Global energy transition boosts the all‑in‑one energy storage market, with 5kWh‑20kWh models seeing growing shipments. Overseas demand rises from grid instability and peak‑valley price difference for household backup and solar self‑use. Domestically, it serves villas, self‑built houses, construction sites and off‑grid remote areas. Its main strength lies in simple installation and low maintenance threshold for ordinary installers. Products are evolving toward safe LFP cells, IP54+ protection and APP remote monitoring. Avoid judging only by nominal capacity; focus on usable capacity, cycle life and grid‑tie/off‑grid compatibility. Further market growth will come from small‑scale commercial, RV storage and micro‑grid projects.