Your Solar Analysis

How would you like to fund this system?

PPA Configuration — rates sourced from your region & system size

PPA Contract Length

— p/kWh

PPA rate for your region & system size (auto-calculated)

System Overview

Roof Area

—

m²

Panels Fitted

—

× 450W

System Size

—

kWp

Year 1 Generation

—

kWh

30yr Generation

—

kWh

Financial Summary

Installation Cost

—

GBP total

30yr Savings

—

GBP

Return on Investment

—

% over 30 years

Payback Period

—

years

CO₂ Offset

—

tonnes (30yr)

Break-Even Analysis

Cumulative Savings

Initial Investment

Year-by-Year Savings — First 10 Years

Assumptions & Limitations

Maintenance costs NOT included. Typically £15–£20/kWp/year.

Roof/mount coverage: 80–90% of total area assumed usable depending on mount type, accounting for edge setbacks, obstructions, and inter-row spacing.

Self-consumption: 80% of generation is assumed consumed on-site, displacing grid electricity at the import rate.

Export upside: the remaining 20% exported at a nominal 5p/kWh (SEG rate) is shown separately above as additional upside only — excluded from savings as export rates are not guaranteed and vary by DNO and tariff.

Panel degradation: 2% per year (industry standard).

Electricity price inflation: 3% per year.

Panel spec: 450W, 2.27m × 1.13m (2.57m²). System efficiency: 85%.

Carbon factor: 0.196 kg CO₂/kWh (UK grid 2026).

Does not include costs for scaffolding, surveys such as structural and also any grid associated costs or upgrades.

Important Notice

This is a rough, hypothetical calculation based on very basic input information. For a more detailed design and accurate costings and savings please contact:

Martyn Sheridan

martynsheridan621@gmail.com · +44 (0) 787 2015769