diff --git a/apps/predbat/components.py b/apps/predbat/components.py
index 9e7835290..7c4a6db9d 100644
--- a/apps/predbat/components.py
+++ b/apps/predbat/components.py
@@ -123,9 +123,9 @@ def load_component_class(component_info):
             "solcast_host": {"required": False, "config": "solcast_host", "default": "https://api.solcast.com.au/"},
             "solcast_api_key": {"required": False, "secret": True, "config": "solcast_api_key"},
             "solcast_sites": {"required": False, "config": "solcast_sites"},
-            "solcast_poll_hours": {"required": False, "config": "solcast_poll_hours", "default": 8},
+            "solcast_poll_hours": {"required": False, "config": "solcast_poll_hours", "default": 8.0},
             "forecast_solar": {"required": False, "config": "forecast_solar", "default": False},
-            "forecast_solar_max_age": {"required": False, "config": "forecast_solar_max_age", "default": 8},
+            "forecast_solar_max_age": {"required": False, "config": "forecast_solar_max_age", "default": 8.0},
             "forecast_solar_open_meteo_backup": {"required": False, "config": "forecast_solar_open_meteo_backup", "default": False},
             "forecast_solar_open_meteo_first": {"required": False, "config": "forecast_solar_open_meteo_first", "default": False},
             "pv_forecast_today": {"required": False, "config": "pv_forecast_today"},
@@ -134,7 +134,7 @@ def load_component_class(component_info):
             "pv_forecast_d4": {"required": False, "config": "pv_forecast_d4"},
             "pv_scaling": {"required": False, "config": "pv_scaling", "default": 1.0},
             "open_meteo_forecast": {"required": False, "config": "open_meteo_forecast", "default": False},
-            "open_meteo_forecast_max_age": {"required": False, "config": "open_meteo_forecast_max_age", "default": 4},
+            "open_meteo_forecast_max_age": {"required": False, "config": "open_meteo_forecast_max_age", "default": 4.0},
         },
         "required_or": ["solcast_api_key", "forecast_solar", "pv_forecast_today", "open_meteo_forecast"],
         "phase": 2,  # Solar component moved to phase 2 so that any Predbat cloud components (such as GEcloud) have been started and initialised pv_today, etc
@@ -458,7 +458,7 @@ def load_component_class(component_info):
             # one from, so it is estimated from poinv. This is the escape hatch for a user
             # who knows their pack's real limit.
             "battery_rate_max": {"required": False, "config": "alphaess_battery_rate_max"},
-            "api_delay": {"required": False, "default": 2, "config": "alphaess_api_delay"},
+            "api_delay": {"required": False, "default": 2.0, "config": "alphaess_api_delay"},
             "min_write_interval": {"required": False, "default": 300, "config": "alphaess_min_write_interval"},
         },
         # Gate activation on having an AppID. Without this the component would start for
@@ -605,7 +605,7 @@ def load_component_class(component_info):
         "event_filter": "predbat_axle_",
         "args": {
             "api_key": {"required": False, "secret": True, "config": "axle_api_key"},
-            "pence_per_kwh": {"required": False, "config": "axle_pence_per_kwh", "default": 100},
+            "pence_per_kwh": {"required": False, "config": "axle_pence_per_kwh", "default": 100.0},
             "automatic": {"required": False, "config": "axle_automatic", "default": True},
             "managed_mode": {"required": False, "config": "axle_managed_mode", "default": False},
             "site_id": {"required": False, "secret": True, "config": "axle_site_id"},
diff --git a/apps/predbat/octopus.py b/apps/predbat/octopus.py
index bbb79a5a6..64cc3b6c7 100644
--- a/apps/predbat/octopus.py
+++ b/apps/predbat/octopus.py
@@ -1323,7 +1323,7 @@ def get_saving_session_data(self):
         # Default saving session rate in octopoints/kWh
         # octopus_saving_session_rate is in p/kWh, convert to octopoints
         octopoints_per_penny = self.get_arg("octopus_saving_session_octopoints_per_penny", 8)
-        default_rate_pence = self.get_arg("octopus_saving_session_rate", 100)  # 100p/kWh default
+        default_rate_pence = self.get_arg("octopus_saving_session_rate", 100.0)  # 100p/kWh default
         default_octopoints = default_rate_pence * octopoints_per_penny
 
         if not has_joined:
@@ -4212,7 +4212,7 @@ def fetch_octopus_sessions(self, axle_sessions=None):
         if "octopus_saving_session" in self.args:
             saving_rate = 200  # Default rate if not reported
             octopoints_per_penny = self.get_arg("octopus_saving_session_octopoints_per_penny", 8)  # Default 8 octopoints per penny
-            octopoints_min_threshold = self.get_arg("octopus_saving_session_min_octopoints_per_kwh", 0)
+            octopoints_min_threshold = self.get_arg("octopus_saving_session_min_octopoints_per_kwh", 0.0)
             join_lead_hours = self.get_arg("octopus_saving_auto_join_lead_hours", 0)
 
             joined_events = []
@@ -4327,7 +4327,7 @@ def fetch_octopus_sessions(self, axle_sessions=None):
 
