One of the best features of Deye and Sunsynk inverters is the time-of-use functionality. This helpful tool allows you to effectively manage your battery levels and optimize your system for maximum savings and performance.
With the time-of-use functionality, you can strategically schedule when your inverter discharges your batteries for self-consumption and when the batteries are charged from the grid.

Time of Use Function: Deye inverter and Sunsynk inverter

Understanding the time of use function of Deye or Sunsynk inverters is crucial for maximizing the benefits of your solar installation.

Both Deye and Sunsynk inverters are essentially the same machine, manufactured by Deye. While the interface on the Sunsynk Inverter may differ slightly from the Deye, the systems function in the same way.

The time of use function allows you to set specific SOC (state of charge) levels for your battery capacity, with the flexibility of six customizable time periods. This feature ensures that your batteries are charged up to a desired level at a specific time, while preventing them from discharging beyond that level during that period.

It is important to note that these SOC levels are bypassed in the event of a grid failure. In such cases, the system will discharge the batteries beyond the set time of use level, in order to maintain power supply to essential loads. The system will continue to power the essential load until the cut-off level set in the battery settings section is reached.

Now, let’s explore how you can utilize the time of use function to save on power consumption from the grid.

By using battery storage, you can power or supplement both essential and non-essential loads during normal grid operation, particularly during the night or when solar production is insufficient. The specific settings for this function will vary depending on factors such as battery capacity, as well as the timing and amount of power consumption throughout the day and what times of day certain levels of power are consumed.

To better understand the practical application of the time of use function, let’s consider three different scenarios:

  1. Scenario A: High daytime power consumption

In this scenario, you can program the time of use function to charge your batteries to a higher SOC level during the day, when solar production is at its peak. This allows you to rely less on grid power during the day, resulting in significant cost savings.

  1. Scenario B: During the night time periods use available battery capacity to power your essential and non-essential loads during normal grid operation.

Examples – Deye Time of Use settings

  1. Using most of the stored battery capacity to supplement the loads. In the given scenario, assuming no scheduled power outages and a stable grid with no expected outages, and considering the recommended discharge level of the battery as 80% with 20% remaining, the settings can be adjusted to use up to 75% of the battery capacity with a 5% safety margin. This means the state of charge (SOC) is set to 25%. (Refer to Figure 1, where the batteries will discharge down to 25% SOC to provide power for night time loads).

In this system, during normal grid operation, up to 75% of the battery capacity will be used to power or supplement both essential and non-essential loads. The batteries will discharge by up to 75% if necessary.

Deye Time of Use Enable

Deye time of use enable and settings screen

  1. Maximize the use of power from the batteries for self-consumption, considering the occurrence of load shedding during a specific time period. In this case, we will assume that load shedding is expected in the early morning, from 4am to 6am.

To implement this option, the battery is programmed to discharge up to 50% overnight, ensuring that there is enough power remaining to sustain the essential load during the load shedding period from 4am to 6am. If, after the load shedding period, the battery’s state of charge has not reached the 35% mark, it will continue to discharge until it reaches that level.

no grid charge time of use settings deye

3 .Multiple times with load shedding

To optimize the use of batteries for self-consumption during scheduled load shedding periods, follow these steps:

Lets assume there are two scheduled outages: one between 10pm and midnight, and the second between 6am and 8am.
Allocate 80% of battery storage for the first outage and 50% for the second outage, as long as the essential load remains below 30% during the first outage.

Using time of use to grid charge the batteries

To continued power supply, you can enable the grid charge option by checking the box next to it. This feature allows the inverter to charge the battery from the grid to the desired level if it falls below the set value during the specific time period.Time of use with grid ChargeTime of use grid charge no generator charge

In the provided images, the first option uses the grid to charge the batteries during the night if they are not at the required level for the time period. On the other hand, the second option is designed to use the grid to charge or supplement the charge to the required level if there is insufficient solar production. This ensures that even on cloudy days, you will have enough backup capacity.

By implementing these strategies, you can enhance the efficiency, reliability, and cost saving of your full hybrid inverter systems.

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As mentioned before the example will vary on individual sites depending on factors like total battery capacity, system size, how much and when power is consumed.