What Does a Solar Inverter Do?
Solar panels produce direct current (DC) electricity, but your home uses alternating current (AC). The inverter's job is to convert DC to AC. It's the "brain" of your solar system.
Types of Solar Inverters
1. String Inverters
How they work: All panels connect to a single central inverter (usually mounted on a wall near your electrical panel).
Pros:
- Lower cost ($0.20-$0.40 per watt vs. $0.50-$0.80 for microinverters)
- Simpler installation
- Easier to maintain (one unit to troubleshoot)
Cons:
- If one panel is shaded, the whole string's output drops
- Shorter warranty (10-12 years vs. 25 years for microinverters)
- No per-panel monitoring
Best for: Unshaded roofs with uniform panel orientation.
Top brands: SMA, Fronius, Growatt, SolarEdge (with optimizers).
2. Microinverters
How they work: Each panel has its own small inverter mounted under it on the roof.
Pros:
- Panel-level optimization — shading on one panel doesn't affect others
- 25-year warranty (matches panel warranty)
- Per-panel monitoring
- Better for complex roofs (multiple angles, partial shading)
Cons:
- Higher cost
- More components to potentially fail (though failure rate is low)
- Roof access needed for service (though rare)
Best for: Shaded roofs, complex roof layouts, homeowners who want maximum production.
Top brands: Enphase (IQ8 series), APS (alternatives in some markets).
3. Power Optimizers + String Inverter
How they work: Power optimizers at each panel condition the DC power, then send it to a central string inverter.
Pros:
- Panel-level optimization at lower cost than microinverters
- Per-panel monitoring
- Central inverter is easier to service than roof-mounted microinverters
Cons:
- Still has a central point of failure (the string inverter)
- Less proven than pure microinverter systems
Best for: Homeowners who want panel-level monitoring at a lower cost than microinverters.
Top brand: SolarEdge.
4. Hybrid Inverters (for Solar + Storage)
How they work: Hybrid inverters can manage both solar panels and battery storage in one unit.
Pros:
- Single unit for solar and batteries (cleaner installation)
- Can operate off-grid during outages
- Future-proof if you plan to add batteries later
Cons:
- Higher cost than standard inverters
- More complex installation
Best for: Homeowners planning to add batteries now or in the future.
Top brands: SolarEdge Home Hub, Enphase IQ System Controller, SMA Sunny Boy Storage.
Comparison Table
| Type | Cost | Shade Tolerance | Monitoring | Warranty |
|---|---|---|---|---|
| String Inverter | $0.20-0.40/W | Poor | System-level | 10-12 years |
| Microinverters | $0.50-0.80/W | Excellent | Panel-level | 25 years |
| Power Optimizers | $0.35-0.55/W | Good | Panel-level | 25 years (optimizers), 12 years (inverter) |
| Hybrid Inverter | $0.60-1.00/W | Good (with optimizers) | System or panel-level | 10-25 years |
How to Choose
- Roof shading: If heavy shading, choose microinverters or power optimizers.
- Budget: If budget is tight and roof is unshaded, string inverter is fine.
- Future battery plans: If adding batteries later, choose a hybrid inverter or Enphase/SolarEdge ecosystem.
- Roof complexity: Multiple angles or orientations? Microinverters handle this best.
Top Inverter Brands in 2026
- Enphase: Market leader in microinverters; excellent reliability; IQ8 series handles high-power panels.
- SolarEdge: Leading power optimizer brand; strong API; good for solar+storage.
- SMA: German engineering; reliable string inverters; strong in commercial.
- Fronius: Austrian brand; high-quality string inverters; excellent service.
- Growatt: Chinese brand; budget-friendly; growing U.S. presence.