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Free Solar and Battery Calculators: Price, Rebate, Battery Size, Blackout and EV, Northern Rivers
Checked and updated by our licensed electricians: October 2026
Free, honest solar and battery calculators built by a local Northern Rivers electrical contractor, not a sales company: a solar panel and battery calculator for what a system would cost after the rebate, a solar battery rebate calculator, a home battery size calculator (the quiz), a blackout runtime calculator, an EV charging calculator, and what homes in your postcode installed. Every result is an estimate with its assumptions shown; the exact design comes from your power bills and a site visit before install day.
The calculators and tools
Solar and battery price calculator
Our solar panel and battery calculator: tap your quarterly bill, roof, storeys and switchboard and see the system size and a price range after the federal battery rebate, Sigenergy and GoodWe, in about 30 seconds.
Solar battery rebate calculator
Pick a battery size and an install date and see the federal Cheaper Home Batteries rebate estimate, including what it steps down to on 1 January.
Blackout battery runtime calculator
How long would a battery run your fridge, lights, pump, air conditioner or the whole house when the power goes out, with and without sun.
Do I make enough solar to charge my EV? Calculator
How far you drive, when the car is home, your solar and bill: see how much of the car your roof can cover and what extra solar or a battery would close the gap.
Home battery size calculator: which battery is right for me? (60-second quiz)
Six quick taps: your likely battery size in real module steps, Sigenergy or GoodWe, and whether you would need more solar. No details needed to see the result.
What homes in your postcode installed
Pick your postcode and see the solar sizes and batteries our own electricians installed nearby, from 124 completed Northern Rivers jobs. No names or addresses.
Our installs near you: map by town
A map of the Northern Rivers towns where we have installed solar and batteries, with home counts and real case studies for each.
How to choose a home battery installer: the checklist
The questions worth asking any installer, us included: licences and accreditation, who does the work, the site visit, the switchboard, warranties and what the quote should show.
How to read your power bill to size solar and a battery
Where the daily use, the feed-in and the tariff sit on a bill, and what they tell you about the system you need.
Solar and battery numbers by town
How many homes in each Northern Rivers town have solar and batteries, from the Clean Energy Regulator postcode data.
Northern Rivers home battery buyer’s guide
Everything before you buy: sizing from your bills, Sigenergy and GoodWe in 8 and 9 kWh modules, the rebate step-down dates, blackout backup, where the battery can go, the switchboard, how to compare quotes and real local installs. Nothing to download.
Is my solar battery-ready? Checker
Seven taps about your inverter, system size, phase, roof and switchboard: see whether a battery sits alongside your inverter or replaces it, whether your roof can fill it and what the switchboard needs. No details needed.
Solar battery quote comparison checklist
Tick off the 12 things every quote should show as you read each one, see how many it covers and know what to ask before you sign. Your ticks stay on your device.
EV buyer’s guide: which electric cars charge best from home solar
35 EVs sold in Australia in 2026 compared for home charging: battery, range, 7 vs 11 vs 22 kW on-board charging, V2L and V2G, which charger suits Sigenergy, GoodWe or Sungrow, and how much solar a day’s driving takes. Nothing to download.
Hot water heat pump buyer’s guide + sizing calculator
Four taps (household, what heats your water now, solar, battery) give you a tank size, the daily energy and how it fits inside your solar; the guide compares the brands sold in Australia on noise, refrigerant, warranty and climate rating, with the STCs and NSW discount as they stand in 2026.
Can my switchboard handle an induction cooktop? Checker + getting off gas guide
Seven taps (house age, what is in the board, phase, main switch, what you cook on, other big loads, solar) give you a first answer: ready, a dedicated circuit, a switchboard upgrade, or a main supply check. The guide covers induction circuits, RCBO upgrades, who may disconnect LPG or mains gas, heat pump hot water and how solar and a battery carry an all-electric home.
Amber Electric or a VPP? Fit checker + honest guide
Six taps (battery brand, solar, how you feel about a moving price, backup, internet, life support) tell you whether Amber with SmartShift, a fixed VPP or neither suits your home. The guide covers wholesale pricing, the Essential Energy tariff underneath, Sigenergy and GoodWe compatibility, the risks, the NSW VPP payment and every NSW VPP that takes our batteries.
