Inverters guide
String inverters vs microinverters
Most home systems use either one central string inverter or a microinverter on each panel. Neither is right for every roof — here's how to think about the choice.
How they differ
String inverter
Panels are wired together in strings feeding one inverter. Simple, widely used and easy to service. On a string, a shaded or underperforming panel can pull down the output of the others.
Microinverters
Each panel has its own small inverter, so panels work independently and can be monitored individually. More electronics on the roof, and replacing one means going up there.
Optimisers
Panel-level electronics paired with a central inverter. They reduce the impact of shading and allow panel-level monitoring while keeping the main inverter accessible.
Panel-level electronics are worth asking about if
- Parts of your roof are shaded at different times of day (trees, chimneys, neighbouring buildings)
- Your panels will face several directions
- You want to see how each panel is performing
- You may extend the system later, one or two panels at a time
What to ask installers
Ask why they've recommended one approach for your roof, what it means for warranties and servicing, and how any rooftop electronics would be replaced if they failed.
If you're planning a battery, ask how each option works with the battery you might add.
Sources
Facts on this page were checked on 26 September 2026. Rules and programs change, so confirm details with your installer.
Frequently asked questions
Are microinverters always better?
No. On an unshaded roof facing one direction, a quality string inverter can work very well. Microinverters and optimisers mainly help where panels would otherwise hold each other back.
See what installers suggest for your roof
Compare quotes from participating installers in your area.
Get solar quotes