Re: Temporary load for power supply testing
Cunning!
In the past I've used a coil of galvanised-steel agricultural fencing-wire to make a 48VDC dummy-load; dunk it in a (plastic) bucket of water and it can dissipate a few hundred Watts for quite a long time (I ran it overnight and only a bit of the water boiled away).
Old car headlamp bulbs are also good - I get H4 (main/dip beam) bulbs with one dead filament for free from my local friendly garage. Wire a bunch of these in series/parallel and you can easily get to 500 Watts dissipation.
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