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What is the advised or practical limit to the number of valve solinoids that an OS system should activate at the same time?
The firmware does not limit the number of parallel stations — the limit depends on the current rating of your sprinkler transformer. Just to give you an idea: each solenoid, when open, draws about 180 to 250mA of current. So if your sprinkler transformer is 750mA, you can most likely run 4 valves at the same time — in practice it can be more, because as more valves are open, the total current draw increases, which drives down the output voltage of the transformer (AC transformers are un-regulated), thus the current per station reduces, and consequently more valves can open. I did some tests a while back, with a 750mA transformer I can open 8 valves at the same time.
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