📊Grid Independence
Grid Independence & Self-Consumption Calculator
Independence from retail utility rates
📍Location-calibrated simulation by town or outward postcode:
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Independence Matrix
Self-Consumption & Autonomy London
Energy-balance modeling: Calculate grid independence with local solar irradiance (986 kWh/kWp).
Grid Independence
56 % Solar System Capacity
4.5 kWp
1 kWp (Small / Garage)20 kWp (Full Roof)
Annual Electricity Load
kWh
Electricity Unit Rate Auto-Sync
p/kWh
Battery Capacity
6.5 kWh
2 kWh (Compact)20 kWh (Large Pack)
Currently calculating with: 25.4 p/kWh
📍London (986 kWh/kWp)
Annual Energy Balance
3,800 kWh loadSolar Direct & Battery:56 % (2,128 kWh)
Residual Grid Import:44 % (1,672 kWh)
Self-Consumption Ratio
4,437 kWh PV 48 %
2,128 kWh utilized on-site | 2,309 kWh exported to grid.
Avoided utility purchases:+ £542
SEG export revenue:+ £277
Total annual benefit:approx. £819 / yr
❓Frequently Asked Questions: Grid Independence
Key UK engineering benchmarks, Ofgem standards, and clean energy incentives at a glance:
What is the difference between solar self-consumption and grid autonomy?▼
Self-consumption is the percentage of on-site solar generation used within the house. Grid autonomy measures what fraction of total household demand is met without drawing imported electricity from your supplier.
How much does adding a battery increase grid independence in the UK?▼
Pairing rooftop solar with an appropriately sized battery raises annual grid independence to 65% to 80%, storing daytime surplus for high-demand evening domestic hours.
What is a solar power diverter (e.g. eddi or Solar iBoost)?▼
A solar diverter dynamically channels excess rooftop solar into your domestic hot water cylinder immersion heater rather than exporting it to the grid, converting free solar energy into stored hot water.
What grid autonomy is realistic in the UK without a battery?▼
A standard UK home without battery storage achieves approximately 25% to 35% grid autonomy, as daytime solar generation peaks while occupants are often away from home.
Why is 100% off-grid autonomy impractical in the British climate?▼
Due to shorter daylight hours and cloud cover, solar generation in December and January drops to around 10%–15% of summer peaks, requiring impractically large battery banks and oversized arrays to achieve true year-round off-grid living.
How does Home Energy Management (HEMS) optimise self-reliance?▼
A Home Energy Management System coordinates flexible appliances, heat pumps, batteries, and EV chargers to consume power when solar generation peaks or grid prices drop to their lowest.
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