Calculates pile group efficiency using the Converse-Labarre formula from individual pile capacity, pile spacing, and group geometry. Group efficiency below 1.0 means group capacity is less than the sum of individual pile capacities — piles interact through overlapping stress zones.
Inputs
D M
Distance across a circle through its centre. Always confirm units match the rest of the calculation.
S M
Reference formula or conversion factor shown for context.
N Rows
Count of items or occurrences.
N Cols
Count of items or occurrences.
Results
group efficiency Eg
Useful output divided by total input, as a percentage. True 100% efficiency is impossible — losses appear as heat. LEDs: 30–50%. Electric motors: 85–97%. Switching supplies: 85–95%.