panels?
Yes. Vault is AC-coupled, so it can work alongside compatible existing solar systems without connecting directly to the solar panels themselves. This makes it particularly useful for microinverter and retrofit solar installations.

Can Vault charge from the grid?
Yes. Vault supports Time-of-Use operation, allowing it to charge during lower-cost tariff periods and discharge when electricity is more expensive.

How much energy does Vault store?
Vault provides 1.92 kWh of LiFePO₄ battery capacity and is rated for at least 6,000 battery cycles.

Can I control the battery from my phone?
Yes. Vault uses the S-Miles Home app with built-in Wi-Fi and Bluetooth, allowing you to monitor battery status and manage charging, discharging and operating modes.

Can I add another battery later?
Yes. Two Vault batteries can be combined in one system to provide up to 3.84 kWh of total battery storage.

Is Vault suitable for outdoor installation?
Vault has an IP66-rated enclosure. Installation should still follow the Hoymiles guidance, including protecting the battery from direct sunlight and rainfall and maintaining the required ventilation clearances.

How quiet is Vault?
Vault uses natural convection cooling with no cooling fan and operates at less than 17 dB(A), making it extremely quiet during normal operation.

Does Vault have a warranty?
Yes. The Hoymiles HiBattery 1920 AC supplied as Vault carries a 10-year manufacturer warranty.

Know before you buy

Storm Panel Dimensions

80 cm

DSC_5873 _edited_edited_edited.png

120 cm

BOLT: Plug-in solar made for UK homes

DSC_2954.jpg

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
    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.

20-Year Financial Projection

Bolt 400W Solar Kit With Battery

System Size

0.40 kWp

1 x Bolt 400W

Year 1 Generation

445 kWh

London estimate

Year 1 Savings

£267

At 30p/kWh

Payback Period

~5 Years

July '26 prices

Bolt Plus 400W.png
  • Year
    Elec rate (p/kWh)
    Generation (kWh)
    Self-use (kWh)
    Self-use savings (£)
    Battery arbitrage (£)
    Annual total (£)
    Cumulative (£)
    1
    30.00
    445
    445
    £133
    £134
    £267
    £267
    2
    30.90
    443
    443
    £137
    £138
    £275
    £542
    3
    31.83
    441
    441
    £140
    £142
    £283
    £825
    4
    32.78
    439
    439
    £144
    £147
    £291
    £1,116
    5
    33.77
    437
    437
    £148
    £151
    £299
    £1,414
    6
    34.78
    436
    436
    £152
    £155
    £307
    £1,721
    7
    35.82
    434
    434
    £155
    £160
    £316
    £2,037
    8
    36.90
    432
    432
    £159
    £165
    £324
    £2,361
    9
    38.00
    430
    430
    £164
    £170
    £334
    £2,695
    10
    39.14
    429
    429
    £168
    £175
    £343
    £3,038
    11
    40.32
    427
    427
    £172
    £180
    £352
    £3,390
    12
    41.53
    425
    425
    £177
    £186
    £362
    £3,752
    13
    42.77
    424
    424
    £181
    £191
    £372
    £4,125
    14
    44.06
    422
    422
    £186
    £197
    £383
    £4,508
    15
    45.38
    420
    420
    £191
    £203
    £394
    £4,901
    16
    46.74
    419
    419
    £196
    £209
    £405
    £5,306
    17
    48.14
    417
    417
    £201
    £215
    £416
    £5,722
    18
    49.59
    415
    415
    £206
    £222
    £428
    £6,150
    19
    51.07
    414
    414
    £211
    £228
    £440
    £6,589
    20
    52.61
    412
    412
    £217
    £235
    £452
    £7,041
  • System: 1 x Bolt 400W rigid solar panel (monocrystalline TOPCon), total 0.40 kWp. Microinverter: Hoymiles HMS-800-2WB (800 VA, 2 MPPT, 96.7% peak efficiency).

    Orientation: Modelled at 40-degree tilt, azimuth -6 degrees (near due south), the optimal configuration for London. A ground, wall or balcony frame allows this angle to be set. Output will be lower at other orientations.

    Specific yield: 1,122 kWh/kWp/year (PVGIS simulation for London at 40-degree tilt, azimuth -6 degrees, less a 3% allowance for soiling and real-world inverter efficiency).

    Year 1 generation: 445 kWh.

    Panel degradation: 1% in year 1, 0.4%/year thereafter (standard N-type TOPCon performance warranty).

