Why smart devices are different from what your board was built for
A smart speaker, a Wi-Fi camera, a smart plug, a video doorbell, these all draw a few watts each, similar to a phone charger. Ten of them running constantly won't trouble a switchboard built in the 1990s. The confusion happens because people lump these in with the appliances that actually matter for capacity.
Boards built before the mid 2000s were sized for the household of that era: a fridge, a TV, some lights, maybe an air conditioner. They weren't sized with an EV charger, a home battery, an induction cooktop, and a home office full of monitors and a server rack in mind, all running at once in the same house.
The real load adders
An EV charger is the single biggest new load most Sydney homes are adding. A 7kW home charger installation typically runs $1,800 to $2,800 in 2026, and it needs its own dedicated circuit with its own RCD, not a shared point. If your board doesn't have a spare circuit position and available capacity, the charger install becomes a switchboard job first and a charger job second.
A home battery is similar. Battery systems in Sydney are commonly running $8,000 to $17,000 fully installed before rebates, and they need a compatible inverter and dedicated wiring, not just a spare power point. If you're adding a battery to an existing solar system, the switchboard and inverter compatibility get checked before anything else happens.
Induction cooktops, heat pump hot water systems, and multiple reverse cycle air conditioners all sit in the same category, high, continuous, or high-startup loads that need proper circuit allocation, not an extension lead and hope.
Signs your board is already at its limit
Lights dimming when the air conditioner or a high-draw appliance starts up is one of the clearest signs. So is a breaker that trips whenever two moderate loads run together, the oven and the kettle, for example. If you've added any of the big three, EV charger, battery, or induction cooktop, and started noticing either of these since, that's not a coincidence.
An older board with no spare circuit breaker positions is a physical limit, not just a performance issue. There's nowhere left to add a new dedicated circuit without a broader upgrade.
What future proofing actually looks like
It doesn't mean overbuilding for devices you don't have yet. It means, when you upgrade a switchboard for any reason, asking for spare circuit positions and enough main switch headroom to add an EV charger or a battery later without redoing the whole board again in three years. That's a conversation worth having at quote stage, not after the next big purchase.