FoxESS EP5 5.18kWh high-voltage battery5.18kWh 192V LiFePO4 battery with integrated BMS

Overview

The EP5 is the 192V, 27Ah member of FoxESS's first-generation EP range: a single IP65 box of 380×625×147mm and 50.5kg holding 5.18kWh of lithium iron phosphate cells, a BMS and a DC switch. It delivers up to 27A continuously, 65A for 60 seconds, and FoxESS rates it for at least 4000 cycles at 90% DoD. Up to four EP5 can be paralleled for 20.72kWh. FoxESS's CEI 0-21 documents for Italy list it with H3 Smart and H3-Pro inverters.

• 192V (5–6kWh) or 384V (10–12kWh) single-box batteries
• Integrated BMS, CAN link to the inverter
• Up to four units in parallel via junction box
• IP65 enclosure for indoor or outdoor mounting
• Built-in aerosol fire-suppression device
• Optional warm-up versions charge down to -25°C

How it works

Each EP battery is a complete high-voltage pack: lithium iron phosphate cells, a battery management system and a DC switch share one enclosure, so no separate control unit is needed. The 192V models (EP5, EP6, EK6) and the 384V models (EP11, EP12 Plus) connect directly to the battery port of a FoxESS hybrid inverter and report state of charge and alarms over CAN.

For more capacity, up to four identical units are paralleled. The first battery becomes the main unit, the others are chained with LINK IN/LINK OUT cables, and each battery's DC cable runs to an HV junction box, sold separately, whose output feeds the inverter. Different battery types must not be mixed in one system.

Key features

Depth of discharge is 90% and FoxESS quotes at least 95% round-trip efficiency at 25°C. Standard versions charge from 0°C and discharge from -10°C, up to +55°C; warm-up versions, marked (w) in the manuals, heat the cells from the battery or the inverter and extend both limits to -25°C. A thermal aerosol extinguisher inside each pack is designed to activate if thermal runaway is detected. Five LEDs show state of charge and fault codes.

Installation and compatibility

The packs mount on a wall bracket or stand on the floor, must not be tilted or laid flat, and need at least 300mm of free space around them. FoxESS asks for an indoor room of at least 17m² for EP Plus models, at least 2m from heat sources, and advises against outdoor sites within 1000m of the coast. Power cables must leave the terminals straight for at least 80mm before bending.

FoxESS lists these batteries in its Italian CEI 0-21 documentation for the H3 Smart and H3-Pro hybrid inverters: EP5, EP6 Plus, EP11 and EP12 Plus appear on the TÜV certificate for H3 Smart, and EP5 and EP11 on the declarations for H3-Pro. Check the inverter's battery voltage window before combining models.

Monitoring and settings

After commissioning, the inverter reads the battery over CAN and passes data to the FoxCloud app and web portal, where warm-up switch, start and stop temperatures and time windows can be set. A black-start sequence on the power button lets the system restart with neither grid nor PV. FoxESS recommends a full SOC calibration, charging until charge power reaches zero, about every two weeks.

Questions and answers