SolaX HS51O Series Box – Battery Expansion Interface Structured battery expansion and scalable system design with the SolaX HS51O Series Box. This Series Box is used within the SolaX TSYS-HS51 high-voltage battery system to enable two-tower configurations when installing larger quantities of HS51 / HS51O battery modules. The Series Box works alongside the HS51O BMU to support safe and organised expansion beyond a single battery tower, helping maintain stable system wiring and reliable communication in higher-capacity installations. Important: A Series Box is only required when installing 9 or more battery modules (i.e. more than 8), where a second battery tower is used. Included in Kit 1x SolaX HS51O Series Box Building a larger system? The Series Box is installed together with a compatible HS51O BMU and HS51 / HS51O battery modules to enable multi-tower system expansion. Battery Configuration & System Requirements (Important) Single battery tower: Up to 8 HS51 / HS51O battery modules may be installed in one tower (manufacturer guidance). Two-tower configuration: When the total number of battery modules reaches 9 or more, a Series Box is required to connect two towers. In two-tower systems, a configuration of 7 6 battery modules is commonly recommended (manufacturer guidance). If installing more than 6 battery modules in a single tower, appropriate lifting equipment or safe access methods should be used during installation. The Series Box works in conjunction with: HS51O BMU (Battery Management Unit) HS51 / HS51O battery modules Compatible SolaX inverter Final system limits remain inverter- and application-dependent. If you are unsure whether your system requires a Series Box, please contact us before ordering. Key Features of the SolaX HS51O Series Box Required for 9 battery module installations (two-tower configuration) Enables scalable HV battery expansion beyond a single tower Supports structured wiring and system organisation Designed to operate alongside the HS51O BMU High-voltage system integration component for larger installations Robust enclosure for long-term reliability Compatibility Designed for use with SolaX HS51 and HS51O high-voltage battery modules Used alongside a compatible SolaX HS51O BMU Supports mixed HS51 / HS51O battery stacks (optimiser function disabled when mixed) Frequently Asked Questions What is the SolaX HS51O Series Box? The Series Box is an expansion and interface component used in larger SolaX HS51 battery systems to support two-tower configurations when installing higher numbers of battery modules. When do I need a Series Box? A Series Box is required when installing 9 or more battery modules (more than 8), where a second battery tower is used. Smaller systems with a single tower do not require a Series Box. Does the Series Box replace the BMU? No. The Series Box works alongside the HS51O BMU. A BMU is still required for system control and communication. Model: TB-HS51O Learn More: https://www.solaxpower.com/products/tsys-hs51.html Downloads Datasheet – SolaX TSYS-HS51 / HS51O Installation Guide User Manual Order the SolaX HS51O Series Box today from The Eco Supermarket for fast UK delivery, expert technical support and full manufacturer warranty. SKU: TB-HS51O-SB Categories: All Products, Batteries, Energy Storage, SolaX Power
