Deye AI-W5.1-B5.12kWh 51.2V stackable LiFePO4 battery module, IP65

Overview

AI-W5.1-B is a single 5.12kWh module (100Ah at 51.2V) for building a Deye AI-W battery stack, either under a PDU1 for an external low-voltage inverter or under a PDU3 with a matching Deye hybrid inverter on top. One module delivers 2.5kW rated DC power and 100A, with 150A for 10 seconds; usable energy is 4.6kWh at the recommended 90% depth of discharge. The 53kg module measures 720×254×300mm, and from two to six modules form stacks of 10.24 to 30.72kWh.

• 5.12kWh, 100Ah, 51.2V LiFePO4 per module
• 1 to 6 modules per stack, 6 stacks in parallel
• Cable-free stacking through quick connectors
• IP65 after stacking, indoor or outdoor
• Charging from -20°C on versions with heating
• 10-year warranty, 16MWh throughput per module

How it works

AI-W5.1-B is the battery module of Deye's AI-W (SPRING) residential storage range. Each module holds 100Ah of lithium iron phosphate cells at 51.2V and has its own BMS, circuit breaker and air vent valve. Modules are stacked on a base and joined by quick connectors guided by pillars, so no cables run between them. A power distribution unit sits on top of the stack and connects it to the inverter.

Deye offers two PDUs for the same module. AI-W5.1-PDU1-B links the stack to an external low-voltage inverter through bolted battery outputs and a CAN/RS485 PCS port. AI-W5.1-PDU3-B carries a matching Deye hybrid inverter on top of the stack, forming the all-in-one AI-W5.1-B-ESS of 3.6–10kW single-phase or 5–12kW three-phase.

Key features

One cluster takes one to six modules, from 5.12 to 30.72kWh. Charge and discharge current grows with the stack: 100A for one module, 200A for two and 250A from three modules, with 10-second peaks of 150A, 270A and 360A. Deye recommends 90% depth of discharge and rates the cells for at least 6000 cycles at 0.5C to 70% end of life, with 16MWh throughput per module and a 10-year warranty. Up to six clusters (36 modules) can run in parallel.

Installation and compatibility

The stack is floor-mounted and reaches IP65 once assembled, so it can stand indoors or outdoors, preferably away from direct sun, rain and snow. Deye's quick guide draws the required clearances, mostly 300mm or more, and a 10–35mm gap at the wall; side brackets and M6 expansion bolts tie the stack to the wall, and adjustable feet on the base level it. Charging needs 0–55°C, or down to -20°C on modules with heating film, identified by the serial number prefix.

Monitoring and settings

Module addresses are assigned automatically, and battery data reach the inverter over CAN 2.0 or RS485 through the PDU. Each module shows run, alarm and error LEDs, while the PDU adds five state-of-charge LEDs. With a Deye inverter set to lithium mode the packs can be checked on the inverter display, and Deye states that remote monitoring and firmware upgrades are supported. Installers can also read every module on a PC through the upper-computer software.

Questions and answers