diff --git a/backend/services/telemetry_collector.py b/backend/services/telemetry_collector.py
index 1adcfaa..735a33c 100644
--- a/backend/services/telemetry_collector.py
+++ b/backend/services/telemetry_collector.py
@@ -499,6 +499,118 @@ async def poll_loxone_sensors(site_id: int, db: asyncpg.Connection) -> None:
             )
 
 
+#: presence poll pacing (sekundy) a geofence poloměr (m)
+EV_PRESENCE_POLL_S = 300
+EV_PRESENCE_HOME_RADIUS_M = 150
+#: anti-spam "píchni auto": min. rozestup notifikací per vozidlo (s)
+EV_PLUG_NUDGE_COOLDOWN_S = 2 * 3600
+_EV_PRESENCE_LAST_POLL: dict[int, float] = {}
+_EV_PLUG_NUDGE_LAST: dict[int, float] = {}
+
+
+def ev_presence_transition(prev_at_home: bool | None, new_at_home: bool | None) -> str | None:
+    """Čistá detekce přechodu: 'arrived' / 'left' / None (testovatelné)."""
+    if new_at_home is None or prev_at_home is None:
+        return None
+    if not prev_at_home and new_at_home:
+        return "arrived"
+    if prev_at_home and not new_at_home:
+        return "left"
+    return None
+
+
+async def poll_tesla_presence(site_id: int, db: asyncpg.Connection) -> None:
+    """Přítomnost vozidla: /vehicles state (nebudí) + při online poloha → geofence.
+
+    Přechod pryč→doma + nepíchnuté → Discord pobídka (s aktuálním přebytkem).
+    Vše se loguje do ev_presence_obs (budoucí dostupnostní statistika).
+    """
+    loop_now = asyncio.get_running_loop().time()
+    if loop_now - _EV_PRESENCE_LAST_POLL.get(site_id, 0.0) < EV_PRESENCE_POLL_S:
+        return
+    _EV_PRESENCE_LAST_POLL[site_id] = loop_now
+
+    veh = await db.fetchrow(
+        """
+        select v.id, v.vin, v.name, s.latitude, s.longitude
+        from ems.asset_vehicle v join ems.site s on s.id = v.site_id
+        where v.site_id = $1 and v.api_type = 'tesla' and v.active
+        order by v.id limit 1
+        """,
+        site_id,
+    )
+    if veh is None or veh["latitude"] is None:
+        return
+
+    from services.tesla_client import get_charge_state, get_vehicle_api_state, haversine_m
+
+    try:
+        api_state = await get_vehicle_api_state(db, veh["vin"])
+    except Exception as e:
+        logger.warning("Tesla presence: state poll failed: %s", e)
+        return
+    if api_state is None:
+        return
+
+    at_home = None
+    distance_m = None
+    charging_state = None
+    shift_state = None
+    if api_state == "online":
+        try:
+            st = await get_charge_state(db, veh["vin"])
+        except Exception as e:
+            logger.warning("Tesla presence: data read failed: %s", e)
+            st = None
+        if st is not None and st.get("latitude") is not None:
+            distance_m = int(
+                haversine_m(
+                    float(st["latitude"]), float(st["longitude"]),
+                    float(veh["latitude"]), float(veh["longitude"]),
+                )
+            )
+            at_home = distance_m <= EV_PRESENCE_HOME_RADIUS_M
+            charging_state = st.get("charging_state")
+            shift_state = st.get("shift_state")
+
+    prev = await db.fetchrow(
+        """
+        select at_home from ems.ev_presence_obs
+        where vehicle_id = $1 and at_home is not null
+        order by observed_at desc limit 1
+        """,
+        int(veh["id"]),
+    )
+    await db.execute(
+        """
+        insert into ems.ev_presence_obs
+          (vehicle_id, api_state, at_home, distance_m, charging_state, shift_state)
+        values ($1, $2, $3, $4, $5, $6)
+        """,
+        int(veh["id"]), api_state, at_home, distance_m, charging_state, shift_state,
+    )
+
+    trans = ev_presence_transition(prev["at_home"] if prev else None, at_home)
+    if trans == "arrived" and charging_state == "Disconnected":
+        if loop_now - _EV_PLUG_NUDGE_LAST.get(int(veh["id"]), 0.0) < EV_PLUG_NUDGE_COOLDOWN_S:
+            return
+        _EV_PLUG_NUDGE_LAST[int(veh["id"])] = loop_now
+        grid_w = await db.fetchval(
+            "select grid_power_w from ems.vw_latest_inverter where site_id = $1 limit 1",
+            site_id,
+        )
+        surplus = f" — právě teče {abs(int(grid_w))/1000:.1f} kW do sítě" if grid_w and grid_w < -500 else ""
+        from services.notification_service import send_discord
+
+        await send_discord(
+            db, site_id,
+            f"🚗 **{veh['name'] or 'EV'} je doma a nepíchnuté**{surplus}.\n"
+            f"Píchni ho a plán se o zbytek postará (přebytky / levné sloty).",
+            level="info",
+        )
+        logger.info("EV plug nudge sent (site=%s, vehicle=%s)", site_id, veh["id"])
+
+
 async def run_telemetry_loop(conn: asyncpg.Connection) -> float:
     """Jeden průchod smyčky; vrátí uplynulý čas v sekundách (pro sleep).
