A smart energy management system unifies the FHS technologies — solar PV, battery, heat pump, EV — under a single intelligent control layer. Properly implemented, it lifts self-consumption from ~55% to ~78% and adds £280/year of saved electricity to a typical 4 kWp + 13 kWh new build.
What makes a solar system truly "smart": integration vs monitoring
A solar system is only genuinely smart when it acts on data, not just displays it. Monitoring shows you what is happening — generation, battery charge, import and export — on an app. Integration goes further: the system automatically controls the battery, EV charger, heat pump and appliances in response to that data and to live tariff signals. Most systems sold as "smart" are monitoring-only. The truly smart ones close the loop and take action without you touching anything.
| Capability | Monitoring-only | Truly smart (integrated) |
|---|---|---|
| See generation & usage | ✓ | ✓ |
| Auto-charge battery on cheap tariff | ✗ | ✓ |
| Divert surplus PV to the EV | ✗ | ✓ |
| Pre-heat hot water / fabric on surplus | ✗ | ✓ |
| Defer appliances to sunny hours | ✗ | ✓ |
| Lifts self-consumption | ~55% | ~78% |
The practical test: if the system needs you to read the app and manually flip a switch to benefit, it is monitoring. If it makes those decisions for you — banking cheap-rate or surplus solar energy into the battery, the car, the hot-water cylinder and the heat pump automatically — it is integrated, and that automation is where the ~£280/year of extra self-consumption value comes from on a typical new build.
The three layers of smart energy
Three layers of smart energy intelligence matter on a UK new build:
- 1Monitoring. Real-time visibility of generation, consumption, battery state-of-charge and grid import/export through a single app or dashboard. Standard across all major inverter brands since 2018.
- 2Tariff optimisation. Battery charges during off-peak tariff windows (e.g. 30p Octopus Agile cheap-rate periods) and discharges during peak periods (70p+). Mainstream since 2022.
- 3Whole-home automation. Solar generation triggers decisions across heating, EV charging, hot water and discretionary loads. This is the 2025-26 capability that's newly mainstream — and the layer where the £280/year additional self-consumption value lives.
Three common platforms
| Platform | Best for | Hardware cost | Install cost |
|---|---|---|---|
| Loxone | Architect-led custom builds, premium homes | £1,400-£2,800 | £1,200-£3,200 |
| Home Assistant | Tech-confident self-builders, full local control | £200-£600 | £800-£1,800 |
| Hubitat | Z-Wave/Zigbee-heavy setups, mid-market | £300-£700 | £900-£2,000 |
For most volume-housebuilder schemes the manufacturer's native app is sufficient — Loxone/HA/Hubitat is a self-build or premium-plot upgrade rather than a standard fit.
First-fix wiring for smart energy
If you're planning a smart energy system on a new build, the wiring should be planned at first fix. These are cheap to install during build, expensive to retrofit:
- •Cat6 ethernet to the inverter location — for API reliability beyond WiFi
- •Modbus RS485 cable from inverter to the smart-home hub location
- •Spare 16A circuit for a controllable immersion heater
- •Ethernet runs to plant room equipment (ASHP, MVHR) where the manufacturer supports BMS-level integration
- •Smart-meter compatibility (most UK new-build smart meters now support consumer access devices for direct half-hourly data)
- •32A circuit to the EV charger location with provision for an isolator switch (future V2H/V2G readiness)
Five high-value automations
The automations most often specified on UK self-build FHS installations:
- EV solar diversion: Zappi or Ohme charger reads inverter generation and diverts surplus PV to the car. Best with a 7 kW charger and a daily-commute EV.
- Battery tariff optimisation: Battery charges from grid during 30p Octopus Agile cheap-rate windows, discharges during 70p+ peaks. £150-£300/yr saving.
- Hot water heat-up: Immersion heater triggered when battery is full and surplus PV is being exported. Free hot water for ~6 months/year.
- Appliance deferral: Dishwasher and washing machine wait for surplus PV. Miele and Bosch both support this through their APIs.
- Pre-heating: ASHP runs at higher setpoint when PV is generating, banking heat in the building fabric for the evening.
For the full technical guide see our solar + smart home integration article. To ask about a smart energy system for your new build, send us your site details and we reply by email.