If you use a cooler MT then 10G batches are easy with traditional AG techniques you'll have a BK and HLT. For the last few years I have only brewed 5G batches. I use sort of a batch+sparge method.
I'll use 12 gallons as the total H20 volume to keep it simple.
- Add 6G to HLT/MT, bring to mash temp
- Dough in then mash for 90min
- Add remaining 6 gallons to BK, heat to sparge temps once mash is 15 min away from complete
- After 90, mix then recirculate the mash until clear.
- Drain off wort (into small 5G pot) until grain bed settles a bit (with a high water to grain ratio this is needed, plus need room for more sparge water)
- Add 6 gallons of sparge water slowly from BK into MT while still draining wort into my 5G pot
- When 5G pot gets full I stop the wort and finish transferring my water if not done already
- Dump the 5G pot of wort into the BK and start the heat
- Finish sparging until I get what I need
The rest of the brewing process is normal. Some may worry about too much water on top of the grain bed and getting a stuck sparge, I have not had that issue but I sparge slow.
David