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Storm Plus 710W Plug-In Solar Kit with Battery

Price

£1,699.99

4 × lightweight flexible panels with 1.92 kWh battery storage

Ideal for sunny walls, fences and larger outdoor spaces

Store solar energy for use later

Free setup video call

AC Cable
Battery Mounting Set
Installation

Quantity

Features

More Solar, More Ways to Use It: Four lightweight 178W TOPCon solar panels combine with the Hoymiles HiBattery 1920 AC to create a flexible 710W solar and battery system. Ideal for sun-facing walls, façades, fences, sheds, garden offices and larger balconies where conventional rigid panels may be difficult to install.

Built for Sun-Facing Surfaces: With four flexible panels, Storm Plus 710W makes better use of larger south, south-east or south-west facing areas around your home. Each panel weighs just 3.5 kg, giving you substantial solar coverage without the weight of conventional rigid panels.

1.92 kWh Smart Energy Storage: Store available solar energy during the day and use it later when your household needs it. HiBattery supports self-consumption and time-of-use modes, helping you make more effective use of both solar generation and lower-cost electricity tariffs.

Intelligent Energy Management: The AC-coupled HiBattery delivers up to 96.5% bidirectional efficiency and 87% round-trip efficiency, while its LiFePO₄ cells are rated for 6,000+ cycles. Smart charging and discharging give you greater control over when your stored energy is used.

Smart Monitoring from Your Phone: Built-in Wi-Fi and Bluetooth connect the system to the S-Miles Home app, letting you monitor solar generation, battery status and energy settings from your phone.

Compact, Quiet and Outdoor Ready: Storm's TÜV-certified flexible panels offer IP67 protection, while the HiBattery provides IP66 protection, natural fanless cooling and operating noise below 17 dB(A).

Straightforward Installation: Mount the lightweight panels, connect them to the Hoymiles microinverter and position the HiBattery in a suitable location. Thunder provides a free one-to-one setup video call, with professional support available for the final AC connection.

Bundle and Save: Storm Plus 710W combines the complete Storm 710W solar system with 1.92 kWh of Hoymiles battery storage, saving £50 compared with purchasing the products separately.

What's in the Box

  • 4× Solar panels
  • 1× 1.92 kWh  Battery (LiFePO₄)
  • 1× Hoymiles HMS-800WB-2T microinverter
  • 1× AC connection cable
  • 2× Y-branch DC connection cable
  • 1× Double pole isolator
  • 2× Disconnect tools
  • 32× Elastic straps
  • 1× Set of solar warning labels
  • 1× Installation guide
     

Panels, battery, and kit accessories are delivered in separate boxes.

Battery 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 the Storm Plus 710W?
Storm Plus 710W combines four lightweight flexible solar panels, a Hoymiles microinverter and the 1.92 kWh HiBattery 1920 AC. It is designed for homes wanting greater solar generation together with smart energy storage.

What is the difference between Storm Plus 360W and Storm Plus 710W?
Both include the same 1.92 kWh HiBattery. Storm Plus 360W uses two solar panels and is particularly suited to balconies and smaller spaces. Storm Plus 710W uses four panels, making it better suited to larger sunny walls, façades, fences and outdoor areas with greater solar generation potential.

How much energy can the battery store?
The Hoymiles HiBattery provides 1.92 kWh of LiFePO₄ battery capacity and is rated for at least 6,000 charge cycles.

What happens to solar energy I don't use immediately?
Available energy can be stored in the battery for later use, helping you increase self-consumption rather than relying only on solar while the panels are actively generating.

Can the battery charge from the grid?
Yes. HiBattery supports time-of-use operation, allowing you to charge during lower-cost tariff periods and use stored electricity when grid prices are higher.

Where can I install the solar panels?
The four lightweight panels are particularly suited to sun-facing walls, façades, fences, sheds, garden offices and larger balconies. South-facing locations generally offer the strongest annual solar exposure, although south-east and south-west orientations can also perform well.

Can I monitor the system from my phone?
Yes. The S-Miles Home app works with the system's built-in Wi-Fi and Bluetooth, giving you access to solar production, battery status and energy management settings.

Does the battery require an electrician?
The flexible solar panels and microinverter are straightforward to assemble, while the complete battery system uses a professional final AC connection. Thunder can also help arrange installation support.

Can I expand the battery capacity later?
Yes. A second HiBattery 1920 AC can be added to increase total storage capacity to 3.84 kWh with the appropriate configuration.

Is the system suitable for outdoor use?
The Storm panels are IP67 rated and the HiBattery enclosure is IP66 rated. The battery should still be positioned according to Hoymiles installation guidance, including protection from direct sunlight and rainfall.

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

Energy production

  

kWh / year

Potential savings

  

£ / year

*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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