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Comments
Try bridging from one of the battery terminals to earth with something like a 470k ohm resistor. Even if there's a full 200 V across it that'll only draw a tiny current and dissipate negligible power but I expect it'll actually drop the voltage quite a lot.
Not having a 470k to hand, would it possibly hurt the inverter if I used a 60W incandescent light bulb?
Of course, the thing I'm more concerned about is if it would hurt a person - who happened to be touching the chassis whilst they touched a battery lead (with the unit operating).
Trying to think of a purely resistive low-power mains device. Difficult. Small soldering iron?
[¹] It's also something all (ex-)HP employees ought to understand - the company got started making an oscillator which used the positive temperature coefficient of a light bulb for stabilization. A few used in the making of the film Fantasia.
[²] Also, I think, why they tend to blow when you turn them on.
I have a soldering iron, I'll see what its resistance is, ta.