When selecting all‑in‑one battery‑inverter storage, do not focus merely on nominal capacity. Mainstream specs are 5kWh, 10kWh, 16kWh, 20kWh. Prioritize usable capacity and continuous output power to avoid overload with high‑power appliances. Choose Grade‑A LiFePO4 cells and check cycle life and BMS protection. Select IP54 or higher for outdoor use, and confirm on‑grid / off‑grid / hybrid mode support. Merits include easy installation and unified after‑sales for households, small businesses and off‑grid projects. Due to booming market demand, verify certifications like CE and UN38.3. Match capacity with daily power consumption; pick parallel‑expandable models if budget permits.