Why I stopped using flat $/kWh to size commercial...

I've been building energy APIs for about four years. The thing that kept bothering me wasn't the code — it was watching tools I respected give completely wrong BESS cost estimates because they multiplied system size by a flat dollars-per-kilowatt-hour figure. That's not how battery storage costs work. And it matters a lot when someone is deciding whether to spend $800,000 on a system. The problem with flat $/kWh Most BESS calculators I've seen do something like this: # What most tools do — this