Building and powering a computer in a bronze age world

A character needs to build a computer out of raw materials in a bronze age.
He has a nano scale factory, so manufacturing chips and such from silicon is possible, but I'm not sure of the best way to power it without resorting to something stupid like "And then he built a fusion reactor".

I've considered some kind of battery (like the Baghdad battery) but it seems voltages would be to low to be believable.

I've also recently considered some kind of vat grown biological computer, powered by protein and glucose, but once again don't know if that makes sense.

Edit:
The factory is kind of a grey goo style nano-tech. Break down raw materials to build other things, but unable to provide power to anything else.

Edit 2:
The character is from an advanced civilization, studying a bronze age civilization. It only resembles StarGate in the broad description.

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Building and powering a computer in a bronze age world

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