I've been struggling with slow roasts on my Behmor 1600 for a long while now. I moved from the US to the UK 5 years ago, and picked up a 3000W 220/110 voltage converter when I did so. Roasting was fine for a while as I seem to recall, but then got slower. It takes me about 10 minutes to get to 1st crack with 1/4 lb (113g). This seems very slow. I put a thermocouple in the chamber when I did a 1/2 lb dry run, and the temp got up to around 218 deg C when it turned the coils off. It dropped to around 208 before turning them back on again (according to the thermocouple). Tech support seems to think those numbers sound about right.
I've replaced the transformer, circuit board, and thermocouple, all to no avail. I've measured the voltage suppled with a Fluke multimeter to be around 118V, so that doesn't seem to be a major issue. The supply delivers its voltage at 50Hz, not the US standard 60 Hz, and that could be a problem according to Behmor tech support. Nonetheless, if the temp is getting to the right value, I'm a bit flummoxed as to why my roasts are slow.
I'm wondering what temps others get in the chamber... maybe mine is low after all? Any other thoughts would be much appreciated!