Trusted HVAC, Plumbing & Electrical Experts

Each replay uses a recreated ChatGPT interface so the placement can be read in its original conversational context. It is not a live or embedded chat.

1. ObservedJul 13, 2026Conversation1 turnsPlacementAfter turn 01 turns · After turn 0Replay chat
   Observed conversationJul 13, 2026 · interface recreation

   ChatGPTArchived view

   Why would a Tesla not allow charging to 100% using a home charger @ 48 Amps?

   If a Tesla won't charge to 100% on a 48A home charger, there are several possible causes. The charging current (48A) itself is usually not the reason. Here are the most common explanations:

   1. Charge limit is set below 100%

      • This is by far the most common cause.
      • Check the charge limit in the car's touchscreen or Tesla app. Many owners leave it at 80% or 90% for daily use.

   2. Battery conditioning or balancing

      • As the battery approaches full, charging slows dramatically while the battery management system balances the individual cells.
      • It may appear to "stop" at 99%, or take a long time to reach 100%.

   3. Scheduled charging or departure settings

      • If you have Scheduled Charging or Scheduled Departure enabled, the car may pause charging and finish later to coincide with your planned departure time.

   4. Cold battery

      • In cold weather, the battery may need to warm up before accepting a full charge.
      • The car may temporarily stop below 100% until conditions improve.

   5. Battery calibration

      • Sometimes the displayed state of charge isn't perfectly calibrated.
      • The car may report 100% slightly before or after the battery is actually full.

   6. Power interruption

      • If the circuit breaker trips, the wall connector loses power, or the utility voltage drops, charging may stop before reaching the target.

   7. Charging equipment issue

      • A fault in the Wall Connector, mobile connector, or charging cable can interrupt charging.
      • The Tesla app or vehicle display will usually show an error if this occurs.

   8. Battery or charging system fault

      • Less commonly, the Battery Management System may detect an issue and stop charging for safety.
      • This is usually accompanied by a warning message in the app or on the touchscreen.

   Does 48A matter?

   Not typically. A Tesla capable of charging at 48A AC will simply taper the current as the battery fills. Near 100%, it may drop from 48A to 30A, then 16A, 8A, or even lower. This is normal and helps protect the battery.

   A few questions that would help narrow it down:

   • Which Tesla model and model year is it?
   • What percentage does it stop at (e.g. 80%, 90%, 97%, 99%)?
   • Does the Tesla app say "Charging Complete", "Charging Stopped", or show an error?
   • Is this using a Tesla Wall Connector, Mobile Connector, or a third-party EVSE?
   • Is this behavior new, or has it always happened?

   

   Aireo Home Services LLCAd

   Trusted HVAC, Plumbing & Electrical ExpertsTrusted HVAC, plumbing & electrical service for Northern Utah homeowners.