Stacking Droid Modules

The relationship between rating and storage is not always 1 for 1

Droid Armor, Item Storage and Data Storage can be stacked to produce a higher rating. The following is a chart of how all stackable modules relate to each other:

Module                     Armor
Level  Rating   Items Data   Eff
| 1  | 1 - 2   |  1  | 20  | 1000 |
| 2  | 3 - 4   |  2  | 40  | 2000 |
| 3  | 5 - 6   |  4  | 70  | 3000 |
| 4  | 7 - 8   |  6  | 110 | 4000 |
| 5  | 9 - 10  |  8  | 125 | 5000 |
| 6  | 11 +    |  10 | 150 | 6000 |

The next part is for storage modules only:

| 7  | 13 - 15 |  10 |
| -  | 16 - 20 |  15 |
| -  | 21 - 25 |  20 |
| -  | 26 - 29 |  25 |
| -  | 30+     |  30 |

Power droids can only take one module and the most item storage you can get from a single module is 10 - use a single capped level 6. The maximum item storage is 30, so one could stack three capped level 6's or two level 7's to achieve a 30 item storage on a droid.