Ditto that on the solar collectors. Since they even work when cloaked, and simply being cloaked doesn't seem to use up supply (although you do need to have at least 1 unit or cloak drops...), you end up needing a LOT fewer ships on rotation as you can simply cloak and recharge, instead of returning to friendly space.
That is, until your enemies research good-enough sensors.
Also Stellar Harnessing eventually gives you solar sails, which are seriously
good juju. Mmmm, DNs with speed 11/6, BCs at 13/7 (prop exp).
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-- The thing that goes bump in the night