The inverter is the heart of your solar system, converting the electricity your panels generate into power your home can use. Choosing the right inverter affects performance, longevity, and future expandability.
What Does an Inverter Do?
Solar panels produce direct current (DC) electricity, but your home runs on alternating current (AC). The inverter:
- Converts DC to AC: Essential for home use
- Maximises output: Tracks optimal operating point (MPPT)
- Ensures safety: Disconnects during grid outages
- Monitors performance: Tracks generation and issues
- Manages export: Controls power sent to grid
Inverter Types Compared
String Inverters
The most common residential option:
How they work:
- Panels wired in "strings" (series connection)
- One central inverter handles all panels
- Typically mounted in garage or on external wall
Pros:
- Cost-effective
- Proven technology
- Easy to service
- Good efficiency (96-98%)
Cons:
- String affected by worst-performing panel
- Single point of failure
- Less ideal for shaded roofs
- Limited panel-level monitoring
Best for: Unshaded roofs, simple installations, budget-conscious buyers
Microinverters
Individual inverter per panel:
How they work:
- Small inverter attached behind each panel
- Each panel operates independently
- AC power from roof to switchboard
Pros:
- Panel-level optimisation
- No single point of failure
- Better for shaded/complex roofs
- Detailed panel monitoring
- Longer warranties (25 years)
Cons:
- Higher upfront cost (+20-30%)
- More components on roof
- Harder to service (roof access)
Best for: Shaded roofs, multiple orientations, complex roof shapes, premium installs
Hybrid Inverters
Combines solar and battery capability:
How they work:
- Manages solar, battery, and grid
- Can operate during blackouts (with battery)
- Allows battery addition later
Pros:
- Battery-ready without extra equipment
- Backup power capability
- Single point of monitoring
- Future-proof investment
Cons:
- Higher cost than standard string
- Features unused if no battery
- Some have lower efficiency
Best for: Planning battery now or later, wanting backup power, future-proofing
Top Inverter Brands in 2026
Fronius (Premium)
Austrian manufacturer, consistently rated #1 in Australia:
| Model | Capacity | Efficiency | Price |
|---|---|---|---|
| Primo GEN24 | 3-6 kW | 97.0% | $2,000-$2,800 |
| Symo GEN24 | 6-10 kW | 97.0% | $2,800-$3,500 |
| Tauro | 50-100 kW | 98.0% | Commercial |
Key features:
- 10-year warranty standard
- SuperFlex technology for challenging roofs
- Hybrid-ready with battery integration
- Premium build quality
- Industry-leading monitoring (Solar.web)
Typical lifespan: 15+ years
Sungrow (Value Leader)
Chinese manufacturer offering excellent value:
| Model | Capacity | Efficiency | Price |
|---|---|---|---|
| SG-RS | 3-6 kW | 98.4% | $800-$1,200 |
| SG-RT | 8-10 kW | 98.5% | $1,200-$1,600 |
| SH-RS (Hybrid) | 3-10 kW | 97.8% | $1,800-$2,500 |
Key features:
- 10-year warranty
- High efficiency (among the best)
- Strong Australian presence
- Good monitoring app
- Competitive pricing
Typical lifespan: 12-15 years
Enphase (Microinverters)
American company dominating microinverter market:
| Model | Per Panel | Efficiency | Price (per unit) |
|---|---|---|---|
| IQ8+ | 290-390W | 97.0% | $180-$220 |
| IQ8M | 330-440W | 97.0% | $200-$240 |
| IQ8A | 350-480W | 97.0% | $220-$260 |
Key features:
- 25-year warranty (industry leading)
- Panel-level monitoring and optimisation
- Grid-forming capability (some models)
- Exceptional reliability
- Easy expansion
Typical lifespan: 20-25 years
Other Notable Brands
| Brand | Type | Strength | Price Point |
|---|---|---|---|
| SMA | String | German quality, 25-year history | Premium |
| GoodWe | Hybrid | Battery integration, value | Mid-range |
| Growatt | String | Budget option, improving quality | Budget |
| Delta | String | Industrial heritage, reliable | Mid-range |
Sizing Your Inverter
The Oversizing Rule
In Australia, you can connect up to 133% of inverter capacity in panels:
| Inverter Size | Maximum Panel Capacity |
|---|---|
| 5 kW | 6.65 kW |
| 6 kW | 8.0 kW |
| 8 kW | 10.64 kW |
| 10 kW | 13.3 kW |
Why oversize panels?
