Batteries for photovoltaics SolaX HS51
SolaX HS51 is a high voltage battery range from SolaX. This category lists 3 SolaX HS51 products with a usable capacity of 5.1 kWh. Guide
Suitable for: Home battery storage.
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SolaX HS51 at a glance
SolaX HS51 is aimed at family houses and small businesses: it stores the daytime solar surplus for the evening and the night. The battery management system talks to the inverter over RS485, CAN, so the inverter must list SolaX HS51 as an approved battery before you order.
Protection ratings in this range: IP66. Units rated IP54 or higher can be mounted outdoors within the temperature limits in the datasheet. The range includes separate battery modules and control units, so a system can start at the minimum configuration and grow later within the stack limits that SolaX specifies.
Tip from practice
High voltage stacks are matched to the inverter by module count. Check the minimum and maximum number of modules your inverter model accepts before you fix the capacity, because that range decides which configurations will work.
How to choose a SolaX HS51 configuration
The table lists every SolaX HS51 product in this category with the key figures we hold for it. Choose in this order: inverter compatibility first, then usable capacity against evening and night consumption, then power and siting.
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SolaX HS51 products compared
| Product | Usable capacity | Communication | IP rating |
|---|---|---|---|
| SolaX HS51 Connection Box (2 rows) | - | RS485, CAN | IP66 |
| SolaX TBMS-S51-8 HV BMS + Base (HS51) | - | RS485, CAN | IP66 |
| SolaX TSYS-HS51 5.1kWh Stackable HV Battery (LFP) | 5.1 kWh | RS485, CAN | IP66 |
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Frequently asked questions about SolaX HS51
What usable capacity does SolaX HS51 offer?
The SolaX HS51 products listed here offer 5.1 kWh of usable capacity, and the modular design lets you add capacity later. Compare usable capacity rather than nominal capacity when you size the system.
Is SolaX HS51 a low voltage or a high voltage battery?
SolaX HS51 is a high voltage battery. It needs an inverter with a high voltage battery input and does not work on a 48 V input.
Which inverters work with SolaX HS51?
Any inverter that lists SolaX HS51 on its approved battery list. The battery communicates over RS485, CAN. Matching the voltage is not enough on its own, because the inverter and the battery management system must use the same protocol and firmware.
Can a SolaX HS51 system be expanded later?
Yes. Additional modules can be added within the maximum stack size that SolaX allows. Keep new modules in the same product family and firmware generation, and expand while the existing pack is still relatively new.
Can SolaX HS51 be installed outdoors?
Units rated IP54 or higher can be installed outdoors within the temperature range in the datasheet. The ratings in this range are IP66.
What is SolaX HS51 used for?
Mainly for family houses and small businesses. It stores the daytime solar surplus for the evening and the night and, with a suitable hybrid inverter, can also supply backup circuits during a grid outage.
Where can I buy SolaX HS51 batteries?
ONSA Plus supplies SolaX HS51 to installers and resellers across Europe. This category lists 3 SolaX HS51 products with current prices and availability, and there is no minimum order.
Usable capacity, backup behaviour and inverter compatibility depend on the specific inverter model, the wiring of the installation and the manufacturer's approved combination list.
About ONSA Plus
Why installers across Europe buy storage from us
ONSA Plus is a European B2B distributor of photovoltaics, battery storage, heat pumps and EV charging stations. In our own EU warehouses we keep over 1,500 products from 25+ brands, including Huawei, Solis, SolaX and Dyness.
We are not just a trading company. We design and service energy systems ourselves, so we answer questions on battery sizing, inverter pairing and backup wiring from engineering practice, not from a catalogue. There is no minimum order, so you buy what the job needs.
