Variable Tension, current limited, 10Amp Power Supply Unit

[tonyfoale]

The fan does not seem mandatory and the fact it doesn't heat too much makes me think it's quite efficient.
It really is a good extension to an atx psu, which has actually far too much watts than necessary.
I like it. Yesterday, I made my electrolytes with it, it sustained 10v 3A during 3hours and half, not even hot,.
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You are outputting 30 watts there, so at 80% efficiency you will only be heating your box with 7.5 watts. Fan not needed.
However, if you run it at the full 130 watts (assuming that is output power) then the waste heat will be 32.5 watts, you may need the fan for that.