SolaX BMS Parallel Box II — Storage up to 46 kWh
SolaX BMS Parallel Box II: connects two Triple Power T-BAT HV11550 battery strings in parallel, taking storage up to 46 kWh, with integrated BMS.
No master module required: the strings take only slave modules. Strings managed independently, 35 A maximum current, 6,000 cycles at 90% DoD. For SolaX X1-Hybrid and X3-Hybrid inverters.
The SolaX BMS Parallel Box II is the device that connects two Triple Power battery strings in parallel, taking a system's storage up to 46 kWh. It integrates the Battery Management System inside the box, and this changes the shopping list more than it seems.
The BMS is in the box: you only buy slave modules
In the traditional architecture, each battery tower requires a master module — the one that holds the BMS, talks to the inverter and costs noticeably more than a slave. With the BMS Parallel Box II the management logic is in the box: the two strings take only slave T-BAT HV11550 modules, with no dedicated masters.
On a 46 kWh system that means saving the premium of two master modules, simplifying the communication wiring and having a single point of management instead of two systems that must coordinate. It is the main reason this accessory exists.
It doubles energy, not power
This is the figure to be clear about upfront, because it drives the design. Capacity rises to 46 kWh, but the maximum charge and discharge current stays at 35 A: the box is the passage point for both strings, and that limit does not add up. In practice you gain autonomy — how many hours the home can run on storage — not instantaneous power, that is how many kilowatts can be drawn at once.
Whoever needs more discharge power must act on the inverter size, not the battery capacity. Whoever needs to get through a whole night or an entire cloudy weekend is exactly the target for this product.
Two independent strings: the redundancy is real
The two strings are managed separately by the BMS. If a module in one string faults, that string is isolated and the other keeps working: the system does not stop, it loses half its capacity. On a storage system that also serves as backup, this is a substantial difference from a single tower, where the failure of one module takes the whole bank offline.
Alternating use of the two banks also spreads the cycles across more cells, extending the overall life of the system compared with a single string pushed to the limit every day.
BMS Parallel Box II technical specifications
| Function | Parallel connection of 2 high-voltage battery strings |
| BMS | Integrated in the box, no master module required |
| Maximum system capacity | 46 kWh (2 strings of 23 kWh) |
| Modules per string | Up to 4 T-BAT HV11550 |
| Max charge/discharge current | 35 A total |
| Cycle life | 6,000 at 90% depth of discharge |
| Compatible batteries | SolaX Triple Power T-BAT HV11550 |
| Compatible inverters | SolaX X1-Hybrid and X3-Hybrid |
| Dimensions | 368 × 310 × 140 mm |
| Weight | 5.2 kg |
Grid-connection compliance is a practical matter, not a label
The system is declared compliant with the applicable low- and medium-voltage grid-connection standards. This is not a decorative badge: it is the documentation the distribution network operator requires to authorise the connection and that is needed in the paperwork with the grid authority. A storage component without an up-to-date declaration of conformity stalls the authorisation even when it works perfectly. Check the standards and editions accepted by your local network operator.
What it does in everyday life
Forty-six kilowatt-hours is the size for a villa with a heat pump and an electric car, an agritourism business or a small activity with significant evening consumption. With that capacity you comfortably get through a whole night powering heating, lighting and appliances, and reach the morning with margin even after an overcast day. Always remembering the 35 A limit: the autonomy is long, but the simultaneous loads remain those the inverter can serve.
Frequently asked questions
Do I still need a master battery?
No, and that is the main advantage. The BMS is integrated in the box, so the two strings take only slave T-BAT HV11550 modules. You save the premium of the master modules and simplify the communication wiring.
How many batteries can I connect in total?
Two independent strings, each up to 4 T-BAT HV11550 modules, for a maximum of 23 kWh per string and 46 kWh total. The strings must be made up of modules of the same generation: check the complete code of the modules already installed before expanding.
Which inverters does it work with?
With SolaX X1-Hybrid and X3-Hybrid inverters. It is designed exclusively for SolaX Triple Power high-voltage batteries and is not compatible with low-voltage storage or other manufacturers. Before purchase, also check the inverter firmware version.
If one string fails, do I lose all the storage?
No. The two strings are managed independently: in case of a module fault, that string is isolated and the other keeps working. You lose half the capacity, not the whole system.
With 46 kWh can I power more loads at the same time?
No, and it is worth repeating. The instantaneous power available depends on the inverter and on the box's 35 A limit, not on the battery capacity. Doubling the kWh doubles the duration of the autonomy, not the number of appliances you can run together.
