Early and Late TL9

[weby]

Next power:

Power cells: As described: will require much development in super capacitors or similar. In early TL 8+1 at least we will most likely see Secondary Batteries as the primary energy storage method. Late TL 8+1, who knows what we will have by then.

Fission Generators: Technically possible today , so definitely technically possible at early TL 8+1 and if there is a need they could be produced, but such small nuclear powerplants are extremely unlikely due to political/environmental concerns. So this is not technical limited, but otherwise so no idea when and if such will happen.

Solar Power Array: a 400 square feet array is a perfectly reasonable size for a off-grid array, and would be maybe 8kw nominal today and might weight 1500-3000 lb with the stands. So a 500lb kit could easily be not too far future so call it early 8+1 but edging towards middle TL 8+1.

Solar Paint: this is more likely late TL 8+1 or later as it requires some fundamental technology developments.