Multi RS Solar

AC input: The top left icon displays the AC input power. A negative value means that power in being exported to the grid.

Solar: This shows the total amount of PV power being produced. In case of more than one MPPT tracker then the power produced by each tracker will also be displayed.

AC output: The AC output power is displayed.

Battery: Below the battery graphic, the voltage, current and state of charge are shown.

AC Input: AC input power, current, power and frequency as shown. Negative values indicate that power is being exported.

AC Output 1: Shows the power, current, voltage and frequency at the AC output.

AC Output 2: This shows the same parameters as the AC output 1.

Solar: Displays the PV power, current and voltage of each tracker in this device.

Additionally, the total PV power of all MPPT trackers connected to the same VE.Can network are displayed.

Battery: The battery voltage, state of charge, current and DC ripple voltage are highlighted.

Relay: The status of the relay contacts is shown. If the relay mode is set to manual, then the relay can also be controlled here by tapping on the status dropdown at the right.

Up to 30 days of historic data is displayed.

Bar graphs show the solar yield in kWh. The shaded areas highlight the time spend in the different charging stages.

The "Solar panel" area records the total solar yield in kWh, maximum PV power and voltage.

Maximum and minimum battery voltages are stored in the "Battery" section.

If any errors were raised that day then they are shown with an orange circle.

Total energy consumption for the day is totalled in kWh.

Lifetime total energy produced by the connected Multi RS Solar. The totals can be reset and so "Since reset" keeps the record yield since then.

To export the graph as a .csv you can tap the triangular three dot icon at the top of the graph area. You'll then be presented with various methods by which to share the .csv (e.g. email, WhatsApp etc.).

Two different data points can be selected using the drop down menus just above the graph.

A graph will be rendered according to the selected parameters.

General: Define the general settings for the Multi RS Solar.

Grid: Grid disconnect and reconnect voltage limits can be set including the option to monitor the PE to neutral voltage.

Battery: Adjust the charging parameters for the battery.

Solar: Switch PV optimisation on or off and set custom names for each PV tracker.

Inverter: Set the output voltage of the inverter and the behaviour of the ground relay.

On/Off: There are more detailed options beyond the basic on/off capability of the physical switch.

Relay: Select from a variety of relay modes for the internal relay.

Aux input: Pick one function for each of the auxiliary inputs.

Display: Choose how the LCD backlight behaves and the preferred temperature unit.

AC input control: Provides various options to control when the AC input is connected or disconnected.

ESS: Setup the energy storage system mode, and settings related to each mode.

System: Designate how many units are in the system, and which phase they belong to.

Import settings from file: Import previously saved settings from a file in the settings library.

Save settings to file: Save the current settings to a file, which will be stored in the settings library. This file can be used as a backup to restore settings on this Multi RS Solar, or to easily apply the same settings to another one.

Share settings: Share the settings file via email or other social apps.

Product info: Displays the Multi RS Solar model number and serial number. There is also a switch to enable or disable Bluetooth.

Reset to defaults: Reset all settings to the factory defaults. This will mean that any customised settings will be lost. Setup will need to be performed again, or imported from a previously saved settings file.

Product: Shows the product name and the model number.

Serial number: Shows the serial number of the Multi RS Solar.

NEMA2000 device instance: Displays the network device instance number for this particular device.

Pin code: The Pin code is hidden but it can be changed using the change button to the right.

Custom name: Change the friendly name of the Multi RS Solar.

Firmware: Displays the current firmware version running on the Multi RS Solar.

Bootloader: The bootloader version.

Bluetooth: Enable or disable the Bluetooth functionality of the Multi RS Solar.

Instant readout via Bluetooth: Enable this setting to display the most important data of the Multi RS Solar on the Device list page.

Instant readout details: Tap "SHOW" to see the encryption data used for the Instant readout.

Lock product settings: Use this option to lock the settings of the Multi RS Solar with a password. This will prevent others from changing critical settings without the password.

Tap "Add lock" to proceed to the "Lock product settings" page.