             # Default saving session rate for when octopoints_per_kwh is not available
             # (e.g. new flexibility API events that don't report reward rates)
-            default_rate_pence = self.get_arg("octopus_saving_session_rate", 0)
+            default_rate_pence = self.get_arg("octopus_saving_session_rate", 0.0)
 
             if joined_events:
                 for event in joined_events:
diff --git a/apps/predbat/tests/test_integer_config.py b/apps/predbat/tests/test_integer_config.py
index 0aa8b5832..48174eb5c 100644
--- a/apps/predbat/tests/test_integer_config.py
+++ b/apps/predbat/tests/test_integer_config.py
@@ -478,3 +478,102 @@ def test_metric_battery_value_scaling_step_resolves_export_margin(my_predbat):
 
     print("✓ Test passed: metric_battery_value_scaling step {} keeps the first nudge ({:.4f}) clear of the {:.4f} flip point and keeps old 0.1-step values valid".format(step, first_nudge, flip_point))
     return False
+
+
+def _float_declared_keys():
+    """The APPS_SCHEMA keys whose declared type includes "float"."""
+    from config import APPS_SCHEMA
+
+    return {key for key, spec in APPS_SCHEMA.items() if "float" in str(spec.get("type", "")).split("|")}
+
+
+def test_float_declared_keys_never_read_with_int_default(my_predbat):
+    """
+    Guard for #4925: no call site may read a key APPS_SCHEMA declares "float" with a bare int literal default.
+
+    get_arg() coerces its return value on the *type* of the default it is handed and applies that to
+    whatever value was resolved, real configured value or not. So `get_arg("solcast_poll_hours", 8)`
+    ran a configured 4.8 through int(float(value)) and returned 4 - shortening the Solcast poll TTL
+    to 4h and pushing a two-site hobbyist account past its 10 poll/day quota. Nothing warned:
+    validate_config() checks the raw apps.yaml value against the float schema and passes it.
+
+    The fix is a float literal at each call site. This scans the source rather than asserting on
+    today's eight sites, so a new `get_arg("<float key>", 8)` or a COMPONENT_LIST spec with
+    `"default": 8` fails here instead of truncating in production. It sees literals only - a
+    default passed through a variable, or a key read through a wrapper accessor, is not checked.
+    """
+    print("**** test_float_declared_keys_never_read_with_int_default ****")
+    import ast
+    import glob
+    import os
+    import components
+
+    float_keys = _float_declared_keys()
+    source_dir = os.path.dirname(os.path.abspath(components.__file__))
+    offenders = []
+    scanned = 0
+    for path in sorted(glob.glob(os.path.join(source_dir, "*.py"))):
+        scanned += 1
+        with open(path, encoding="utf-8") as source:
+            tree = ast.parse(source.read())
+        for node in ast.walk(tree):
+            if isinstance(node, ast.Call) and getattr(node.func, "attr", getattr(node.func, "id", None)) == "get_arg" and node.args and isinstance(node.args[0], ast.Constant) and node.args[0].value in float_keys:
+                default = node.args[1] if len(node.args) > 1 else None
+                for keyword in node.keywords:
+                    if keyword.arg == "default":
+                        default = keyword.value
+                if isinstance(default, ast.Constant) and type(default.value) is int:
+                    offenders.append("{}:{} get_arg({!r}, {})".format(os.path.basename(path), node.lineno, node.args[0].value, default.value))
+            elif isinstance(node, ast.Dict):
+                keys = [key.value if isinstance(key, ast.Constant) else None for key in node.keys]
+                if "config" in keys and "default" in keys:
+                    config = node.values[keys.index("config")]
+                    default = node.values[keys.index("default")]
+                    if isinstance(config, ast.Constant) and config.value in float_keys and isinstance(default, ast.Constant) and type(default.value) is int:
+                        offenders.append("{}:{} arg spec {!r} default {}".format(os.path.basename(path), node.lineno, config.value, default.value))
+
+    assert scanned > 10 and float_keys, "Guard found nothing to scan ({} files, {} float keys) - has the layout changed?".format(scanned, len(float_keys))
+    assert not offenders, "Float-declared keys read with an int default, which truncates a configured fraction (#4925) - write e.g. 8.0: {}".format("; ".join(offenders))
