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Wang has advised me to try these settings - P=5,I=0,D=2. Also said the fan should be under the coals. Think I'll buy an elbow join to connect it to the BBQ so ash doesn't fall straight down into the fan workings. Will post again when I have had another go with these changes.

I've dropped him a line, cheers. Graph or not, do you know how big your temp cycles are?

Don't have any photos from the cook unfortunately. The BBQ is a bit leaky, but no more than any other Weber kettle I wouldn't have thought. I did notice when the Qmaster was blowing, a fair bit of of smoke was escaping between the lid and the BBQ. I had the vent on the top mostly closed, by opening this a little (which would result in less positive pressure) I'm guessing it would prevent this from happening, but I understand you want this pressure in order for the fan to work effectively. I had all vents other vents completely closed. Given it was so damn cold outside that weekend, I didn't spend much time keeping an eye on the LCD on the Qmaster. I was mainly watching the pit probe (Inkbird IBT-2X, bluetooth) from the relative comfort (and warmth) of my home. It didn't help that I had the Qmaster in Celsius and the pit probe in Fahrenheit as I was having to use a converter to compare the two. I changed this half way through. I did notice a fairly big difference between the Qmaster temp and the pit probe, even though the probes were in the same spot. I have subsequently calibrated both in boiling water and both were reading the same +/- 1 degree, so not sure what was going on then. In any case, I can see based on that graph that the fan was coming on when it should have @ ~220. I did change it at various stages, which is why the graph shows the fan turning on at different times in the first few hours. The problem just seems to be that it is staying on for too long? For comparison, do you have a graph of any cooks you've done with the same unit? I'd be interested to see how big your swings are.

Received my Lite yesterday, coincidentally on the day I had planned to smoke some ribs. It was pretty straight forward to hook up to my weber kettle. Overall pretty happy, but are a bit surprised by the big swings in temperature. With the Qmaster set to 220 it keep the temp between 220 and 272 deegrees. 272 is a little hotter than I wanted it. Opening the lid caused big spikes which I suppose is to be expected. Also probably a factor, I chose to smoke on what was apparently the coldest day of the year - may have been why the temps cooled so quickly? Maybe on a warmer day the cooling period would be longer. Is there anyway to have it cut the fan off earlier? I'd rather it come on more often, but for less time. This would result in smaller, but more frequent spikes. Ideally I want to keep the temp between 225-250 (ie a range of 25 degrees, not 50).

Thanks @Smokin Monkey. I've ordered one of those, my xmas present but who knows how long it will take from China! Keen to get a mains adapter for this, don't suppose you're able to check the voltage/ampage of the supply you have for the lite? What prevents ash from falling from the chamber into the fan?

I'm looking at picking one of these up too. I've got an older style weber kettle (with the 3 vents at the bottom, not the one touch - pictured below, not mine but the same!). Does anyone know which adapter I need from those available at http://www.allchinas.com/lite/ ? I'm thinking the E adapter can probably be screwed into one of the 4 holes? Not sure what the thread size is though. More generally, do you guys think these ATCs are worth their price tag? I'm pretty decent and keeping my temps around my target, but it requires a bit of running up and down my stairs to adjust the vents (every hour or so I suppose, but it means I'm pretty much always looking at the temps). I'd love just to set and forget these smokes so I was hoping this would enable that.