✔ LiFePO₄ Chemistry — Safe & Long-Lived
Lithium iron phosphate (LiFePO₄) is thermally stable, resistant to thermal runaway, and does not produce oxygen during failure — the safest lithium chemistry for home installation. Combined with the internal fire suppression system, this battery meets the safety requirements for residential installation without specialist fireproofing of the installation space. LFP chemistry also delivers outstanding cycle life: 6,000+ cycles at standard conditions, equivalent to more than 16 years of daily cycling.
✔ IP65 — Indoor or Sheltered Outdoor
The IP65-rated metal enclosure is fully dust-tight and protected against water jets from any direction, making this battery suitable for garages, outbuildings, utility rooms, and sheltered external wall locations. The operating temperature range of –20°C to +60°C covers UK climates year-round without any additional thermal management or enclosure heating.
✔ Supplied Complete — Ready to Install
This listing includes inverter-to-battery power cables, battery-to-battery expansion cables, communication cables, and the 125A MCB isolator — every item needed to connect the battery to a Sunsynk inverter. Many competitor listings supply the battery module only; this bundle eliminates the need to source cables and isolator separately, reducing installation time and the risk of mismatched specifications.
✔ Quick Paralleling — No DIP Switches
The BMS includes automatic ID assignment for parallel configurations — when multiple batteries are connected and powered on, the master battery automatically detects and assigns slave IDs. No DIP switch configuration is required, significantly reducing the risk of wiring errors and simplifying multi-battery commissioning. Up to 8 batteries can be paralleled for a maximum of 42.56 kWh gross storage per system.
✔ 125A MCB Isolator Included
The included 125A MCB provides overcurrent protection and a safe isolation point between the battery and the inverter — a requirement under electrical installation regulations for battery storage systems. Having this component pre-specified and included ensures correct rating for the SUN-BATT-5.32's 100A maximum current capability without the installer having to source and verify the correct breaker rating separately.
✔ Intelligent BMS — Full Cell Protection
The integrated BMS continuously monitors cell voltage, temperature, and current for every cell, providing automatic protection against overcharge, over-discharge, short circuit, and high/low temperature conditions. Active cell balancing extends cycle life by preventing any single cell from becoming the system weak link. The BMS communicates with the Sunsynk inverter via CAN/RS485 for real-time state-of-charge reporting and system coordination.
✔ Sunsynk Connect App Monitoring
When paired with a Sunsynk hybrid inverter, the battery's state of charge, charge/discharge power, and cycle history are reported through the Sunsynk Connect platform and app — accessible from any smartphone. This allows homeowners to monitor battery performance, set charge schedules, configure grid export limits, and track self-consumption in real time without any additional hardware.
✔ Floor or Wall Mounting Flexibility
The SUN-BATT-5.32 supports both wall mounting via included bracket and floor standing, giving installers flexibility in plant rooms, garages, and utility areas. Wall mounting requires a solid masonry or concrete surface rated for the 46.5 kg load. The wall bracket is included in the box; a standard 10mm masonry drill bit is required for installation.
The SUN-BATT-5.32 is compatible with the following Sunsynk hybrid inverter models (firmware must be up to date):
✔ SUNSYNK-3.6K-SG01LP1 (IP65)
✔ SUNSYNK-3.6K-SG02LP1 (IP65)
✔ SUNSYNK-5.5K-SG01LP1 (IP65)
✔ SUNSYNK-8.8K-SG02LP1 (IP65)
✔ SUNSYNK-6K-SG02LP1
✔ SUNSYNK-7.6K-SG02LP1
✔ SUNSYNK-8K-3P-SG02LP1
✔ SUNSYNK-10K-3P-SG02LP1
✔ SUNSYNK-12K-3P-SG02LP1
Always confirm compatibility with your specific inverter firmware version before installation. Contact your distributor if uncertain.
How much usable energy does this battery actually store?
The gross capacity is 5.32 kWh, but the battery is configured to operate at a maximum 80% depth of discharge, leaving a 20% reserve to protect cycle life. This gives approximately 4.26 kWh of usable energy per unit. As a practical guide, 4.26 kWh would power a typical UK home's evening demand for 3–5 hours, or cover overnight baseload (fridge, standby loads, lighting) for 8–10 hours depending on your household consumption. A second battery in parallel doubles this to 8.52 kWh usable.
Why is the UK charge/discharge rate 0.5C when some listings say 1C?
Sunsynk's own product page states that UK-supplied models are 0.5C rated — this is a market-specific configuration, not a fault. At 0.5C, the maximum charge or discharge power is approximately 2.66 kW per battery unit (50A × 53.2V). Some international listings and older data sheets state 1C (5.32 kW), but this does not apply to batteries supplied for the UK market. This limit means that to achieve, for example, 5 kW of battery discharge power, you would need two batteries in parallel. This is an important consideration when sizing a system against peak household load.
Can this battery be used with inverters other than Sunsynk?
The SUN-BATT-5.32 communicates via CAN/RS485 using the Sunsynk protocol. Sunsynk states it is compatible with major PCS brands, and some third-party inverters can communicate with it via RS485 using a compatible BMS protocol — Solis and some other brands have been reported as working. However, full functionality, accurate SoC reporting, and warranty support are only guaranteed with Sunsynk hybrid inverters. If you have a non-Sunsynk inverter, confirm compatibility with your inverter manufacturer or installer before purchasing.
What cable size should be used for battery connections?
Sunsynk specifies a minimum of 25mm² EV-rated cable (600V, 125A rated) of at least 1,500mm length for power connections between parallel batteries. For the connection between the battery or battery bank and the inverter (P+ and P-), when multiple batteries are in parallel, a minimum 50mm² cable rated for 210A is required to handle the combined current. All parallel cable runs should be the same length to ensure equal current sharing between batteries. The cables included in this listing cover the standard single-battery-to-inverter connection; a qualified installer will confirm correct sizing for multi-battery configurations.