    Seasonal generation split: Winter 33% / Summer 67% (derived from PVGIS monthly output at 40-degree tilt for London).

    Self-consumption rate: 100% year-round (blended 100%). System output stays below household demand and the battery absorbs any short-term surplus, so all generation is consumed on site.

    Annual consumption: 2,700 kWh (Ofgem typical medium household). Winter 60% / Summer 40%.

    Electricity tariff: 30 p/kWh peak (smart time-of-use daytime rate), 8 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 the day. 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 800 W maximum output, sufficient to offset household base load during peak hours. 87% round-trip efficiency.

    Export: No export income is included in this projection.

    Basis of calculation: Figures are modelled on a 400 W single-panel system with a 1.92 kWh battery.

    -

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.

20-Year Financial Projection

Bolt 900W Solar Kit With Battery

System Size

0.93 kWp

2 x 465 W

Year 1 Generation

1,013 kWh

London estimate

Year 1 Savings

£373

At 30p/kWh

Payback Period

~4 Years

July '26 prices

Bolt Plus 900W.png
  • Year
    Elec rate (p/kWh)
    Generation (kWh)
    Self-use (kWh)
    Self-use savings (£)
    Battery arbitrage (£)
    Annual total (£)
    Cumulative (£)
    1
    30.00
    1,013
    911
    £273
    £100
    £373
    £373
    2
    30.90
    1,009
    907
    £280
    £103
    £384
    £757
    3
    31.83
    1,005
    904
    £288
    £106
    £394
    £1,151
    4
    32.78
    1,001
    900
    £295
    £109
    £405
    £1,555
    5
    33.77
    997
    897
    £303
    £113
    £415
    £1,971
    6
    34.78
    993
    893
    £311
    £116
    £427
    £2,398
    7
    35.82
    989
    889
    £319
    £120
    £438
    £2,836
    8
    36.90
    985
    886
    £327
    £123
    £450
    £3,286
    9
    38.00
    981
    882
    £335
    £127
    £462
    £3,748
    10
    39.14
    977
    879
    £344
    £131
    £475
    £4,223
    11
    40.32
    973
    875
    £353
    £135
    £487
    £4,710
    12
    41.53
    969
    872
    £362
    £139
    £501
    £5,211
    13
    42.77
    965
    868
    £371
    £143
    £514
    £5,725
    14
    44.06
    961
    865
    £381
    £147
    £528
    £6,253
    15
    45.38
    958
    861
    £391
    £151
    £542
    £6,795
    16
    46.74
    954
    858
    £401
    £156
    £557
    £7,352
    17
    48.14
    950
    854
    £411
    £161
    £572
    £7,924
    18
    49.59
    946
    851
    £422
    £166
    £588
    £8,512
    19
    51.07
    942
    848
    £433
    £170
    £603
    £9,115
    20
    52.61
    939
    844
    £444
    £176
    £620
    £9,735
  • System: 2 x 465 W rigid solar panels (N-type monocrystalline TOPCon, dual glass), total 0.93 kWp. Microinverter: Hoymiles HMS-800-2WB (800 VA, 2 MPPT, 96.7% peak efficiency), one panel per MPPT input.

    Orientation: Modelled at 40-degree tilt, azimuth -6 degrees (near due south), the optimal configuration for London. A ground, wall or balcony frame allows this angle to be set. Output will be lower at other orientations..

    Specific yield: 1,100 kWh/kWp/year (PVGIS simulation for London at 40-degree tilt, azimuth -6 degrees, less a 3% allowance for soiling and real-world inverter efficiency, and a further 2% for microinverter clipping as 930 Wp of panels feed an 800 VA microinverter).

    Year 1 generation: 1,013 kWh.

    Panel degradation: 1% in year 1, 0.4%/year thereafter (standard N-type TOPCon performance warranty).

    Seasonal generation split: Winter 33% / Summer 67% (derived from PVGIS monthly output at 40-degree tilt for London).

    Self-consumption rate: Winter 100% / Summer 85% (blended 90%). The battery stores midday summer surplus that would otherwise be unusable, raising on-site consumption well above an equivalent system without storage.

    Annual consumption: 2,700 kWh (Ofgem typical medium household). Winter 60% / Summer 40%.

    Electricity tariff: 30 p/kWh peak (smart time-of-use daytime rate), 8 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 the day. 180 winter days at full capacity (1.92 kWh) and 185 summer days at 50% capacity, as surplus solar charges part of the battery during summer daylight hours and that value is already counted in the self-consumption figure. Battery operates at 800 W maximum output, sufficient to offset household base load during peak hours. 87% round-trip efficiency.

