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Bolt 460W Plug-In Solar Kit

Price

£549.99

The Thunder Bolt 460W Plug-In Solar Kit is an ENA-compliant solar system designed for UK homes. It combines a high-efficiency 460W solar panel with a microinverter, UK AC connection cable and dedicated mounting system.

Officially listed on the ENA Connect Direct register as a compliant Plug-in Solar device under reference THUNE/21203/V1.

Connect through a standard UK household socket, monitor your solar generation from your phone, and expand to the separately ENA-listed Bolt 920W system later if you want more solar capacity.

Optional upgrades include a flat roof mounting upgrade and 10m AC cable.
Free UK delivery.

AC Cable
Flat Roof Mounting Upgrade

Quantity

Features

Officially ENA Compliant
Listed on the ENA Connect Direct register as a compliant Plug-in Solar device under reference THUNE/21203/V1. Bolt 460W is designed for the new UK plug-in solar framework introduced on 27 August 2026.

460W Solar Power
Start generating your own electricity with a high-efficiency 460W N-type TOPCon solar panel. With 23% module efficiency, Bolt delivers substantial solar generation from a single-panel system. A simple, space-efficient starting point for home plug-in solar.

Plug Into a UK Socket
No dedicated solar inverter or hard-wired solar connection is required for the solar-only kit. Bolt connects to a suitable standard UK household socket using the supplied AC cable.

Start With 460W. Expand to 920W.
Bolt 460W starts with one solar panel, but the included dual-input microinverter gives you room to expand. If you want more solar later, simply add a compatible second panel using the unused independent input.

Made for Gardens & Flat Spaces
A practical alternative to conventional rooftop solar. Position Bolt in a sunny garden, on a suitable flat roof, shed, outbuilding or rear extension roof and start generating without a large traditional solar installation.

Smart App Monitoring
Built-in Wi-Fi and Bluetooth make it easy to check solar production and system performance through the S-Miles Home app, either locally or remotely.

Built for Outdoor Use
The Bolt solar panel and supplied microinverter are both IP67 rated for outdoor use. The panel is tested to IEC 61215 and IEC 61730 standards and covered by TÜV certification.

Everything You Need in One Kit
No need to source separate panels, inverter or connection components. Bolt is supplied as a complete home plug-in solar kit, ready to position, connect and start generating.

Technical Specifications

Solar Panel

Rated Power: 460 Wp
Cell Technology: N-type i-TOPCon Monocrystalline
Module Efficiency: 23.0%
Maximum Power Voltage (Vmp): 45.4 V
Open Circuit Voltage (Voc): 53.8 V
Maximum Power Current (Imp): 10.14 A
Short Circuit Current (Isc): 10.81 A
Dimensions: 1762 × 1134 × 30 mm
Weight: 21 kg
Junction Box: IP68
Operating Temperature: -40°C to +85°C
Maximum System Voltage: 1500 V DC
Product Warranty: 25 years
Performance Warranty: 30 years

 

Microinverter

Model: Hoymiles HMS-800-2WB
Rated AC Output: 800 VA
MPPTs: 2 independent MPPTs
Inputs: 1 per MPPT
MPPT Range: 16-60 V
Maximum Input Voltage: 65 V
Peak Efficiency: 96.7%
Connectivity: 2.4 GHz Wi-Fi + Bluetooth
Monitoring: S-Miles Home
Protection Rating: IP67
Cooling: Natural convection, fanless
Dimensions: 261 × 180 × 35.1 mm
Weight: 3.2 kg

 

System & Compliance

System Type: Plug-in Solar
PV Capacity: 460 Wp
Maximum AC Output: 800 VA
ENA Status: Compliant
ENA Reference: THUNE/21203/V1
AC Connection: Manufacturer-supplied UK 3-pin connection cable
Mounting System: Thunder Bolt mounting bracket
Monitoring: S-Miles Home

What's in the Box

  • 1× Rigid solar panel
  • 1× Hoymiles HMS-800-2WB microinverter
  • 1× AC connection cable
  • 1× Thunder Bolt mounting bracket set
  • 2× DC extension cables
  • 2× Disconnect tools
  • 2× Protective MC4 caps
  • 1× Installation guide

 

Panels and kit accessories are delivered separately.

FAQs

Is the Thunder Bolt 460W ENA compliant?
Yes. Thunder Bolt 460W is officially listed as a compliant Plug-in Solar device on the Energy Networks Association Connect Direct register under reference THUNE/21203/V1.

Is plug-in solar legal in the UK?
Yes. From 27 August 2026, compliant plug-in solar systems can legally connect to suitable standard household sockets in Great Britain under the new UK plug-in solar framework. Bolt 460W is listed as a compliant Plug-in Solar device on the ENA Connect Direct register.

Is the Bolt 460W a good first solar system?
Yes. Bolt 460W is designed as a simple entry point into home plug-in solar. You start with one 460W panel and already have the infrastructure to expand with a compatible second panel later.

Can I add another solar panel later?
Yes. Bolt 460W uses one of the two independent inputs on the Hoymiles HMS-800-2WB microinverter. You can later add a second compatible 460W panel and upgrade to Thunder Bolt 920W, which is separately listed as an ENA-compliant Plug-in Solar system.

What happens to the unused solar input?
Protective MC4 caps are supplied for the unused microinverter connectors, keeping them covered until you decide to expand your system.

Does the Bolt 460W plug into a normal UK socket?
Yes. Bolt 460W is supplied with the required UK AC connection cable and is designed to connect to a suitable standard UK household socket. Extension leads, multi-way adaptors and travel adaptors must not be used.

Where can I install the Bolt 460W?
Bolt works particularly well in gardens and on suitable flat roofs, sheds, outbuildings and rear extension roofs. Wherever it is installed, the panel should be securely positioned and receive good sunlight with minimal shading.

How does the Bolt 460W work?
The solar panel generates DC electricity, which is converted into usable AC electricity by the microinverter. The system then connects to your home through its UK 3-pin plug, allowing the solar electricity to be used by appliances in your home.

Do I need an electrician to install it?
A hard-wired solar installation is not normally required for Bolt 460W. Plug-in solar is designed for consumer installation using a suitable household socket. However, if your consumer unit is old, your circuits are not clearly identifiable, or you are unsure about the condition of your electrical installation, you should have it checked by a qualified electrician before connecting the system.

Need help? Thunder can handle the notification for you

Can I monitor how much solar power I am generating?
Yes. The included smart microinverter has built-in Wi-Fi and Bluetooth and works with the S-Miles Home app, allowing you to view your solar production and system performance from your phone.

Do I still need to notify my DNO?
Yes. Plug-in solar remains grid-connected generation and your Distribution Network Operator must still be notified under the applicable G98 process. This is a notification rather than a traditional solar connection application. Thunder provides the information you need to complete the notification.

How large is the Bolt 460W solar panel?
The panel measures 1762 × 1134 × 30 mm and weighs approximately 21 kg, making Bolt a relatively compact single-panel solar setup.

Can I add battery storage later?
Yes. Battery storage can be added later, or you can choose Bolt Plus 460W if you want solar generation and storage together from the outset.

Downloads

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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