+
+    print("✓ Test passed: {} float-declared keys, no int defaults across {} source files".format(len(float_keys), scanned))
+    return False
+
+
+def test_component_arg_specs_resolve_float_declared_keys_as_float(my_predbat):
+    """
+    Behavioural companion to the source guard above (#4925): every COMPONENT_LIST arg spec with a
+    default whose "config" key APPS_SCHEMA declares "float" must resolve a configured fraction
+    intact, resolved exactly the way Components.initialize() does
+    (`arg_dict[arg] = self.base.get_arg(arg_info["config"], default, indirect=indirect)`).
+    """
+    print("**** test_component_arg_specs_resolve_float_declared_keys_as_float ****")
+
+    from components import COMPONENT_LIST
+
+    float_keys = _float_declared_keys()
+    original_args = my_predbat.args.copy()
+    checked = []
+    try:
+        for component_name, component_info in COMPONENT_LIST.items():
+            for arg, arg_info in component_info.get("args", {}).items():
+                config_name = arg_info.get("config", None)
+                if not config_name or arg_info.get("config_late_resolve", False):
+                    continue
+                if config_name not in float_keys:
+                    continue
+                if arg_info.get("default", None) is None:
+                    # No default means no coercion, so there is nothing that could truncate
+                    continue
+
+                my_predbat.args[config_name] = 4.8
+                value = my_predbat.get_arg(config_name, arg_info.get("default", None), indirect=arg_info.get("indirect", False))
+                my_predbat.args.pop(config_name, None)
+                assert value == 4.8, "{}.{} ({}) resolved a configured 4.8 as {} ({}) - a float-declared key must not be truncated by its arg spec default".format(component_name, arg, config_name, value, type(value))
+                checked.append(config_name)
+    finally:
+        my_predbat.args = original_args
+
+    assert checked, "No float-declared component arg specs found to check - has APPS_SCHEMA or COMPONENT_LIST changed shape?"
+
+    print("✓ Test passed: {} float-declared component arg spec(s) resolve fractional values intact: {}".format(len(checked), ", ".join(sorted(set(checked)))))
+    return False
diff --git a/apps/predbat/unit_test.py b/apps/predbat/unit_test.py
index 0f3d5a499..89cfdaef7 100644
--- a/apps/predbat/unit_test.py
+++ b/apps/predbat/unit_test.py
@@ -254,6 +254,8 @@
     test_get_ha_config_normalises_int_default_for_fractional_step,
     test_metric_battery_cycle_fractional_value_not_truncated,
     test_metric_battery_value_scaling_step_resolves_export_margin,
+    test_float_declared_keys_never_read_with_int_default,
+    test_component_arg_specs_resolve_float_declared_keys_as_float,
 )
 from tests.test_predbat_metrics_data_age import test_data_age_metrics_round_trip
 from tests.test_metrics_dashboard_control_conflicts import test_control_conflicts_metrics_round_trip, test_control_conflicts_dashboard_renders_section
@@ -669,6 +671,8 @@ def main():
         ("get_ha_config_fractional_default", test_get_ha_config_normalises_int_default_for_fractional_step, "get_ha_config normalises int default to float for fractional-step items (#4296)", False),
         ("metric_battery_cycle_fractional", test_metric_battery_cycle_fractional_value_not_truncated, "metric_battery_cycle fractional value not truncated by get_arg (#4296)", False),
         ("metric_battery_value_scaling_step", test_metric_battery_value_scaling_step_resolves_export_margin, "metric_battery_value_scaling step resolves the export margin (#4840)", False),
+        ("float_keys_float_defaults", test_float_declared_keys_never_read_with_int_default, "No float-declared APPS_SCHEMA key is read with an int default (#4925)", False),
+        ("component_arg_float_specs", test_component_arg_specs_resolve_float_declared_keys_as_float, "COMPONENT_LIST arg specs resolve float-declared keys as float (#4925)", False),
         ("data_age_metrics", test_data_age_metrics_round_trip, "Metrics dashboard data_age_days/data_age_required_days tests", False),
         ("control_conflicts_metrics", test_control_conflicts_metrics_round_trip, "Metrics dashboard control_conflicts round-trip tests", False),
         ("control_conflicts_dashboard", test_control_conflicts_dashboard_renders_section, "Metrics dashboard control_conflicts section render tests", False),