I was wondering in a partial mash how much grain I can get away with to mash in a 5 ga kettle? I would like to start using as much grain and as little extract as possible. I can boil about 3.5 ga on my stove.
http://www.rackers.org/calcs.shtml
You could likely do AG, at 1.25 qt/lb you can fit 12 lbs. At 1.00 qt/lb you could fit 15 lbs. W/ that much grain i would think you could collect 4 gallons of pretty high gravity wort and dilute to 5 gallons...or do smaller batches. Maybe mash in the pot w/ a big grain bag and then sparge or dunk and rinse in a bucket or cooler. You will need some way to heat sparge water, or cold sparge. Once at rest temperature, i would suggest sticking the mash pot in a warm oven to maintain temp.
The partial mash recipes I have done so far had about 5# of grain and 5# LME. The mash temp holds very steady in my pot, and its easy to add a small amount of warmer water every 20 min or so to hold the right temp. I just wasn't sure how much grain I could use before I'm overrflowing the pot. I don't have the money or time for true all grain, but would like to improve the beer and cut costs by using less extract.
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