The ESS or Energy Storage System (Battery) is a key part of the modern hybrid PU in today’s F1 cars.

2014 Regulations require teams to use a hybrid system with two energy generators, MGU-K and MGU-H, charging batteries to store energy for deployment on demand. 

The battery’s charge level changes significantly throughout the lap. You will hear reference to harvesting during an out-lap or a cooldown lap, where the battery is being topped up, and then it can be fully depleted during a single lap, for example in qualifying.

Also, known as an Energy Storage Systems (ESS):

  • Power output: Additional 161bhp
  • Maximum harvest energy: 2MJ per lap
  • Maximum energy output: 4MJ per lap
  • Battery weight: Limited to 20-25kg
Andrew Burden

The author Kiwi F1 Fan