Power Armour Encumbrance

I am somewhat confused about power armor encumbrance in DH2e and whether or not the weight of the armor is actually counted against your encumbrance value. The following sentence is from page 168 and feels like it could be referring to either the armor or just the power supply.

"Light power armour requires a constant power supply, normally built into the suit, which offsets its weight so it does not count against the user’s normal carrying limit (see page 248)."

Currently asking this since I am making a Sister of Battle character right now and the power armor she gets is eating up basically all of my encumbrance limit, which feels wrong, On the other hand I could see this being a balancing issue where the armor weighs a lot to prevent it from being too powerful.