Solar only, solar with a battery, or a battery later?

For most Warragul homes the choice comes down to how much power you use after dark. Solar on its own suits a household that is home during the day and can run the dishwasher, hot water and heating off the panels; a battery suits a household whose biggest load is in the evening, because Victorian feed-in rates are now set by each retailer and exports often earn little. If you are unsure, solar now with a battery ready hybrid inverter keeps the battery option open without paying for it today.

There are three realistic paths, and each has a different upfront cost, a different share of solar used at home, and a different deadline pressure from the shrinking federal battery discount. This page compares them so you can decide which questions to ask a provider.

How do the three options compare?

Question	Solar only	Solar and battery at install	Solar now, battery added later
Upfront spend	Lowest: a 6 kW system averages $5,810 to $6,730 per system	Highest: panels plus a battery such as $7,784 to $8,284 per system	Panels now, battery cost later
Solar used in the house	Only what you use while the sun is up	Daytime use plus what the battery stores for the evening	Same as solar only until the battery arrives
Value of surplus solar	Paid at your retailer’s feed-in rate	Most surplus goes into the battery first	Feed-in rate until the battery goes in
Power in a blackout	None, the inverter shuts down with the grid	Only if the system is designed and wired for backup	Only once a backup capable battery is added
Federal battery discount	Not used	Claimed at today’s certificate factor	Claimed at whatever factor applies when it goes in, likely lower
Inverter	Standard string inverter	Hybrid inverter running panels and battery	Hybrid now ($2,500 to $4,500 as an upgrade figure) or an AC coupled battery with its own inverter later
AusNet application	One application	One application covering both inverters	A second application when the battery is added
Rework risk	Low	Low	Higher if the first inverter cannot take a battery

The battery figures are national averages from the Solar Choice battery price index. The low end of each battery band is the battery alone on a home that already has a hybrid or battery ready system. The high end includes the extra inverter needed to AC couple the battery to an existing system. The full list of published ranges sits on the Warragul solar and battery cost guide.

Why does the feed-in tariff matter so much now?

Since 1 July 2025 the Essential Services Commission no longer sets a minimum feed-in tariff for Victoria. Retailers set their own rates, and the only floor is that a rate cannot be below zero. That changes the sums for solar only. Every kWh you export earns whatever your retailer chooses to pay, while every kWh you use at home saves you the full retail price you would otherwise buy it at.

A battery shifts surplus daytime solar into the evening, so more of it is worth the retail price instead of the feed-in rate. That is the main financial case for a battery. How strong it is depends on your retailer’s rates and how much surplus you have, which is why a provider should ask for your recent bills before sizing anything.

Is a battery worth it with the federal discount?

The federal battery discount takes roughly 30% off the upfront price of an eligible battery, and the Clean Energy Regulator administers it. Solar Choice says that when the discount began in mid 2025 it cut around 3 to 4 years off the payback of a typical battery. That is Solar Choice’s estimate across its market, not a promise for your house.

The discount is not fixed. The Clean Energy Regulator’s battery page publishes the certificate factor per kWh of usable capacity:

Installed	Certificate factor per kWh
May to December 2026	6.8 per kWh
January to June 2027	5.7 per kWh

So a battery installed in the first half of 2027 earns fewer certificates than the same battery installed before the end of 2026. Prices can move too, so a falling factor does not automatically mean a dearer battery, but waiting has a cost on the discount side. The detail of how the discount tapers for larger batteries is on the rebates guide.

Who should choose solar only?

Solar only still makes sense in some homes:

• someone is at home most weekdays and can run washing, dishwashing and hot water in the middle of the day
• the budget covers panels now but not a battery, and the household wants the daytime savings straight away
• an older home where a switchboard upgrade is already needed and the owner wants to spread the spend
• the roof is small, so there will be little surplus to store anyway

If you go solar only, ask for a hybrid or battery ready inverter quote alongside the standard string inverter quote, so you can see the price difference for keeping the option open.

Who should add a battery at the same time?

Installing together tends to suit:

• households out at work all day with heavy evening use for cooking, heating and lights
• homes that have moved off gas and now run heat pumps, induction cooktops or an electric hot water unit at night
• rural properties around Warragul where a pump, fridge or freezer matters during an outage, if backup is designed in (see battery backup power)
• owners who want one installation, one network application and one inspection

When does adding a battery later make sense?

A staged approach suits a household that expects its usage to change, for example an EV purchase or a baby on the way, and wants a year of real solar data before choosing a battery size. A careful provider will check whether the existing inverter can accept a battery directly. If it cannot, the later battery needs its own inverter, which is why the AC coupled figure at the top of each battery band is higher. Sizing a battery for your evening load and the eligibility rules for the discount are explained on the home battery installation page.

AusNet sizes connections on the combined inverter rating of solar and battery together, not on the panels. Adding a battery later therefore means a new application, and the export limit you get then depends on the network at that time. The rules are covered in the AusNet connection guide for Warragul.

What sizing mistakes should I avoid?

• Sizing a battery on a sunny summer day. Warragul is often cloudy in winter, so a battery that fills easily in February may sit half empty in July.
• Buying more battery than the panels can fill. A large battery on a small array rarely charges fully outside summer.
• Assuming any battery gives blackout power. Backup is a design choice with its own wiring, and the provider should state in writing which circuits stay on.
• Ignoring the inverter limit. The hybrid inverter’s rating can cap how fast the battery charges and discharges.
• Forgetting virtual power plant settings. If you join a VPP, the operator may draw the battery down, which can leave less charge for your own evening use.

To get a straight answer for your own home, you can ask a local provider to price both options and compare them on the same bill data.

Next step: send your usage so the comparison is real

The comparison only works with your numbers. In the enquiry, say which of the three options you are weighing, attach your last four quarterly bills or a smart meter export, note whether anyone is home during the day, list big evening loads (heat pump, EV, electric hot water), and say whether blackout backup matters. Then send a solar or solar and battery comparison enquiry and an independent local provider can quote each path for your house. How enquiries are handled is set out on the about page.

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