The ECR (Energy Capture Rate) determines the amount of DEC that you earn for each winning game, so you must give good management to this to earn more DEC.
Fuente
The ECR decreases for each game, it does not matter if it is won or lost, and it recovers with the passage of time, I currently play until the level is around 75%, to find the next day the level recovered at 100%.
We must take all this into account, since the DEC can be exchanged for letters, votes in Steemit or directly change it to Steem,
Whatever the purpose of your strategy, it suits you to have more DEC each day.