diff --git a/goodwe_controller/app/main.py b/goodwe_controller/app/main.py
index 97985f1..3eda31b 100644
--- a/goodwe_controller/app/main.py
+++ b/goodwe_controller/app/main.py
@@ -91,7 +91,7 @@ from .price import Absence, Uncertainty, brussels, price_option, provider_config
 from .price import required_spread as price_required_spread
 from .price import uncertainty_of as price_uncertainty_of
 from .price_history import PriceHistory
-from .static_tariff import resolve_tariff, static_status
+from .static_tariff import resolve_tariff, static_gated, static_status
 from .tariff import PeakStore, PeakTracker, next_quarter
 from .store import migrate_maint_keys, migrate_unit_keys
 from .validate import (FIRMWARE_INGEST_VETO_S, ConfigRefused, refuse,
@@ -1188,6 +1188,7 @@ class Controller:
         self.grid = None
         self.peak_fc = None
         self.cheap = False
+        self._price_gated = False     # MAINT-13: is a price gate set up
         # TARIFF-03. One line of prose for the status page saying WHICH tariff
         # window we are in and why it is or is not cheap - so "Cheap window:
         # no" is an evidenced answer rather than a bare no.
@@ -3312,6 +3313,7 @@ class Controller:
             now_p = await self.hass.number(now_e)
             avg_p = await self.hass.number(avg_e)
             self.cheap = (now_p is not None and avg_p is not None and now_p <= avg_p)
+            self._price_gated = True
             self.tariff_words = "Prices from Home Assistant entities"
         else:
             # TARIFF-03. §9.2 makes a static day/night tariff a first-class
@@ -3337,6 +3339,7 @@ class Controller:
             # one and the loser is silent.
             self.cheap, self.tariff_words = static_status(
                 o, datetime.now(timezone.utc))
+            self._price_gated = static_gated(o, datetime.now(timezone.utc))
 
         # ⚠️ TARIFF-11. THE PROVIDER PLAN REACHES THE *Tariff* ROW HERE, AND
         # THIS IS THE ONLY PLACE THE TWO SOURCES MEET. Everything above is the
@@ -3883,10 +3886,7 @@ class Controller:
         really taking charge (sun outside cheap hours). Closed only when a gate
         exists, it is shut, and the pack is not charging.
         """
-        o = self.o
-        gated = bool((o.get("price_now_entity") and o.get("price_avg_entity"))
-                     or o.get("static_profile"))
-        if not gated or self.cheap:
+        if not self._price_gated or self.cheap:
             return True
         batt = inv.batt
         return batt is not None and float(batt) <= -MAINT_CHARGING_W
diff --git a/goodwe_controller/app/static_tariff.py b/goodwe_controller/app/static_tariff.py
index fc6659b..aa838c2 100644
--- a/goodwe_controller/app/static_tariff.py
+++ b/goodwe_controller/app/static_tariff.py
@@ -1232,6 +1232,16 @@ def static_plan(opts: dict, since: datetime, until: datetime, *,
         profile, "fallback" if provisional else "static")
 
 
+def static_gated(opts: dict, now: datetime) -> bool:
+    """MAINT-13: is a fixed tariff set up, so that a cheap window can hold a
+    charge back? False for no profile or one that cannot be used."""
+    try:
+        return bool(static_plan(opts, now, now + timedelta(days=MEAN_WINDOW_DAYS),
+                                now=now).has_prices)
+    except ProfileInvalid:
+        return False
+
+
 def static_status(opts: dict, now: datetime):
     """(cheap, words) for the status page and for main.py's cheap-window flag.
 
diff --git a/goodwe_controller/test_maint13.py b/goodwe_controller/test_maint13.py
index 7cad14d..505c13a 100644
--- a/goodwe_controller/test_maint13.py
+++ b/goodwe_controller/test_maint13.py
@@ -454,7 +454,12 @@ m = put_in_charge(c, 0, 40, CHARGE_TIMEOUT_MIN + 1)
 one_cycle(c)
 check("...and a pack past its charging time there fails at once (not 7 days)",
       m.phase == IDLE and len(notes(h)) == 1)
+def read(c):
+    asyncio.run(c.read_inputs())
+
+
 c, h = controller(OPTS1, False)
+read(c)
 c.inverters[0].batt = -800.0
 check("price gate closed but the pack is taking 800 W (sun): gate open",
       c._charge_gate_open(c.inverters[0]) is True)
@@ -464,11 +469,20 @@ check("...closed and about idle: gate closed",
 c.inverters[0].batt = None
 check("...no battery reading: gate closed", c._charge_gate_open(c.inverters[0]) is False)
 c, h = controller(OPTS1, True)
-c.cheap = True
+read(c)
 check("price gate open: gate open", c._charge_gate_open(c.inverters[0]) is True)
-c, h = controller(dict(NOTARIFF, static_profile="x"), False)
-check("a fixed tariff set up counts as a gate (closed outside its cheap hours)",
-      c._charge_gate_open(c.inverters[0]) is False)
+PROFILE = json.dumps({"periods": [
+    {"name": "day", "from": "07:00", "to": "22:00", "days": "all",
+     "eur_per_kwh": 0.29},
+    {"name": "night", "from": "22:00", "to": "07:00", "days": "all",
+     "eur_per_kwh": 0.19}]})
+c, h = controller(dict(NOTARIFF, price_provider="off", static_profile=PROFILE),
+                  False)
+read(c)
+check("a fixed tariff set up counts as a gate: outside its cheap hours a pack "
+      "that is not charging is closed, inside them it is open",
+      c._price_gated is True
+      and c._charge_gate_open(c.inverters[0]) is c.cheap)
 
 # the save timer is reset on a phase change
 mm = in_charge()