Output frequency: Set the nominal output frequency that the Multi RS Solar will produce. Choose between 50Hz or 60Hz.

AC input type: Select the type of AC source that will be connected to the AC input of the Multi RS Solar. Choose between "Grid," "Generator," or "Shore power." If there is no AC input, then you can choose "Not available."

These settings are only used to change the input type on the VRM dashboard, they don't change the functionality of the Multi RS Solar.The icon and text will change accordingly. VRM will then be able to record the relevant energy source being used, and the corresponding graphs will show energy used from generator, or from grid, for example.

Choosing "Shore power" will display the input current limit on the VRM dashboard.

Moderate generator load changes: When enabled, sudden changes in the load on the AC output will be initially supplied by the battery. The load on the generator will then be increased more gradually, allowing it time to regulate its engine power.

Energy meter support: If you have an energy meter in the system, then you should enable this option.

AC current limit at energy meter: This field will only be visible if "Energy meter support" is enabled. Adjust the current limit at the point that the energy meter is installed.

Current limit at AC input: Adjust the current limit at the AC input of the Multi RS Solar.

Current limit overruled by remote: Enable this option to allow the current limit to be adjusted remotely. For example, a GX device can be used to adjust the current limit remotely.

It is not possible to remotely set the current limit any higher than the level defined here.

AC low voltage disconnect: The AC input will be disconnected when the voltage drops below this level.

AC low voltage connect: After a low voltage disconnect, the AC input will re-connect when the voltage rises above this level.

AC high voltage connect: After a high voltage disconnect, the AC input will re-connect when the voltage drops below this level.

AC high voltage disconnect: The AC input will be disconnected when the voltage rises above this level.

UPS function: Toggle this setting on to enable faster transfer from AC input to inverter power.

It may be necessary to disable this setting when using a generator. This is because the generator's output is less stable and may cause unwanted transfer to inverter when it is running.

Battery voltage: This option is always greyed out for the Multi RS Solar because it is only a 48V product.

Battery capacity: Input the capacity of the battery in Ah. This is important for the internal battery monitor to calculate the battery state of charge correctly. It also defines the dynamic cut off discharge current levels.

Max charge current: Adjust the maximum current that the Multi RS Solar will deliver to its battery terminals. By default, this is set to the maximum value. You may wish to reduce this if, for example, you have a smaller battery connected that cannot accept the maximum charge current.

Battery preset: Use this to select the battery charge algorithm.

Remote mode: Configure what is connected to the REMOTE_L and REMOTE_H inputs on the user connector.

Expert mode: This on/off toggle enables editing expert settings in case your equipment has special requirements

BMS controlled: This item is only visible in case the unit is controlled remotely by a BMS. This is automatically enabled when the Multi RS Solar detects that it is connected to a system with a BMS. Click this field to change.

A confirmation box will pop up. Select "OK" to reset BMS control. The Multi RS Solar will no longer be controlled by a BMS. BMS control will be automatically enabled the next time it is connected to a system that has a BMS.

Shutdown on low SOC: Toggle this setting on if you wish the Multi RS Solar to stop discharging the battery based on the battery state of charge as determined by the battery monitor.

Shutdown SOC level: Set the battery level that the Multi RS Solar will stop discharging the battery and the inverter will shut down.

Restart SOC level: When the battery is recharging again, and the SOC level rises above this value, then the Multi RS Solar will restart.

Dynamic cut-off: If this is disabled, then the low battery shutdown voltages will be at fixed levels defined below.

Low battery shutdown: Specify a fixed voltage at which the Multi RS Solar will shutdown.

Low battery restart & alarm: After a 30 second delay the Multi RS Solar will restart. After three restarts then the combined inverter/charger and MPPT solar charger will stop trying to restart and remain shutdown until it is reset or the Charge detect voltage level is exceeded.

This is also the voltage level at which a low battery alarm will be triggered.

Charge detect: If the Multi RS Solar has shut down due to low battery then the voltage must rise above this level before it will restart.

