Control Strategies
Basic Settings
When the start-up mode is set to “Passive Mode”, the equipment is controlled by the local EMS. Once the parameters have been configured, the system runs automatically according to the relevant control strategies, with no manual intervention required.
When the start-up mode is set to “Third-party Dispatch Mode”, the equipment is connected to and accepts dispatch from a third-party platform, and the system is then controlled entirely by that third party. In this case, only the parameters for tariff settings, reserved backup power, demand control, export limitation, transformer protection, off-grid operation and grid-connected/off-grid start-up are retained, so as to avoid conflicts with the third-party dispatch. Local mode: in local mode, you can set the power parameters from the cloud platform page or from the equipment’s local web page. This mode is mainly used during installation and commissioning, as it allows quick on-site configuration and verification. In remote mode, the connection is established through the physical communication interface of the EMS, and control commands are sent over that connection, enabling remote control and dispatch of the equipment.
Field descriptions:
| Field | Range | Description |
|---|---|---|
| Start-up mode | Drop-down: Passive Mode, Third-party Dispatch Mode | -- |
| Local/Remote | Drop-down: Local, Remote | -- |
| Dispatch interruption control method | Drop-down: Hold current value, Zero power output | -- |
| Dispatch protocol | Drop-down: MODBUS-TCP, IEC104, SunSpec | -- |
| Active power set point (MW) | Range: -99999.9999~99999.9999 | -- |
| Active power dead band (kW) | Range: 0~99999.9 | -- |
| Reactive power set point (Mvar) | Range: -99999.9999~99999.9999 | -- |
| Reactive power dead band (kvar) | Range: 0~99999.9 | -- |
| AC connection type | Drop-down: AC_GRID, AC_GENERATOR | -- |
| DC/AC coupling mode | Drop-down: AC, DC, Hybrid | -- |
| Off-grid supply recovery SOC (%) | Range: 5-100 | -- |
| Off-grid supply cutoff SOC (%) | Range: 5-100 | -- |
| AC-side PV installed capacity (kW) | Range: 0-99999.9 | -- |
| DC-side PV installed capacity (kW) | Range: 0-99999.9 | -- |
| PV INV installation position | Drop-down: Not installed, Grid side, STS load side | -- |
Tariff Settings
Tariffs can be configured separately for different months and time periods.
Field descriptions:
| Field | Range | Data precision | Description |
|---|---|---|---|
| Demand charge (CNY/kW·month) | Range: 0~99999.999 | Three decimal places | For equipment located in China, the page displays the “Demand charge” setting field |
| Time type | Drop-down: Critical peak, Peak, Flat, Off-peak, Deep off-peak | -- | -- |
| Tariff | -- | Three decimal places | -- |
Three-Phase Imbalance Control
Feature Overview
Three-phase imbalance control is used where the load is unevenly distributed across the three phases. Based on the single-phase current or power limits you set, it regulates the storage PCS phase by phase so that, as far as possible, the currents or power at the grid connection point (the point of supply) remain balanced and stay within the limits, keeping the system running stably. This function can only charge on all phases or discharge on all phases at the same time.
Once three-phase imbalance control is enabled, the system regulates the PCS phase by phase according to real-time operating conditions, without affecting normal electricity use or production.
What it does:
- Monitors the three-phase currents and power in real time;
- Applies control based on the single-phase current or power limits you set, easing single-phase overload;
This feature helps customers solve the following problems:
- Reduces the risk of single-phase overload and faults;
- Improves three-phase imbalance, keeping electricity use safe;
- The system adjusts automatically, with no manual intervention required;
INFO
The content shown on the three-phase imbalance page varies depending on the equipment model. The field descriptions below cover all fields across the different versions of the page.
