If you can’t measure your demand, you end up guessing — and that’s where bad purchases happen. Monitoring is not about buying gadgets; it’s about getting credible answers.
Decide what question you’re trying to answer
Different decisions need different data. Examples:
- “Should I switch tariff?” → time-of-day usage matters (see Night Rate & Time-of-Use)
- “Is solar worth it?” → daytime usage and seasonal patterns matter (see Are Solar Panels Worth It?)
- “Do I need a battery?” → how much surplus you export matters (see Solar Batteries in Ireland)
Monitoring options (high level)
Smart meter / supplier data
If you have access to interval data, it’s often the simplest starting point for tariff decisions and baseline profiling.
Whole-home monitoring
A whole-home monitor can show total demand patterns, which helps identify:
- Baseline load
- Peaks and what causes them
- Overnight demand (useful for EV and heat pump planning)
Appliance-level monitoring
Plug-level monitoring can help with specific questions (e.g. a particular device’s run cycle), but it won’t capture hardwired circuits.
Common pitfalls
- Measuring the wrong time window (one unusual week isn’t a baseline)
- Assuming correlation equals cause (“my bill went up, so the new device must be at fault”)
- Missing big loads (hardwired circuits, EV charging, heating equipment)
- Changing multiple things at once (you lose the ability to attribute outcomes)
Common questions
How long should I monitor?
Long enough to see normal routines, and ideally enough variability to avoid one-off weeks. For solar decisions, seasonal patterns matter.
Do I need monitoring if I already have solar/EV apps?
Inverter and charger apps can be helpful, but they can also hide system-level interactions. A whole-home view can still be useful for debugging and optimisation.
Will monitoring guarantee savings?
No. Monitoring gives you clarity; savings depend on what actions you take and whether the actions fit your household constraints.
Related guides
- If the goal is tariff optimisation: Night Rate & Time-of-Use Electricity in Ireland.
- If the goal is PV decisions: Solar Panels in Ireland.
- If the goal is EV charging: Home EV Charger Installation in Ireland.
- Browse all Guides.
Disclaimer: This guide is informational only. Always follow equipment instructions and consult qualified professionals for electrical work. Tariff and programme details can change — verify with official sources.