Abstract: Energy storage inverters are crucial for connecting renewable energy sources to the grid, ensuring stability and efficient energy use. However, they face reliability challenges due to fluctuations in renewable power and grid demand. Effective thermal management is essential to enhance reliability and minimize economic losses from unplanned shutdowns. Existing research focuses mainly on thermal management of inverters on the renewable energy side, with limited work on strategies for energy storage inverters. This paper proposes a strategy to control IGBT module heat in energy storage inverters by reducing switch frequency. It uses long-term operational profiles to set targets for reducing junction temperature fluctuations and determining maximum temperature thresholds. Simulations using a photovoltaic energy storage inverter validate that this strategy effectively stabilizes junction temperatures, reduces lifetime consumption, and extends the inverter′s operational life.