Field descriptions:
| Field | Range | Data precision | Description |
|---|---|---|---|
| Parameter setting | Drop-down: Single-phase current, Single-phase power, Total connection-point power | -- | Supports parameter settings in three different dimensions: single-phase current, single-phase power and total connection-point power. |
| Phase A current (A) | Range: 0-65535 | Integer | Limits the maximum current on phase A at the grid connection point. Set this according to the rated current of the on-site circuit breaker or switch; the value entered must not exceed the maximum single-phase current the breaker allows, so as to avoid over-current and protection tripping. |
| Phase B current (A) | Range: 0-65535 | Integer | Limits the maximum current on phase B at the grid connection point. Set this according to the rated current of the on-site circuit breaker or switch; the value entered must not exceed the maximum single-phase current the breaker allows, so as to avoid over-current and protection tripping. |
| Phase C current (A) | Range: 0-65535 | Integer | Limits the maximum current on phase C at the grid connection point. Set this according to the rated current of the on-site circuit breaker or switch; the value entered must not exceed the maximum single-phase current the breaker allows, so as to avoid over-current and protection tripping. |
| Phase A active power (kW) | Range: 0-99999.9 | One decimal place | Limits the maximum active power permitted on phase A at the grid connection point. Set this according to the capacity of the on-site circuit breaker or switch; the power value entered should not exceed the maximum single-phase power the breaker can carry, to avoid protection tripping caused by exceeding the limit. |
| Phase B active power (kW) | Range: 0-99999.9 | One decimal place | Limits the maximum active power permitted on phase B at the grid connection point. Set this according to the capacity of the on-site circuit breaker or switch; the power value entered should not exceed the maximum single-phase power the breaker can carry, to avoid protection tripping caused by exceeding the limit. |
| Phase C active power (kW) | Range: 0-99999.9 | One decimal place | Limits the maximum active power permitted on phase C at the grid connection point. Set this according to the capacity of the on-site circuit breaker or switch; the power value entered should not exceed the maximum single-phase power the breaker can carry, to avoid protection tripping caused by exceeding the limit. |
| Total connection-point power (kW) | Range: 0-99999.9 | One decimal place | Limits the total active power permitted at the grid connection point. Make sure the value entered does not exceed the overall power limit of the connection-point circuit breaker, so that the system operates safely. |
| Single-phase current (A) | Range: 0-65535 | Integer | -- |
Transformer Protection
Feature Overview
Transformer protection is intended for sites with large load fluctuations, or where several sources such as energy storage and PV are connected at the same time. It automatically adjusts the charging and discharging power of the storage system to prevent the power at the grid connection point (the point of supply) from exceeding the transformer capacity, reducing the risk of transformer overload. Once transformer protection is enabled, the system adjusts the storage charging and discharging power automatically according to real-time operating conditions, without affecting normal electricity use or production. This function can also be used where there is no transformer at the grid connection point but an upper limit on the power passing through that point is nonetheless required.
What it does:
- When the load suddenly increases, it automatically reduces the storage charging power or switches to discharging, easing the load on the transformer;
- When the storage system is discharging at high power alongside other sources, it automatically limits the storage discharge power;
- It ensures the power at the grid connection point (the point of supply) always stays below the safe transformer capacity;
This feature helps customers solve the following problems:
- Reduces the risk of transformer overload and tripping;
- Keeps the site running stably;
- The system adjusts automatically, with no manual intervention required;
Field descriptions:
| Field | Range | Data precision | Description |
|---|---|---|---|
| Protection capacity (kW) | Range: 0~99999.9 | One decimal place | Sets the rated capacity of the transformer |
| Protection factor (%) | Range: 0~100 | Integer | Used for the actual storage system control: maximum transformer throughput capacity = rated transformer capacity * protection factor |
Demand Control
Feature Overview
The grid charges according to your “maximum power demand”. If your power consumption suddenly exceeds that maximum at any moment, your electricity bill for the month can increase sharply.
Demand control helps you manage consumption peaks automatically so that the maximum power demand is not exceeded. The system monitors the power measured by the meter where the plant connects to the grid (the connection point/point of supply) in real time — rather like a round-the-clock “consumption monitor”.
When the system detects that the current power is approaching or exceeding the “maximum permitted demand” you have set in advance, it automatically takes action:
- It gives priority to discharging the battery, so that less power is drawn from the grid;
- Where conditions allow, it increases PV output so that more self-generated energy is used;
In this way, the power at the grid connection point (the point of supply) is kept within the range you have set, avoiding additional demand charges caused by momentary peaks in consumption.
