[Yinikren]

Maurk hit the nail on the head.

ENC's are fairly gear dependant, as you will be taking hits often, so having a bigger HP/Mana pool will allow you to solo longer before having to med. I can charm solo at 20 and kill 6-8 mobs on a mana pool before I need to sit and med for 8 mins or so. Works better than the animations, because at these low levels, they are too much mana to keep up.

Charm soloing => Find pet, tash, charm = 80 mana.
Find target, Start killing. =>Tash, Choke, Root. 100 mana. Med.
Kill target, while pet is hopefully <10%. Kill pet with a low level nuke. 20-50 Mana.
Total mana spent = 200 on a good pull, before meditation is taken into account and without a charm break. I can reasonably expect to med up 80-100 mana per pull, so the total cost was 100 mana. This is at 20.

Animation Soloing => Summon highest animation for your level. (White at 20. Hits for 22. Give it an offhand wep.) Med to full.
Buffs => Cloud, Quickness. 110 Mana.
Pull a mob with Tash, Slow, Choke, Root. 150 Mana.
Watch HP, because pet needs to regen. So you usually need to nuke the mob dead before it kills your pet. 45-150 Mana.
=> Med and rehaste, because it only lasts 5 minutes. 80 mana.

Charming is much, much easier at these levels.