Stacking penalties
From EVE University Wiki
Stacking penalties
Stacking penalties refer to an effectiveness reduction that is incured when using two or more high, mid, and/or low slot modules (mods) that effect the same attribute. Most, but not all, mods show in thier discription if they are subject to this.
The Formula
Stacking penalty for module number n is
S(n) = 0.5^(((n-1) / 2.22292081) ^2)
The Numbers
1st mod: 100,00% effectiveness
2nd mod: 86,91% effectiveness
3rd mod: 57,06% effectiveness
4th mod: 28,30% effectiveness
5th mod: 10,60% effectiveness
- Shield resist mods incure this penalty for the specific damage resisted when used in conjunction with Invulnerablity Fields
See also Module Stacking and Speed Modules.