What it does:
- No need for frequent manual parameter adjustments;
- The system adapts the control limit automatically to actual consumption;
- It continuously optimises energy costs whilst keeping production running normally;
This feature helps customers solve the following problems:
- Prevents sudden spikes in power consumption and the high charges that result from exceeding the demand limit;
- Makes fuller use of energy storage and PV, reducing imported electricity;
- Peak shaving can also be achieved with this function;
- Fully automatic control, with no manual supervision required;
Field descriptions:
| Field | Range | Data precision | Description |
|---|---|---|---|
| Mode | Drop-down: Demand tracking, Contracted demand | -- | If you select “Contracted demand”, “Maximum permitted demand (kW)” is displayed; |
| Maximum permitted demand (kW) | Range: 0~99999.9 | One decimal place | Sets the upper limit for power drawn from the grid. When the meter at the point where the plant connects to the grid (the connection point/point of supply) detects that real-time consumption exceeds this value, the system discharges automatically to avoid exceeding the demand limit. |
| Actual demand (kW) | -- | -- | In practice, some businesses are billed on a real-time demand basis. |
Export Limitation
Feature Overview
If the combined output of PV generation and battery discharge exceeds the on-site load, the surplus flows back into the grid — known as “feed-in”. If the feed-in power exceeds local requirements, this can lead to breaches of grid connection rules, fines or uncertain returns. The export limitation function helps you avoid this automatically.
The system monitors the power at the point where the plant connects to the grid (the grid connection point/point of supply) in real time and determines whether there is a tendency to export to the grid. When the system finds that PV generation + battery discharge > the actual on-site load — in other words, that export to the grid is about to occur or is already occurring — it adjusts automatically according to the feed-in parameters you have set: it reduces the storage discharge power or switches the storage system to charging, and, if necessary, limits PV output.
What it does:
- Automatically prevents surplus energy from being fed back into the grid, meeting local grid connection requirements and avoiding penalties or compliance risks caused by exceeding feed-in limits;
- Through these adjustments, the plant generates just enough to meet on-site consumption without sending surplus energy to the grid;
This feature helps customers solve the following problems:
- Prevents reverse power flow to the grid, avoiding penalties or operational risks caused by feed-in;
- Setting a positive maximum feed-in power makes valley filling possible;
- Fully automatic control, with no manual supervision required;
Field descriptions:
| Field | Range | Data precision | Description |
|---|---|---|---|
| Maximum feed-in power setting | Drop-down: Maximum feed-in power, Maximum feed-in power coefficient | -- | If you select “Maximum feed-in power (kW)”, “Maximum feed-in power (kW)” is displayed; |
| Maximum feed-in power (kW) | Range: -99999.9~99999.9 | One decimal place | Entering a positive value (typical of “zero feed-in” scenarios): where the site does not permit any export to the grid, it is advisable to set the maximum feed-in power to a positive value. The EMS will then deliberately keep the power imported from the grid equal to the value set, preventing brief feed-in if the load suddenly drops. Entering a negative value (for scenarios where feed-in is permitted): where the site permits export to the grid, set the maximum feed-in power to a negative value. The EMS will then keep the power fed into the grid below the value set. |
| Maximum feed-in power coefficient (%) | Range: 0~100 | Integer | Maximum feed-in power = installed PV capacity * this coefficient. When the actual feed-in power is found to exceed the maximum feed-in power, the system automatically starts export limitation control to prevent the feed-in limit from being exceeded. |
Reserved Backup Power
Feature Overview
Where power cuts are possible, you can set aside part of the battery’s energy in advance as emergency backup power for the equipment connected to the backup port. During day-to-day operation and discharging, the system ensures the remaining battery energy does not fall below the “UPS Reserve SOC” you have set, so the emergency reserve is never used up. If the system detects that the current battery level is below the reserved backup level, it automatically starts recharging to top the battery up and keep the reserve sufficient. Recharging takes place at the backup power setting configured on the page, which keeps the system safe without affecting other electricity needs.
What it does:
- Sets aside emergency energy in the battery in advance, so that critical loads connected to the backup port keep running during a power cut;
- During normal operation the system automatically limits discharging so the battery level does not fall below the reserved backup value, and recharges automatically when the level is too low;
This feature helps customers solve the following problems:
- Ensures power is still available during an outage, keeping equipment connected to the backup port running;
- Fully automatic control, with no manual supervision required;
Field descriptions:
| Field | Range | Data precision | Description |
|---|---|---|---|
| UPS Reserve SOC (%) | Range: 0-100 | Integer | When the system detects that the current battery SOC is below this value, it intelligently starts recharging according to the state of the energy storage system, and stops charging once the battery reaches this SOC. |
| Backup power | Range: 0~99999.9 | One decimal place | The equipment charges at this power. |
Power Factor Control
Feature Overview
This function automatically regulates the reactive power output of the storage plant, helping the site maintain a reasonable power factor and reducing power-factor adjustment charges. It suits sites with large load fluctuations that risk power-factor penalties. Once power factor control is enabled, the system adjusts automatically according to site conditions, without affecting normal electricity use or production.
