SOLAR CHARGING SYSTEM PROBLEM SYMPTOMS TABLE

Solar Charging System
Symptom Suspected Area Link
Solar charging system power generation malfunction ECU power source circuit

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Solar charging system power generation malfunction

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  1. CUSTOMER PROBLEM ANALYSIS

    Symptom Detail Confirmation List
    Confirmation item Description
    Vehicle Specifications

    Vehicle Model / VIN (Vehicle Identification Number) / Vehicle Registration Date / Date and Time When Vehicle Brought to Workshop / Total Driving Distance /Exterior Color, Interior Color*


    • *Useful for estimating the cabin temperature.
    Symptoms

    Customer Concerns

    Example:

    Solar charging is not performed even though the amount of solar radiation is sufficient, solar charging performance has decreased, etc.
    Solar Charging Warning Light Illumination Can be used to judge if a solar charging system malfunction has been detected.
    Date/Time Symptom Was Noticed -
    Weather

    Conditions such as if it was sunny, cloudy or rainy, existence of thunder/lightning, ambient temperature, etc.

    Useful for estimating the amount of solar radiation when the malfunction occurred.
    Frequency of Occurrence

    The number of times the malfunction has occurred.

    (Every time. Some time, Only one time)
    Use of Sunshade Useful for estimating the cabin temperature.
    Existence of Window Film/Tint

    Front Windows (% IR Rejection) / Rear Windows (% IR Rejection) / None

    Useful for estimating the cabin temperature.
    Power Switch State

    OFF / ACC / IG / READY

    Useful for estimating the charging state of the solar battery.
    Charging AC Voltage

    100V Series / 200V Series / Not usually plug-in charged

    Useful for estimating the charging state of the HV battery.
    Total Lifetime Generated Power Wh
    Solar Roof Dirt/Damage Useful for estimating the charging state of the solar battery.
    Shadow Over Roof When Malfunction Occurred Useful for estimating the charging state of the solar battery.
    Repair History History of previous repairs can be useful for troubleshooting.
    Location Vehicle Parked When Malfunction Occurred

    Home / Not Home / Parking Location Details (Orientation of the vehicle, Address, etc.)

    Useful for estimating the amount of solar radiation when the malfunction occurred.
    Usual Parking Location

    Parking Location Details (Location, Orientation of the vehicle, Address, etc.)

    Useful for estimating the amount of electricity generated normally.
    Main Use of Vehicle Commuting / Leisure or Shopping / Business / Other (Average daily driving distance, etc.)
    Frequency of Use of Vehicle Weekdays / Weekends / Occasionally
    Optional Components In particular, check for optional components related to the electrical system, such as ones which use a constant (+B) power supply or IG power supply.
    Usual Plug-in Charging Method

    100V Series / 200V Series / Not usually plug-in charged

    Immediately after Returning Home / Before Departing / Not at Home
    Existence of Modifications Modifications which draw power from the solar charging system.
    Roof Condition

    • How often the roof is cleaned.

    • Existence of a roof over the parking location.

    • Existence of shadow over solar roof when parked. (Approximate amount shaded)

    Useful for estimating the amount of electricity generated normally.
    Confirmation Item Reply Detail Explanation
    When Malfunction Occurred Summer

    • If the temperature of the solar panel becomes high, the power generation efficiency will decrease. Therefore, in summer, the generated power may be lower than expected when considering the power of the sunlight.
    Winter, early morning, dusk

    • When the angle of incidence of sunlight to the solar panel is small, the amount of generated power will be extremely low. Therefore, in the early morning, at dusk or during winter, the generated power may be lower than expected when considering the power of the sunlight.
    Weather When Malfunction Occurred Not clear and sunny

    • As the amount of energy carried by direct sunlight is large, if it is blocked, the generated power will drop.

    • Even if it is only slightly cloudy, if the sun is blocked, the generated power may be lower than expected when considering the power of the sunlight.
    Location Vehicle Was Parked On a hill, etc. (Location where angle of incidence of sunlight to solar panel is small)

    • When the angle of incidence of sunlight to the solar panel is small, the amount of generated power will be extremely low.

    • If the vehicle is parked on a hill, etc., the generated power may be lower than expected when considering the power of the sunlight.
    Location Vehicle Was Parked Parked facing south, etc. (cabin temperature became high)

    • The temperature protection function of the solar charging system may operate when the cabin temperature becomes high.

    • By taking certain measures, such as parking facing north, using a sunshade, etc., the solar charging system can operate effectively.
    Location Vehicle Was Parked Shadow over solar roof

    • As the amount of energy carried by direct sunlight is large, if it is blocked, the generated power will drop.

    • Even if the solar roof is only partially blocked by vegetation or a structure, the generated power may be lower than expected when considering the power of the sunlight.
    Power Switch State ACC, IG

    • When the power switch is on (ACC) or on (IG), charging of the HV battery and power supply to the accessories and auxiliary battery by the solar charging system are suspended.

    • Power generation will be suspended after the solar battery is fully charged.
    Plug-in Charging State Plug-in charging When plug-in charging is being performed, the solar charging system will be suspended.
    HV Battery SOC (Displayed on Multi-information Display) Approximately 90%

    • The HV battery will not be charged by the solar charging system if the SOC of the HV battery is high, such as after performing plug-in charging.

    • In order to protect the HV battery, it will not be charged by the solar charging system if the HV battery has not been used a certain amount after being fully charged.

    • If the vehicle can be left in an appropriate location for a certain amount of time, the HV battery can be charged successfully through solar charging instead of plug-in charging.
    Existence of Optional Components Shadow over solar roof (due to roof rack, etc.)

    • As the amount of energy carried by direct sunlight is large, if it is blocked, the generated power will drop.

    • Even if the solar roof is only partially blocked by a thin object, such as a roof rack, the generated power may be lower than expected when considering the power of the sunlight.
    Other Power supply (Auxiliary battery)

    • The solar charging system will be suspended if the auxiliary battery voltage is low.

    • If the auxiliary battery is discharged or a cable has been disconnected from the auxiliary battery for when the vehicle is to be stored, the solar charging system will be suspended and the energy generated display will not increase.
    HV battery heater operated

    • When the HV battery heater is operating, charging of the HV battery and power supply to the accessories and auxiliary battery by the solar charging system are suspended.

    • Power generation will be suspended after the solar battery is fully charged.
    Remote air conditioning system operated

    • When the remote air conditioning system is operating, charging of the HV battery and power supply to the accessories and auxiliary battery by the solar charging system are suspended.

    • Power generation will be suspended after the solar battery is fully charged.