Overview of the Energy Path
A domestic solar PV system is a chain of components, each with a specific role. Energy flows from panels (generating DC) through protection and conversion equipment to your home's AC circuits, with optional diversion to battery storage or the grid. Understanding this path helps you evaluate quotations, ask informed questions, and appreciate why system design matters more than any single product brand.
The exact configuration varies between installations. A system with battery storage adds components and wiring paths that a panels-only system does not need. An installation with microinverters differs from one with a central string inverter. The principles below apply broadly, but your property's design will be specific - subject to survey.
Step-by-Step: The Energy Route
Solar Panels (Roof Array)
Mounted on rails attached to the roof structure, panels capture sunlight and produce DC electricity. Output varies with irradiance, temperature and shading. See how solar energy works for the fundamentals.
DC Cabling and Roof Isolator
DC cables run from the array to the inverter location. A DC isolator on the roof (or near the array) allows safe disconnection for maintenance. All DC wiring must meet relevant electrical standards.
Inverter (DC to AC Conversion)
The inverter converts DC to AC, tracks maximum power point, and synchronises with the grid. It may be a string inverter, microinverter array, or hybrid unit if batteries are included.
AC Isolator and Generation Meter
An AC isolator allows the inverter output to be safely disconnected. A generation meter (or integrated monitoring) records how much electricity the system has produced over time.
Consumer Unit (Fuse Board)
The inverter connects to a dedicated circuit in your consumer unit. From here, solar-generated AC flows to whichever circuits are drawing power in the home - lighting, sockets, appliances and dedicated loads.
Home Appliances and Circuits
When you boil a kettle or run a washing machine, the electricity may come from solar, the grid, or a combination of both - depending on generation and demand at that moment. No manual switching is required.
Battery Storage (If Fitted)
Where a battery is installed, surplus DC (or AC, depending on topology) can be stored for later use. The battery discharges into the home when solar generation is low or demand is high.
Smart Meter and Grid Connection
A smart meter records import and export. When generation exceeds consumption and battery capacity, surplus energy may be exported to the grid. When generation is insufficient, the home imports from the grid as normal.
Visual System Diagram
Panel to Home Electricity Path
What Happens at Each Stage
Generation: Panels produce DC proportional to available sunlight. No sunlight means no generation. Generation cannot be "turned up" on demand - it is dictated by conditions on the roof.
Conversion: The inverter continuously adjusts to maximise usable output (MPPT) and produces clean AC matched to the grid. Inverter efficiency is typically 96-98%, meaning a small fraction of energy is lost as heat during conversion.
Distribution: AC flows to active circuits. Solar does not "prioritise" certain rooms - it reduces grid import across the whole home proportionally to available generation and total demand.
Storage and export: If a battery is present and not full, surplus may charge it. Once battery and demand are satisfied, remaining energy may export. The value of export depends on your tariff - not something this guide can guarantee.
Monitoring and Visibility
Most modern systems include a monitoring app or portal showing real-time and historical generation, consumption and (where applicable) battery state. This data helps you understand how the system performs on your property, but it should not be compared directly to generic estimates that ignore shading, orientation and usage patterns.
Important: The physical route described here must be designed and installed by qualified professionals for your specific property. Cable routes, consumer unit capacity, earthing arrangements and grid connection requirements all need proper assessment. A technical review is needed before installation decisions are made.
What a Technical Review Should Check
- Consumer unit capacity and whether it needs upgrading to accommodate a solar connection
- Cable routes between roof, inverter location and consumer unit, and any access constraints
- Earthing and bonding arrangements relevant to the specific installation
- Where the smart meter and any generation meter will sit within the existing metering setup
Understand Your Property's Solar Suitability
If you understand the basics and want your own property assessed, you can book a technical solar review. Suitability depends on the property, roof, shading, usage and tariff - subject to survey.
Book a Technical Solar Review