How to Set Up Solar, a Battery and an EV Charger Together in Australia

A 10 kW solar system, a 13 kWh battery and a 7 kW EV charger can work together to virtually eliminate your electricity bill and fuel costs. The catch: these three systems fight over the same solar surplus unless you configure them properly. Get the priority settings wrong and your battery drains into the car, your EV charges from the grid at peak rates, or your solar exports for 5 cents when it could be saving you 35 cents.

This guide covers how to set up all three as one coordinated solar battery ev charger setup in Australia, what hardware options exist in 2026, and how to size and configure the system so each component gets what it needs.

Why the three systems need to talk to each other

Solar panels generate power. The battery stores it for the evening. The EV charger consumes it. Without coordination, the charger sees your battery as a power source and drains it like any other appliance in the house. Most battery management systems treat EV charging as household load by default.

Here is what happens without proper configuration: you come home at 5 pm, plug in your EV, and the home battery (which charged from solar during the day) dumps its entire stored energy into your car. By 7 pm, the battery is flat, and you are buying electricity at peak rates for cooking, heating and lights.

The fix is a clear priority hierarchy programmed into your system:

1. Essential home loads (always supplied first)
2. Home battery charges to target state of charge (80% by 2 pm is a good rule)
3. EV charger draws from remaining solar surplus
4. Battery tops up to 100% from any leftover
5. Grid export (last resort at 3 to 8 c/kWh feed-in tariff)

Integrated systems from Sigenergy handle this automatically. Mix-and-match setups need manual configuration through your inverter app, charger eco modes, or third-party tools like ChargeHQ.

All-in-one vs mix-and-match: which approach suits you

Two valid paths exist. Each trades off cost against simplicity.

All-in-one: Sigenergy SigenStor

Sigenergy’s vertically stackable tower integrates a hybrid inverter, battery modules, backup gateway, and an optional 25 kW bidirectional DC EV charger in one unit. A single controller manages all energy flows with no configuration required from you.

The DC charger is CCS2, certified to AS/NZS 4777.2, and supports Vehicle-to-Home. Full specs are on the Sigenergy Australia product page. That means your EV battery can discharge back into the house during peak periods, effectively making your car an 80 kWh backup power source.

Installed pricing (after federal battery rebate, mid-2026):

Configuration	Approximate Cost
16 kWh battery + 25 kW DC EV charger + install	$17,000 to $20,000
16 kWh battery + DC EV charger + 10 kW solar	$22,000 to $28,000
8 kWh battery + DC EV charger (no solar)	$14,000 to $17,000

Source: Sigenergy AU installer pricing, mid-2026

Best for: Households wanting zero-config energy management, V2H capability, or a single warranty and support contact.

Mix-and-match: Fronius + BYD + Wattpilot

The most popular mix-and-match stack in Australia pairs a Fronius Gen24 Plus hybrid inverter with a BYD Battery-Box Premium HVM and a Fronius Wattpilot EV charger. All three communicate via the Fronius Solar API.

The Wattpilot has an Eco mode that only charges your EV when solar surplus is detected. It can start charging from as low as 1.38 kW on three-phase (automatic phase switching), making it effective even on partly cloudy days.

Installed pricing (after federal battery rebate, mid-2026):

Component	Cost
10 kW solar array (panels + Gen24 Plus inverter)	$8,000 to $11,000
BYD HVM 10.24 kWh battery	$7,500 to $9,000 after rebate
Fronius Wattpilot (device + install)	$2,100 to $3,000
Total	$18,000 to $23,000

Source: Whirlpool Forums installer quotes, Fronius AU pricing, 2025-26

Best for: Households who want best-in-class components, already have a Fronius inverter, or want the flexibility to swap out one component later without replacing the whole system.

Budget option: Sungrow or GoodWe stack

A Sungrow SH series hybrid inverter paired with a Sungrow SBR battery and any OCPP-compatible 7 kW charger (Ocular IQ from $740, or Tesla Wall Connector at $699) delivers the basics for $16,000 to $20,000 after rebates. You lose the tight integration of the Fronius or Sigenergy ecosystems but save $3,000 to $8,000.

Enphase IQ ecosystem

Enphase offers a fully AC-coupled approach: IQ microinverters, IQ Battery 5P modules, and the IQ EV Charger 2. The system uses AI-driven energy management (IQ Energy Management, launched March 2026) to coordinate all components.