- Panels rarely hit peak output
- More energy in morning/afternoon
- Better winter performance
- Maximises inverter use
Single vs Three-Phase
| Feature | Single Phase | Three Phase |
|---|---|---|
| Common in | Older homes, apartments | Newer homes, larger properties |
| Inverter options | All brands available | Wider selection |
| Export capability | Often limited to 5kW | Higher limits available |
| Cost | Lower | Slightly higher |
Check your switchboard or electricity bill to confirm your phase type.
Features to Consider
Essential Features
Every quality inverter should have:
- High efficiency: 96%+ (97%+ preferred)
- MPPT tracking: Maximum power point tracking
- Australian standards compliance: AS/NZS 4777.2:2020
- Warranty: Minimum 10 years
- Remote monitoring: App access to data
Valuable Extras
Consider these based on your needs:
| Feature | Benefit |
|---|---|
| Hybrid capability | Add battery later |
| Backup power | Function during outages |
| Multiple MPPT | Different roof orientations |
| Built-in DC isolator | Cleaner installation |
| Smart export control | Dynamic export limiting |
Monitoring Quality
Good monitoring provides:
- Real-time generation data
- Historical performance graphs
- Error notifications
- Energy consumption tracking
- Weather-adjusted expectations
Common Questions
How long do inverters last?
| Type | Expected Lifespan |
|---|---|
| Budget string | 10-12 years |
| Quality string | 15+ years |
| Premium string | 15-20 years |
| Microinverters | 20-25 years |
Plan for one inverter replacement over your panels' lifetime.
What size inverter do I need?
General guidelines:
| Home Size | Typical System | Inverter Size |
|---|---|---|
| Apartment/small | 4-5 kW panels | 3-4 kW |
| Average home | 6.6 kW panels | 5 kW |
| Large home | 10 kW panels | 8 kW |
| Very large | 13+ kW panels | 10 kW |
Can I add battery later?
With planning, yes:
- Hybrid inverter: Easiest, just add battery
- Standard inverter: Need AC-coupled battery
- Microinverters: Need separate battery inverter
If battery is possible, hybrid inverters save money long-term.
What about warranty claims?
Quality brands handle warranties well:
- Fronius: Australian support, swap units
- Sungrow: Strong local presence, quick response
- Enphase: Panel-level replacement, minimal disruption
Choose brands with Australian offices and support.
Installation Considerations
Location
Inverters should be installed:
- Protected from weather (under eave or in garage)
- Away from direct sunlight
- With adequate ventilation
- Accessible for servicing
- Away from bedrooms (slight hum)
Grid Connection
Your inverter must be:
- Approved by your network (Powercor/Jemena/AusNet)
- Configured to local grid requirements
- Set with appropriate export limits if required
- Tested and certified by installer
Price Comparison
For a 6.6 kW system in 2026:
| Option | System Cost | Inverter Portion |
|---|---|---|
| Budget (Growatt) | $4,500-$5,000 | ~$700 |
| Value (Sungrow) | $5,000-$6,000 | ~$1,100 |
| Premium (Fronius) | $6,000-$7,000 | ~$2,200 |
| Microinverters (Enphase) | $7,000-$8,500 | ~$3,000 |
The inverter typically represents 20-35% of system cost.
Our Recommendations
Best Overall Value
Sungrow SG-RS series — High efficiency, strong warranty, competitive price
Best Premium Option
Fronius GEN24 — Exceptional quality, hybrid-ready, superior monitoring
Best for Shaded Roofs
Enphase IQ8+ — Panel-level optimisation, 25-year warranty
Best for Future Battery
Sungrow SH-RS Hybrid — Battery-ready, excellent value
The Bottom Line
Your inverter choice significantly impacts system performance and longevity:
- Don't cheap out: Inverters fail before panels—quality matters
- Match to your roof: Shading needs microinverters or optimisers
- Consider batteries: Hybrid inverters future-proof your system
- Choose reputable brands: Australian support is essential
- Check efficiency: 97%+ saves money over time
The inverter is where spending extra delivers real returns over your system's lifetime.
Contact H.T Electrics and Solar to discuss which inverter best suits your home and energy goals.
