When do wizard spells become per encounter instead of per rest?

[Aron Times]

I noticed, during my first run, that Aloth's lower level spells started recharging after every battle, and this was confirmed when I read about wizards on the unofficial wiki. The question is, at which level do wizard spells become per encounter instead of per rest? Also, which spell level and which character level correspond to each other when it comes to per encounter casting?

 

Thanks in advance for your replies!

[Sancus]

Level 9 for spell level 1, and level 11 for spell level 2.

[draek]

Level 9 for spell level 1, and level 11 for spell level 2.

 

I honestly was not expecting so high. I was hoping it was only 3 level difference not 8.

[Parsong]

4 levels too high. Sawyer'd