Energy Consumption

[Tim]

The Watt vs. Amps numbers shows that you're calculating using a voltage value of 120V. But that's an AC voltage at the wall outlet; you can't convert that to power by multiplying by the DC current through the device.

Ignoring transformer losses, what you have is 1.1A at 24V, so that's 26.4 Watts idle.

2.5A is 60W with the extruder heater on.

7.9A is 190W with the bed heater on.

Those values are quite close to what Jim said you should expect to see.

[pyronaught]

I got my kill-a-watt meter today:

idle = 16 watt

w/extruder = 56 watt

w/hbp = 225 watt

w/extruder & hbp = 264 watt

------------------------------------ other stuff
LED cabinet light = 6 w
temp controller = 2 w
cooling fan = 4.5 w

So 300 watts looks like a good worst case number to size the UPS.

[sthone]

Does this mean I don't have to listen to my other half complain about the electric bill after all?

-Steve

[Tim]

Although if you have or expect to get a dual extruder setup, then count on an additional 40 to 45 W for the second extruder.

[jsc]

If you ran it at 300W continuously, 24 hours a day, for a whole year, and lived in Connecticut which has the highest residential electricity rates barring Hawaii, it would cost you $5.31/yr.

[pyronaught]

If you ran it at 300W continuously, 24 hours a day, for a whole year, and lived in Connecticut which has the highest residential electricity rates barring Hawaii, it would cost you $5.31/yr.

My rate varies depending on demand but averages around 10.8 cents per KW hour. So 300watt = .3 KW, which would make the hourly cost of running at 300 watt continuously 3.24 cents/hr. That would then be 77.76 cents per 24 hour period x 365 = $283.82/year. Either Connecticut has an extremely low rate or your calculation/decimal point is off.

[jsc]

Whoops. An egregious arithmetic error on my part.

[sthone]

I going to go with the $5 figure if she asks.

-Steve