What it does:
- Monitors the site power factor in real time;
- Automatically provides reactive power compensation;
- Keeps the power factor stable and within the acceptable range;
- Reduces or avoids power-factor adjustment penalties;
This feature helps customers solve the following problems:
- The power factor stays compliant and the billing structure becomes more stable;
- The system runs automatically, with no manual intervention required;
Field descriptions:
| Field | Range | Data precision | Description |
|---|---|---|---|
| Target power factor at the grid connection point (cos) | Range: -1.00~1.00 | Two decimal places | Sets the power factor you want to achieve at the grid connection point. The system automatically regulates the reactive power of the storage system to bring the power factor at the connection point as close as possible to this target. The closer the value is to 1, the less reactive power there is, the more efficient the energy use, and the better the compliance with grid requirements. |
Auxiliary Control
SOC Calibration
Feature Overview
SOC calibration uses a controlled charging process to let the system re-establish the true energy level of the battery, making the SOC reading more accurate. Once calibration is complete, the system’s assessment of the battery level is closer to reality, providing a reliable basis for subsequent charge/discharge control and strategy execution.
What it does:
- Corrects SOC deviations, avoiding situations where the battery “looks charged but is empty” or “shows empty but still has energy”;
- Executes charge/discharge, backup power, export limitation and other strategies on the basis of the true energy level, reducing false protection triggers and strategy faults;
- Helps customers judge accurately how much energy is still available, improving the overall stability and predictability of the energy storage system;
This feature helps customers solve the following problems:
- More accurate SOC readings and more reliable control strategies;
- More realistic assessment of available energy, with fewer false protection triggers and strategy faults;
Field descriptions:
| Field | Range | Data precision | Description |
|---|---|---|---|
| SOC calibration power (kW) | Range: 0-6553.5 | One decimal place | The system performs the calibration charge at this power |
| Manual SOC calibration | Drop-down: Off, On | -- | If you switch on “Manual calibration”, the system calibrates the battery level immediately |
| Automatic SOC calibration | -- | -- | If you switch on “Automatic calibration”, the system performs a calibration charge automatically whenever the conditions are met |
Under-voltage Forced Charging
Feature Overview
Under-voltage forced charging is a battery self-protection mechanism for cases where the battery has accidentally been discharged too far or has been running at a low SOC for a long time. When the battery voltage is too low, the system automatically starts forced charging to bring the battery back into the safe voltage range.
What it does:
- Automatically forces charging when the battery level is too low, preventing under-voltage damage and keeping the system safe;
- Brings the battery voltage back into the safe range promptly, reducing the ageing and performance loss caused by prolonged operation at a low charge level;
This feature helps customers solve the following problems:
- Prevents under-voltage damage to the battery and improves operating safety;
- Reduces the risk of shortened battery life;
Field descriptions:
| Field | Range | Data precision | Description |
|---|---|---|---|
| Under-voltage forced charging power (kW) | -- | Three decimal places | The system performs forced charging automatically at the power set |
Dynamic Tariff Scheduling (Beta)
INFO
Dynamic tariff scheduling based on the EPEX Day-ahead Spot Price is currently available only in certain regions, including the Netherlands, Germany, Poland and Belgium, and is still in staged testing. If you would like to enable the function, please contact your installer or your local AlphaESS service team.
Feature Overview
Dynamic tariff scheduling automatically retrieves electricity market prices and controls when the storage equipment charges and discharges, so that operation matches high and low tariff periods and helps you use both electricity and energy storage more efficiently.
You do not need to check tariffs or adjust the strategy manually each day — the system handles the scheduling automatically as prices change.
What it does:
- Dynamic tariff scheduling adjusts the execution periods automatically according to the actual tariffs each day;
- By setting a coefficient and an additional charge, you can make the tariffs the system calculates closer to your real bill;
- It improves the utilisation of energy storage and optimises energy costs;
This feature helps customers solve the following problems:
- By setting high and low tariff thresholds in advance, the system charges and discharges automatically to plan, avoiding manual judgement and operating errors;
- It reduces repetitive work;
Detailed Description
Tariff Data and Calculation Rules
Fields you must complete:
- EPEX spot coefficient (default 1, four decimal places)
- Tariff surcharge (default 0, three decimal places)
The tariff shown on the chart = EPEX price × EPEX spot coefficient + tariff surcharge (the page displays the calculated “total tariff”).
