Home Energy Monitoring: Track Solar, Battery, and Grid Usage

Once your solar panels or home battery are installed, the real gains come from understanding how energy flows through your home — and acting on it. Home energy monitoring lets you see solar production, battery state of charge, grid imports, and exports in real time, helping you time appliance use to free solar power, catch underperformance early, and optimise your Smart Export Guarantee earnings. This guide explains your options from simplest to most powerful.

Why monitoring matters for solar and battery owners

Without monitoring, you are flying blind. A system generating 20% below its PVGIS estimate could cost you £150–£300 per year in missed savings before you notice on an annual bill review. With monitoring, that same underperformance would be visible within days — a graph dip that prompts a quick inspection rather than a multi-year loss.

Good monitoring also helps you self-consume more solar. If your monitoring app shows 2 kWh of surplus heading to the grid at 11am, that is the cue to run the dishwasher or washing machine now rather than at 9pm. The difference between exporting at 6p/kWh (SEG rate) and consuming in-house at the avoided-import rate of 24p/kWh is significant over a year. See our guide to smart meters and solar panels for how metering interacts with your SEG payments.

Level 1: Your inverter's built-in monitoring app

Every modern grid-connected inverter ships with a companion app or web portal — and for most households, this is enough. These apps log daily, monthly, and annual generation in kWh, show real-time output, and typically include export tracking if a CT clamp is fitted.

What you get from common brands:

• SolarEdge: the mySolarEdge app shows panel-level performance (with optimisers), self-consumption, feed-in, and battery state if an SolarEdge battery is fitted. Historical data is stored in the cloud and accessible from any device.
• Fox ESS / Solis: the Fox Cloud / SolisCloud apps show string-level data, inverter status, and battery metrics. Both offer a web portal for desktop use.
• Sungrow: iSolarCloud provides real-time generation, consumption (with CT clamp), and battery data in a clear mobile interface.
• Fronius: Solar.web offers detailed generation data, weather correlation, and a configurable alert system for fault conditions.

The main limitation: most inverter apps show generation clearly but consumption data requires an additional CT clamp on your main supply. Check whether your installation included one — without it, the self-consumption figure shown in the app is estimated, not metered.

For a deep dive on monitoring apps and what alerts to configure, see our full guide to solar panel monitoring in the UK.

Level 2: SMETS2 smart meter data

If you have a second-generation (SMETS2) smart meter, you have access to half-hourly import and export data — a legal requirement for the Smart Export Guarantee and useful for understanding your grid interaction. The In-Home Display (IHD) that came with your smart meter shows current import/export in near real time, though it typically refreshes every 30 seconds rather than instantly.

According to Smart Energy GB, around 34 million smart meters had been installed in Great Britain by early 2026. A SMETS2 meter communicates via the national Home Area Network (HAN) and the Data Communications Company (DCC). This opens up third-party monitoring options:

• Hildebrand Glow / Bright app: connect to your SMETS2 meter via DCC authorisation and view half-hourly import/export data, cost tracking, and carbon intensity. Free to use.
• Loop: similar DCC-linked app with bill analysis and tariff comparison features.
• n3rgy: API access to your SMETS2 data for developers and Home Assistant integrations.

Note: smart meter data alone shows grid import and export, but cannot distinguish whether exported energy came from solar, battery, or a vehicle-to-grid setup. You still need your inverter app to see the generation-side picture. The two together give a complete view.

Level 3: Dedicated home energy monitors

Clip-on energy monitors give you whole-home real-time visibility without relying on a smart meter or inverter integration. They work by fitting one or more CT clamp sensors around the cables in your consumer unit or meter tails, then reporting to a hub (Wi-Fi or Zigbee) that feeds an app.

UK-available options include:

• Emporia Vue Gen 2 (from around £75): supports up to 16 CT clamps, so you can monitor individual circuits (EV charger, heat pump, immersion heater) alongside whole-home solar and battery flows. Strong Home Assistant integration.
• Shelly EM (from around £35 per unit): compact DIN-rail or clip-on monitor with excellent local API access; popular with Home Assistant users for its reliability and sub-second update rate.
• GEO Trio II: consumer-friendly IHD replacement that also works as a standalone energy monitor without a smart meter. Less granular than the above options but simpler to set up.

Level 4: Home Assistant — the most powerful free option

Home Assistant is open-source home automation software that can aggregate data from your inverter, smart meter, EV charger, and individual circuit monitors into a single dashboard. Running on a Raspberry Pi or similar, it gives you:

• Real-time energy flow diagrams (generation → home → battery → EV → grid)
• Long-term statistical storage of every kWh, queryable and graphable
• Automations: turn on the dishwasher when solar surplus exceeds 1.5 kW; charge the EV only when solar export is positive
• Integration with 3,000+ devices including SolarEdge, Fronius, Solis, Sungrow, Tesla Powerwall, Ohme EV charger, Zappi, and SMETS2 smart meters via the Hildebrand integration

The learning curve is steeper than a consumer app, but the payback is real: one UK solar owner community study estimated that automation-driven self-consumption improvements added £200–£400 per year in effective savings for a 4 kWp + 10 kWh battery system. Our detailed guide to Home Assistant solar integration covers the full setup for UK installs.

What to monitor: a quick-start checklist

• Daily generation (kWh): compare against PVGIS benchmark for the month — flag anything more than 15% below expected in comparable weather.
• Self-consumption rate (%): the share of your solar that you used in-house. A well-optimised 4 kWp system with battery storage can achieve 70–80% self-consumption vs 30–40% without storage.
• Battery cycles: LFP batteries are typically warranted for 4,000–6,000 cycles; tracking daily cycles via your monitoring app confirms you are on track for the warranted lifetime.
• Export rate: if your SEG payment looks low relative to your generation, cross-check that your smart meter is correctly reporting half-hourly exports to your supplier.
• Fault alerts: enable push notifications in your inverter app so isolation faults or communication errors reach you within minutes rather than weeks.