I'm trying to calculate the maximum current draw for an old chest freezer, as part of working out the requirements for an emergency generator.

The freezer (a Norfrost) doesn't have any model number visible, but does have this sticker on the compressor:

freezer compressor label

This suggests it draws 0.6A, so 144W at 240V - but that seems surprising low to me given that a similar new one is rated at 150W, and new appliances are supposed to be much more efficient than old ones.

Can I therefore assume it is correct, or is there something else in there that gives a better clue? Or do I need to get hold of a clamp meter and test it to be sure? Will the startup current be three times that (so 432W)?


I would assume this label to be correct.

The newer freezer may well have a higher maximum rating than the old one but draw this much power not as often or as long as the old freezer, so that the overall power consumption of the new machine might be lower, as expected.

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