SolaX Triple Power 5.8kWh TP58 Slave Battery V3

SolaX Triple Power 5.8kWh TP58 Slave Battery V3

The SolaX Triple Power 5.8kWh TP58 Slave Battery V3 is the expansion battery for the TP58 high-voltage storage range. Also listed as HV11550(H) V3, this battery is used to add capacity to a compatible TP58 system that already includes a master battery. It is not a starter battery and cannot operate on its own.

That is the key buying point here. A lot of modular batteries share the same capacity and overall appearance, but that does not mean they perform the same role. The TP58 Slave Battery V3 is designed purely for expansion. If the system needs the first battery in the stack, the correct product is the TP58 Master battery instead.

What the TP58 Slave V3 is used for

The TP58 Slave V3 is used to increase storage capacity within a compatible SolaX TP58 battery system. Each battery adds another 5.8kWh nominal capacity, making it a practical choice for customers who want to build storage gradually rather than oversizing the system from day one.

It is well suited to homes and projects where energy usage has grown, where more solar needs to be captured during the day, or where greater stored energy is wanted for evening use. It can also be useful on upgrade projects where a current or existing TP58 master battery is already part of the system design.

Main features

• 5.8kWh nominal battery capacity
• Expansion battery for TP58 systems
• LiFePO₄ battery chemistry
• 95% depth of discharge
• Over 6000 cycles
• IP66 rated enclosure
• Built-in battery heating
• Wall or floor mounting

Each TP58 Slave V3 adds 5.8kWh nominal capacity to the system, giving customers a clear and modular way to grow storage. That can make planning easier because extra battery capacity can be added in measured steps rather than through a full redesign.

SolaX product information for the V3 range also states 95% depth of discharge. In practical terms, that helps make more of the installed battery energy usable in normal operation, which is important for customers focused on self-consumption and reducing grid reliance.

LiFePO₄ chemistry and a cycle life above 6000 cycles make the battery suitable for regular daily use. For most domestic battery systems, that is exactly what matters: reliable repeated charging and discharging over the long term.

The V3 generation also includes IP66 protection and built-in heating, which gives it a stronger specification for real-world installation conditions. For UK projects in particular, that can be a useful advantage where the battery may be exposed to cooler temperatures or less sheltered environments, subject to correct installation guidance.

Installation and compatibility

The most important point before ordering is that a TP58 Slave Battery V3 cannot be used on its own. A TP58 Master battery is required in the system. This should always be clear on quotations and product selection so the wrong battery role is not ordered by mistake.

The battery can be wall mounted or floor mounted, which helps installers work around different property layouts. As with any battery product of this size, handling, mounting support and cable routing still need to be planned properly.

Channel guidance also states that TP58 V3 batteries are compatible with TP58 master batteries in both V2 and V3 form for certain replacement and expansion projects. That can be helpful where an existing installation is being upgraded in stages rather than replaced entirely.

There is also a relevant compatibility note in reseller technical material stating that TP58 V3 batteries are not compatible with the current SolaX BMS Parallel Box G2, so larger parallel battery designs should always be checked carefully before ordering.

Why buy the TP58 Slave Battery V3 from Evergy

At Evergy, we know that expansion batteries need clear role and compatibility guidance so customers can buy with confidence. The TP58 Slave Battery V3 is a sensible option for adding more storage within the SolaX TP58 platform without moving to a different battery family.

It is a strong fit for customers who already have, or are buying, a TP58 Master battery and want to increase storage with a matching module that keeps the same platform, same chemistry and the same overall system logic.

Related ranges

You can also browse our wider solar batteries range or view more SolaX products to compare compatible storage options.

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