When I build a craft I normally total up the electrical consumption of all my parts, lights, quantum struts, kethane converters etc, anything and everything that uses electricity (toggle-able or not). I then total up my electrical generation rate from any part capable of doing so (**during the crafts main mode of operation). Simple way of making sure I dont end up "dark". Could MJ2 do this maybe similar to the way it currently measures Intake Air.

ElectricalCharge capacity - visible in the VAB/SPH.

**ElectricalCharge needed - works only in flight, this would change based on what is currently consuming power. Also shows "time to depletion".

ElectricalCharge needed (max) - Everything capable of drawing power

ElectricalCharge generation - works only in flight, this would change based on what is currently generating i.e. solar panels (their current effectiveness), rtg's, reactors.

ElectricalCharge generation(max) - Everything capable of generating power at max.

. . . All under Vessel Info and or available in the Custom Window Editor. Also any other useful stats you can think of such as solar panel generation based on distance to the Sun.

What you need is an addon called called FuzeBox.

On the other hand, we'll surely approve a "prevent chargeout" feature for all that Ions! =^_^=