Cleantech company Allume Energy has launched SolShare 2, the latest version of its shared solar technology designed to connect a single rooftop solar PV system directly to multiple flats.
Available to UK installers from August 2026, the updated device introduces increased capacity, expanded battery integration capabilities, and installation improvements aimed at apartment blocks and multi-occupancy residential developments.
The technology is designed for both retrofit and new-build projects, enabling multiple dwellings to share electricity generated from a single rooftop solar array without requiring an inverter in each individual property.
SolShare 2 supports up to 15 connections and increases system capacity from 20kW to 30kW, providing additional flexibility for larger installations.
According to Allume, more than 10,000 homes globally have used SolShare technology since its introduction, with UK deployments dating back to 2021.
Battery integration and apartment buildings
A key feature of SolShare 2 is support for communal battery storage systems, which can be installed in dedicated plant rooms or external locations rather than within individual flats.
The company says this approach addresses practical and regulatory challenges associated with installing batteries inside residential apartments.
The updated platform connects to battery storage via ethernet and is designed to work with a range of solar PV and battery technologies. The system also enables residents to export electricity to the grid, while grid-charging functionality is expected to be added in the future.
According to Allume, a recent solar and battery installation serving 24 flats in Cardiff reduced grid energy consumption by between 60% and 70%.
Cameron Knox, CEO and co-founder of Allume Energy, says, “Coming from Australia, with one in three of our homes having rooftop solar, we’ve seen how powerful it can be when you combine solar with battery storage.
“Even with volatile global energy prices, power bills are set to fall in parts of Australia this year thanks to a record number of batteries being added to the grid.
“Until now, compliance and regulations have made it all but impossible to install these integrated solar and battery systems in flats, but SolShare 2 changes that.
“The system responds to the feedback we’ve had from installers across the UK, which has seen our teams comprehensively redesign the hardware, making the systems even easier and faster to install.
“Combined with the Government’s ambitious targets and funding into green energy, the update opens the doors to flats to benefit from solar and batteries. We’re excited to be playing a part in brightening up Britain’s energy mix.”
Projects demonstrate shared solar approach
At Odet Court in Cardiff, Wales & West Housing installed the technology as part of a solar and battery project serving residents in a multi-occupancy building.
Joanna Davoile, Executive Director (Assets) at Wales & West Housing, says, “The SolShare system seems to be a much fairer solution as the energy generated by the building can be shared equally to help our residents keep their electricity costs down rather than going back to the grid.”
A separate project at Scott Court in Dundee saw Hillcrest and Allume Energy install shared solar arrays using ECO4 funding to improve EPC ratings and reduce tenants’ energy bills.
David Conway, Head of Asset Management at Hillcrest, notes, “This project stands as a shining example of what can be achieved through innovation, perseverance, and partnership.
“At Hillcrest Homes, we are incredibly proud to have been part of a project that not only overcame significant planning and architectural challenges but also delivered life-changing benefits to our tenants.
“The installation has helped bring modern energy efficiency to a historic, listed building.
“Many of our tenants at Scott Court have already reported noticeable savings on their energy costs, with some saying they’re topping up their pre-payment meters far less frequently. This is a real and tangible step forward in our mission to tackle fuel poverty.”
The housing association says it is exploring opportunities to deploy similar systems across its wider housing portfolio following the project.
