Hoymiles HiBattery HB-4020-S LiFePO4 Expansion Battery 4kWh

The Hoymiles HB-4020-S (MPN: HB-4020-S) is a high-performance LiFePO4 expansion battery with a 4 kWh capacity, designed to flexibly expand your Hoymiles HiBattery system. This module is designed exclusively as an additional battery for the HB-4020-X base module and cannot be operated independently. Ideal for anyone who wants to scale their storage solution easily and safely.

Highlights of the HB-4020-S expansion battery

• Flexible capacity expansion: 4 kWh LiFePO4 battery, stackable and combinable for up to 16 kWh total capacity.
• Maximum safety: 314 Ah LiFePO4 cells with over 8,000 charge and discharge cycles, 48 integrated protection functions, aerosol fire suppression, pressure relief valve, over-temperature protection, self-heating for low temperatures, IP66 protection rating.
• Low-maintenance & durable: Intelligent cell balancing extends service life, DC/DC balancing at the battery level, natural convection (fanless, <20 dB).
• Plug-and-play expansion: Easy connection to the existing HB-4020-X system—no additional controller or complex installation required.

Easy expansion for your HiBattery system

The HB-4020-S connects directly to the HB-4020-X base module. Installation is straightforward via plug-and-play. The system grows step by step with your energy needs—up to three expansion batteries are possible.

Maximum safety and compatibility

The Hoymiles BMS integrates 48 safety features, including intelligent self-heating, aerosol fire suppression, a pressure relief valve, and over-temperature protection for the DC connections. The battery is IP66-rated for water and dust resistance, and intelligent cell balancing ensures a long service life.

Quiet, maintenance-free, and robust

Thanks to natural convection, the battery operates fanless and virtually silently (<20 dB). The robust construction and self-heating ensure safe operation even at sub-zero temperatures or high humidity.

What sets the system apart in everyday use?

With the HB-4020-S expansion battery, you can flexibly and future-proofly expand your energy storage system—for greater independence and optimal use of your PV system. The battery is low-maintenance, safe, and easy to install.

Technical Specifications

Battery

• Battery type: LiFePO4 (LFP)
• Rated energy: 4,020 Wh
• Rated capacity: 314 Ah
• Nominal voltage: 12.8 V
• Voltage range: 11.2–14.6 V
• Cycle life: ≥ 8,000 (at 70% SOH)
• Max. charge/discharge power: 2,000 W
• Charge/discharge temperature: –20°C to +55°C (with self-heating)

General

• Dimensions: 520 × 275 × 199 mm
• Weight: 35 kg
• Cooling: Natural convection (fanless, <20 dB)
• Protection class: IP66

Included

1× Hoymiles HiBattery HB-4020-S LiFePO4 extension battery 4 kWh