Series Box THS50E
Mandatory Solax accessory for expanding the IES system with a second TP-HS50E battery tower. Allows you to connect two towers in series, reaching up to 20 kWh (X1-IES single-phase) or 30.6 kWh (X3-IES three-phase) of storage. The package includes the Series Box, base for the second tower, power and communication cables. Compatible with Solax X1-IES and X3-IES inverters.
The Solax Series Box THS50E is the mandatory accessory for expanding a Solax IES storage system with a second tower of TP-HS50E battery modules. Without this component, adding a second tower is not technically possible: the Series Box manages communication and energy balancing between the two towers, ensuring the safety and stability of the entire high-voltage (HV) storage system.
What is the Series Box THS50E for?
In the Solax IES (Integrated Energy Storage) system, TP-HS50E battery modules are installed in vertical towers. A single tower allows up to 4 modules (single-phase) or 6 modules (three-phase). To exceed this limit and reach higher storage capacities — up to 20 kWh on X1-IES and up to 30.6 kWh on X3-IES — a second tower must be added. The Series Box THS50E is the physical and electronic link that makes this expansion possible: it coordinates communication between the towers via the Battery Management Unit (BMU) and ensures safe and balanced operation of the entire storage bank.
Package contents
- Series Box (connection and communication module) — dimensions 167 × 91.5 × 121 mm, weight 1.3 kg
- Base for the second tower of battery modules — dimensions 730 × 75 × 150 mm, weight 3.9 kg
- DC power cables for series connection between towers
- Communication cables for connection to the BMU
Technical specifications Series Box THS50E
| Battery compatibility | Solax TP-HS50E (5.1 kWh HV LiFePO₄) |
| Inverter compatibility | Solax X1-IES (single-phase) and X3-IES (three-phase) |
| Function | Connection of second battery tower in series |
| Communication | Via BMU (TBMS-MCS0800E), CAN/RS485 |
| Maximum capacity with 2 towers | 20 kWh (X1-IES) / 30.6 kWh (X3-IES) |
| Series Box dimensions | 167 × 91.5 × 121 mm — 1.3 kg |
| Tower base dimensions | 730 × 75 × 150 mm — 3.9 kg |
| Total weight | 5.2 kg |
| Installation | Floor-mounted, stacked on top of the second tower |
System compatibility and requirements
The Series Box THS50E is mandatory when installing more than 4 TP-HS50E modules on X1-IES (single-phase) systems or more than 6 modules on X3-IES (three-phase) systems. The complete system also requires a Battery Management Unit (BMU) TBMS-MCS0800E or MCS0800E-D for centralized management of the two towers. The Series Box does not function as a standalone component: it must be integrated into the IES configuration as specified by Solax.
Frequently Asked Questions
Is the Series Box THS50E mandatory to add a second battery tower?
Yes, the Series Box THS50E is mandatory to connect a second tower of TP-HS50E modules to the IES system. Without this accessory, it is not possible to physically connect the two towers or ensure safe communication between the modules and the BMU. It is a non-optional component for those who want to exceed the storage capacity of a single tower.
How many kWh of storage do you get with the second tower and the Series Box THS50E?
With the Series Box THS50E and two complete towers of TP-HS50E batteries, the maximum achievable capacity is 20 kWh with X1-IES single-phase inverter (4 modules per tower × 2 towers × 5.1 kWh = 20.4 kWh gross) and up to 30.6 kWh with X3-IES three-phase inverter (6 modules per tower × 2 towers × 5.1 kWh = 30.6 kWh). The usable capacity is slightly lower depending on the configured depth of discharge.
Is the Series Box THS50E compatible with older Solax T-BAT HV systems?
No. The Series Box THS50E is specifically designed for TP-HS50E battery modules and for IES series inverters (X1-IES and X3-IES). It is not compatible with the previous T-BAT-H or T-BAT-5.8 series batteries, nor with G4 hybrid inverters outside the IES range. For systems on the G4 platform, Solax provides different dedicated accessories.
What exactly is included in the Series Box THS50E package?
The package includes the Series Box module (167 × 91.5 × 121 mm, 1.3 kg), the base for the second battery tower (730 × 75 × 150 mm, 3.9 kg), DC power cables, and communication cables for connection to the BMU. The TP-HS50E battery and the BMU are not included and must be purchased separately.
Is a specialized electrician required to install the Series Box THS50E?
Yes. The TP-HS50E system operates at high voltage (80–800 V DC). Installation of the Series Box and connection of the battery towers must be carried out exclusively by a qualified installer with experience in HV storage systems, strictly following the Solax X1-IES / X3-IES installation guide. The product is not intended for DIY installation.
