Just got a free minute to check the forums. Life's been hectic for the last few months and all the side project stuff got put on hold.
It looks as if you are overestimating your compressor mass flow. Looks like a little pumpkin to me. If it's drawing around 500 to 600 watts, I would guess that it might move 1500 watts+ during ramp up, then taper off to somewhere around 1000 or so at equilibrium.
If you're using all copper fittings and tubing, you can use silfos rod with no flux. Once you start using silver, you definitely want to use flux. With the small stuff under about half inch (12mm), it's easy peasy. Just use an oxyfuel torch and the bare copper phosphorus rod. On the window unit and dehumidifier size systems, I use the little scuba tanks. They're super common, so it's not a big deal to exchange them.
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