Solar inverters and choosing the right type
Inverters convert the direct current (DC) electricity produced by solar panels into alternating current (AC) used by home appliances and the grid. The inverter type influences system performance, shading tolerance and monitoring capabilities.
Common inverter types
- String inverters: A single inverter handles multiple panels wired in series strings. They are cost-effective and reliable but performance can drop if one panel is shaded or underperforming, which affects the whole string.
- Microinverters: Small inverters installed behind each panel convert DC to AC at the module level. They maximize production in partially shaded roofs and provide panel-level monitoring but cost more.
- Power optimizers with string inverter: Optimizers sit at each panel to condition the DC output, while a central string inverter completes conversion to AC. This offers many benefits of microinverters at a mid-range price point.
Choosing the right inverter
- Roof shading and layout: If panels face multiple directions or shading is likely, microinverters or optimizers improve production consistency.
- Budget: String inverters usually have the lowest upfront cost for large unshaded arrays.
- Monitoring needs: Microinverters and optimizer systems often provide panel-level monitoring helpful for diagnostics and performance tracking.
- Battery compatibility: If you plan to add batteries, confirm inverter compatibility for backup or hybrid operation.
Other considerations
- Warranty length: Inverter warranties vary from 5 to 25 years depending on model and manufacturer; longer warranty often indicates confidence in longevity.
- Efficiency ratings: Look for high conversion efficiency to reduce energy loss.
- Serviceability: Central string inverters are easier to access when mounted at ground level; microinverters are distributed on the roof and may be harder to replace.
Discuss your roof specifics, shading and future plans with an installer. They can recommend an inverter solution that balances cost, performance and resilience for your home.