EG4 WallMount 314Ah Indoor Battery, 48V 16kWh LiFePO4, Self-Heating, 200A Continuous, Expands to 32 Units, UL 1973 & UL 9540

About the EG4 WallMount 314Ah Indoor Battery

Sixteen kilowatt-hours in one cabinet means fewer batteries to hang, wire and manage. This EG4 16kWh battery mounts on a garage, shed or utility room wall, delivers 200A (10.2kW) continuous, and covers short surges up to 12.8kW. A built-in heater keeps it ready to charge through cold snaps, and the third-generation BMS sets itself up with your inverter, so commissioning takes a cable and a power-on sequence instead of DIP switches and protocol menus.

Start with one battery and add more as your loads or solar array grow. EG4 supports up to 32 in one bank, and each new battery picks up its ID automatically when it joins.

16kWh Nominal, 12.86kWh Usable: Sizing an EG4 Home Battery Bank

The 16kWh rating is nominal (51.2V × 314Ah). EG4 recommends running the battery to 80% depth of discharge, which gives you 12.86kWh of usable energy per battery and is the basis for its 10,000-cycle rating. Plan your bank around the usable number: two batteries give you about 25.7kWh to work with, and three give you about 38.6kWh.

For continuous loads, EG4 recommends 157A per battery and allows up to 200A. One battery handles 8kW of continuous charging and 10.2kW of continuous discharge, so if your inverter's output or a heavy load like a well pump or welder runs past that, add a battery and let the bank share the current. Our team is happy to help with sizing.

EG4 Battery Compatibility with FlexBOSS, 18kPV and Victron Inverters

The battery talks to the inverter over CAN or RS485 and runs closed loop with EG4's hybrid and off-grid inverters. With a FlexBOSS21, for example, the first battery cabled to the inverter takes ID 1 as the primary, and every follower numbers itself from there.

Victron systems connect over CAN, and EG4's manual lists the other inverter brands it supports on each port. The included Wi-Fi/Bluetooth antenna links the battery to EG4's monitoring platform, which also delivers remote firmware updates.

UL 9540 Listings and Where You Can Install It

The battery carries UL 1973 and UL 9540A at the battery level. At the system level, it holds a UL 9540 listing on its own as a DC energy storage system with one to six batteries, plus a second UL 9540 listing with one to six batteries paired with one to three FlexBOSS21 or FlexBOSS18 inverters. Both certificates are in the downloads below, ready for your AHJ (Authority Having Jurisdiction) at permit review.

EG4 rates the battery for indoor use in attached or detached garages, sheds, enclosed utility closets, basements and utility spaces, and keeps it out of living spaces and marine environments. Its manual calls for at least 4 in between batteries and 23.6 in (600 mm) of clearance from exposures and egress points. For an outside wall, the WallMount 314Ah All Weather Battery is the outdoor-rated version.

Self-Heating for Cold Garages and Sheds

LiFePO4 cells only accept a charge above 32°F (0°C), which matters in an unheated garage. This battery carries its own 448W heater that switches on when its internal temperature drops to 32°F and off at 37°F (3°C), so the bank is ready to charge on cold mornings. It discharges down to -4°F (-20°C) and charges from 32 to 122°F (0 to 50°C).

Wall or Floor Mounting, Wiring and the Conduit Box

At 293 lbs (133 kg), EG4 calls for a team lift, and the two included M10 eye bolts let you raise the battery with an equipment lift. The wall bracket anchors with six fasteners, and the pre-installed feet carry part of the weight to the floor so the wall never holds it all. Floor mounting works too, in a spot where drainage keeps water away.

Each battery ships with two sets of 2/0 AWG Degson power cables (39.4 in), a communication cable and terminating resistors. Each polarity has four Degson quick connectors plus a stud terminal, and the stud takes a lugged cable when the included ones don't reach. Build those runs to length with our custom battery cables, sized from an NEC ampacity chart.

Up to six batteries share the internal busbars. Past six, EG4 calls for an external fused positive busbar and unfused negative busbar, each rated for at least 200A per battery, with fuses no larger than 250A. Each battery also has its own built-in 250A breaker.

To finish the install, the EG4 Indoor Buildable Conduit Box bolts to the top of the battery and encloses the power, communication and ground wiring running up to the inverter. The included X-bracket positions an 18kPV, 12kPV, FlexBOSS18 or FlexBOSS21 above the battery, and the dry-contact port accepts an optional ESS shutdown button that turns off every battery and inverter at once.