OPT-36 round 4: count only charge control will make; Solar first drain at the night base

Review F1: a slot after B's run counts only if no slot from the expensive
hours on is cheaper (control plans B's charge left in the cheapest window
ahead), and x 0.95 of B's charge is stored. Three-price night: 1ac7fe9 left
the expensive hours 2.61 kWh short; now 0.
Review F2: a Solar first battery's drain until the expensive hours reads each
hour at no less than the night base (the profile is net of the sun). Read net,
a dark morning drained the battery the plan still counted; A's level fell,
the cheap run moved and was lost before it started (+0.40 EUR per 3 days).
The two real-price replays now cost what 0.20.0 does.
F3: the ux54 sweep's peak limit is 15 kW (the option's top). F4: the rest
comes from the grid (EN/NL). F5: CHANGELOG and DECISIONS wording.

Co-Authored-By: Claude <noreply@anthropic.com>

goodwe_controller/DECISIONS/OPT-23-28-the-night-charge-covers-the-dear-hours.md

@@ -6,7 +6,7 @@
 
 - **Shortfall.** `sum_h max(0, house_h - trust x sun_h)` over every expensive hour, `/ EFF`, from the floor. It replaces the use over the run with no sun counted, which on a day and night tariff bought for the whole day (G1, `reports/UX-69-design-report.md`). The sun before the run is unchanged. A run with its dear hours after sunset gives the old number.
 - **House use.** An hour with sun is read at no less than the night base, as the sun sum reads it (the profile is net of the sun). An hour without is read as measured. An hour with no forecast counts no sun.
-- **Several batteries.** One total, shared by capacity with the ceiling passed on (`dayplan._spread()`). With the same floor and ceiling for all, they reach the ceiling together, so a shortfall that one battery cannot hold fills both to the same level, not one first. More than all hold: all go to the ceiling, `Plan.uncovered_kwh` is the rest, carried by another battery (Cheap hours, Solar first) or the grid, as the screen says.
+- **Several batteries.** One total, shared by capacity with the ceiling passed on (`dayplan._spread()`). With the same floor and ceiling for all, they reach the ceiling together, so a shortfall that one battery cannot hold fills both to the same level, not one first. More than all hold: all go to the ceiling, `Plan.uncovered_kwh` is the rest, carried by the grid (OPT-36 counts the other batteries first), as the screen says.
 - **Cheap hours** still fills up; **Solar first** still never charges from the grid. The mode help says so.
-- **OPT-36 (0.20.1):** what Cheap hours batteries will give in the expensive hours is taken off the shortfall before Leftover solar shares it (`dayplan._cheap_give_kwh()`: its level when they start, the ceiling or what it charges under the peak aim in the cheap run and the later slots still worth charging in, minus the floor, x capacity x EFF; the run alone, sized at the ratings, let A's level fall after A had bought). Owner, 2026-11-02: Solar first batteries count too (`_solar_first_give_kwh()`): their level now less the house's night use until the hours start, shared by the energy held, then the same sum; a battery the night drains to the floor counts 0. Live, 2026-11-02: A at 60 % went to 95 % while B at 94 % covered the hours. Test: `test_opt36.py`.
-- **Not done:** the run length (OPT-25).
+- **OPT-36 (0.20.1):** Cheap hours and Solar first batteries give first; Leftover solar shares only the rest of the shortfall (`dayplan._cheap_give_kwh()`, `_solar_first_give_kwh()`). A Cheap hours battery counts the level its charge reaches: the cheap run, then later slots still worth charging in and no dearer than any slot from the expensive hours on, under the peak aim, x EFF stored. A Solar first battery counts what is left after the house's use until the hours start, each hour at no less than the night base. Live, 2026-11-02: A at 60 % went to 95 % while B at 94 % covered the hours. Owner, 2026-11-02: Solar first counts too. Test: `test_opt36.py`.
+- **Not done:** the run length (OPT-25). On a dynamic tariff the Cheap hours count guesses where control will charge; a counted slot can still go unused, and that gap comes from the grid.