As more Victoria homeowners adopt solar and battery storage, understanding battery backup types becomes crucial. One of the most asked questions from homeowners is:
“What’s the difference between partial and full backup – and which battery brands offer what?”
If you’re planning for blackouts, bushfire readiness, or just want energy independence, choosing the right backup type and battery model could make or break your investment.
Let’s unpack the difference – and show which battery models available for Victoria homes (as of August 2025) offer partial vs full backup.
What Is a Partial Backup?
A partial backup battery system powers only essential appliances during a blackout. These include:
- Fridge
- Lights
- Wi-Fi router
- Security systems
- Some power points
It does not support high-load devices like:
- Air conditioners
- Induction cooktops
- Electric ovens
- Pool pumps
Pros of Partial Backup
- Cheaper inverter and battery setup
- Simpler installation
- Sufficient for most blackouts (especially short-term)
Cons
- Limited appliance use
- Can’t go “fully off-grid” in outage scenarios
What Is a Full Backup?
A full backup battery system can power your entire home, including high-load appliances.
But there’s a catch: the system must be designed to handle high currents, and your inverter must support islanding mode, which isolates the home from the grid during outages.
Pros of Full Backup
- Comfort during blackouts – you can run everything
- True energy independence
- Useful for homes with medical equipment or remote locations
Cons
- Requires larger battery capacity and inverter
- More expensive
- Not all batteries/inverters support it
Which Battery Brands Provide Full vs Partial Backup?
Batteries That Offer Full Backup
These battery systems are designed to support whole-of-home backup when properly configured:
Alpha ESS Smile M5 + SMILE-M-BAT-5P
- Stackable up to 30 kWh
- Supports full backup via AC or hybrid inverters
- Best for full home usage with appropriate inverter selection
Sigenergy SigenStor EC Series + BAT 8.0
- Offers full backup with 5 kW or larger EC hybrid inverters
- Built-in UPS (uninterrupted power supply) functionality
- Stackable up to 46.8 kWh
- Supports large household loads
Sungrow SBH Series (New)
- 3-phase ready; supports full backup with 3-phase hybrid inverters
- Stackable to 40 kWh+
- Popular for larger homes and 3-phase properties
Anker SOLIX (ANK-X1 Series + B5 Batteries)
- Up to 30 kWh backup with inverter upgrade
- Full home backup available if sized correctly
- Powerful hybrid options with seamless switching
Batteries That Offer Partial Backup Only (Out of Box)
These batteries are generally suited for partial backup unless custom-configured:
ESY SunHome (HM Series)
- Max 29.18 kWh usable
- Suited for essential loads during outages
- Does not natively support full backup without extra hardware
Goodwe Lynx Home F Series
- Max backup depends on inverter model (GW5000N-EH)
- Works well for partial backup (fridges, lights, etc.)
- Full backup possible but requires advanced design and may not be ideal
SAJ B2 Series
- Scalable up to 40.5 kWh
- Best for partial backup
- Full backup possible but load-dependent
- Limited local support availability as of mid-2025
Choosing Between Partial vs Full Backup
Criteria | Partial Backup | Full Backup |
Budget | Lower | Higher |
Complexity | Simple setup | Complex wiring and inverter config |
Appliance Support | Lights, fridge, Wi-Fi | Entire house including AC, oven |
Ideal For | Budget-conscious homes | Energy independence, large families |
Brands (2025) | ESY SunHome, SAJ, Goodwe | Alpha ESS, Anker SOLIX, Sigenergy |
What to Ask Before Choosing?
1. What appliances do you need during a blackout?
○ If it’s just lights and fridge – partial backup will do.
2. Do you have a 3-phase or single-phase home?
○ Full backup is easier on 3-phase systems.
3. How much battery capacity do you actually need?
○ Oversizing without enough solar can lead to wasted investment.
4. Will you add EV charging or all-electric cooking in future?
○ Plan for future energy needs with full backup readiness.
Government Compliance & Real-World Considerations
The SAA and state safety regulators recommend correct inverter-battery pairing with compliant backup transfer switches. Always use a SAA accredited installer for battery backup systems.
Also, Amazing Solar includes a system performance disclaimer for larger setups (20 kWh+), since battery charge rates may be affected by:
- Winter/cloudy weather
- Inverter limitations
- Solar system capacity
Conclusion: What Should You Choose?
Choose Partial Backup if:
- You’re on a budget
- You only want the essentials during outages
- You’re not using high-load appliances often
Choose Full Backup if:
- You want to power your whole home
- You have critical equipment or off-grid ambitions
- You’re using reliable brands like Alpha ESS, Anker, or Sigenergy
Both options have their place – and Amazing Solar is here to help you design the right system for your needs and budget.
Looking for battery backup solutions in Victoria? Call Amazing Solar Solutions on 1300 025 955 today.
