SolarEdge BAT-05K48 (single module)

The direct connection on the DC side with SolarEdge Home Hub/StorEdge inverters eliminates the need for a double AC↔DC conversion, achieving a peak round-trip efficiency of >94.5% according to the manufacturer's datasheet (BAT-05K48). Typical AC-coupled systems from competitors achieve 88-92%, which translates into measurable savings over a year with a high self-consumption rate.

The LiFePO4 chemistry provides thermal stability (no risk of thermal runaway) and a 10-year warranty with a capacity retention of ≥70% after an unlimited number of cycles (without a counter, such as in BYD Battery Box HVM with a limit of approximately 6,000 cycles or energy of MWh). The user can charge and discharge the battery daily without incurring any contractual penalties.

A single module provides a usable capacity of 4.6 kWh; up to 5 modules (approximately 23 kWh total) can be connected to a single inverter without requiring an inverter replacement. Starting in January 2025, modules connected to new Home Hub Three Phase installations will have an increased capacity of 4.85 kWh, which improves the cost-effectiveness of expanding existing installations.

A single module offers a continuous discharge power of 4,096 W, while multi-module configurations provide a continuous power of 5,000 W (for both charging and discharging). This is sufficient to power typical household appliances in a backup mode without the need to purchase a separate isolated inverter.

The battery operates natively within the mySolarEdge ecosystem - data from the PV system, battery, and grid are visible in a single application without the need for integration via third-party protocols (Modbus TCP, CAN). This simplifies maintenance and diagnostics compared to solutions from different manufacturers.

The battery is compatible exclusively with SolarEdge Home Hub / StorEdge Three Phase inverters. Replacing the inverter with a different brand or switching to a hybrid inverter from another manufacturer requires replacing the entire energy storage system, which significantly increases the investment risk over a 10-year lifespan.

Backup power is not available out-of-the-box and requires the purchase and installation of a separate SolarEdge Home Backup Interface. This results in additional hardware and installation costs compared to competitors (e.g., Huawei LUNA2000 with a built-in backup function in the SUN2000 hybrid inverter).

Module 4.6 kWh at a price of approximately €1,824 (ONSA Plus, May 2025) results in an average user cost of approximately €396/kWh. The BYD Battery Box Premium HVM offers a comparable LFP capacity in the range of €300-€350/kWh, which represents a SolarEdge premium of 13-32%. For installations that do not require the SolarEdge ecosystem, this premium may be difficult to justify.