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When you receive your MultiPlus-II 230V, it comes with a set of standard factory settings that are generally suitable for single-unit operations.

Here’s a breakdown of these settings and what you should consider checking:

Inverter and Input Settings:

• The inverter frequency is set to 50 Hz, which is standard for many regions.

• The input frequency range it can accept is between 45 and 65 Hz.

• The input voltage range is broad, from 180 to 365 VAC, accommodating various grid conditions.

• The inverter output is set to a standard European voltage of 230 VAC.

Charging and Battery Settings:

• The charger is enabled by default.

• The battery charge curve is configured to a four-stage adaptive mode with BatterySafe to protect against overcharging.

• The charging current is set to 100% of the maximum the unit can handle, but ensure this is suitable for your specific battery bank.

• The factory settings are optimized for Victron Gel Deep Discharge batteries, and while they’re also suitable for AGM Deep Discharge types, you should verify this against your battery manufacturer’s recommendations.

Voltage Settings for Charging:

• Absorption voltage is set to 28.8V for 24V systems and 57.6V for 48V systems, which are typical values for lead-acid batteries.

• The float voltage follows at slightly lower values, and storage voltage is set, not adjustable, to prevent over-discharge during storage.

Safety and Operation Modes:

• Ground relay is on, ensuring the inverter is grounded correctly for safety.

• Bulk protection is enabled to protect your batteries during the bulk charging phase.

• The UPS feature is on, allowing for uninterrupted power supply during grid outages.

Current Limits and PowerAssist:

• The AC input current limit is set at 32A for the 3kVA model. This is adjustable and should be verified to match your AC source capabilities.

• PowerAssist is enabled, allowing the inverter to supplement grid power with battery power during peak demand.

6. Preliminary Checks and Adjustments:

• Battery Compatibility: Before using your MultiPlus-II, verify that the default charging voltages align with your specific battery type. This is crucial because incorrect charging settings can reduce battery life or cause damage.

• Programmable Relay: The programmable relay is set to an alarm function by default. Depending on your needs, you may want to reconfigure this relay for other uses, such as a generator start/stop mechanism.

• System Configuration: Check if your system requires a stand-alone, parallel, or 3-phase setup. The unit is set to stand-alone by default, but this may need to be changed depending on your system design.

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Yes, when the mains are unavailable, the MultiPlus-II slightly increases the AC frequency. This increase is a signal for the solar inverter to reduce its output. This way it ensures that your system doesn’t produce more power than it can store or use, even during a power outage.

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The blinking ‘mains on’ LED in PowerControl mode on your MultiPlus-II 230V is an important function indicator.

Here’s what it means:

• PowerControl Mode: This mode helps manage the inverter/charger’s interaction with limited AC input sources, like a weak grid or a small generator.

• AC Input and Output: When in PowerControl mode, the AC input is passed through to the charger and the connected loads. However, the total AC output current is limited to the preset maximum input current that you’ve set.

• Charge Current Management: Interestingly, in this mode, the charger will reduce its charging current to zero Amps (0A) if needed. This is done to ensure that the total current does not exceed the preset limit, especially when the load on the AC output increases.

• Why It Matters: The blinking LED alerts you that the inverter/charger is actively managing the power to avoid overloading the AC input source. It’s ensuring that the power drawn does not exceed what your grid or generator can handle.

• Real-World Impact: This is particularly useful in scenarios where your AC source can’t provide enough current for both charging the batteries and powering the connected loads. The PowerControl feature prioritizes the loads, ensuring uninterrupted power supply, while temporarily halting battery charging to maintain balance.

In summary, the blinking ‘mains on’ LED in PowerControl mode is a sign that your MultiPlus-II is smartly managing the power to prevent AC input overload, ensuring efficient operation of your system without tripping your power source.

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The PowerAssist feature can add up to 3kVA to the output during peak power requirements.

This means, in addition to the maximum input current of 32A, the MultiPlus-II can supply a total of up to 45 A to the output, accommodating moments of high demand.

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Devices connected to AC-out-2 will be immediately disconnected when the MultiPlus-II switches to battery operation.

This is designed for non-essential loads that should only operate when external AC power is available, such as an electric boiler or air conditioner.

Once AC power is restored to AC-in-1, the MultiPlus-II will reconnect the load to AC-out-2 after a delay of approximately 2 minutes, allowing for stabilization of a genset if one is being used.

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Yes, you can create a split-phase system using the MultiPlus-II 230V along with a separate autotransformer.

This setup is particularly useful if you need to split a single-phase power source into two separate phases, commonly used in North American residential power systems.

You’ll need to connect the MultiPlus-II to an autotransformer, which you can find detailed guidance for on the Victron Energy Autotransformer product page.

