I suspect that it's less than a factor of two. Is this right?
A 1 kw panel has 10kg of silicon at $20/kg.
That's $200 for a panel that costs less than $400, at 34 cents/watt.
That's $408k for something that sells for less than 750k.
Anyone have better information? It seems like renewables are being sold basically at material cost, plus some profit and administrative overhead.