What is a solar inverter?
A solar inverter converts the direct current (DC) electricity your panels produce into the alternating current (AC) your home and the grid use. It is the brain of the system. The main types are string inverters (one unit for the whole array), hybrid inverters (string inverters that also manage a battery), and microinverters (one small unit per panel).
The three types
- String inverter: cheapest and most common; one unit for the array.
- Hybrid inverter: a string inverter that is also battery-ready, ideal if you plan storage.
- Microinverters: one per panel, so shading on one panel does not drag the rest down.
Choosing the right inverter
If you want a battery now or later, a hybrid inverter saves cost down the line. If your roof has shading or faces several directions, microinverters or optimisers help. The inverter typically works hardest in the system and may need replacing once over 25 years (around £800 to £1,500), so a good brand and warranty matter.
Frequently asked questions
- How long do solar inverters last?
- Often 10 to 15 years, so most systems need one inverter replacement over their life. Hybrid inverters and good brands can last longer.
- Where is the inverter installed?
- Usually in a loft, garage or utility space, somewhere cool and ventilated with access for maintenance.
Related questions
Indicative estimates based on UK average data. Last updated 27 May 2026.