How many EVs can your building already charge?

Most strata buildings have more spare power than they think. Adjust the figures below to see how many electric vehicles your existing supply could charge overnight — no switchboard upgrade, no rewiring.

Your building & cars

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Available supply

Spare capacity, amps per phase

A/phase

The spare electrical capacity in your building's main switchboard, measured in amps on each phase. Most Australian apartment buildings run on 3-phase power. Your strata manager or electrician can confirm the figure — or contact us for an assessment.

16 A400 A

Time parked

Average hours per day, available to charge

h/day

The hours each day a car is parked and available to charge — its charging window. The supply is shared and time-shared: a longer window lets the same building power top up more cars in turn, so more hours means more cars served. Apartment cars usually sit idle overnight and through the workday — around 19 hours is typical.

1 h24 h

Daily driving

Average distance driven per day

km/day

The distance a typical resident drives in a day. This sets how much energy each car needs to replace overnight. The Australian average is about 31 km per day — roughly 11,000 km a year.

5 km150 km

Car efficiency

Energy used per 100 km

kWh/100km

How much electricity an EV uses to travel 100 km. Smaller, efficient cars sit near 15 kWh/100km; larger SUVs and utes use closer to 20–22. We default to 18 kWh/100km as a mixed average.

1030

Figures are pre-filled with Australian averages.

Your supply could charge

up to 306

electric vehicles — 306 residents charging overnight, every night.

90kW

Available power

The total load your supply can deliver at once, across all three phases.

Each car needs5.6kWh/day

Supply delivers1,710kWh/day

Range per car11,315km/yr

Charge time / car2.3h/day

What the numbers mean

A plain-English guide

Available power

Your spare amps turned into kilowatts — the most your building can push out at any one moment. We assume standard 240 V supply across 3 phases.

amps × 240 V × 3 phases ÷ 1000

Supply delivers (per day)

Power available, multiplied by the hours cars are parked and able to charge. This is the total energy your building can hand out across a day.

available power × hours parked

Each car needs (per day)

The energy one EV uses to replace a normal day's driving. Drive further or own a thirstier car, and this goes up.

km per day ÷ 100 × efficiency

EVs your supply could charge

The headline figure: total energy your building delivers each day, divided by what one car needs. It shows how far your existing supply really stretches.

supply delivers ÷ each car needs

Please read

This is an indicative estimate

The figures here are a simplified guide based on standard assumptions — 240 V supply, 3-phase power, and load shared evenly across the day. Your building's real capacity depends on its switchboard, existing electrical loads, metering and safety compliance. Before making any decisions, please get a proper assessment of your building from our team.