Why would you have a 200A panel but only run a 100A service to the sugarhouse? I have 200A, but the big question is how much RO could you possibly need in 10 years? If you only need a 125 or 250 RO, the power is much less than if you need a 1200 GPH RO or even larger. While an RO saves loads of time and fuel it takes lots of electric to run it. (the good news is that it saves far more than it uses) That should be where you address your crystal ball. We don't know what that answer might be. If the 12x16 sugarhouse won't get any additions, nor need any, 100A will be plenty, but if you get bitten bad by the maple bug and you add room for a larger evaporator, a large RO, a big water jacketed bottler, a large electric HW heater, a high pressure blower and a few more things, you might well need 200A or even more.
Try to lay out your production "maybe" goals 5 and 10 years out. Do the power now for the 10 year, if you get even larger, address that issue at that time.
When I started, I had a 5000 watt generator, then I got a 6000 watt. Then I put in 6240 watts of solar, of which 1480 watts are on battery backup/grid tied, the rest is plain grid tied. When I did that I had to bring in grid power, my house is 3 miles away. I ran a 200A service, but since I have the solar which also feeds the panel, I had to use a 225A panel box with a 200A main (code says I could only over power the box by 10%, that meant I had too much solar to feed into the panel box. With my 225A box and the 10% over rule I could run 247.5 A into the box. That covered my needs). I first thought, when building the sugarhouse that a 30A generator would do it, I now have 45A just if I run my WJ bottler and the RO at the same time, not to mention lights, my high pressure blower, my electric vacuum pump, my 2 freezers for syrup storage and my compressor which powers the filter press air powered diaphragm pump. Not trying to scare you, just pointing out that plans change. My plans went from needing a 30A genny to needing over 100A in about 8 years time, many grow faster than that.
Dave Klish, I recently ordered a 2x6 wood fired evaporator from A&A Sheet Metal which I will be converting to oil fired
Now have solar, 2x6 finish pan, 5 bank 7x7 filter press, large water jacketed bottler, and tankless water heater.
Recently bought another Gingerich RO, this one was a 125, but a second membrane was added thus is a 250, like I had.
After running a 2x3, a 2x6, 3x8 tapping from 79 taps up to 1320 all woodfired, now I'm going to a 2x6 oil fired and a 200-425 taps.