Where:
EPEX price: the market price from the power exchange
Coefficient: used to match the actual settlement ratio
Surcharge: can be used to add fixed costs (such as service fees or additional charges)
You can set the “coefficient” and the “surcharge” yourself to reflect how your bill is made up, so that the tariff calculated by the system is closer to the actual settlement price. When you view a past date: the historical tariffs for that day are calculated and saved using the last coefficient and surcharge set on that day.
Threshold Settings (how high and low tariffs are defined)
The system automatically classifies each day’s tariffs using percentile thresholds, in order to determine the charge/discharge strategy for each period.
The classification rules are as follows:
If the tariff in a given period is below the “low tariff threshold percentile”, that period is classified as a low tariff period;
If the tariff in a given period is above the “high tariff threshold percentile”, that period is classified as a high tariff period;
All remaining periods, between the two, are classified as standard tariff periods.
Here, the “percentile” indicates the relative position of that period’s tariff within the day’s price series, rather than a fixed price value. By adjusting the low and high tariff percentile thresholds, the system can divide the day into high and low tariff bands dynamically, according to the overall price distribution for that day.
The low tariff threshold defaults to 30% and the high tariff threshold to 70%; both adjust in steps of 1%.
You can adjust the percentiles using the plus and minus buttons or by dragging the slider. Whilst dragging, a small bubble above the slider shows the current percentile and the corresponding total tariff. Threshold lines: once set, a green line (low tariff line) and a red line (high tariff line) appear on the chart to mark the corresponding bands.
Tariff Chart
Hover tooltips:
- If the equipment is charging or discharging at that point in time: the time, the charge/discharge type, the power (in 5-minute granularity) and the tariff are shown.
- If there is no charging or discharging at that point in time: only the time and the tariff are shown.
Charging appears in green on the chart, discharging in yellow.
You can select a past date to view historical tariffs. Tariff data for the following day is available at around 12:00 noon Dutch time.
Strategy Settings
Estimated daily profit = energy discharged × discharge tariff − energy charged × charge tariff. This figure is only a reference to help you set the high and low tariff threshold bands.
Strategy operating logic (how the equipment charges and discharges under high, standard and low tariffs) The system divides the day into three tariff bands: high tariff / standard tariff / low tariff. A charge/discharge strategy can be set for each band separately (for example, discharge allowed/not allowed, charging allowed/not allowed, power limits, and so on).
Handling of PV (solar) during charging:
- You can choose to “disconnect PV” or “not disconnect PV”:
- “Yes” (disconnect PV): solar is not used during the charging phase, and the storage system draws energy only from the grid (or another source).
- “No” (do not disconnect PV): solar continues to supply power during the charging phase, feeding the load first, with any surplus going to the storage system; if solar is insufficient, the storage system tops up from the grid.
- Note: this setting only affects whether solar is used during the charging phase; it does not change the normal operation of solar outside charging periods.
During discharging:
- Stored energy supplies the load first; any surplus is fed into the grid (if the system settings permit feed-in).
Within the “effective execution period of the dynamic tariff”:
- Once discharging is complete, the equipment enters a “discharge inhibited” state (no further discharging within that rule cycle), whilst PV feeds into the grid at the maximum possible power (selling as much solar back to the grid as possible).
- Once charging is complete, the equipment enters a “charge inhibited” state, and PV continues to feed into the grid at maximum power.
Outside the dynamic tariff period: the equipment continues to follow whichever charge/discharge logic was already in effect and whose conditions are met (for example, the time-of-use strategy).
WARNING
Before using this function (dispatch based on EPEX dynamic tariffs), please read the following statement carefully:
Prerequisites and user responsibilities
Before using dynamic tariff scheduling, you must confirm for yourself that the following prerequisites are met:
- You have a valid dynamic tariff contract (such as spot price or day-ahead) with your electricity retailer or grid operator;
- You have obtained the discharge permit and grid connection permit required by local regulations or by your grid operator;
- You have confirmed that your region permits energy storage systems to take part in price response or feed-in operations.
