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Case Studies

Karan Butter’s Solar Installation

Karan Butter Two Tower Home Solar Panel Installation in London

Delivered ~33,500 kWh of Clean Power for 45% Landlord Supply Self-Sufficiency Across Two Towers

Karan Buttar, a London property owner, transformed two residential towers with the help of dual 15.23 kWp solar PV systems. Both projects help cut annual landlord supply costs by up to £6,600 and offset ~16,800 kg CO₂ each year.

£165K

Lifetime client savings

30.46 KW

System Size installed

420K Kg

Co2 Saved

Panels installed

CLIENT

Being a landlord in London can be a financial nightmare when it comes to energy bills. For Karan Butter, saving on energy bills and being eco-friendly was a double-edged sword. Like many landlords who are always looking into the future, he wanted to kill two birds with one stone by creating modern, energy-efficient homes for his tenants while also improving the long-term value of his investment. This led him to choose solar as a way forward, and we were delighted to help.

The Project

The vision was to simply replicate a high-performing solar solution across both Tower A (33 flats) and Tower B (31 flats). Each system was thoughtfully designed to maximise south-facing exposure and provide consistent solar generation year in and year out. By choosing a dual installation, Karan doubled the impact, which then helped secure reliable returns, demonstrating that large-scale residential buildings can play their part in reducing carbon emissions.

The technical scope included:

70 × Jinko 435W panels (30.46 kWp total capacity across both towers)
2 × Solis 15kW 3-Phase Inverters
Flat Roof Pitch: 10° (South Facing, both towers)
Project Cost: £28,800 combined (£14,400 per tower)

The Solution

Both towers were equipped with systems specially made for efficiency and long-term peace of mind. South-facing orientation and modern inverter technology mean strong yields, while 45% of landlord supply is now met directly through clean, solar energy. The dual setup also cushions both buildings against unpredictable and often stress-inducing UK electricity tariffs, making costs less of a hassle to manage in the long run. So, basically, solar helped Karran achieve reliable performance, environmental gains he can measure, and a smart property upgrade all rolled into one sustainability project..

The Result

Energy Performance

Annual Energy Generation (Combined): ~33,500 kWh
Specific Yield: ~1,100 kWh/kWp
Landlord Supply Offset: ~45%

Environmental Impact

Annual CO₂ Savings (Combined): ~16,800 kg
Lifetime Carbon Offset (25 years): ~420,000 kg
Equivalent to Planting: ~18,000 trees

Financial Impact

Lifetime Energy Savings: £150,000 – £165,000
Annual Bill Reduction (Combined): ~£6,000 – £6,600
Monthly Savings: ~£500 – £550
Weekly Savings: ~£120 – £130
Payback Period (ROI): 6 – 8 years

Client Benefits:

Two towers now proudly part of the energy-efficient home movement
Reliable south-facing design delivering consistent solar generation
Strong safeguard against rising UK electricity costs
~420 tonnes of CO₂ avoided over the system’s lifetime
Lifetime carbon savings equal to planting ~18,000 trees
A high-quality upgrade that delivers financial savings, sustainability, and increased property value

Financial Impact

Lifetime Energy Saving

£165,000

System Cost

£28,800

Estimated ROI

6 – 8 Years

Average Annual Savings

£6,600

Average Monthly Savings

£550

Average Weekly Savings

£130

Energy Production

Annual Energy Generation

33,500 kWh

Specific Yield

1,100 kWh / kWp

Self Sufficiency

45% Years

Environmental Impact

Lifetime Carbon Offset

420,000 kg CO2

Equivalent trees planted

18,000

Average Carbon offset Yearly

16,800 kg CO2

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PROPERTY & HOME

with MARTIN ROBERTS

British television presenter, property expert, author, investor and radio host best known for presenting the BBC property auction show Homes Under the Hammer.