The key to extending the lifespan of residential energy storage systems lies in scientific use, environmental control, and regular maintenance. The battery, as the core component, directly determines the overall system lifespan. By optimizing charging and discharging strategies, controlling the temperature environment, and effectively utilizing management systems, degradation can be significantly slowed down, extending the service life to over 15 years.
Controlling the Depth of Charge (DoD) to Avoid Overcharging and Over-discharging
The ideal state of charge (SOC) range is 20%–90%. Maintaining this range long-term can significantly reduce cell stress.
Avoid discharging to 0% or charging to 100%. Keeping the depth of discharge below 80% can increase the cycle life to over 6000 cycles.
If the system supports this, a charging upper limit of 90% and a discharging lower limit of 20% can be set to balance range and lifespan.
Maintain Suitable Operating Temperature and Avoid Extreme Environments
The optimal operating temperature is 10℃–35℃. High temperatures accelerate electrolyte decomposition and SEI film thickening, while low temperatures reduce lithium-ion diffusion rates, affecting efficiency.
Avoid installation in direct sunlight or enclosed, high-temperature spaces (such as attics). In summer, install ventilation fans or sunshades.
In low-temperature winter environments, avoid high-current discharge. Some systems support battery preheating functions, which can effectively prevent lithium dendrite formation.
Reduce Frequent Charging and Discharging and Optimize Power Consumption Strategy
Prioritize direct photovoltaic power supply when sunlight is abundant to reduce the charging and discharging frequency of the energy storage battery and lower cycle losses.
Set appropriate operating modes:
Economic Mode: Charge during off-peak hours and discharge during peak hours to achieve arbitrage;
Self-Use Priority Mode: Prioritize consuming photovoltaic power, storing excess power to reduce ineffective cycles.
Avoid high-rate charging and discharging (>1C). It is recommended to use slow charging and discharging below 0.5C to reduce polarization effects and internal resistance heating.
