Continuing from the other thread.
Any girl in the team (including helper party) who will be entering the whaleship map will increase the solar gauge bar.
So it would be wise to fill your party 7/8 with 5* gauge buffers if necessary.
Shine panel girls can be used as well, but those panels spawn before the first enemy node so it's only useful when you're trying to complete the map the first time rather than farming.