Home Energy Storage Batteries

Add the loads that will run at the same time during an outage. For example, a 2kW average load needed for 4 hours requires 8kWh before losses. At 90% system efficiency and 80% usable depth of discharge, the estimated nominal capacity is 8 ÷ 0.9 ÷ 0.8 ≈ 11.1kWh. Then check startup peaks from equipment such as air conditioners and pumps. This is an initial estimate; final sizing must use the actual load profile.

EF51100W-L and EF51200W-L are wall-mounted models, while EF51314W-L is a floor-mounted model with casters. For the wall-mounted models, verify wall loading and fixing points. For EF51314W-L, verify footprint, access, floor loading, and caster locking or anchoring requirements.

Voltage alone is not enough. Provide the inverter brand, full model number and battery-compatibility information from its manual. Check the DC voltage window, maximum charge and discharge current, CAN/RS485 protocol, communication-cable pinout, parallel logic and approved-battery list. If the protocol or pinout differs, a same-voltage system may still fail to start, limit current correctly or report state of charge.

Only when the specific model and BMS explicitly support it. Before ordering, confirm the maximum parallel count, communication-address settings, busbar and breaker ratings, and equal-length cable requirements. A later addition also requires matching the model, capacity, firmware, state of charge and aging condition. Do not mix different models, capacities, or new and aged batteries on your own, and do not connect them in series without confirmation.

Please provide the inverter brand and full model, continuous and startup power of critical loads, target backup time, PV capacity, expected daily cycles, installation photos and available dimensions, indoor or outdoor conditions and temperature range, communication requirements, expected quantity, destination market and certification requirements. With incomplete data, only a preliminary capacity suggestion is possible; final compatibility cannot be confirmed.