Generator or home battery for blackouts? Outage calculator + honest comparison
Five taps (what to keep running, how long, your solar, who can run a generator, neighbours) give you the generator route in litres of petrol and refuels and the battery route in kWh, side by side. The guide compares fuel, noise, maintenance, switch-over, safety and the changeover-switch rules, with the 2022 flood and 2025 cyclone outage history.
Which tariff shape suits my home? Checker + smart meter and controlled load guide
Five taps (meter, solar and battery, when you use power, hot water, big evening loads) give you a steer between time-of-use, flat, the Solar Sharer Offer and a demand tariff, with the controlled-load move for your hot water. The guide covers the smart meter rollout and your rights, Essential Energy’s 2026-27 windows and the October 2026 controlled-load changes.
Tiny home, granny flat and off-grid solar sizer + guide
Six taps (dwelling, people, full time or weekends, loads, hot water, days of autonomy) give you a first answer: feed it from the house, a 15 A outlet, or a stand-alone system with a battery and solar size. The guide covers granny flat metering and the tenant billing rule, the caravan rules for tiny houses on wheels, off-grid sizing for winter and shade, lithium iron phosphate vs lead acid, council rules and the off-grid battery rebate.
New build solar and battery planner + BASIX guide for NSW
Six taps (people, hot water, cooking, air conditioning, EV or pool, phase) give you a solar size, a battery size and the list to hand your builder. The guide covers what the BASIX certificate needs, the Northern Rivers exception to the 7-star rule, how solar and a heat pump score, single vs three phase before the slab, and timing with the certifier and the rebates.
Air conditioning on solar and a battery: calculator + guide
Six taps (your unit, the season, hours a day, when it runs, solar, battery) give you the kWh a day and the daytime vs evening split, with what that asks of solar and a battery. The guide covers what splits and ducted systems really draw, reading the energy label, pre-cooling on solar, sizing, winter and blackouts. We do not sell air conditioners.
Running your pool on solar: calculator + guide
A few taps (pool size, pump, hours, heating and months, cover, solar) give you the kWh a day and the solar that carries it in the midday window. The guide covers pump timers and variable speed, solar pool heating vs a pool heat pump vs gas, heater sizing and input kW, the cover, where the battery fits and the BASIX and circuit points for a new pool. A pool company supplies the heater; we size the roof.
Rebates and finance
We build the federal Cheaper Home Batteries rebate and the solar STC rebate into every design and handle the paperwork; the battery rebate steps down on 1 January, set by the install date. Read who qualifies and how the battery rebate is claimed and how solar STCs work. Eligible NSW homeowners can also apply for the NSW 0% interest Home Energy Saver loan of up to $15,000: see the NSW 0% solar and battery loan (eligibility criteria apply, subject to lender approval).
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Questions we get asked
Is there a solar panel calculator here as well as a battery calculator?
Yes. The solar and battery price calculator sizes the solar and the battery together from your quarterly bill and roof, so it works as a solar panel calculator and a solar battery calculator in one. The battery quiz is the home battery size calculator, the rebate calculator is the solar battery rebate calculator, and the EV calculator works out the solar needed to charge your car. Every result is in real panel and module steps, never a made-up size.
Are these calculators free, and do I have to give my details?
All of them are free. The battery quiz, the postcode tool, the install map and the guides show everything with no details at all. Every calculator shows its result with no details at all. Under each result there is an optional box: add your first name, mobile and postcode and we text you the result with a link to the Northern Rivers Battery Buyer’s Guide, and offer a free 15-minute phone call if you want one. We never sell or share your details.
How accurate are the calculators?
They are honest estimates with the assumptions written on each page: current supplier pricing and the federal rebate formula for the price and rebate calculators, typical appliance draws and an average Northern Rivers solar day for the blackout calculator. The exact answer for your home comes after we have seen 1 or 2 of your power bills and visited your home before install day.
Do the tools cover my area?
They are built for the NSW Northern Rivers, postcodes 2471 to 2473 and 2477 to 2490: Tweed Heads and Kingscliff south to Evans Head, and west to Lismore. Anyone can use them, but we only install in that area.
What happens after I use a calculator?
If you left your details, Piper from our team texts you within minutes to offer the two earliest times for a short call with our head electrician, who goes through your power bills and the exact numbers. No pressure and no price talk by text: pricing is done properly on the call.
