Roasted two batches of 1.5kg green beans, back to back. First batch was 1.2 kWh, the second just 0.85 kWh so as was to be expected it's prudent, energywise, to roast back-to-back instead of one batch per day.
Still, for me, to be able to have enough freshly roasted beans ready for people but not too much in stock that is getting old, roasting at most one batch per day is more convenient.
