BYD · 2.56kWh modules
BYD Battery-Box Premium HVS
A widely-installed modular high-voltage battery that stacks from 5.1kWh to ~22kWh, paired with a third-party hybrid inverter.
B4.3 ~£4,500
Specs & review
Best Modular Battery Storage (2026)
The modular battery storage we would buy this year, ranked on how well they perform, what they cost and how well they hold up.
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Fox ESS · ECS2900
Fox ESS ECS Cube
Stackable high-voltage battery modules letting you size storage from ~2.9kWh up to ~16kWh.
B4.2 ~£1,850
Specs & review
SolaX Power · 5.8kWh modules
SolaX Triple Power T58
High-voltage modular battery that stacks to ~46kWh and integrates tightly with SolaX hybrid inverters for a single-vendor system.
B4.2 ~£3,500
Specs & review
Pylontech · US5000
Pylontech US5000
Popular 4.8kWh LFP module designed to stack (up to ~16 units) for low-voltage hybrid inverter systems.
B4.1 ~£1,150
Specs & review
Duracell · PD-16KWH-50V-1G
Duracell Dura16
A 16kWh low-voltage battery built by Puredrive Energy under the Duracell name, with 14.4kWh usable and an 8,000-cycle rating, sold to pair with Duracell's own inverter.
B4.1 ~£3,348
Specs & review