FAQs About the Connection & Interaction of Home Energy Storage Systems (Battery, Inverter, Solar Panels, Mains Power）

The inverter acts as the core link. Solar panels first send the DC power they generate to the inverter; the inverter converts this DC power into AC power (matching home electricity standards). From here, the AC power has three paths: 1) Directly power home appliances. 2) Charge the energy storage battery (via the inverter’s built-in charging module). 3) Feed excess power into the mains grid (if grid-connected). When solar power is insufficient (e.g., at night), the inverter can also draw power from the battery or mains to supply home use—ensuring a stable power source.

No, it won’t be wasted. The system automatically distributes the extra power in two main ways (depending on setup): 1) Priority charging the energy storage battery—storing the excess for later use (e.g., night or cloudy days). 2) If the battery is fully charged, the extra power is fed into the mains grid (for grid-connected systems). Many regions offer "feed-in tariffs" where you can earn money by selling this excess power to the grid. Only in off-grid systems (not connected to mains) will the inverter cut off solar input temporarily if the battery is full—avoiding overcharging.

The system switches power sources automatically without manual operation. At night or on cloudy days: 1) The inverter first uses power stored in the energy storage battery to supply home appliances. 2) When the battery’s charge drops to a low level (usually 10%–20% of capacity), the inverter seamlessly switches to drawing power from the mains grid—ensuring no interruption to home electricity use. Some advanced systems also let you set priorities (e.g., "use battery first to save grid electricity costs").

It acts as a backup power source. When the mains grid fails, the inverter detects the outage in milliseconds and quickly disconnects from the grid (to avoid endangering repair workers). It then switches to using the battery’s stored power to supply critical home loads (e.g., lights, refrigerators, routers—depending on system design). Note: The backup runtime depends on the battery’s capacity and your power usage. For example, a 10kWh battery can power essential appliances (about 500W total) for roughly 20 hours.

No—because solar panels and batteries output DC (direct current) power, but most home appliances (e.g., TVs, fridges, air conditioners) run on AC (alternating current) power. The inverter’s key job is to convert DC power (from solar panels or batteries) into AC power that matches the voltage and frequency of home electricity. Additionally, the inverter manages power flow between all components (solar, battery, mains) and protects the system from issues like overvoltage or short circuits—making it indispensable.

No, it won’t. Standard home energy storage systems (especially grid-connected ones) are equipped with grid-tie inverters that comply with local grid standards. These inverters constantly monitor the grid’s voltage and frequency, and adjust the system’s output to match—ensuring no voltage fluctuations or instability. When the grid’s voltage/frequency is abnormal, the inverter will also automatically disconnect from the grid to protect both the system and the grid. In short, the system works in sync with the mains and won’t disrupt its normal operation.