 
@@ -516,6 +628,7 @@ async def run_telemetry_loop(conn: asyncpg.Connection) -> float:
             await poll_ev_chargers(sid, conn)
             await poll_heat_pump(sid, conn)
             await poll_loxone_sensors(sid, conn)
+            await poll_tesla_presence(sid, conn)
             await poll_pool_pumps(sid, conn)
         except Exception as e:
             logger.error("Telemetry loop error site %s: %s", sid, e)
diff --git a/backend/services/tesla_client.py b/backend/services/tesla_client.py
index ae5dca2..1b77b1e 100644
--- a/backend/services/tesla_client.py
+++ b/backend/services/tesla_client.py
@@ -166,3 +166,33 @@ async def get_charge_state(
             return None
         r.raise_for_status()
         return parse_charge_state(r.json())
+
+
+def haversine_m(lat1: float, lon1: float, lat2: float, lon2: float) -> float:
+    """Vzdálenost dvou GPS bodů v metrech (čisté, testovatelné)."""
+    import math
+
+    r = 6_371_000.0
+    p1, p2 = math.radians(lat1), math.radians(lat2)
+    dp = math.radians(lat2 - lat1)
+    dl = math.radians(lon2 - lon1)
+    a = math.sin(dp / 2) ** 2 + math.cos(p1) * math.cos(p2) * math.sin(dl / 2) ** 2
+    return 2 * r * math.asin(math.sqrt(a))
+
+
+async def get_vehicle_api_state(db: asyncpg.Connection, vin: str | None) -> str | None:
+    """Jen state z /vehicles (online/asleep/offline) — NIKDY nebudí auto."""
+    token = await _get_access_token(db)
+    if token is None:
+        return None
+    async with httpx.AsyncClient(
+        timeout=HTTP_TIMEOUT_S, headers={"Authorization": f"Bearer {token}"}
+    ) as client:
+        r = await client.get(f"{API_BASE}/api/1/vehicles")
+        r.raise_for_status()
+        vehicles = r.json().get("response") or []
+        if vin:
+            v = next((x for x in vehicles if x.get("vin") == vin), None)
+        else:
+            v = vehicles[0] if len(vehicles) == 1 else None
+        return str(v["state"]) if v else None
diff --git a/backend/tests/test_ev_presence.py b/backend/tests/test_ev_presence.py
new file mode 100644
index 0000000..01f57e5
--- /dev/null
+++ b/backend/tests/test_ev_presence.py
@@ -0,0 +1,41 @@
+"""EV presence — čisté helpery (haversine, přechody)."""
