Power supply requirements
- Chris Hilder
Kaffelogic roasters have a rated power consumption of 1400W. However, in situations where power may be questionable, such as where you must use a long extension cord or where the supply is a temporary set up, you will need to assess your ability to roast successfully.
First, check the rating sticker on the base of the roaster.
Rated voltage | Recommended minimum supply | Absolute minimum during roast |
|---|---|---|
100-110V | 100V | 97.5V |
110-120V | 120V | 115V |
220-240V | 220V | 215V |
However it is not sufficient to just measure the voltage at the plug with a volt meter, nor is it sufficient to rely on the supply voltage reading on the roaster. The critical measurement is the voltage during the roast. It is possible for the voltage to drop when the roaster starts to operate. It is also possible for the voltage to drop when other equipment on the same circuit as the roaster is operated.
Check for other equipment on the same circuit as the roaster. If there is any equipment with a heating function, e.g. espresso machine, kettle, room heater then you need to consider whether that equipment will operate during a roast. If so, carry out this test with that other equipment operating and drawing its maximum power.
Use a power meter that is capable of showing supply voltage and power consumption continuously during the roast. For example
Run an empty roast test and monitor the voltage throughout. Voltage will fall during the test, but it must not fall below the absolute minimum shown in the above table.
Run a full roast as a final test. Use the largest batch size that you plan to roast, and the most aggressive roast profile you intend to use, that is, roast to the highest end temperature with the steepest ROR that you intend to roast. Again, voltage will fall during the test, but it must not fall below the absolute minimum shown in the above table.
What to do if you do not have sufficient power
There are two approaches you can take.
Improve the power supply. Eliminate or use a shorter extension cord. Use an outlet with a better feed back to the mains board. Ensure that other equipment on the same circuit as the roaster does not operate during a roast.
Adjust your roast practice. Roast smaller batches with less aggressive profiles.