The autotransformer effectively splits the single-phase output of the MultiPlus-II, allowing you to power devices that require a split-phase supply.

Remember, configuring a split-phase system can be complex, so it’s advisable to seek help from a professional or refer to detailed instructions provided by Victron Energy.

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The ‘Charger’ section within the VictronConnect app is dedicated to configuring the charging parameters of your MultiPlus inverter/charger. These settings provide detailed control over how your MultiPlus charges connected batteries, ensuring safety, efficiency, and longevity of the battery bank. Here’s a breakdown of each setting within this section:

• Enable charger: This toggle switch allows you to enable or disable the charging function of the inverter/charger.

• Charge current: This setting specifies the maximum current that the charger will use to charge the battery. Adjusting this can affect charging speed and efficiency.

• Absorption voltage: This is the target voltage level to which the battery will be charged during the absorption phase. It’s a critical parameter for ensuring the battery is charged fully without overcharging.

• Float voltage: After the battery reaches the absorption voltage, the charger will maintain this lower float voltage to keep the battery at 100% charge without overcharging.

• Repeated absorption interval: This setting determines how often the charger will re-enter the absorption phase to “refresh” the battery, helping to maintain its charge over time.

• Repeated absorption time: Defines the duration for which the charger will stay in absorption mode during each refresh cycle.

• Maximum absorption time: This is the maximum time the charger will spend in the absorption phase in one cycle to prevent excessive charging.

• Temperature compensation: This feature adjusts the charge voltage based on battery temperature to prevent undercharging or overcharging in extreme temperatures.

• Charge curve: Allows you to select the charging algorithm. The ‘Adaptive’ option enables the charger to adjust the charging parameters based on the battery’s performance and history.

• BatterySafe: When enabled, it prevents damage to the battery by limiting the rate of voltage increase during the initial bulk charging phase.

• Lithium batteries: This switch enables settings optimized for charging lithium-ion batteries, which have different requirements than lead-acid types.

• Storage mode: When the battery is fully charged and not being heavily used, this mode maintains a reduced voltage level to limit gassing and corrosion, prolonging battery life.

• Use equalization: This setting, typically used for flooded lead-acid batteries, allows for periodic overcharging to balance the cells and mix the electrolyte.

• Weak AC input: To be selected when the AC input source is not stable or is of low quality to ensure proper charging.

• Stop after excessive bulk: A safety feature that stops the charger if the bulk phase takes too long, indicating a potential issue with the battery or the charging process.

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Yes, when you’re looking to connect your VE.Bus Inverter/Charger to an Android device, you need an additional piece of equipment called an OTG (On-The-Go) cable.

This cable is necessary to convert the standard USB connection from the MK3-USB to the data port of your Android device.

The specific type of OTG cable you’ll require depends on the type of data port your Android device has. Most modern Android devices use either a micro-USB or a USB-C port. Here’s what you need to do:

• Identify the data port on your Android device (micro-USB or USB-C).

• Obtain the corresponding OTG cable that matches your device’s data port.

• Connect the OTG cable to your Android device and then attach the USB end from the MK3-USB to the OTG cable.

Please note that Victron does not provide the OTG adapter with their products, so you will need to purchase this cable separately. You can easily find OTG cables online or at electronics stores. Once you have this set up, you should be able to connect your Android device to the inverter/charger for configuration or status checks.

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The ‘Dynamic current limit’ setting in the VictronConnect app is a feature designed to work with smaller generators that may have a slower response time to changing loads, such as the HONDA EU series of inverter-generators.

Function:

• This setting allows the inverter/charger to dynamically adjust the shore current limit.

• When the current draw is low for a certain period, the system automatically reduces the current limit.

• This preemptive reduction compensates for the generator’s engine reaction time, preventing the generator from being overloaded when a higher demand suddenly occurs.

Use Case:

• The typical use case for the ‘Dynamic current limit’ is when you’re using a smaller generator that can’t ramp up quickly enough to meet sudden, large demands for power.

• By reducing the current limit dynamically, the inverter/charger helps to avoid overloading the generator when a large load is switched on, which could cause the generator to stall or the inverter/charger to disconnect from the generator due to overcurrent protection.

Advantages:

• The advantage of using this feature is that it provides a smoother operation when connected to a small generator, ensuring that the power supply is not interrupted and the generator is not subjected to stress that could shorten its lifespan or require unnecessary maintenance.

To summarize, ‘Dynamic current limit’ is a smart setting that helps protect both the generator and the inverter/charger by adapting to the load conditions and the generator’s capabilities, ensuring reliable operation of your off-grid power system