Whatever you are doing, hitting spirits, doing missions, jumping around your home beacon for nothing but brainless action in mind there is one basic rule to use conserning the beneficiality that you are in your energy gathering and teams energy gathering.

NEVER let your manapool fill up to maximum!
1) attack something anything be it even a 1 energy spirit.
2) let the manapool regnerate at all times so it won't be set to standstill.
3) saved mana is useless mana and useless mana is no energy!