tompoland The readings are confusing, but the power meters are not all made equal. Some things you need to check:
- Check each power meter on a known accurate non inductive load (e.g. a 40W bulb, then a 60, lastly a 100W)
- make sure the power meter is on W and not apparent power VA a small explanation of these things is here http://www.cromptonusa.com/Watt_Var_VA.pdf
- check that both meters are on W
- to eliminate the burrs and burr rub etc.. from idling with no beans, simply remove the burrs
- If the grinders are new and not used hardly at all, motor armatures and brushes bed in and the motors consume less power over time when idling (from memory around 34-38W). Voltage dependent
- swap the meters during the idling tests
Certainly the readings don’t look right at all. I have seen even 80W ish on a new grinder when idling, which quickly drops to the normal level after some run time. Usually after 20m of grinding they are run in.
When testing with coffee.
- It’s absolutely essential to ensure grind is the same (as far a possible) by making shots
- shots should always be made after every test, to ensure something hasn’t happened to affect power readings.
- the grind times must be accurately recorded (I use a stopwatch)!
The results don’t look right at all, the Mazzer Kony burr is doing exactly as it should and consuming the correct amount of power. You mentioned the GG variants were consuming less power, but taking longer…which they would as it’s power over unit time…the longer it takes, the less power it consumes
The other thing that’s important is the power curve characteristic in determining grind quality in terms of the width of the bell shaped curve of particle distribution. Which is why the flow control disk is there. Your meters may only update every few seconds (I don’t know), but you are looking to get as close to a square wave of power consumption over grind time as you can. Long drawn out finishes (or starts) with gradually diminishing (increasing) power, are not what you want. I know the grinder world doesn’t make much of this…but after almost 7 years of testing, it’s something I learned and why I came up with the idea for the NFC disk. It’s also “just one” of the few reasons why the Duo runs at the speed it does!
I didn’t go into detail about the testing you need to do in my earlier post, because I really don’t have time, but hopefully the points above will help.