What is the maximum roasting capacity of the Ailio R1 V2?
Can it full 1 kg?
Yes, you can roast a full 1kg, as the R1V2 is designed to roast to that capacity.
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Technically, yes, but I would advise against it. The sweet spot for the R1 tends to be in the 800g range on the high end of loads.
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how about roast for espresso? it possible sweet spot range on?
It really depends on a lot of things.
For a while I ascribed to this school of thought and I aimed to have batches no bigger than ~930g. I believe an 800-900g batch is probably “easier” because it is easier to manage, as you are not pushing the bullet to its limits. However, I believe from a subjective perspective of whether or not the roaster can handle it, yes it can handle 1k batches, no problem. I do think that you may find it more challenging to properly manage air flow and heat and timing, etc, etc., but that doesn’t mean it isn’t possible.
I have been able to roast all types of coffees to all types of roast profiles at the 1k batch size, without compromising quality–it is certainly possible to roast for espresso at 1k batches. Something to consider about espresso is you probably want a longer set-up to dry out the beans more. To achieve this, I usually decrease my preheat temp. Normally I preheat to 310C for 1k, but if I want a longer set up, I will do 300C
Another issue to consider concerning batch sizes is: what is more efficient for your purposes. I started an online business recently selling the coffee I roast, so I have been roasting about 20-30 pounds a week recently, and climbing. That being the case, I figured out I can roast a little more than 5 pounds in 3 batches on the R1V2, if I roast at 1k batches. Let me show you what that means given a 15% loss (my average for a “medium” roast).
1kg raw = 850 roasted
850 x 3 batches= 2550g
2550/454=5.6 pounds
5.6 x 2 batches=11.2
5.6 x 3 batches=16.8
That means once I do two batches, I actually have 11 pounds and change, and once I do it three times, I have almost 17 pounds.
I used to make calculations very specific within like 10-20 grams depending on how much I wanted to roast. For example if I wanted to roast 5 pounds exactly, I would figure out how much I needed total: 2270, which comes out to 2671 green coffee. I want even batch sizes for consistency’s sake, that is consistency of the flavor, and consistency of method in my roasting, so I take 2671 and divide by 3 and that gives me 890.333. Thus, if I roast 3 batches of 891 and ensure an average loss of 15%, then I will get 5 pounds roasted with little to no leftover.
But that’s not my goal. I want to roast as much as I can, so I just roast 1k batch sizes and allow the “excess” from each batch to build up over time as I explained above.
As far as the timing goes, you might shave off a minute or so roasting ~8-900 instead of 1k, but then you’re missing out on that 100g of coffee. According to my hypothesis based on my own roasts, that doesn’t result in any increased efficiency.
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I did over 500 batches at 1130g last year. Some were a one and done, others were B2B. I’ve done up to 27 B2B in a day and have not had an issue. I get a full 2#s roasted every batch.
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Holy cow! That was all on a R1 V2, yea? I have gone up to 1050 grams in a roast but never that much above that!