String Inverter vs Microinverter: Which Should You Choose?
The inverter choice affects system performance, cost, monitoring capability, and future expandability. Here's the direct comparison — and what matters most for residential installs.
| Property | String Inverter | Microinverter | Hybrid Inverter |
|---|---|---|---|
| Cost | Lowest | 30–40% more | Mid-high |
| Shading impact | One panel affects all | Per-panel optimization | Depends (with DC optimizers) |
| Monitoring | System level | Per-panel level | System + battery |
| Battery ready? | No (needs separate) | No (needs separate) | Yes — built-in |
| Failure impact | System down | Only 1 panel affected | System down |
| Lifespan | 10–15 years | 25 years (per unit) | 10–15 years |
| Best for | Simple unshaded roofs | Complex/shaded roofs | Anyone adding battery |
The shading problem: why it matters
With a string inverter, your panels are wired in series. When one panel is shaded, it acts like a kink in a hose — the whole string underperforms. Microinverters operate each panel independently. If your roof has chimneys, skylights, trees, or multiple orientations, microinverters recover significantly more energy.
The hybrid case: plan ahead if you want a battery
Installing a string inverter today and adding a battery later means either replacing the inverter or adding a separate AC-coupled battery (more expensive, less efficient). A hybrid inverter handles both — it's the right choice if you plan to add storage within 5 years. Given falling battery prices, most installers now recommend hybrid.
Our recommendation
- Simple south-facing roof, budget-first: String inverter (SMA Sunny Boy, Fronius Primo)
- Shading or complex roof: Microinverter (Enphase IQ8+)
- Planning to add battery (recommended for most): Hybrid inverter (SolarEdge, GoodWe, Fronius GEN24)