diff --git a/README.md b/README.md
index b366aa6..6c1a6e1 100644
--- a/README.md
+++ b/README.md
@@ -347,6 +347,8 @@ Supported control operations:
 |---------|--------|--------|
 | Backup reserve | `set_reserve(level)` | 0-100 (percentage) |
 | Operation mode | `set_mode(mode)` | `self_consumption`, `backup` |
+
+> **Cloud/FleetAPI Reserve Limit:** Tesla's cloud APIs enforce a maximum backup reserve of 80%. If you need to set the reserve above 80% (e.g., for a full charge before an outage), use the v1r LAN mode shown below. The `set` CLI will print a warning when you attempt to exceed 80% in cloud or FleetAPI mode.
 | Grid charging | `set_grid_charging(enable)` | `True` / `False` |
 | Grid export | `set_grid_export(mode)` | `battery_ok`, `pv_only`, `never` |
 
@@ -597,7 +599,7 @@ print("System Status: %r\n" % pw.system_status())
     is_connected()            # Returns True if able to connect and login to Powerwall
     get_reserve(scale)        # Get Battery Reserve Percentage
     get_mode()                # Get Current Battery Operation Mode
-    set_reserve(level)        # Set Battery Reserve Percentage
+    set_reserve(level)        # Set Battery Reserve Percentage (cloud/FleetAPI max 80% - use v1r for higher)
     set_mode(mode)            # Set Current Battery Operation Mode
     get_time_remaining()      # Get the backup time remaining on the battery
     set_operation(level, mode, json)        # Set Battery Reserve Percentage and/or Operation Mode
@@ -743,6 +745,11 @@ python -m pypowerwall set -reserve 20
 # Set reserve to current charge level
 python -m pypowerwall set -current
 
+# ⚠️ Cloud and FleetAPI modes limit backup reserve to 80% max.
+# To set reserve above 80%, use v1r LAN mode:
+python -m pypowerwall set -v1r -host 10.42.1.40 -gw_pwd ABCDEXXXXX \
+    -rsa_key_path ./tedapi_rsa_private.pem -reserve 100
+
 # Grid charging and export
 python -m pypowerwall set -gridcharging on
 python -m pypowerwall set -gridcharging off
diff --git a/RELEASE.md b/RELEASE.md
index 4c7b964..c59cfa4 100644
--- a/RELEASE.md
+++ b/RELEASE.md
@@ -2,6 +2,10 @@
 
 ## v0.15.7 - Grid Noise Suppression and v1r Owner API Login Fix
 
+* Docs: Document Tesla cloud/FleetAPI 80% backup reserve limit
+     * Added warning in README and CLI examples for `set -reserve` when using cloud or FleetAPI mode
+     * CLI now prints a WARNING when attempting to set reserve above 80% in cloud/FleetAPI mode, and a NOTE if Tesla caps the actual value
+     * Added v1r LAN mode example showing how to set reserve above 80%
 * Feat: Add `PW_SITE_ZERO_THRESHOLD` environment variable to suppress phantom grid noise readings
   * When set to a positive integer value (in watts), site power readings with absolute value at or below the threshold are reported as 0
   * Applies to `/api/meters/aggregates` site power, `/csv`/`/csv/v2` grid power, and `/json` grid power endpoints
diff --git a/pypowerwall/__main__.py b/pypowerwall/__main__.py
index a42647f..d9fc09a 100644
--- a/pypowerwall/__main__.py
+++ b/pypowerwall/__main__.py
@@ -448,12 +448,28 @@ def main():
             pw.set_mode(mode)
         if args.reserve != -1:
             reserve = args.reserve
+            if reserve > 80 and pw.mode in ('cloud', 'fleetapi'):
+                print(f"WARNING: Tesla cloud/FleetAPI limits backup reserve to 80% max. "
+                      f"Requesting {reserve}% but Tesla may cap it at 80%. "
+                      f"Use TEDAPI v1r mode (-v1r) to set reserve above 80%.")
             print("Setting Powerwall Reserve to %s" % reserve)
             pw.set_reserve(reserve)
+            if reserve > 80 and pw.mode in ('cloud', 'fleetapi'):
+                actual = pw.get_reserve(scale=True, force=True)
+                if actual is not None and actual <= 80:
+                    print(f"NOTE: Tesla capped reserve at {actual}% instead of {reserve}%.")
         if args.current:
             current = float(pw.level())
+            if current > 80 and pw.mode in ('cloud', 'fleetapi'):
+                print(f"WARNING: Tesla cloud/FleetAPI limits backup reserve to 80% max. "
+                      f"Current charge is {current:.0f}% but Tesla may cap reserve at 80%. "
+                      f"Use TEDAPI v1r mode (-v1r) to set reserve above 80%.")
             print("Setting Powerwall Reserve to Current Charge Level %s" % current)
             pw.set_reserve(current)
+            if current > 80 and pw.mode in ('cloud', 'fleetapi'):
+                actual = pw.get_reserve(scale=True, force=True)
+                if actual is not None and actual <= 80:
+                    print(f"NOTE: Tesla capped reserve at {actual}% instead of {current:.0f}%.")
         if args.gridcharging:
             gridcharging = args.gridcharging.lower()
             if gridcharging not in ['on', 'off']: