does upgrades stack?

[gerald2]

if i install ie 2 identical shield upgrades will effect stack or just one works in this case?

[Geldric™]

Both ship & exosuit shield mods stack. They both list their benefits as “+x%”
So if you have +15, +8 & +7 that would give you a +30%

[Jaggid Edje]

Yes, they stack. But for the generic upgrades (the type you install from 'modules' which look like a piece of paper) you are limited to only 3 per tab (3 on the general inventory tab, 3 on the technology tab).
If you install a 4th one on a tab, they will all be disabled due to 'tech overload". This will show with them getting a red tint overlay and they will pulse, making it obvious which modules need to have one removed.

Don't confuse those with the upgrades that you install from blue prints (pressing the E key on an empty slot and installing the required ingredients). Those can also ALL always be installed, and do not cause tech overload.

[gerald2]

great thx vm,yes i got situation where one of mods was overloading ,thx for info folks .