+
+from __future__ import annotations
+
+import unittest
+
+from services.telemetry_collector import ev_presence_transition
+from services.tesla_client import haversine_m
+
+
+class HaversineTests(unittest.TestCase):
+    def test_zero_distance(self) -> None:
+        self.assertAlmostEqual(haversine_m(49.2445, 17.4070, 49.2445, 17.4070), 0.0, places=2)
+
+    def test_known_distance(self) -> None:
+        # ~111 km na 1° zeměpisné šířky
+        d = haversine_m(49.0, 17.0, 50.0, 17.0)
+        self.assertAlmostEqual(d, 111_195, delta=300)
+
+    def test_geofence_scale(self) -> None:
+        # ~100 m posun (0.0009° lat)
+        d = haversine_m(49.24457, 17.407054, 49.24547, 17.407054)
+        self.assertTrue(80 < d < 120, d)
+
+
+class TransitionTests(unittest.TestCase):
+    def test_arrived(self) -> None:
+        self.assertEqual(ev_presence_transition(False, True), "arrived")
+
+    def test_left(self) -> None:
+        self.assertEqual(ev_presence_transition(True, False), "left")
+
+    def test_none_cases(self) -> None:
+        self.assertIsNone(ev_presence_transition(None, True))
+        self.assertIsNone(ev_presence_transition(True, None))
+        self.assertIsNone(ev_presence_transition(True, True))
+        self.assertIsNone(ev_presence_transition(False, False))
+
+
+if __name__ == "__main__":
+    unittest.main()
diff --git a/db/migration/V095__ev_presence.sql b/db/migration/V095__ev_presence.sql
new file mode 100644
index 0000000..868f1ec
--- /dev/null
+++ b/db/migration/V095__ev_presence.sql
@@ -0,0 +1,22 @@
+-- Presence vozidla (Tesla location scope): kde auto je, kdy bývá doma.
+-- Zdroj: levný poll /vehicles (state, NEbudí) + při online location_data.
+-- Účel: (a) notifikace "auto doma a nepíchlé + svítí přebytek → píchni ho",
+-- (b) dostupnostní statistika per DOW×hodina pro plánovač (maska ev_connected
+-- a zreálnění oportunistické hodnoty) — follow-up nad těmito daty.
+
+create table ems.ev_presence_obs (
+  id bigserial primary key,
+  vehicle_id int not null references ems.asset_vehicle (id),
+  observed_at timestamptz not null default now(),
+  api_state text,            -- online / asleep / offline (z /vehicles, bez buzení)
+  at_home boolean,           -- null = poloha neznámá (asleep)
+  distance_m int,
+  charging_state text,       -- Disconnected / Stopped / Charging…
+  shift_state text
+);
+
+create index idx_ev_presence_obs_vehicle_time
+  on ems.ev_presence_obs (vehicle_id, observed_at desc);
+
+comment on table ems.ev_presence_obs is
+'Pozorování přítomnosti vozidla (geofence vs GPS site). Poll ~5 min, poloha jen když je auto vzhůru (nebudí). Vstup pro "píchni auto" notifikace a budoucí dostupnostní statistiku.';
diff --git a/docs/tesla-fleet-api.md b/docs/tesla-fleet-api.md
index 8ec072b..a47ab57 100644
--- a/docs/tesla-fleet-api.md
+++ b/docs/tesla-fleet-api.md
@@ -101,3 +101,20 @@ curl -s https://fleet-auth.prd.vn.cloud.tesla.com/oauth2/v3/token \
   /opt/ems-deploy/.env up -d backend` (recreate kvůli env)
 - [ ] ověření: po příjezdu Tesly log `Tesla SoC -> session …` +
   `select soc_at_connect_pct, target_soc_pct from ems.ev_session order by id desc limit 1`
+
+## Presence watcher (2026-06-12, dev)
+
+Poll ~5 min: `GET /vehicles` (state, NEBUDÍ) → při `online` poloha
+(`location_data`, vyžaduje scope `vehicle_location`) → geofence 150 m vs GPS
+site → `ems.ev_presence_obs` (V095). Přechod pryč→doma + `Disconnected` →
+Discord pobídka „auto doma a nepíchnuté (+aktuální přebytek)“; cooldown 2 h.
+Data = základ dostupnostní statistiky per DOW×hodina (follow-up: maska
+ev_connected v plánovači + zreálnění oportunistické hodnoty).
+
+### Zákopy z reauth (12. 6.) — ať se neopakují
+1. redirect URI `/t-auth` (musí sedět všude), 2. refresh token ROTUJE →
+provozní hodnota v `ems.tesla_token` (ne .env), 3. po revokaci souhlasu ~10 min
+výpadek auth, 4. `client_not_found` = app smazána/nové ID → opravit .env +
+recreate, 5. **public key hash je vázán na app** — po smazání app nutná rotace
+klíče (`mv private.pem .old` + `setup_tesla_domain.sh`) před partner registrací,
+6. prázdný seznam vozidel = chybí partner registrace (ne spánek).