Mobius Labs 2

Overview

• Location: Hemel Hempstead, Hertfordshire

• Date of Installation: January 2025

• Type: Commercial

• Roof Layout: South-west

• Panel Count: 60

• System Size: 27 kWp

System Overview

The proposed solar PV system consisted of: 

• 60 x Trina Vertex 450W Monocrystalline

• Growatt MID 25 kW 3 phase hybrid inverter 

• 6 x 5 kWh Growatt APX HV 5.0P-B1 Batteries (30 kWh in total) 

Performance Estimates 

Annual Energy Generation  

The annual energy generation for this system is approximately: 23,000 kWh 

Consumption & Grid Export 

An energy consumption analysis was conducted based on an average household usage of 2,948 kWh per year. The expected distribution of generated electricity was approximately: 

• Self-consumed directly from solar: 7956 kWh (34%) 

• Stored and used via battery: 6282 kWh (27%) 

• Exported to the grid: 8618 kWh (37%) 

• Losses: 256 kWh (2%) 

Smart Export Guarantee (SEG) Eligibility

The installation qualified for SEG payments, allowing excess electricity exported to the grid to be sold back to an electricity supplier. More information on SEG eligibility and applications can be found at Ofgem.  

Environmental Impact  

The system contributed significantly to reducing the property’s carbon footprint: 

Annual CO₂ savings approximately: 4,800 kg C0₂ 

Equivalent to approximately: 

• 17,000 miles driven by a diesel car 

• CO₂ absorption of 220 trees annually 

Disclaimer: These calculations are based on estimated system output and standard carbon emission factors provided in the UK Government’s 'Greenhouse Gas Reporting: Conversion Factors 2024'. Actual results may vary due to differences in household energy use, weather conditions, and grid carbon intensity. 

Performance and Financial Projections 

Investment & Expected Savings 

The total cost of the installed system was £30,881 (including VAT at 20%). The estimated payback period is approximately: 6 years, with an estimated first year saving of approximately: £4,000.

Disclaimer: Payback periods are estimated based on current electricity prices and SEG rates. Future price changes, electricity consumption habits, and system performance may affect the actual payback timeline. 

Frequently Asked Questions 

How does the shading affect the system?

No shade 

What is the expected performance over time?

The Solar panel performance will reduce by approximately 0.04% per annum. The Solar panel output is guaranteed to be at 87.4% after 30 years 

Can excess electricity be sold back to the grid?

Yes 

Installation

The system was installed by a trained installation team certified by MCS, RECC, and NAPIT and completed within a short period with minimal disruption to the household. 

*the above illustration is based on a unit cost of electricity of 24.5p/kWh and a SEG rate of 15p/kWh