When designing a ship there is currently no way to predict its energy requirements during boost. Sometimes you need to have much more precise info than a guess because the design depends on it.
Please add more detailed stats regarding planned energy usage of the ship, for example the following readouts:
boosting time until the ship starts using battery -- so we could pland and balance the energy use and engines amount/power
free energy left after the first second of boosting -- so we could understand how much headroom for other systems is left in our design