You can use it at half capacity without impacting flavour. Is the tank going to be jacketed and insulated or how are you cooling it? If it is jacketed make sure you see the technical drawings and make sure that the jackets will actually touch beer if it is half full and that the thermowell is...
Reviving an old thread, where are you guys getting your 24VAC power supplies? I ordered one only to find out the seller listed it incorrectly and was actually DC, now I'm having a hell of a time on ebay trying to find either a new power supply or something to convert the DC back to AC
Yes it'll work, I have the Blichmann 27 and can still ferment 5 gallon batches in it. The headspace won't be an issue and yes if you feel worried about oxidation you can always purge the headspace with a CO2 blanket. As far as losing beer to trub/yeast collection you won't lose more than you...
I have both pin and ball locks. I use the flared disconnects so I can just swap those out depending on which keg I need hooked up. The only downside to pinlock is the fact that they don't have the pull ring pressure relief but that's not a huge deal to me, I just stick a screwdriver in the gas...