Do I Need a Switchboard Upgrade for Solar or an EV Charger?

Your switchboard is the central hub of your home's electrical system. Every circuit in your house — lighting, power points, air conditioning — connects back to it. When you add solar or an EV charger, those systems need their own dedicated connections at the board.

Solar Inverter Requirements

A solar inverter connects to your switchboard and feeds generated power back into your home's circuits (and, with the right metering, back to the grid). The inverter itself requires a dedicated circuit breaker at the switchboard, sized to match the inverter's output — typically a 20A or 32A breaker for a standard residential system.

Under AS/NZS 3000:2018 (the Wiring Rules), the inverter circuit must also be protected by an RCD (residual current device). If your switchboard doesn't have spare breaker slots or lacks RCD protection, those issues need resolving before the solar installer can legally complete the job.

EV Charger Requirements

A home EV charger — what's called an EVSE (Electric Vehicle Supply Equipment) — is one of the highest electrical loads a residential property carries. A standard Level 2 charger draws 32A on a dedicated circuit, which is roughly equivalent to running three large air conditioners simultaneously.

That circuit needs its own breaker and RCD protection at the switchboard. If your current board is already at capacity, or if the main feed to your home is undersized, you may need a capacity upgrade before the charger can be safely installed.

There's a lot of conflicting information circulating about what's actually required. Here are the questions we hear most often from Toowoomba homeowners.

"The solar company said my board is fine — do I still need to check?"

Solar installers assess whether your board can accept their inverter connection. They're not always assessing whether the rest of your board is compliant, whether your main earth conductor is undersized, or whether there's an asbestos backing board behind the panel. An independent electrician's assessment gives you the full picture.

"Can't the EV charger just plug into a normal power point?"

Some portable EV chargers do run from a standard 10A outlet, but they're painfully slow — we're talking 8–12 hours for a modest charge. A dedicated 32A hardwired circuit is the practical solution, and that requires a proper circuit installation at the switchboard. Trying to run a high-draw charger from an old, shared circuit is a genuine fire risk.

"Does adding solar automatically require a switchboard upgrade?"

Not automatically — but it does require a licensed electrician to inspect your board and confirm it can safely accommodate the inverter connection. In Queensland, under the Electrical Safety Act 2002, all electrical work must be performed by a licensed electrician, and a Certificate of Testing and Compliance must be issued after any new installation. If the board isn't up to standard, the electrician can't legally sign off on it.

"My board still works fine — why would I need to upgrade it?"

'Still working' isn't the same as 'safe' or 'capable of handling additional load'. An old ceramic fuse board that's been quietly doing its job for 40 years has no RCD protection and was sized for a fraction of today's electrical demand. Adding solar or an EV charger to that system isn't a tweak — it's a significant load increase on infrastructure that was never designed for it.

The best time to find out your switchboard needs upgrading is before you've signed a solar contract — not the week the installer arrives and discovers a ceramic fuse board behind the meter box door.

We assess switchboards across Toowoomba and the Darling Downs every week. A proper capacity and compliance check takes less than an hour, and it tells you exactly what you're working with before you spend money on solar panels or an EV charger.

Call 0494 584 614 to book an assessment, or ask us about combining a switchboard upgrade with your upcoming solar or EV installation. Bundling the work is almost always the most cost-effective option.