Some useful information on Plasma Cutters

So you know how much better modern PlasmaPart inverter plasma cutters are at cutting than the normal transformer type - but did you know they were green?…

The output is smooth DC, not rectified AC. This gives a better-formed plasma beam and excellent stability. And this power source allows fine and infinite control over the cutting power and cut.

Not only are they better & easier to cut with, PlasmaPart inverter based plasma cutters are significantly lighter because they don't use large transformers - instead a very efficient high frequency inverter does the hard work. In our machines the inverters run typically at around 98% efficiency so almost all the power going in goes into your cut - not into heating up the machine. Unlike a typical transformer based plasma cutter whereby a full 30% or more of the input power is wasted on losses in the transformer.

For example cutting at a genuine 40amps output, using a standard transformer plasma cutter at 100V arc voltage, power in the plasma beam is as follows:

40 x 100 = 4000 watts or 4kW

However, taking into account the losses on an average machine, the input power to the machine would be:

(40 x 100) / 0.70 = 5714 watts or 5.714kW

The same calculation with a typical PlasmaPart inverter CUT 40 plasma cutter would be:

40 x 100 = 4000 watts or 4kW

With losses added:

(40 x 100) / 0.98 = 4081.6 watts or 4.08kW

A huge difference in efficiency, so not only are your cuts better and you can actually lift your machine, but you are saving over 25% on your electricity bill when plasma cutting!


You may have never considered how much power your plasma cutters use when they are “idle” - switched on but not cutting - this may surprise you:

Take for example a typical PlasmaPart CUT 40 plasma cutter:

Its power usage at idle is less than 10W with the internal fan running.

An average standard 40A transformer based plasma at idle with the fan running consumes over 480W!

That’s over 48X the power consumption before any cutting is done!

Take that over 1 year left in the workshop and the comparison is thus:

Standard AC transformer 40A plasma cutter at idle:

480 / 1000 = kWh

= 0.48Kwh x 24 = 11.52 kWh / day

At 12p / kWh that’s 11.52 x 12 = £1.38 per day at idle! – that’s £504.58 / year!

By comparison the PlasmaPart CUT 40 plasma cutter: would be as follows:

10 / 1000 = kWh

= 0.01kWh x 24 = 0.24kWh / day

At 12p per kWh that’s 0.24 x 12 = 2.88 pence per day! - that’s just £10.51 / year!

What a saving – if left on all year as many are, the PlasmaPart Inverter would save you £494.07 in electricity costs just at idle, and far more if used extensively.

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