Enable dynamic cut-off: If this is enabled, then the low battery shut down voltages will be dynamic and will depend upon the present battery discharge current.

There are four different fields where you can set the cut-off voltage at increasing discharge current levels.

During the first 24 hours: Specify the voltage that the battery will be kept at for the first 24 hours, unless charging is resumed.

After the first 24 hours: If, after 24 hours, the battery voltage has not increased above the setting defined for the first 24 hours, then the battery voltage will be increased to the level set here.

Absorbtion voltage: Set the absorbtion voltage.

Float voltage: Set the float voltage.

Equalization voltage: Set the equalization voltage.

Storage voltage: Set the storage voltage. It is possible that the Multi RS Solar will have a continuous AC supply, and some battery types can be damaged by an extended float voltage being applied to them. The storage voltage can be set lower than the float voltage for extended storage times when the battery is not being cycled.

Automatic equalization: Set up the frequency of the auto equalize function. Available options are between 1 and 250 days.

Equalization is typically used to balance the cells in a lead battery and also to prevent stratification of the electrolyte in flooded batteries. Whether (automatic) equalization is necessary or not depends on the type of batteries and their usage. Consult your battery supplier for guidelines.

When the automatic equalization cycle has initiated, the charger applies an equalization voltage to the battery as long as the current level stays below the equalization current percentage setting of the bulk current.

In the case of all VRLA batteries and some flooded batteries, automatic equalization ends when the voltage limit (maxV) has been reached, or after a period equal to (absorption time/8), whichever comes first.

For all tubular plate batteries and also for the user-defined battery type, automatic equalization will end after a period equal to (absorption time/2).

For the lithium battery type, equalization is not available.

When an automatic equalization cycle is not completed in one day, it will not resume the next day. The next equalization session will take place according to the interval set in the 'Auto Equalization' option.

When an automatic equalization cycle is not completed in one day, it will not resume the next day. The next equalization session will take place according to the interval set in the 'Auto Equalization' option.

Manual equalization: Tap "Start now" to begin equalization immediately. The duration is limited to 1 hour. This should only be initiated during absorbtion or float stages and when there is sufficient sunlight.

Temperature compensation: Many battery types require a lower charge voltage in warm operating conditions and a higher charge voltage in cold operating conditions.

The configured coefficient is in mV per degree Celsius for the whole battery bank, not per cell. The base temperature for the compensation is 25°C (77°F), as shown in the chart below.

With a temperature sensor installed on the User I/O connection block, the actual battery temperature will be used for compensation throughout the day.

Low temperature cut-off This setting can be used to disable charging at low temperatures as required by lithium batteries.

For Lithium Iron Phosphate batteries this setting is preset at 5 degrees Celsius. For the other battery types it is disabled. When creating a user-defined battery, the cut-off temperature level can be adjusted manually.

Re-bulk voltage offset: Set the voltage offset that will be used over the float voltage setting that will determine the threshold that the charge cycle will restart.

For example, with a Re-bulk voltage offset off 0.4V and a float voltage setting of 54.0 V, the voltage threshold that will be used to restart the charge cycle will be 53.6 V. In other words, if the battery voltage drops below 53.6 V for one minute, the charge cycle will restart.

Absorbtion duration: Select "Fixed" or "Adaptive". When you tap on the box to the right a detailed explanation for each option will pop up.

Maximum absorbtion time: Set the absorption time limit. This is only available when using a custom charge profile.

Tail current: Set the current threshold that will be used to finish the absorption phase before the maximum absorption time expires. When the battery current gets below the tail current for one minute, the absorption phase will end. This setting can be disabled by setting it to zero.

Repeated absorbtion: Choose how often the automatic absorbtion stage should be repeated.

Setting the interval time to 0 will disable repeated absorbtion.

Repeated absorbtion duration: Adjust the length of time that a repeated absorbtion stage will be.

Equalization current percentage: Set the percentage of the Max charge current setting that will be used when equalization is performed.

Automatic equalization: If enabled, then the Multi RS Solar will perform an equalization stage automatically at a chosen time interval.

