SunWiz: regional variance in brand leadership for solar PV
Market share leaders in the UK solar & storage sector don’t just dominate nationally—they win by being present everywhere.
New analysis from SunWiz shows that the path to national leadership starts with building strongholds in certain regions, expanding reach across the country, and aligning products with local needs.
Too often, brands focus on national market share percentages alone. But those numbers are only the end result. Behind the scenes, it’s local dynamics—installer preferences, product range, and distribution reach—that drive the trajectory of market share growth or decline.
SunWiz’s regional intelligence exposes these levers, enabling brands to make smarter strategic decisions about where and how to grow.
Three-phase inverters: A clear exmple of regional variation
One striking illustration of regional differences comes from three-phase inverter usage.
Our data shows significant variation across the UK:
In some regions, three-phase inverters make up less than 20% of installations.
In others, they account for over 35%.
Regions with a higher percentage of three-phase inverters often have more commercial and industrial installations, larger-scale solar projects, or rural grid layouts where three-phase connections are standard.
In contrast, regions with a lower percentage typically have denser residential markets or older grid infrastructure where single-phase dominates, leading to fewer three-phase installations overall.
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This example highlights why a regional strategy matters. The technology mix differs by location, shaping what products gain traction and where future opportunities lie.
Regional leaders in iverters
When we break down inverter brands by region, some clear leaders emerge:
Fox ESS consistently ranks first across most regions in England and Wales.
Ginlong/Solis holds top positions in many Scottish regions and parts of Northern Ireland.
Regional dominance like this can come from many factors:
Product-market fit — having the right specifications for local project types.
Distribution strength — working with wholesalers that have regional reach.
Installer relationships — especially where installers specialise in certain technologies.
Another important factor is the association between inverters and batteries, given the UK’s high storage attachment rate. This brings us to energy storage systems.
Regional leaders in ESS
Because batteries are often sold alongside inverters, it’s no surprise that ESS brands show similar regional patterns.
Our data reveals:
Fox ESS leads in many English and Welsh regions, mirroring its inverter dominance.
Dyness ranks strongly in Northern Ireland; Growatt does well in Scotland.
Ginlong/Solis is absent from this list.
Related:The rooftop revolution is just the beginning of the UK’s energy transition
This tight link between inverters and batteries underscores how success in one product category can reinforce success in another.
Regional leaders in modules brands
When we look at the top three module brands by UK region, some interesting patterns emerge. JA Solar dominates most regions, consistently ranking first across nearly all of England, Scotland, Wales, and Northern Ireland. This indicates not only broad installer reach but also a strong distribution network ensuring availability across the country.
Other brands show regional strengths that may reflect local product-market fit or specific distributor relationships.
Aiko takes the top spot in the South West of England and appears frequently as the second-ranked brand elsewhere, suggesting a growing presence and potential to expand further.
DMEGC secures steady third-place rankings across much of the UK, indicating widespread but not dominant adoption.
Brands like Jinko Solar and Longi make occasional appearances, hinting at footholds or holdouts in select regions such as the North East of England and Mid Wales.
Related:UK solar capacity up 5.9% year-on-year
Regional strongholds often serve as launch pads for national growth. A brand might start by dominating in one area—whether through local product alignment, distribution partnerships, or early installer relationships—then expand geographically as awareness and trust build.
Across panels, inverters, and batteries, the data shows that brands win national market share through two key drivers:
Installer Reach — broad geographic coverage through effective distribution strategy.
Installer Depth — providing the right products for installers’ full range of needs, ensuring repeat business.
Brands that achieve both don’t just grow—they sustain and defend their market share over time.