    Export: No export income is included in this projection.

    Basis of calculation: Figures are modelled on a 930 W (2 x 465 W) system with a 1.92 kWh battery.

    -

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.

20-Year Financial Projection

Storm 710W Solar Kit

System Size

0.71 kWp

4 × Storm 178W

Year 1 Generation

525 kWh

London estimate

Year 1 Savings

£131

At 25p/kWh

Payback Period

~5 Years

April '26 prices

20-year financial projection Chart.png
  • Year
    Elec rate (p/kWh)
    Generation (kWh)
    Self-use (kWh)
    Annual savings (£)
    Cumulative (£)
    1
    25
    525
    525
    £131
    £131
    2
    25.75
    521
    521
    £134
    £265
    3
    26.52
    517
    517
    £137
    £403
    4
    27.32
    514
    514
    £140
    £543
    5
    28.14
    510
    510
    £144
    £686
    6
    28.98
    506
    506
    £147
    £833
    7
    29.85
    503
    503
    £150
    £983
    8
    30.75
    499
    499
    £153
    £1,137
    9
    31.67
    496
    496
    £157
    £1,294
    10
    32.62
    492
    492
    £160
    £1,454
    11
    33.6
    489
    489
    £164
    £1,619
    12
    34.61
    486
    486
    £168
    £1,787
    13
    35.64
    482
    482
    £172
    £1,959
    14
    36.71
    479
    479
    £176
    £2,134
    15
    37.81
    475
    475
    £180
    £2,314
    16
    38.95
    472
    472
    £184
    £2,498
    17
    40.12
    469
    469
    £188
    £2,686
    18
    41.32
    465
    465
    £192
    £2,878
    19
    42.56
    462
    462
    £197
    £3,075
    20
    43.84
    459
    459
    £201
    £3,276
  • 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: 25 p/kWh (Ofgem price cap, April 2026), 3% annual inflation assumed.

Actual returns may be higher or lower than projected depending on tariff changes and usage patterns. All figures are estimates based on the assumptions above
and should not be considered as guaranteed returns.

20-Year Financial Projection

Bolt 400W Solar Kit

System Size

0.40 kWp

1 x Bolt 400W

Year 1 Generation

445 kWh

London estimate

Year 1 Savings

£112

At 26p/kWh

Payback Period

~5 Years

July '26 prices

Bolt 400W.png
  • Year
    Elec rate (p/kWh)
    Generation (kWh)
    Self-use (kWh)
    Annual savings (£)
    Cumulative (£)
    1
    26.00
    445
    430
    £112
    £112
    2
    26.78
    443
    428
    £115
    £226
    3
    27.58
    441
    426
    £118
    £344
    4
    28.41
    439
    424
    £121
    £464
    5
    29.26
    437
    423
    £124
    £588
    6
    30.14
    436
    421
    £127
    £715
    7
    31.05
    434
    419
    £130
    £845
    8
    31.98
    432
    418
    £134
    £979
    9
    32.94
    430
    416
    £137
    £1,116
    10
    33.92
    429
    414
    £141
    £1,256
    11
    34.94
    427
    413
    £144
    £1,401
    12
    35.99
    425
    411
    £148
    £1,549
    13
    37.07
    424
    409
    £152
    £1,700
    14
    38.18
    422
    408
    £156
    £1,856
    15
    39.33
    420
    406
    £160
    £2,016
    16
    40.51
    419
    405
    £164
    £2,180
    17
    41.72
    417
    403
    £168
    £2,348
    18
    42.97
    415
    401
    £172
    £2,520
    19
    44.26
    414
    400
    £177
    £2,697
    20
    45.59
    412
    398
    £182
    £2,879
  • System: 1 x Bolt 400W rigid solar panel (monocrystalline TOPCon), total 0.40 kWp. Microinverter: Hoymiles HMS-800-2WB (800 VA, 2 MPPT, 96.7% peak efficiency).

    Orientation: Modelled at 40-degree tilt, azimuth -6 degrees (near due south), the optimal configuration for London. A ground, wall or balcony frame allows this angle to be set. Output will be lower at other orientations.

    Specific yield: 1,122 kWh/kWp/year (PVGIS simulation for London at 40-degree tilt, azimuth -6 degrees, less a 3% allowance for soiling and real-world inverter efficiency).

    Year 1 generation: 445 kWh.

