Can someone explain what "per watt of capacity" means?
I know it is used to price solar panels but I do not understand the units.
Anything that generates electricity is generating power, which is measured in watts. A generator, a battery or a solar panel has a maximum output capacity of a certain number of watts. How much power it puts out depends on the demand of the circuit and on the input power. A generator can vary its output power as its speed varies, and a solar panel varies its output with the amount of sunlight impinging on it. So output can vary considerably, but the capacity is the maximum it can output under optimum conditions, and this is a key specification you want to know when designing a circuit around a particular power source.
A solar panel of a given size will be rated at a certain wattage output, assuming an optimum sunlight exposure. So it it costs $100, the cost per watt capacity is $100/ the rated output.
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