Equalization stop mode: Equalization can be set to either stop automatically when a chosen voltage level is reached or when a fixed amount of time has elapsed.

Maximum equalization duration: The maximum duration that an equalization stage will last in any case.

Manual equalization: Perform a manual equalization stage immediately. A manually triggered equalization stage will last for a maximum of one hour.

Peukert exponent: Adjust the Peukert exponent value to suit the battery type being used. Consult the battery specification sheet for the correct value. If the Peukert value cannot be found, then typical use values are 1.25 for lead acid batteries and 1.05 for lithium batteries. A value of 1.00 will disable the Peukert exponent calculation.

Charge efficiency factor: Due to charging losses, a battery will need more Ah to fully charge it again than the amount that was discharged from it. The default setting is 95%. Increase this value for batteries with a higher charge efficiency. For example, lithium batteries could be as high as 99%.

Discharge floor: This is the lowest level that the battery should be discharged down to. For example, lead acid batteries should not be discharged below 50%.

State of charge when bulk finished: Define the SOC of the battery as soon as the bulk stage is complete and the absorbtion voltage is reached.

Synchronize SOC to 100%: Force the battery monitor to state 100%. Only use this when you are sure that the battery SOC is actually 100% and you want the battery monitor to reflect this.

Partial shading detection: The default setting is enabled. It is recommended to leave this setting enabled. Only in some specific solar installations may it need to be disabled.

Each tracker can be given a custom name. The column on the left will always display the tracker number and the column on the right will show the custom name if given.

The custom name will also be shown on the LCD on the front of the Multi RS Solar.

Tap on the row to set a custom name.

Output voltage: Set the output voltage that the Multi RS Solar will produce when the inverter is running and the AC input is disconnected.

If the AC input is connected, then the output voltage will be the same as the input voltage

Ground relay: When enabled, the ground relay will close and create a Neutral-Earth bond when the AC input is disconnected and the inverter is running.

If this setting is disabled, then the ground relay will never close.

On: The Multi RS Solar will be on and fully functional. This is the default mode of operation.

Off: The device will be switched off even if the physical switch is on.

Charger only: This means that the inverter will be disabled and therefore the battery will not be discharged. Charging will be supplied by solar or AC input. If AC input is available, it will be transferred through to the AC output.

Inverter only: In this mode, the AC input will be disconnected by the internal input relays. The inverter will provide AC to the output. Charging will not be possible from AC, but charging from solar will be possible.

Pass through: AC at the input is transferred directly to the AC output. The inverter and the charger will be inactive. If AC input becomes unavailable then there will be no AC at the output either.

Relay mode: Tap in the box to select or change the mode of operation for the relay.

Minimum closed time: Specifies the minimum amount of time that the relay will remain closed for after being set by a condition.

Relay off delay: After an alarm condition has cleared, the relay will remain closed for this additional amount of time.

Alarm: The relay is closed when either a high battery voltage or low battery voltage is alarm is active.

Manual control: Use this option to control the relay manually from the Settings - Relay page or from the Status page.

Always open: The relay is not used and the contacts will always be open.

Inverting: The relay contacts will close when the Multi RS Solar is inverting.

Low battery voltage: The relay will close when the battery voltage falls below the set value.

Fan: The relay will close whenever the internal fan of the Multi RS Solar is running.

Charging: The relay will be closed when the charger is charging and the battery voltage is between the low and high voltage limits.

Generator control: Choose this mode for the relay contact to control starting and stopping a generator.

There are a number of conditions which can be set to start and stop the generator.

Any or all of the conditions can be enabled using the toggle switch for each condition.

Stop based on battery conditions: Define conditions by which to stop the generator. Select one of the conditions by which to stop the generator.

Minimum run time: Set an overall minimum run time for the generator. This is to prevent short cycling the generator.

Display backlight: Set up whether the front panel LCD backlight will be on or off.

Temperature unit: Select which temperature unit will be used by the front panel LCD.

Conditional AC input connection: Toggle this option on to enable conditional AC input connection.

