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 their discription if they are subject to this. Modules affected by stacking penalty multiplier include, but are not limited to: Electronic Warfare (target painters, webbers), resistance bonuses (hardeners, etc), Ship speed modules (nanofiber structure, inertia stabilizers and overdrive injectors), and others.

It is important to note that stacking penalties are attributed to the stat affected, not certain modules. E.g. it is possible to use a Nanofiber Internal Structure module and only receive a stacking penalty to the velocity bonus from an Overdrive Injector that is also fitted, but not to the agility stat if there is no further module affecting that attribute.

The Formula

The 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

Stacking penalties