These conditions vary by country, region and grid operator. AlphaESS is under no obligation to verify whether you meet them.
Nature of the function and assumption of risk
This function is currently a test (Beta) feature; the system merely calculates and executes charge/discharge strategies automatically on the basis of tariff data and preset algorithms. AlphaESS cannot accept liability for:
- Dispatch deviations caused by delays, interruptions or errors in the tariff data source;
- Increased electricity costs, lost revenue or other financial losses arising from strategy execution;
- Adverse consequences arising from external factors such as changes in grid policy or tariff structure adjustments.
By choosing to enable this function, you confirm that you understand and accept all the resulting risks yourself.
Operating deviations and status monitoring
Actual charging and discharging behaviour may deviate from the intended plan because of the accuracy of tariff forecasts, network communication latency, battery status (SOC/SOH), load fluctuations and other factors. We recommend that you:
- Check the equipment status and dispatch execution records regularly;
- Pay attention to alarm messages and deal with them promptly;
- Keep the system under manual supervision during the early stages of testing.
AlphaESS cannot guarantee that dispatch plans will be executed exactly as intended.
AlphaESS reserves the right to modify, suspend or discontinue this experimental function at any time, and will notify users through the app or official channels if it does so.
Time-of-Use Strategy
Feature Overview
A time-of-use strategy is a charge/discharge plan set up in advance. It suits sites with clearly differentiated time-of-use tariffs, predictable consumption patterns, or a need to plan storage charging and discharging ahead of time, and it specifies how the energy storage system operates during each period. With a time-of-use strategy in place, the system charges or discharges automatically at the times you have set, with no need for real-time manual intervention.
Once the time-of-use strategy takes effect, the system runs the corresponding mode automatically at the times set. The operating mode inside and outside the defined periods can be set separately, and other site protection and control strategies are unaffected.
What it does:
- Plans in advance how the storage system charges and discharges during each period;
- Switches operating mode automatically according to the time;
- Improves the utilisation of energy storage and optimises energy costs;
This feature helps customers solve the following problems:
- By setting the time periods in advance, the system charges and discharges automatically to plan, avoiding manual judgement and operating errors;
- Charging automatically during low tariff periods and discharging during high tariff periods helps lower energy costs and increase returns from the storage system;
- The time-of-use strategy takes effect automatically and runs long-term, so there is no need for daily manual adjustment — less maintenance work and more stable operation;
Note: the content shown on the time-of-use strategy page varies depending on the equipment model and software version. The field descriptions below cover all fields across the different versions.
Field descriptions:
| Field | Range | Data precision | Description |
|---|---|---|---|
| Allow discharge when demand protection is triggered | Drop-down: Allow, Prohibit | -- | Determines whether the battery may discharge to help carry the load when the power at the grid connection point triggers demand protection. When enabled, the battery can discharge to help reduce consumption; when disabled, the battery will not discharge even if demand protection is triggered. |
| Allow charging when export limitation protection is triggered | Drop-down: Allow, Prohibit | -- | Determines whether the battery may charge when export limitation protection is triggered in Self-Consumption mode (PV output exceeds the load). When enabled, the battery can absorb the surplus energy by charging, avoiding export to the grid; when disabled, the battery will no longer charge when export limitation protection is triggered. |
| Self-consumption reserved SOC (%) | Range: 5-100 | Integer | Sets the minimum SOC reserved in Self-Consumption mode. When the storage SOC falls below this value, the system gives priority to retaining energy and stops discharging. |
| Peak shaving limit (kW) | Range: 0~99999.9 | One decimal place | When the power drawn from the grid exceeds the peak shaving limit, the storage system discharges to reduce grid import. Effective only in peak shaving and valley filling mode. |
| Valley filling threshold (kW) | Range: 0~99999.9 | One decimal place | When the power drawn from the grid falls below the valley filling threshold, the storage system charges to increase grid import. Effective only in peak shaving and valley filling mode. |
| Control hysteresis (kW) | Range: 0~99999.9 | One decimal place | Acts as a buffer around the peak shaving limit and the valley filling threshold; default: 0. Effective only in peak shaving and valley filling mode. |