AC input connect based on load: This option can be enabled to allow the AC input to be connected if the load on the AC output reaches a defined limit.

Connect when load is higher than: After the AC load increases above this limit then the AC input will connect.

Delay before connection: A delay can be set so that a certain amount of time can pass before the AC input connects due to a high load condition. Set this value to 0s if you don't want any delay.

Disconnect when load is lower than: After a high AC load condition and the AC load reduces to a more normal level again, the AC input can then be disconnected, and all of the load will be supplied by the inverter.

A lower threshold can be set to ensure that any higher than normal load fluctuations have passed before disconnecting the AC input.

Delay before disconnection: A delay for the disconnect limit can also be given.

Connect when SOC drops below: Change this field to enabled. In the popup box set the minimum SOC that the battery will reach before the AC input is connected.

Connect when battery voltage drops below: Tap this field and adjust the minimum voltage that the battery should reach before the AC input is connected.

Delay before connection: A delay can be defined before the AC input is connected when either of the battery conditions are met.

Disconnect AC input on: Tap this field and then choose a battery condition by which the AC input will be disconnected.

Disconnect when voltage is higher than: If "Battery voltage" is chosen in the previous field then you can define a battery voltage above which the AC input will be disconnected.

Delay before disconnection: When the AC disconnect condition has been met, a delay can be set before the AC input is actually disconnected.

ESS mode: The factory default is "Keep batteries charged." Tap in the box to choose a different ESS mode. See the table below for details.

Minimum discharge SOC: This is the lowest SOC that the battery will be allowed to discharge down to. Once this limit is reached then power for the loads will be supplied from the AC input.

Optimized with batterylife: When there is enough solar power to satisfy the loads, then the excess solar power will be used to charge the battery. The power stored in the battery will then be used when the solar power is not enough or during the night.

The batterylife algorithm will be active. This means that the minimum SOC level will gradually increase for each day that the battery is not fully charged. Once the battery gets fully charged then, the SOC level will reduce down to its originally set level.

This is suitable for lead acid battery chemistries.

Optimized without batterylife: As above, when there is enough solar power to satisfy the loads, then the excess solar power will be used to charge the battery. The power stored in the battery will then be used when the solar power is not enough or during the night.

Batterylife is not used, and so the minimum SOC level will remain at its preset level.

This "Optimised" mode is best for lithium batteries.

Keep batteries charged: In this mode, the batteries will be kept fully charged as long as the AC input is available. Loads will be supplied from the AC input. If there is enough solar power, then this will be used to supply the loads, and excess solar will charge the battery if it is not fully charged.

Use this mode in off grid installations to prevent feedback to a generator, which may be connected to the AC input.

This mode should also be used where grid is available, but feed in is not permitted.

External control: There may be use cases where an external ESS control is required. There will be no automatic control of the ESS setpoints. All ESS setpoints will need to be written from an external appliance.

System configuration: Select either standalone or a three phase configuration.

Phase selection: Choose which phase this current unit will be connected to. Each unit must be set to a different phase since only one unit can be allocated per phase.

Prevent CAN network islanding: Enables the CAN network islanding detection. The default setting is enabled.

Number of inverters in the system: This option will not be available if the above option "Prevent CAN network islanding" is not enabled.

If the CAN network is split into segments, this setting is used to determine the largest and shut down the smaller segment to prevent them from continuing on their own unsynchronised.

This results in a more reliable system than if the smaller segment tried to continue on its own unsynchronised (which will lead to overload or other less graceful shutdown issues caused by an unsynchronised AC output sine wave).

Minimum number of inverters to start: This is the minimum number of inverters which must be present per phase when starting the system. Given that there can only be one Multi RS Solar per phase, this should be set to 1.

Continue with missing phase: This is disabled by default. If enabled, then it would be possible for two other units to continue providing power to their respective phase.

System instance: Devices with the same instance number will work together as a group on the AC side.

If you change the System instance then you can have multiple groups of units on the same physical VE.Can bus operating independently. Different groups will not synchronise with each other.