The IQ EV Charger 2 starts charging from just 1.38 kW of surplus solar and includes dynamic load balancing. The trade-off is cost: Enphase batteries run $1,400 to $1,500 per kWh installed, roughly double the Sungrow or BYD equivalent. Total system cost lands at $25,000 to $32,000 for 10 kW solar, 10 kWh battery and the EV charger.

Best for: Households already running Enphase microinverters who want one app for everything, or those prioritising the 15-year battery warranty.

How to size your solar battery ev charger setup in Australia

Solar panel sizing

Household type	Recommended system size
Home only (no EV, no battery)	6.6 kW
Home + battery	6.6 to 8 kW
Home + battery + 1 EV	8 to 10 kW
Home + battery + 2 EVs	10 to 13 kW

The maths: an average Australian home uses about 15 kWh per day. One EV driven 14,000 km per year at 17 kWh/100 km adds 6.6 kWh per day. Combined, you need to generate roughly 22 kWh daily. In Sydney, each kilowatt of panels produces 3.5 to 4.5 kWh per day depending on season. A 10 kW system delivers 35 to 45 kWh on a clear day, leaving plenty of surplus for battery and EV.

Winter is the pinch point. That same 10 kW system produces only 25 kWh in June and July. After 15 kWh goes to the house, you have 10 kWh left for battery and EV combined. On overcast winter days, expect to draw some power from the grid.

Battery sizing

Your battery needs to cover the gap between when solar produces and when you consume. Most households draw heavily from 5 pm to 10 pm.

• 10 to 13 kWh covers a typical evening for a 3 to 4 person home
• 16 to 20 kWh covers evening use plus some morning consumption before solar kicks in
• 20 kWh or more makes sense for two-EV households or homes with high overnight consumption

Do not oversize the battery to charge the EV overnight. It is almost always cheaper to charge the EV from off-peak grid rates (15 to 22 c/kWh) than to cycle an additional $5,000 of battery capacity. The battery’s job is covering household loads during peak periods (28 to 43 c/kWh). Your EV charger’s job is absorbing solar surplus during the day. For help choosing battery capacity in isolation, see the home battery comparison page.

EV charger power rating

A 7 kW single-phase charger is sufficient for most households. It adds 40 to 50 km of range per hour and fully charges most EVs overnight in 8 to 10 hours. More importantly, 7 kW aligns well with typical solar surplus during midday on a clear day.

Going to 11 kW or 22 kW three-phase only makes sense if you regularly need rapid daytime top-ups and have a large enough solar system (13 kW or more) to feed it without drawing from the grid.

Preventing the EV from draining your battery

This is the most common mistake in combined systems. Four solutions, from simplest to most sophisticated:

1. Solar-only mode on the charger. The Fronius Wattpilot Eco mode, Zappi Eco+ mode, and Enphase solar priority mode all restrict EV charging to surplus solar only. The EV simply does not charge when there is no surplus. Simple but inflexible. On overcast days, you may get very little charge.

2. Time-based scheduling. Schedule EV charging for solar hours only (9 am to 3 pm) and set the battery to a minimum reserve of 20 to 30%. If your battery hits its reserve limit, the charger cannot draw from it because the battery management system protects the reserve.

3. ChargeHQ app. This Australian-made app ($7.99/month) connects to your solar inverter and EV via APIs. It has a “Consumption Excludes Charging” toggle that prevents the battery from seeing EV load. Works with Tesla, BYD, Hyundai, Kia, MG and most OCPP chargers.

4. Integrated energy management. Sigenergy’s single controller and Enphase IQ Energy Management both handle this automatically. They know the difference between a house load and an EV load because they control the charger directly. No configuration needed.

The Solar Sharer Offer changes the maths

From 1 July 2026, the Solar Sharer Offer gives households in NSW, South East Queensland and South Australia free grid electricity during peak solar hours: 11 am to 2 pm in NSW and QLD, 12 pm to 3 pm in SA. Victoria follows from 1 October 2026. You need a smart meter and must opt in with your retailer. No solar panels required.

The daily cap is 24 kWh of free grid power. Here is how that interacts with a solar battery ev charger setup:

If you have solar: Your panels generate during the same hours. The smart strategy is to export your solar for the feed-in tariff (3 to 8 c/kWh revenue) and charge both your battery and EV from free grid power. Or use solar for the battery and grid for the EV.

