I would say Solar Team is a solid style but needs way too much investment to be effective. You will want a full team of girls lvl120, full high ampules, 300% affection and five lvl50 Solar Blast FM.
Imho Mimosa is a must have. And Cyclamen (Flower Knight of the Seven Flowers) too. And as much Guts/Negate damage as possible to get as much 100% Sun Damage after Cyclamen Skill.
Actually, I think Solar Blast can be really powerfull but looks like a whale privilege. Like, if you're really a worthy player, you can use your special attack at full potential.