Nova blast need charging?

Such is not explicitly stated, so maybe, maybe not. I believe this preference is up to your own opinion. As for me I believe that Nova blasts have the same range and power no matter the place, the probability that Gali’s nova blast most likely being more than Jaller’s is due to A. Being on an island near an ocean and B. Jaller is underwater, it’s been said that he already had a hard enough time using his element as is, and releasing a nova blast in his current situation would dampen its range, so probably when he’s on Metru nui it would probably destroy the city seeing as he’s now on land. Another reason is that the great being’s probably wouldn’t make the Toa that powerful…or maybe they would…maybe that’s why the marender exists…who’s to say?

Edit: little thing I forgot to say but Odina is bigger than metru nui and so by that logic we can probably assume that the normal range for a nova blast (while drawing power from an outside source) will probably affect the area of something the size of Odina.

Edit 2: I think it’s already been said that beings inside the gsr can act and use their powers without outside limitations, I also believe that toa can also control the size of a nova blast.