As I write, I'm doing my second double-batch today - in other words, I'm currently brewing my 92nd litre for today.
I've done this in a 70lt Robinox pot and it's been a relaxing day.
There are very few advantatges to double-batching unless you brew the same one or two beers over and over or unless you have 50lt kegs and the set-ups for them.
So, why have I done two double-batches today?
I have a brewing mate around the corner who I have taught brewing to. This has many advantages. As long as you trust the brewer, every brew you do gets twice the result or, if you are adventurous, you can try twice the variations on a brew far more accurately than you can on your own.
I also now have six beers on tap (one fridge, one manifold, one tap.) 5 of these 6 are tried and trusted recipes and I know that they can't be buggered up easily. So, for me to entrust these recipes to be brewed well by someone else is no big deal.
So my only challenge is keeping the mainstream kegs full with the minumum of time and effort. The best way I have found of doing this is having a brewing partner as described above.
As you brew, your tastes will develop and you will never ever want two kegs tied up with the same beer. So, double-batching only becomes relevant when you find that ONE beer that you REALLY love.
So, don't worry about double-batches for now when you consider equipment.
Mind you, you should consider BIAB and you should look that method up as it will save you considerable time and money and enable your double-batches should you so desire (make sure you have a 70lt pot though.) I used to batch-sparge but today would habeen a bit of a mare had I done it that way.
All the best to you,
Pat.
P.S. Youngy, if you have any further queries, then email me via the My Profile thingo.
Morning Edit for Matti!: Only had full-strengths last night hence the post - lol. I'll send you a pic though of how to manage the double-batch BIAB's later today