Most people want a straight answer on price. There’s also the issue of why battery quotes look so different, even when they list the same product.
We see this every day at PSC Energy. One quote might seem cheap, while another looks expensive. It can feel like hidden costs are involved, making it hard to compare.
At PSC Energy, we aim to make getting quotes easy. Battery prices can change a lot depending on site work, extra hardware, and if you want help during blackouts. With the Enphase IQ Battery 5P FlexPhase, many homes need more than one 5 kWh unit to meet their storage needs.
In this article, you’ll learn about the following:
- What Is the Enphase IQ Battery 5P FlexPhase? A Quick Refresher
- What Are the Costs in an Enphase FlexPhase Quote?
- How Many Enphase IQ Battery 5P FlexPhase Do I Need?
- PSC Energy Installed Price Ranges for FlexPhase In NSW
- Three Different Installation Scenarios and How They Change the Price of a FlexPhase Battery
- Single-Phase vs Three-phase Cost Drivers In NSW
- Rebates and Incentives That Affect Enphase IQ Battery 5P FlexPhase Budget
- Backup vs. Self-consumption: How Each Affects the Price
- A Simple Budgeting Checklist for NSW Homeowners
- FAQ: FlexPhase Cost
By the end of this guide, you’ll know the usual costs for FlexPhase, what drives the price, and how to compare quotes without any surprises.
What Is the Enphase IQ Battery 5P FlexPhase? A Quick Refresher
The Enphase IQ Battery 5P FlexPhase is a 5 kWh battery with built-in microinverters. Many homeowners choose Enphase for their reliable systems and strong warranty support.
FlexPhase is important because earlier versions of this battery were single-phase only. Each unit could be used in both single-phase and three-phase homes, but they couldn’t provide three-phase backup.
The new FlexPhase battery now provides real three-phase backup.
If you’re interested in learning a bit more about IQ Batteries, you might want to check out the following article titled, Enphase IQ Battery 5P FlexPhase Review.
What Are the Costs in an Enphase FlexPhase Quote?
Many people think the quoted price is just for the battery, but a full FlexPhase system quote includes more than just the battery itself.
1) Battery hardware
This is the battery unit itself.
Online prices for just the battery usually range from the mid-$5,000s to the low-$6,000s for one 5P unit. These prices don’t include installation, backup hardware, or switchboard work.
A battery-only price may appear attractive, but it doesn’t show the full cost of a complete system.
2) Control and backup hardware
Enphase systems commonly include additional equipment to manage monitoring and backup.
Many homeowners don’t realize how much space the extra control gear can take up. It can look bulky, add to the cost, and affect how neat the completed installation appears.
3) Installation labour
Labour covers mounting, cabling, protection, commissioning, and testing.
Labour costs go up if cable runs are longer, access is difficult, wall space is tight, or the switchboard work is more complex. Three-phase homes can also cost more because they need extra planning and wiring.
4) Switchboard and electrical upgrades
Some homes need extra switchboard space, new breakers, upgraded protection devices, or a full tidy-up.
This work often causes the biggest price differences between quotes. It’s important for system safety and regulation, so it’s not an area to cut corners.
5) Mounting and site work
Both wall mounting and floor mounting can look tidy, but floor mounting needs an extra kit.
Site issues can increase costs. If the wall is hard to work with, access is poor, or the location gets direct sunlight, extra labour and materials may be needed.
If you’re interested in solar batteries, you might want to check out the following article titled, Are Solar Batteries Worth It in NSW? PSC’s Ultimate Guide for 2026.
How Many Enphase IQ Battery 5P FlexPhase Do I Need?
A 5 kWh unit works for some homes, but most people want more storage.
- One battery often suits light usage and essentials-only planning.
- Two batteries often suit a more typical household goal.
- Three batteries often suit higher night usage or longer backup targets.
The average installed cost for a 10 kWh Enphase FlexPhase, including the system controller and installation, is $14,650. This benchmark can help with NSW budgeting, but every home is different.
On average, Enphase batteries cost $1,465 per usable kWh installed. This means a 5 kWh system might cost about $7,325 before rebates or extra upgrades.
This price can change quickly if you need switchboard upgrades or backup equipment.
If you’re interested in learning a bit more about the price of solar batteries, you might want to check out the following article titled, How Much Are Solar Batteries? A Full Breakdown of Prices, Rebates, and Value in 2026.
PSC Energy Installed Price Ranges for FlexPhase In NSW
These ranges assume a standard metro or regional NSW job with normal access. Every home can land outside these estimates.
1 x Enphase IQ Battery 5P FlexPhase (5 kWh)
This setup is good for basic night use or a smaller backup plan for essentials only.
- Typical installed system budget in NSW: about $8,500 to $12,500.
PSC Energy starts this battery system and installation for $10,932.
2 x Enphase IQ Battery 5P FlexPhase (10 kWh)
This setup fits the needs of most households.