    Panel degradation: 1% in year 1, 0.4%/year thereafter (standard N-type TOPCon performance warranty).

    Seasonal generation split: Winter 33% / Summer 67% (derived from PVGIS monthly output at 40-degree tilt for London).

    Self-consumption rate: Winter 100% / Summer 95% (blended 97%). System output stays below household demand for almost all daylight hours, so nearly all generation is consumed on site.

    Annual consumption: 2,700 kWh (Ofgem typical medium household). Winter 60% / Summer 40%.

    Electricity tariff: 26 p/kWh (Ofgem price cap, July 2026), 3% annual inflation assumed.

    Export: No export income is included in this projection.

    Basis of calculation: Figures are modelled on a 400 W single-panel system.

    -

Actual returns may be higher or lower than projected depending on tariff changes and usage patterns. All figures are estimates based on the assumptions above
and should not be considered as guaranteed returns.

20-Year Financial Projection

Bolt 900W Solar Kit

System Size

0.93 kWp

2 x 465W

Year 1 Generation

1,013 kWh

London estimate

Year 1 Savings

£193

At 26p/kWh

Payback Period

~4 Years

July '26 prices

Bolt 900W.png
  • Year
    Elec rate (p/kWh)
    Generation (kWh)
    Self-use (kWh)
    Annual savings (£)
    Cumulative (£)
    1
    26.00
    1,013
    741
    £193
    £193
    2
    26.78
    1,009
    738
    £198
    £391
    3
    27.58
    1,005
    735
    £203
    £593
    4
    28.41
    1,001
    733
    £208
    £802
    5
    29.26
    997
    730
    £214
    £1,015
    6
    30.14
    993
    727
    £219
    £1,234
    7
    31.05
    989
    724
    £225
    £1,459
    8
    31.98
    985
    721
    £231
    £1,689
    9
    32.94
    981
    718
    £236
    £1,926
    10
    33.92
    977
    715
    £243
    £2,168
    11
    34.94
    973
    712
    £249
    £2,417
    12
    35.99
    969
    709
    £255
    £2,673
    13
    37.07
    965
    707
    £262
    £2,935
    14
    38.18
    961
    704
    £269
    £3,203
    15
    39.33
    958
    701
    £276
    £3,479
    16
    40.51
    954
    698
    £283
    £3,762
    17
    41.72
    950
    695
    £290
    £4,052
    18
    42.97
    946
    693
    £298
    £4,349
    19
    44.26
    942
    690
    £305
    £4,655
    20
    45.59
    939
    687
    £313
    £4,968
  • System: 2 x 465 W rigid solar panels (N-type monocrystalline TOPCon, dual glass), total 0.93 kWp. Microinverter: Hoymiles HMS-800-2WB (800 VA, 2 MPPT, 96.7% peak efficiency), one panel per MPPT input.

    Orientation: Modelled at 40-degree tilt, azimuth -6 degrees (near due south), the optimal configuration for London. A ground, wall or balcony frame allows this angle to be set. Output will be lower at other orientations.

    Specific yield: 1,100 kWh/kWp/year (PVGIS simulation for London at 40-degree tilt, azimuth -6 degrees, less a 3% allowance for soiling and real-world inverter efficiency, and a further 2% for microinverter clipping as 930 Wp of panels feed an 800 VA microinverter).

    Year 1 generation: 1,013 kWh.

    Panel degradation: 1% in year 1, 0.4%/year thereafter (standard N-type TOPCon performance warranty).

    Seasonal generation split: Winter 33% / Summer 67% (derived from PVGIS monthly output at 40-degree tilt for London).

    Self-consumption rate: Winter 100% / Summer 60% (blended 73%). Midday summer output exceeds typical household base load, so a share of generation cannot be used on site.

    Annual consumption: 2,700 kWh (Ofgem typical medium household). Winter 60% / Summer 40%.

    Electricity tariff: 26 p/kWh (Ofgem price cap, July 2026), 3% annual inflation assumed.

    Export: No export income is included in this projection.

    Basis of calculation: Figures are modelled on a 930 W (2 x 465 W) system.

    -

Actual returns may be higher or lower than projected depending on tariff changes and usage patterns. All figures are estimates based on the assumptions above
and should not be considered as guaranteed returns.

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Typically around £0.26–£0.32 per kWh

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*Calculations are based on official solar radiation data from the European Commission's PVGIS database.

**Estimated production accounts for a 14% system loss and assumes a vertical panel angle (90° inclination).

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