What Size Battery Do You Need for a 13kW Solar System in Victoria?
A 13kW solar system is one of the most popular choices for medium to large Victorian homes, especially in suburbs like Tarneit, Point Cook, Clyde North, Doreen, Craigieburn, Pakenham, and Officer. But one of the most common questions homeowners ask us is:
“What size battery for 13kW solar system to maximise savings?”
The answer depends on energy usage, household size, heating/cooling systems, and whether you want backup power. Below, we break it down clearly using real Victorian data and installations.
How Much Energy Does a 13kW Solar System Produce in Victoria?
In most parts of Melbourne and regional Victoria, a 13kW solar system generates on average:
- 45–55 kWh per day
- More in summer, slightly less in winter
- Higher output in western and northern suburbs due to roof orientation and sun hours
Without a battery, excess solar is exported to the grid at low feed-in tariffs. That’s where battery storage becomes critical.
Recommended Battery Size for a 13kW Solar System
Here’s a simple guide based on Victorian household profiles:
🔋 Minimum Battery: 20kWh
- Suitable for moderate night usage
- Covers evening appliances, lighting, and partial heating
- Ideal if you’re home mostly during the day
🔋 Optimal Battery Size: 30–40kWh
- Best for families with EVs, ducted heating/cooling, heat pump hot water
- Maximises self-consumption
- Reduces grid reliance during peak tariff hours
🔋 Premium Setup: 40kWh+
- Full home energy coverage
- Excellent for all-electric homes
- Strong backup capability during outages
- Future-proof for rising electricity prices
👉 This is why many Victorian homeowners now choose 30–42kWh battery systems with their 13kW solar.
Real Victorian Installations: 13kW Solar Systems with 40–42kWh Batteries
To see how this works in real life, check out our recent installation in Donnybrook, VIC:
👉 13kW Solar + 42kWh Battery Installation in Donnybrook, Victoria
Another installation in Doreen, VIC: 13kW Solar + 40kWh battery in Doreen Victoria
Results from these systems:
- Over 85% energy self-consumption
- Massive reduction in quarterly electricity bills
- Backup power for essential circuits
- Optimised for Victorian peak pricing
Such setups are becoming the gold standard for larger homes across Melbourne’s growth suburbs.
Why Battery Size Matters More in Victoria
Victorian households face:
- Rising peak electricity rates
- Reduced feed-in tariffs
- Increased electrification (EVs, heat pumps, induction cooking)
A correctly sized battery allows you to:
✔ Store excess solar instead of exporting it cheaply
✔ Use your own power during expensive evening peaks
✔ Protect your home from outages
✔ Maximise return on your solar investment
Why Victorians Trust Green Electric Solutions
We’re not just another solar company — we’re a local Victorian energy partner.
✅ New Energy Tech Approved Provider
✅ SAA Certified Installers
✅ 10,000+ Installations Across Victoria
✅ 5+ Years in Business
✅ Industry-Leading After-Sales Support
✅ Hundreds of Happy Customers & 5-Star Reviews
From Melbourne metro to Geelong, Croydon, Plumpton, and Gippsland, our team designs systems specifically for Victorian homes and conditions.
Which Battery Brand Is Best for a 13kW System?
We only install proven, high-performance batteries suited to Victoria, including:
- Modular expansion options
- High cycle life
- VPP compatibility
- Strong warranties
Our experts assess your:
- Daily & nightly usage
- Roof orientation
- Future upgrades (EVs, heat pumps)
- Eligibility for Victorian rebates
Final Verdict: Best Battery Size for 13kW Solar in Victoria
Most Victorian homes with a 13kW solar system perform best with a 30–42kWh battery (We already shared two real cases from Doreen and Donnybrook).
This balance delivers:
- Maximum savings
- Faster payback
- Energy independence
- Long-term protection against rising power costs
⚡ Find the Perfect Battery Size for Your Home
Not sure which battery size is right for your household?
👉 Get a FREE Solar & Battery Assessment
- Personalised for your suburb
- Rebates checked instantly
- No obligation
- Expert NET-approved advice
📞 Request a Free Call Back Today