If you do not have solar: You can charge a 7 kW charger for three hours (21 kWh) for free. That covers 120 to 140 km of driving per day at zero cost. Only 3 kWh of the cap remains for the battery, so prioritise the EV during the free window and charge the battery from off-peak overnight.

Optimal daily pattern with all three systems:

• 11 am to 2 pm: EV charges from free grid, battery charges from solar (solar does not count against the 24 kWh cap)
• 2 pm to 5 pm: Any remaining solar surplus tops up the battery
• 5 pm to 10 pm: Battery powers the house during peak rates
• Overnight: EV gets a grid top-up at off-peak rates if needed

According to the Department of Climate Change, Energy, the Environment and Water, more than 415,000 residential batteries were added in Australia in the past year, contributing to the grid-scale solar surplus that makes this scheme possible. You can find the full eligibility details and participating retailers on the energy.gov.au Solar Sharer page.

What a complete system costs in 2026

System tier	Components	Total after rebates
Budget	Sungrow hybrid inverter + 10 kWh battery + Ocular IQ 7 kW charger + 10 kW solar	$16,000 to $20,000
Mid-range	Fronius Gen24 + BYD HVM 10 kWh + Wattpilot + 10 kW solar	$18,000 to $23,000
Premium integrated	Sigenergy 16 kWh + 25 kW DC charger + 10 kW solar	$22,000 to $28,000
Premium modular	Enphase microinverters + IQ Battery 10T + IQ EV Charger 2	$25,000 to $32,000

The federal Cheaper Home Batteries Program provides roughly $3,500 to $6,000 off the battery component (approximately 30% of the battery cost, applied as an upfront discount via STCs at point of sale). No application needed. From 1 May 2026, the rebate tiers: full rate for 0 to 14 kWh, 60% for 14 to 28 kWh, and 15% for 28 to 50 kWh.

According to the Clean Energy Regulator, 271,000 home batteries had been installed by June 2025, with 85,000 in the first half of 2025 alone (up 191% year-on-year).

Payback period for the full stack

A household spending $30 per week on grid electricity and $60 per week on petrol (combined $4,680/year) can realistically reduce that to $5 to $15 per week in grid charges with a properly configured system. Annual savings of $3,800 to $4,400 are achievable.

At a total system cost of $20,000 after rebates, payback lands at 4.5 to 5.3 years. The battery alone pays back in 5 to 10 years (according to the Clean Energy Council’s 2025 data). Adding solar and an EV charger shortens the combined payback because you are offsetting both electricity and fuel costs simultaneously.

These figures assume:

• Grid electricity at 35 c/kWh (national average is 39 c/kWh per GlobalPetrolPrices, June 2025)
• Off-peak charging at 18 c/kWh
• Petrol at $2.00/L for a car doing 9 L/100 km
• EV consuming 17 kWh/100 km
• 14,000 km driven annually

Frequently Asked Questions

Will my EV drain my home battery overnight?

Yes, unless you configure the system to prevent it. Most battery management systems treat the EV charger as a household load. Set your charger to solar-only mode during the day or schedule overnight EV charging from grid off-peak rates. Some integrated systems like Sigenergy manage this automatically.

How much solar do I need for a battery and an EV?

Most households need 8 to 10 kW of solar panels to cover home use plus one EV. A typical home uses 15 kWh per day and an EV adds roughly 6 to 7 kWh per day. In Sydney, a 10 kW system produces about 40 kWh in summer and 25 kWh in winter.

Should I get an all-in-one system or mix and match components?

All-in-one systems like Sigenergy cost more upfront but coordinate energy flows automatically with zero configuration headaches. Mix-and-match setups using Fronius plus BYD plus a separate charger cost less and let you choose best-in-class for each component, but require more careful setup.

Can I charge my EV for free with the Solar Sharer Offer?

Yes. From 1 July 2026, households in NSW, South East Queensland and South Australia with a smart meter get free grid electricity from 11 am to 2 pm (12 pm to 3 pm in SA). A 7 kW charger delivers about 21 kWh in three hours, enough for 120 to 140 km of driving.

What is the total cost for solar plus battery plus EV charger installed?

Expect $16,000 to $28,000 after rebates depending on the system you choose. A budget setup with Sungrow components runs $16,000 to $20,000. A Fronius plus BYD plus Wattpilot stack costs $18,000 to $23,000. Sigenergy all-in-one with V2H capability runs $22,000 to $28,000.