- Typical installed system budget in NSW: about $13,500 to $18,500.
PSC Energy starts this battery setup at $14,059.
3 x Enphase IQ Battery 5P FlexPhase (15 kWh)
This option is better for higher night-time use, bigger homes, or longer backup needs.
- Typical installed system budget in NSW: about $19,500 to $27,500.
PSC Energy starts at $17,556.
There’s a wide range in prices because each extra battery adds more hardware, mounting, and cabling. As the system grows, some homes also need switchboard upgrades.
If you’re interested in looking at some solar battery choices, you might want to check out the following article titled, Which Solar Battery Should I Buy?
Three Different Installation Scenarios and How They Change the Price of a FlexPhase Battery
Here are three common installation scenarios and how they usually change costs.
Scenario 1: Existing solar now, battery added later
This option often ends up costing more than people expect.
- The project is done as a separate job instead of being bundled with other work.
- Extra monitoring or control equipment may be needed to integrate the battery.
- Retrofit switchboard work often increases the final price.
- Existing routes can require longer or more difficult cable runs.
Scenario 2: New solar and battery installed together
This approach usually gives better value and a neater setup.
- Planning the project together cuts down on repeated labour and compliance steps.
- The installer can design cable routes and equipment layout from day one.
- The system usually looks tidier when it’s planned and installed all at once.
Scenario 3: Existing Enphase solar now, battery added later
This setup can work well, but you still need to budget for Enphase-specific requirements.
- Integration is usually smoother if you stay within the Enphase system.
- Control gear and monitoring changes can still apply, depending on the existing setup.
- Planning for space is important because the equipment wall can get bigger.
If you’d like to learn a bit more about what solar batteries are on the market, you might want to check out the following article titled, 6 Best Solar Batteries on the Market.
Single-Phase vs Three-phase Cost Drivers In NSW
FlexPhase works with both single-phase and three-phase homes, but costs still depend on how complex the site is.
What increases cost on three-phase homes?
- More planning time around load split and backup coverage.
- More wiring work at the switchboard.
- Extra work if circuits need rebalancing to improve backup performance.
What keeps costs lower on three-phase homes?
- Good switchboard space and tidy existing wiring.
- Short cable runs.
- Easy access to the installation location.
- A simple essentials-focused backup plan.
Installers set up the battery according to your home’s phase setup, which affects labour and sometimes the parts needed.
If you’re interested in learning a bit more about installing a single-phase battery on a three-phase site, you might want to check out the following article titled, Can I Install a Single-Phase Battery on a Three-Phase Home?
Rebates and Incentives That Affect Enphase IQ Battery 5P FlexPhase Budget
NSW no longer has its old battery installation discount. Now, households are directed to the Australian Government’s Cheaper Home Batteries Program.
This program gives an upfront discount, but the amount goes down over time until 2030.
There are two main rules to keep in mind for budgeting.
The program supports batteries installed with solar.
The eligibility rules require the battery to be installed with an existing solar system or installed with a new solar system, provided the solar system meets the SRES size rules.
A first-claim rule can affect your plans if you want to add more batteries later.
The Clean Energy Regulator notes that additional solar batteries are not eligible for STCs after the first claim at the premises. This can matter for homeowners who plan to add more batteries later, which is common with 5 kWh modules.
If you’re interested in learning more about sizing solar batteries, you might want to check out the following article titled, What Size Solar Battery Do You Need?
Backup vs. Self-consumption: How Each Affects the Price
Self-consumption aims to store solar energy generated during the day for evening use.
Backup aims to power selected circuits during an outage.
Backup usually costs more because it needs extra control hardware, more switchboard work, and additional commissioning and testing.
Adding backup means more equipment, which can make the installation less streamlined.
A Simple Budgeting Checklist for NSW Homeowners
This quick checklist helps you avoid comparing quotes that aren’t really alike.
- Confirm night usage and the biggest household loads.
- Confirm single-phase or three-phase supply.
- Decide between bill savings only and/or outage backup goals.
- Confirm battery location and distance to the switchboard.
- Confirm switchboard upgrades are included if required.
- Find out how the Cheaper Home Batteries Program applies.
- Consider how staged expansion interacts with first-claim STC rules.
If you’re interested in learning a bit more about expanding your energy system, you might want to check out the following article titled, Expanding Your Solar Panel System with Batteries and Add-Ons.
Final Thought: FlexPhase pricing has range. Just like the backup.
A solid budget looks at the whole system cost, not just the battery price.
Details like your switchboard condition, cable run length, phase setup, and backup needs all affect the final price.
If a quote seems unusually cheap, it may be missing some costs that show up later. If it seems high, it might include board work and backup gear that other quotes don’t mention.
PSC Energy can review a quote and point out what looks missing or unclear. That simple check often saves time and avoids costly surprises. It’s what we do.
