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ROI visualisation dashboard

General information, not financial advice. Rebates and tariffs change.

Quick answer

Enter your quote below to see the year your battery pays itself off, priced at Synergy's A1 rate of 33.26c/kWh plus DEBS export credits and, if you join a VPP, Battery Rewards.

Sources: Synergy A1 tariff · Synergy DEBS schedule · Synergy Battery Rewards

Your battery details

Enter your battery specifications to see ROI projections

Battery Capacity (kWh)

Battery Price After Rebates ($)

Daily Usage (kWh)

Solar System (kW)

ROI Dashboard

Visualize your battery investment returns over time

Scenario

Timeframe

Payback Period

10.9 years

Annual Savings

$1,215

10Y Net Return

-$886

Net ROI

-7%

Year-by-year breakdown

Year 1

+$1,215$1,215

Year 2

+$1,191$2,406

Year 3

+$1,167$3,573

Year 4

+$1,144$4,717

Year 5

+$1,121$5,837

Year 6

+$1,098$6,936

Year 7

+$1,076$8,012

Year 8

+$1,055$9,067

Year 9

+$1,034$10,101

Year 10

+$1,013$11,114

Notes:

• Calculations include 2% annual degradation
• Grid avoidance savings based on A1 tariff (33.26c/kWh)
• Solar meets daytime use directly; the battery covers evening and overnight use (outside solar hours), taken as 60% of daily usage
• DEBS export credited at 10c/kWh in the 3-9pm peak window and 2c/kWh outside it (assumes 50% of exports at peak)
• VPP credits estimated at ~$44/year based on Synergy Battery Rewards (70¢/kWh × 70% discharge × ~9 events/year)
• Does not include potential electricity price increases

ROI uses Synergy A1 + DEBS rates, assumes a 92% round-trip efficiency and 95% depth-of-discharge, and projects over a 10-year horizon. The battery only saves on solar your system would otherwise export, so with no solar only VPP credits remain. Rebates are not calculated here: enter a price that already has the federal STC discount and WA Battery Rebate taken off.

Financial Information Disclaimer

This information is general in nature and does not constitute financial, tax, or legal advice. Rebate amounts, eligibility, and tariff rates change frequently and may not be current.

Consult a licensed financial advisor, tax professional, and electricity retailer to understand your specific situation. We are not responsible for financial decisions made based on this information.

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Understanding your ROI

Payback period: How long before your savings add up to what you paid. The payback figure above is the estimate for the details you entered, and it moves with your usage, solar, battery size and price.
Net return: Your savings so far, minus what the battery cost. Green bars are the years you are ahead. We assume the battery loses 2% of its capacity a year.
Scenarios: Compare joining a VPP against not joining, and see what sending more power to the grid between 3pm and 9pm is worth.
What we hold steady: Today's electricity prices, held flat for every year shown. WA prices have historically risen rather than fallen, so treat the payback year as a conservative one.

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