Free Electrical Tools
Electrical Calculators
The same calculations our Level 2 electricians run every day — free to use for homeowners, builders, electricians, strata managers and commercial projects across Sydney.
Why Is My Power Out? Troubleshooter
Power out right now? Answer a few quick questions to find out whether it's a network outage, a Level 2 fault on your property, or a tripping safety switch — and who to call.
Open calculatorMaximum Demand Calculator
Work out the maximum electrical demand for a house, granny flat, commercial or industrial property using AS/NZS 3000 Appendix C demand factors — and see what supply size it needs.
Open calculatorVoltage Drop Calculator
Check any cable run against the 5% voltage drop limit — consumer mains, sub-mains to granny flats and sheds, EV charger circuits and long commercial runs.
Open calculatorEV Charger Readiness Checker
Can your house handle a 7kW, 11kW or 22kW home charger? Check your supply before you buy — and see whether load management or an upgrade is the answer.
Open calculatorGranny Flat Power Estimator
Estimate the extra demand a granny flat adds and whether your existing supply carries it — plus sub-mains and separate metering pointers.
Open calculatorOven & Induction Power Checker
Switching from gas or upgrading the kitchen? Check your supply and switchboard can handle a new electric oven or induction cooktop.
Open calculatorAir Conditioner Power Checker
Split system or ducted — see if your home can run it, or whether it means a supply or switchboard upgrade first.
Open calculatorSolar & Battery Savings Estimator
Enter your quarterly bill, roof orientation and system size for a rough annual savings range — and see how much difference a battery makes.
Open calculatorSwitchboard Upgrade Quiz
No jargon, no numbers — tick the signs you see at home (ceramic fuses, no safety switches, flickering lights) and get a straight answer on whether your board needs upgrading.
Open calculatorWiring Age Checker
Own an older home? Answer a few questions about when it was built, what's on the switchboard and the symptoms you've noticed — and see whether your wiring deserves a professional inspection.
Open calculatorStrata Switchboard Upgrade Checker
For strata managers and committees — tick the signs in your building (ceramic fuses in the main board, defect notices, EV charging demand) and get a straight answer on whether the main switchboard needs upgrading.
Open calculatorSafety Switch Coverage Checker
Do all your circuits have safety switch (RCD) protection that cuts shock risk — or just some? Tick what's on your board and see where the gaps are.
Open calculatorPool & Spa Power Checker
Planning a pool, spa or heat pump? Check whether your home's supply can carry the pumps, chlorinator and heating before the equipment is ordered.
Open calculatorAppliance Running Cost Calculator
See what any appliance — air con, dryer, pool pump, EV charger — actually adds to your bill per week, quarter and year at your electricity rate.
Open calculatorHot Water Running Cost Comparison
Compare what your hot water costs per year on full rate, off-peak (controlled load) and a heat pump — and see if a switch is worth it.
Open calculatorRental Property Electrical Checklist
For landlords and property managers — run through the electrical basics of a rental (safety switches, smoke alarms, board condition) and see what needs attention.
Open calculatorHome Electrification Planner
Going all-electric? Add up induction, heat pump hot water, reverse-cycle and EV charging — and see whether your supply and switchboard are ready, and what to do first.
Open calculatorNeed it certified?
Calculators give you a guide — network applications, CT metering and supply upgrades need a documented assessment by a licensed electrician. Sydney Power Group handles the assessment and the upgrade, end to end.