Pretty easy to large batches as well, you just need space to hang bags. Same protocol as small batches: soak grains in water for 8-10 hours for most (buckwheat 30-60 minutes only), drain and rinse well. But if doing large batch(es), put soaked and rinsed grain in old pillow case, or similar, loosely tie off neck, and hang somewhere that it can drip, get good air flow, but not dry out too much (likely a bit of experimenting per your environment’s temp and humidity. every 12 hours or so, dunk bag to rinse and re-wet and hang again. Obviously you can do multiple batches in parallel if you want to grow a stash. I learned this from someone who was growing for a commune kitchen in the Arizona desert. He rigged up cross bars and hung his bags in a covered pit to protect from the heat and dryness of the locale. Dry sprout by spreading on baking sheets in low temp oven, with stirring every now and then until crisp, then grind to flour.