The bar is a ramp of vertical slashes that grow taller left to right. The far-right slash is your rig's clear-sky peak (3.3 kW = 100%). This hour's output lights the slashes up from the left; the unlit ghosts beyond show how much of your potential is still on the table.
Height is the meaning. The slashes ramp up left to right, so the shape alone tells you the scale. The lit extent is this hour's output as a fraction of the rig's clear-sky ceiling. Lit slashes are full gold; everything past the current level is a dim ghost, still drawn so the scale never disappears.
Two non-color cues carry everything: the height ramp and the lit-vs-ghost extent. The gold (#FFB81C) and the cool dim at the low end only reinforce. Cover the color and the meter still reads.
Peak ceiling 3.3 kW is the tallest, far-right slash. This hour shows 1.8 kW, about 55% of the ceiling. The hero reads 10.4 kWh today: a real small-rig day, never an 18+ kWh figure that would imply a much bigger array.
Each slash is one rounded rect. In the app this is react-native-svg rects plus one reanimated shared value driving the lit count, the same fill-on-mount motion the current bar already uses. No per-frame JS.