Optimal size
15.0 kWh
Net cost $10,688 • saves $1,940/yr
Active plan
TOU 58.7 / 50.8 / 35.3¢ · supply $2.03/day · FiT 3.0¢
NPV
$3,612
Discounted at your hurdle rate
IRR
11.9%
Beats your minimum return target
Disc. payback
7.7 yrs
Break-even within 12-yr life
How this plan is modeled. The battery stores excess solar and later reduces household imports. Ordinary solar export can still happen when the battery is full or charging is constrained.
NPV vs battery size
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IRR vs battery size
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Discounted payback vs battery size
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Annual savings by tariff bucket × battery size — Current Origin Standing
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The battery stores excess solar first and later reduces household imports. Any solar export shown is ordinary residual solar export, not intentional battery export.
Typical day hourly profile — Current Origin Standing
Typical-day profile unavailable for this scenario.
Shaded: import p25–p75 band. Red solid: current import median. Red dashed: simulated import after the optimal battery. Gold solid: current export median. Gold dashed: simulated export after the optimal battery.
Cashflow profile — optimal 15.0 kWh — Current Origin Standing
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Recommendation
Current Origin Standing · 15.0 kWh
- Baseline annual bill: $6,917
- Year-1 saving: $1,940
- Net upfront after rebate: $10,688
- Discounted NPV over 12 years: $3,612
- IRR: 11.9%
- Discounted payback: 7.7 yrs
- Tariff fidelity: Exact
Verdict: IRR (11.9%) is well above your minimum return target.