Originally posted by JRqwertyui
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The most common way I've seen used is to discuss entire system price before any rebates, tax credits., in terms of $$ (or currency) per the entire STC (D.C.) W of panels. Other methods then sometimes/often are added for further explanation(s) and descriptions of system performance or characteristics.
So, other ways, such as $$/kWh production per time period (per year for example), per installed STC kW of panels also have use. Sometimes the units get convoluted and a bit confusing.
Most descriptions use or at least start with total $/installed price before rebates/tax credits per total STC W of panels and go from there.
So, paying $15,000 bottom line to a vendor for a 5 STC kW turnkey system (after any/all of their come-on/B.S. rebates etc.< would have a price usually describes as $15,000/5,000 STC W = $3.00/ STC. W. Often, the STC letters are left out but implied or assumed known.
If that system then produces 9,000 kWh/yr., the price of the annual generation will be $15,000/(9,000 kWh/yr.) = $1.67yr/kWh.
The absolute value of the numbers are different because they are describing different things using different units.
The definition police won't whack your peepee for using more than one definition, provided it's clear from the context what you are talking about. Others can always ask for more information.
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