I love the concept of a split batch.
There’s something so precise and grown up about having a control. I also love knowing that the differences between two beers is solely due to that one little thing that you changed. I really enjoy being able to set up an experiment and see if any random “fact” that I read on the internet is repeatable. It also allows you to iterate faster with any given boil size when you are tweaking recipes.
We brew 5 gallon batches, some BIAB and some extract. We end up with around 4.5 after trub loss, and we can put half into either carboys or the often raved about 3 gallon corny kegs. Carboys are easier for primary (like yeast splits), but cornies are easier for secondary or when we add fruit, oak, or other solids.
You’ll definitely see a lot of split batches on here. Here’s a list of things we’ve wanted to test or still want to test. I’ll put links to the brew logs when we end up making them.
Split batch ideas
Oxygenation (maybe just a few bottles at bottling time would be best)
Light struck to different degrees
Different yeasts Notty vs US-05 in a dry stout
Fresh fruit / frozen Lager with Raspberries vs NoBerries
Different oak char levels
High / low ferm temps
Consistent / inconsistent ferm temps
Different dry hops
Different length boils
Low vs High ABV (by adding vodka at bottling)