If you’re interested in learning a bit more about the changes to the Cheaper Home Batteries Program, you might want to check out the following article titled, Changes to the Australian Government’s Cheaper Home Batteries Program Explained.
FAQ: FlexPhase Cost
How much does the Enphase IQ Battery 5P FlexPhase cost installed in NSW?
Most installed quotes in NSW land in broad ranges because each home needs different electrical work. A single 5 kWh unit often lands in the high single digits to low teens installed. Two units often land in the mid-teens installed. Three units often land in the low twenties and up installed.
Why do “battery only” prices look much cheaper than installed quotes?
Battery-only pricing usually covers the battery hardware only. It does not include installation labour, switchboard work, cabling, protection devices, or backup control gear. A battery-only figure can help compare hardware, but it does not represent a finished system cost.
What items should a complete Enphase FlexPhase quote include?
A complete quote usually includes the battery units, mounting hardware, cabling, isolation and protection devices, commissioning, and monitoring setup. A backup-ready quote usually includes the required Enphase control equipment and the switchboard work needed to isolate circuits during an outage. Good quotes also list any expected switchboard upgrades and site allowances.
What makes an Enphase FlexPhase quote go up the fastest?
The biggest drivers usually include the number of batteries, switchboard upgrades, and backup hardware. Long cable runs also add cost. Three-phase sites can add cost when the electrician needs extra time for wiring and load planning.
Does three-phase power increase the installation cost in NSW?
Three-phase homes can increase cost because the electrician often needs more wiring time. The installer may also rebalance circuits for better backup outcomes. FlexPhase helps because it supports three-phase installs with the same battery model, but the site still drives labour and switchboard scope.
Does backup power cost more than self-consumption only?
Backup scope usually costs more. Backup often needs extra control hardware and extra switchboard work. Backup also needs more commissioning and testing time. Self-consumption-only systems usually keep the build simpler.
How does adding a battery to existing solar change the price?
A battery add-on can cost more than people expect because the job runs as a separate project. Retrofit work often needs more switchboard changes and more careful cable routing. The installer may also need additional monitoring or control gear to integrate the battery cleanly.
How does installing solar and the battery together change the price?
A combined build often improves value because the installer designs everything as one system. The job can reduce duplicated labour and duplicated compliance steps. The installer can also choose better cable routes and a cleaner equipment layout from the start.
How does adding the FlexPhase battery to an existing Enphase microinverter system change the price?
An existing Enphase system can integrate well with an Enphase battery, but the quote still needs to cover the Enphase control and monitoring requirements. Some older Enphase monitoring setups may need changes to support the battery system. This can add hardware and labour, so the quote can rise compared with a non-Enphase retrofit.
What hidden costs most often cause large quote prices in NSW?
Switchboard upgrades create the biggest surprises. Long cable runs also create surprises, especially when the battery location sits far from the main board. Difficult mounting locations can add time and materials. Storage goals can also change mid-process, and that can turn a one-battery quote into a two or three-battery quote.
How does the Cheaper Home Batteries Program affect battery cost in NSW?
The program can reduce upfront cost through a discount mechanism linked to certificates. The rules focus on batteries installed with solar, and the discount reduces over time. The installer usually applies the discount in the quote, so the paperwork and eligibility checks matter.
Can staged expansion affect Cheaper Home Batteries Program eligibility?
Staged expansion can create issues because certificate rules can limit repeat claims at the same premises. This matters more with 5 kWh modules because many households plan to add a second or third unit later. A good installer will explain how the first claim rule affects the expansion plan.
What questions help compare Enphase FlexPhase quotes fairly in NSW?
These questions usually expose missing scope fast.
- Does the quote include all Enphase control and monitoring equipment required for the chosen setup?
- Does the quote include switchboard upgrades if the board lacks space or protection devices?
- Does the quote include commissioning and app setup?
- Does the quote include the backup scope and the circuits covered?
- Does the quote include allowances for cable run length and wall mounting work?
- Does the quote show how the Cheaper Home Batteries Program discount applies?
Works Cited
NSW Government, NSW Climate and Energy Action. Install a battery. NSW Climate and Energy Action
NSW Government, NSW Climate and Energy Action. Residential batteries. NSW Climate and Energy Action
Clean Energy Regulator. Cheaper Home Batteries Program. Clean Energy Regulator
Clean Energy Regulator. Solar batteries (SRES) information page. Clean Energy Regulator
Department of Climate Change, Energy, the Environment and Water. Eligibility information for the Cheaper Home Batteries Program. DCCEEW
Enphase Energy. IQ Battery 5P data sheet (ANZ). Enphase
Enphase Energy. IQ Battery 5P with FlexPhase product page (AU store). Enphase
Enphase Energy. IQ Battery 5P with FlexPhase power ratings. Enphase
Enphase Energy. Enphase Energy Limited Warranty: IQ Battery 5P (AU). Enphase
