Russell Andrews
There is no single best solar inverter for every home. The right choice depends on your roof, whether you plan to add a battery, and how much you value a long warranty. This guide to the best solar inverters UK homeowners are choosing in 2026 covers the brands most often compared, what each does well, and what to check before you agree to one.
If you want the basics first, read how solar inverters work. For the choice between inverter types, see our string vs micro-inverters guide. You can also see how REST approaches inverters and smart equipment on our inverters and smart tech page.
By Russell Andrews
SolarEdge: suited to shaded or complex roofs
SolarEdge pairs a central inverter with a small power optimiser fitted behind each panel. If one panel is shaded or dirty, it does not pull down the output of the whole string the way a plain string inverter can. It also works with SolarEdge's own battery range for DC-coupled storage, where the battery is charged directly from the panels' output.
Enphase: panel-level control and a long warranty
Enphase makes true microinverters, with one small unit per panel instead of optimisers feeding a central inverter. Each panel works independently, which suits roofs with several faces or shading at certain times of day. Enphase's UK warranty for its IQ8 microinverters runs for 25 years, with conditions: the product must be registered within a set time and kept connected through the Enphase gateway, so read the terms before you rely on it. The modular design also makes it straightforward to add panels later.
What panel-level control actually gives you
The benefit shows up most where a tree, chimney or neighbouring building shades part of the array. On a single unshaded south-facing roof face, the gap between microinverters and a good string inverter is much smaller. Ask your installer to model your own roof instead of assuming microinverters are automatically stronger.
Fronius: robust build and strong support
Fronius is an Austrian brand known for robust engineering and after-sales support, with both string and hybrid inverters. It tends to sit above the budget end of the market, and you are paying for build quality and support, not for higher energy yield on a straightforward roof. It is worth considering if you want a conventional inverter built to last.
Solis: a hybrid brand often seen in quotes
Solis makes string and hybrid inverters that appear in many UK quotes, offering a balance of features and price. Ask your installer whether it is part of their standard range, which models they use, and how warranty claims are handled in the UK.
Growatt: often positioned at the value end
Growatt hybrid inverters are usually positioned as a value option that still supports battery storage. Compare the standard warranty length and the UK support arrangements with the other brands, since those are the areas where budget and premium options tend to differ most.
Start with your roof
Your roof usually narrows the choice before brand does. A single unshaded roof face often works well with a good string inverter, while several roof faces, chimneys, trees or a neighbour's extension can make panel-level optimisation worthwhile. A proper design should show how many panels go on each face and what shading was assumed, so you can see why a particular inverter was recommended.
What to check before you choose
- Warranty length and who honours it. A long figure on a manufacturer's website is only useful if there is real UK support behind it.
- Battery compatibility. Check the exact inverter and battery pairing, its usable capacity and its charging and discharging efficiency. AC-coupled and DC-coupled designs take different conversion paths; compare the proposed equipment rather than assuming the label alone decides performance. Our home battery size guide shows how storage fits in.
- Monitoring. Every brand offers an app, but the detail varies, so ask to see a live example before you commit.
- Grid-connection compliance. Check that the exact inverter model and system design meet the applicable G98/G99 requirements and your network operator's connection conditions. Installation certification and SEG registration are separate checks.
- Replacement plans. Inverters often need replacing during the life of a solar system, so ask what the installer's support covers and how a replacement would be handled.
Compare the whole quote, not just the inverter
The inverter is one line in a quote. Our guide to what to look for in a solar and battery quote shows how to check the rest, from named equipment to guarantees and payment terms.
Next step
If you would like to know which inverter suits your roof, request a free quote and REST will recommend equipment based on your property, not a generic shortlist. If you already hold a quote from another installer, send it in and REST will review it, subject to assessment and approval.