11 of 20 - Time Charging Mode

Time Charging Mode, also known as Time-of-Use mode, is the optimal choice for those who wish to use their stored power to curtail peak energy rates (a practice known as peak shaving). This mode allows the battery to be programmed to accept a charge and to discharge power at specific times. Since peak rates are typically in the evening hours between 4 and 10PM, it is recommended to set the discharge time to fall within that time frame. 

This how to set up the system for Time Charging/Time of Use Mode:

  1. Press the Enter button and then use the Down button to scroll  to "Advanced Settings" and then press Enter
  2. The password is 0010 - press Down, Down, Up, and then Enter
  3. Scroll down to "Storage Energy Set" and press Enter - press the Down button once more to "Storage Mode Select" and then press Enter again
  4. Use the Down button to highlight "Time Charging" and then press Enter
    1. Note: press the Enter button to scroll through the different options and the Up/Down buttons to make changes
    2. "Optimal Income" should say "Run" next to it 
    3. The default Charge and Discharge Limits should be adequate, there is no need to alter them
      1. The maximum values will differ based on the battery type
      2. Maximum limits for BYD:
        1. Charge Limit: 14.3A
        2. Discharge Limit: 12.0A
      3. Maximum limits for LG Chem:
        1. Charge Limit: 15A
        2. Discharge Limit: 13.8A
    4. Set the Charge Time (in Hour-Minute to Hour-Minute format) in military time
      1. During this window, the battery will accept a charge
      2. Most likely, this will be set up for hours in which there is sun
        1. Example: 07:00 --- 14:00
    5. Set the Discharge Time
      1. During this window, the battery will discharge energy if the PV cannot cover the consumption demand
      2. For peak shaving, set this window to match peak-rate hours
        1. Example: 5-9PM would be Discharge Time of 17:00 -- 21:00
      3. Total Time will be displayed on the right in Hours-Minutes
  5. Press ESC and then when "Save and Send" is selected, press Enter
  6. It is important to check "Backflow Power" found within the Advanced Settings menu under the "Export Power Set" submenu - This is how much power is allowed to be exported back to the grid
    1. Set this value to the name-plate rating of the inverter, unless you do not wish to export power
      1. Ex: RHI-1P10K would be 10000W (10 kW)
      2. If you do not wish to export power, or are not allowed to export power then set this value to +00000W
  7. The system is now set up for Time Charging Mode and will discharge energy during the programmed hours
  8. On the inverter screen there is an arrow between the inverter and battery - this indicates power flow between the two
    1. Arrow pointing towards the battery means the battery is accepting a charge
    2. Arrow pointing away from the battery means the battery is discharging energy
    3. Energy (kW) will be shown above the arrow

How long the battery lasts depends purely on how much power is being discharged at any given time. This rate can be set by changing the Discharge Limit (A) in the "Time Charging" menu. The nominal voltage for the LG Chem RESU10H battery is about 370 volts; whereas, the nominal voltage for the BYD battery is about 420 volts. For a discharge of 5 kW, the Discharge Limit for LG Chem would be 13.5A (5000/370) and the Discharge Limit for the BYD would be 12A (5000/420). 

The batteries will each last a little less than two hours while charging at this rate and will be able to provide around 8 kWh of power total.

The total amount of kWh that can be obtained from a single full charge will increase as the discharge rate decreases. 

Therefore, if the battery is being discharged at a rate of 1 kW then it will last for nearly ten hours and close to 10 kWh will be generated from one full charge

Michael is the author of this solution article.

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