resuplying ships

500 split between them. Yes this is a rather paltry amount, so build more than 1 resupply depot in any frontline system. Also research starship support as this makes them better.

I tend to build enough resupply to give me around 7000 per turn (and reduce the amount of depots as my tech level increases)

I second that. Tho I don't then to go quite so high maybe about 3-5K depending on the system.

You can also move your fleets to friendly planets and they then fill up directly from the planet...tho it may leave you planet empty of supplies for a turn...if its a big fleet you can go planet hopping to resupply faster.

Also I try to get sollar collectors as fast a possible too and means they have a minimum of supplies always... also helps to take the strain off those poor supply depo.

Only the Awkward question; only the Foolish ask twice

I tend to leave solar collectors till later in the game when I can get them upto level 20 in 1 turn and grab the solar sails, this is why I probably build more supply depots than you

I only build that many in frontline / strategic choke points, every system will only have 1 to help top up passing traffic, and keep all the planets in the system full in case of emergancies.