Does anyone have a link to a battle calculator then?

the AI is spamming nubians which is forcing me to leave Nubians on every planet to try and stop him from re-colonizing them the next turn

beams will take more damage and get worn down much faster.

A factoryless world wont be able to build defences fast enough before the packet hits in 2 turns usually. Also ive seen the AI just spam large enough packets that will wipe out a colony even with a warp 7 driver and max defences.

the AI will eventually spam enough ships to kill the destroyer

the AI will never get bored of spamming 1 ship fleets that are impossible to mass intercept.

the bottleneck is resources, which cant be transported to new colonies...

In my experience minefields are really expensive,

you need at least 50 frigates to put up a decent minefield,

100 if the enemy starts sweeping,

and it tends to not do anything except slow the AI down. The AI will just send colonizers at warp 4.

the AI doesnt try to stop me most of the time, it just re-colonizes everything

it takes forever to get a factoryless world up and running.

i find it weird that i never get messages indicating that i have gained tech points from invading a colony...