Solar power is abundant in daytime but unavailable at night. This 5kWh wall-mounted LiFePO4 battery solves the mismatch between power generation and consumption. It stores solar energy during the day and releases power for evening use to cut electricity bills. It supports on-grid operation and can join demand response programs in some regions. The wall-mounted design saves room space and fits balconies or electric rooms. LiFePO4 chemistry brings stable performance and low risk. It requires little daily maintenance. Perfect for villas and self-built houses to improve the economic benefit of solar systems.