| Peak shaving discharge cutoff SOC | Range: 5-100 | Integer | Sets the lowest SOC to which discharging for peak shaving is permitted. Effective only in peak shaving and valley filling mode. |
| Power curtailment support cutoff SOC | Range: 5-100 | Integer | Sets the minimum SOC at which the storage system provides power support under curtailment or power-controlled conditions. Effective only in power curtailment support mode. |
| Meter power control deviation | Range: -99999.9~99999.9 | One decimal place | Used to set meter power control. Effective only in power curtailment support mode. |
| Grid charging power limit (kW) | Range: 0-99999.9 | One decimal place | Limits the power at which the grid may charge the battery. Effective only in fixed-power charging mode. |
| Charging power (kW) | Range: 0~99999.9 | One decimal place | The power at which the equipment charges the battery; |
| Charge cutoff SOC (%) | Range: 5-100 | Integer | Charging stops automatically when the battery reaches this SOC; |
| Discharging power (kW) | Range: 0~99999.9 | One decimal place | The power at which the equipment discharges the battery; |
| Discharge cutoff SOC (%) | Range: 5-100 | Integer | Discharging stops automatically when the battery falls to this SOC; |
Off-grid Operation
PV–Battery–Diesel Coordination
Feature Overview
When off grid, PV, the battery and the diesel generator work together automatically to supply power. Based on the battery level or the time of day, the system starts and stops the diesel generator automatically and charges the battery sensibly, keeping the off-grid supply stable whilst saving fuel.
What it does:
- With no grid available, PV, the battery and the diesel generator work together automatically to keep the supply continuous and stable;
- The system starts and stops the diesel generator automatically according to the battery level or the time, avoiding unnecessary running and reducing fuel consumption and maintenance costs;
- It makes full use of PV generation and battery storage, reducing reliance on the diesel generator and making off-grid supply greener and more economical;
This feature helps customers solve the following problems:
- Continuous, stable supply when off grid;
- Less unnecessary diesel generator running and lower fuel consumption;
- Priority use of PV and the battery for better economics;
Field descriptions:
| Field | Range | Data precision | Description |
|---|---|---|---|
| Diesel generator rated power (kW) | Range: 0-6553.5 | One decimal place | Sets the maximum output power of the diesel generator |
| Available diesel generator power (%) | Available diesel generator output = diesel generator rated power * available diesel generator power percentage | ||
| Control mode | Drop-down: SOC mode, Time-period mode, Manual mode | SOC mode: the diesel generator starts when the battery level falls below the start SOC and stops when the battery level rises above the stop SOC. | |
| Operating range | The diesel generator starts when the storage SOC falls below the minimum of this range and is cut off when it rises above the maximum | ||
| Power mode | Drop-down: Battery charging, Diesel generator output | Selects how the energy storage system operates when off grid or in PV–battery–diesel coordination: | |
| Battery charging power (kW) | Sets the power at which the storage battery charges |
Load Prioritisation
Feature Overview
Load prioritisation control gives priority to critical loads according to the battery level (SOC). When energy runs low, non-essential loads are disconnected first, then essential loads; once the battery level recovers, supply is restored in the same order. Essential loads are the last to be disconnected and the first to be restored.
Value relationships: non-essential load restore SOC > (essential load restore SOC / non-essential load disconnect SOC) > essential load disconnect SOC;
What it does:
- By allocating energy according to priority, it extends the supply time for critical loads when energy is scarce, improving the overall endurance of the system;
- Loads are switched automatically in stages, preventing the production or equipment risks of a single sudden outage — all without manual operation;
This feature helps customers solve the following problems:
- Critical loads stay powered;
- Longer endurance when energy is low;
- Avoids a sudden, site-wide loss of supply;
- Fully automatic control, with no need to switch loads manually;
Field descriptions:
| Field | Range | Data precision | Description |
|---|---|---|---|
| Non-essential load disconnect SOC (%) | Range: 5-100 | Integer | When the current battery level reaches the SOC value set here, the non-essential loads connected to the storage system are disconnected. |
| Non-essential load restore SOC (%) | Range: 5-100 | Integer | When the current battery level reaches the SOC value set here, the non-essential loads connected to the storage system are restored. |
| Essential load disconnect SOC (%) | Range: 5-100 | Integer | When the current battery level reaches the SOC value set here, the essential loads connected to the storage system are disconnected. |
| Essential load restore SOC (%) | Range: 5-100 | Integer | When the current battery level reaches the SOC value set here, the essential loads connected to the storage system are restored. |