From 92857a27a0fadc12853f12d2f1aa5ec39d9c2e84 Mon Sep 17 00:00:00 2001
From: Codex Agent <codex@example.com>
Date: Sat, 22 Nov 2025 23:23:06 +0100
Subject: [PATCH] Show generator battery output and slow idle drain

---
 src/reactor_sim/dashboard.py | 2 +-
 src/reactor_sim/generator.py | 7 +++++--
 2 files changed, 6 insertions(+), 3 deletions(-)

diff --git a/src/reactor_sim/dashboard.py b/src/reactor_sim/dashboard.py
index 285fecf..8736048 100644
--- a/src/reactor_sim/dashboard.py
+++ b/src/reactor_sim/dashboard.py
@@ -565,7 +565,7 @@ class ReactorDashboard:
             status = "RUN" if gen.running else "START" if gen.starting else "OFF"
             spool = f" spool {gen.spool_remaining:4.1f}s" if gen.starting else ""
             lines.append((f"Gen{idx + 1}", f"{status} {gen.power_output_mw:6.1f}/{self.reactor.generators[idx].rated_output_mw:4.0f} MW{spool}"))
-            lines.append((f"  Battery", f"{gen.battery_charge*100:5.1f}%"))
+            lines.append((f"  Battery", f"{gen.battery_charge*100:5.1f}% out {gen.battery_output_mw:4.1f} MW"))
         return lines
 
     def _power_lines(self, state: PlantState) -> list[tuple[str, str]]:
diff --git a/src/reactor_sim/generator.py b/src/reactor_sim/generator.py
index 39bb023..5ec7685 100644
--- a/src/reactor_sim/generator.py
+++ b/src/reactor_sim/generator.py
@@ -18,6 +18,7 @@ class GeneratorState:
     power_output_mw: float
     battery_charge: float
     status: str = "OFF"
+    battery_output_mw: float = 0.0
 
 
 @dataclass
@@ -48,9 +49,11 @@ class DieselGenerator:
 
     def step(self, state: GeneratorState, load_demand_mw: float, dt: float) -> float:
         """Advance generator dynamics and return delivered power."""
+        state.battery_output_mw = 0.0
         if state.starting:
             state.spool_remaining = max(0.0, state.spool_remaining - dt)
             state.power_output_mw = self.rated_output_mw * (1.0 - state.spool_remaining / max(self.spool_time, 1e-6))
+            state.battery_output_mw = min(0.5, load_demand_mw)
             if state.spool_remaining <= 0.0:
                 state.starting = False
                 state.running = True
@@ -67,8 +70,8 @@ class DieselGenerator:
         if state.running:
             state.battery_charge = min(1.0, state.battery_charge + 0.02 * dt)
         elif state.starting:
-            state.battery_charge = max(0.0, state.battery_charge - 0.01 * dt)
+            state.battery_charge = max(0.0, state.battery_charge - 0.003 * dt)
         else:
-            state.battery_charge = max(0.0, state.battery_charge - 0.001 * dt)
+            state.battery_charge = max(0.0, state.battery_charge - 0.00005 * dt)
 
         return state.power_output_mw