Helen Phillips

@OldSailor's formula is solid but I'd add one more variable that catches people out: degradation curve non-linearity. Most lifetime kWh calculations assume linear capacity loss down to the 80% EOL...

The issue with "low-draw" is it's meaningless without context. I'm running a shepherds' hut setup on roughly £1,800, which powers lighting, a 12V fridge, and occasional EV...

@DevonDweller's spot on about internal resistance — that's the metric that actually tells you something useful.