The ultimate home energy setup combines solar panels, battery storage, and an EV charger into one integrated system. When designed correctly, this combination can dramatically reduce or eliminate your household energy costs while providing backup power and clean transportation. Here's how to make it work in Victoria.
The Vision: Energy Independence
Imagine this daily scenario:
- 6am-9am: Your solar panels start generating as the sun rises
- 9am-3pm: Excess solar charges your home battery and EV
- 3pm-9pm: Battery powers your home during expensive peak hours
- Evening: You drive home in your EV, charged by free solar
- Night: Battery continues powering essentials
This isn't a future dream — it's achievable today with the right system design.
System Components
1. Solar Panels (Foundation)
For a complete home energy system, you'll typically want a larger system:
| Household + EV | Recommended Solar |
|---|---|
| Small home + EV | 8-10 kW |
| Medium home + EV | 10-13 kW |
| Large home + 2 EVs | 13-20 kW |
Why Bigger? An EV adds 3,000-5,000 kWh of annual energy needs. A standard 6.6 kW system may not be enough.
2. Battery Storage (Energy Optimisation)
Battery sizing for a complete system:
| Configuration | Recommended Battery |
|---|---|
| Solar + Battery only | 10-13 kWh |
| Solar + Battery + 1 EV | 13-20 kWh |
| Solar + Battery + 2 EVs | 20+ kWh |
3. EV Charger (Transportation)
A smart charger that integrates with your solar system:
- Recommended: Zappi, Wallbox, or Fronius Wattpilot
- Power: 7 kW single-phase (most homes)
- Key Feature: Solar surplus charging mode
Designing Your System
Step 1: Analyse Your Energy Usage
Before sizing your system, understand your current and future needs:
| Component | Typical Annual Usage |
|---|---|
| Average Victorian home | 5,000 kWh |
| Home with EV (15,000 km/year) | +2,500 kWh |
| Home with pool/AC | +2,000 kWh |
| Total (example) | 9,500 kWh |
Step 2: Size Your Solar
Your solar system should generate more than your total usage to account for:
- Winter generation dip
- Cloudy days
- Degradation over time
Rule of thumb: System size (kW) × 1,400 = Annual generation (kWh) in Melbourne
For 9,500 kWh usage: 9,500 ÷ 1,400 = 6.8 kW minimum → Recommend 10 kW
Step 3: Size Your Battery
Consider:
- Evening usage (typically 8-15 kWh)
- Desired backup duration
- Budget
For most homes with EV: 13-15 kWh provides excellent balance
Step 4: Choose Your EV Charger
- Match to your EV's onboard charger capacity
- Ensure solar integration compatibility
- Consider future needs (second EV?)
Complete System Costs (Before Rebates)
Example: Medium System
| Component | Cost Range |
|---|---|
| 10 kW Solar System | $9,000-$12,000 |
| 13 kWh Battery | $13,000-$16,000 |
| 7 kW EV Charger | $2,000-$2,500 |
| Installation (integrated) | $2,000-$4,000 |
| Total Before Rebates | $26,000-$34,500 |
Stacking All Available Rebates
Here's where Victoria shines — you can combine multiple incentives:
Solar Rebates
| Incentive | Value |
|---|---|
| Solar Victoria Rebate | $1,400 |
| STCs (10 kW system, ~56 certs) | $2,240 |
| Solar Total | $3,640 |
Battery Rebates
| Incentive | Value |
|---|---|
| Cheaper Home Batteries (30%) | $4,500 |
| Battery STCs (13 kWh × 8.4 × $40) | $4,368 |
| VPP Bonus | $400 |
| Battery Total | $9,268 |
Total Rebates
| Category | Rebate Value |
|---|---|
| Solar | $3,640 |
| Battery | $9,268 |
| Total Savings | $12,908 |
Net System Cost
| Amount | |
|---|---|
| Total Before Rebates | $30,000 |
| Less: All Rebates | -$12,908 |
| Net Investment | $17,092 |
Financial Analysis
Annual Savings Breakdown
| Source | Annual Savings |
|---|---|
| Solar self-consumption | $1,200 |
| Battery optimisation | $600 |
| EV charging (vs petrol) | $2,000 |
| Feed-in income | $400 |
| VPP participation | $300 |
| Total Annual Benefit | $4,500 |
Payback Period
- Net Investment: $17,000
- Annual Savings: $4,500
- Simple Payback: 3.8 years
25-Year Projection
| Metric | Value |
|---|---|
| Total Energy Savings | $50,000+ |
| EV Fuel Savings | $50,000+ |
| Potential VPP Income | $7,500 |
| Total 25-Year Benefit | $107,500+ |
System Integration Tips
1. Hybrid Inverter Choice
Choose a hybrid inverter that can manage solar, battery, and potentially EV charging:
- Fronius Primo GEN24: Excellent all-rounder
- SolarEdge Energy Hub: Great with optimisers
- Sungrow Hybrid: Budget-friendly option
2. Smart Energy Management
Look for systems with:
- Automatic load prioritisation
- Weather-based charging forecasts
- Time-of-use optimisation
- App-based monitoring
3. Backup Power Design
Decide which circuits need backup power during outages:
- Essential: Lights, fridge, internet, charging
- Nice-to-have: Heating/cooling, cooking
- Usually excluded: Pool, hot water (high draw)
4. Future-Proofing
- Size your inverter for battery addition later
- Ensure switchboard can handle future EV charger
- Consider three-phase for flexibility
Installation Timeline
| Phase | Duration |
|---|---|
| Initial consultation | 1 week |
| System design | 1-2 weeks |
| Approvals & ordering | 2-4 weeks |
| Solar installation | 1-2 days |
| Battery installation | 1 day |
| EV charger installation | Half day |
| Grid connection | 1-2 weeks |
| Total | 6-10 weeks |
Act Before May 2026
Critical Deadline: STC values for both solar and batteries will decrease from 1 May 2026. Installing a complete system before this date could save an additional $2,000-$3,000.
The Bottom Line
A complete home energy system (solar + battery + EV charger) in Victoria:
- Costs: ~$17,000 after all rebates
- Saves: ~$4,500 per year
- Pays back: In under 4 years
- 25-year benefit: $100,000+
Beyond the financial returns, you'll enjoy:
- Near-zero electricity bills
- Near-zero fuel costs
- Backup power during outages
- Reduced carbon footprint
- Protection from future price rises
Contact H.T Electrics and Solar to design your complete home energy system. We handle everything — solar, battery, and EV charger installation — for a seamless, integrated solution.
