Applying a 'Powered Armor' template to existing Heavy Armors

[Ithnaar]

With only two combat-dedicated suits of Powered Armor available, getting that feat or proficiency isn't too exciting, as you'll be spending a lot of levels with gear that is much lower Level than your CR. So I came up with a reasonably simple system for upgrading any suit of Heavy Armor into Powered Armor.

1. Select base Heavy Armor from list.

2. Determine Powered Armor Size And Weapon/Armor Upgrade slots:
Total Slots = Heavy Armor Upgrade Slots - 1 (minimum 2)
Medium Size if Total Slots = 2 or 3
Large Size if Total Slots = 4 or 5
Huge Size if Total Slots = 6+
A Huge suit may be converted to Large size by reducing total slots to 5.
A Large suit may be converted to Medium size by reducing total slots to 3.
You cannot convert a smaller suit into a larger one.

Allocate Total Slots amongst Weapon Slots and Armor Upgrade Slots.
Both Weapon Slots and Armor Upgrade Slots have a minimum value of 1.

3. Cost = Heavy Armor cost x 1.2

4. AC Modifications:
Medium Size : EAC +1, KAC +2
Large Size : EAC -1, KAC +2
Huge Size : EAC -3, KAC +2

5. Speed : Reduce penalty by 5 if Medium Size (cannot go above zero), Increase penalty by 5 if Huge Size .

6. No Max Dex change.

7. Armor Check Penalty increases by 2 (gets worse).

8. Strength = (Level +13) if Medium Size, (Level +14) if Large, (Level +15) if Huge.

9. Damage = Die or dice whose average is (Level / 3) +4

10. Power Consumption :
Medium Size : (Level /5) = Charges per Hour
Large Size : (Level x 4) = Charges per Hour
Huge Size : (Level x 6) = Charges per Hour

11. Bulk = (Level x 2) +10 if Medium Size, (Level x 2) +13 if Large, (Level x 2) +18 if Huge.

It's certainly not a perfect system (Lashunta Ringwear V ends up being quite the bargain over the Jarlslayer), but it is simple and easy to use, and at the very least might serve as a guideline to build your own system from.

[Kalebon]

What would the Capacity of charges that it can hold Would be?

If you are taking suggestions a flat Level x5 would work for all sizes.

[Ithnaar]

With the level 5 Battle Harness having a capacity of 20 hours and the level 15 Jarlslayer having one of just under two hours, I'd probably eyeball it and shoot for something like:

Medium Size : As many as it takes to give up to 20 hours of power.

Large Size : As many as it takes to give about 2 hours of power.

Huge Size : As many as it takes to give about 1.5 hours of power.