Coffee-Tech Solar 9

the verdict

the Solar 9 sits between sample roasters and production machines with 1 to 9 kg batches. it's aimed at roasters who need production consistency but still roast enough single-origin microlots that sub-1 kg batches matter. the 1 kg minimum gives you sampling headroom without wasting expensive competition lots, and 9 kg maximizes let you build weekend inventory or handle small wholesale accounts. gas modulation and profile logging help with repeatability once you've dialed profiles. the closed combustion chamber design keeps smoke out of customer areas if you're roasting in a cafe. trade-off is the narrow sweet spot: if you're regularly running 8 or 9 kg batches you'll outgrow it fast, and if you're mostly doing 1 to 3 kg runs you're paying for capacity you don't use. it's best for roasters doing 50 to 200 kg weekly with diverse SKUs and retail focus, where batch flexibility matters more than raw throughput.