Offgridtec Backup Kit 3-phase 7kWh with Pylontech US3000C battery Victron MultiPlus-II 48/5000

Offgridtec’s backup systems are ideal for emergency power supply or for expanding an existing solar system. In addition to lithium-ion batteries from Pylontech, the systems include a compatible MultiPlus-II inverter and a Cerbo GX MK2 from Victron Energy for system monitoring. This allows you to ensure your power supply even in the event of a power outage.

Thanks to its UPS function, the MultiPlus remains powered on even during a grid failure and continues to supply power to the connected loads. The switchover occurs so quickly (in less than 20 milliseconds) that uninterrupted operation of computers and other electronic devices is guaranteed.

Note: For the 7 kWh capacity version, the system can deliver or draw a maximum of 3.55 kW of power.

Applications of the Offgridtec Backup Kit:

• Emergency power supply
• Off-grid solar systems (stand-alone systems)
• Retrofitting of existing PV systems
• Grid-connected power supply
• UPS systems

What does the Offgridtec backup system include?

• Pylontech US3000C 3.5 kWh LiFePO4 battery ( 2, 4, or 6 units, depending on selection)
• 3x Victron MultiPlus-II 48/5000/70-50 230V unit combination
• 1x Victron Lynx Distributor
• 1x Victron Lynx Power In (M10)
• 1x Victron Cerbo GX MK2 control panel
• 1x Victron GX Touch 50 display panel for Cerbo GX
• 1x Victron MK3-USB Ve.Bus to USB Interface
• 1x 1.8 m VE.Can to CAN-Bus BMS Type A Cable
• 2x 0.9 m Victron RJ45 UTP cable
• 1x 3m Victron RJ45 UTP cable
• 3x 1-meter Offgridtec battery cables, 50 mm², M8 eyelets
• 1x Set of 5 MEGA fuses, 200 A, 70 V
• Pylontech battery connection cable set (1x, 2x, or 3x, depending on selection)

Expanded Use of Your Backup System

To set up an ESS (Energy Storage System) with the backup system, you’ll need one energy meter with a connection cable:

• Victron VM-3P75CT Energy Meter, 3-phase electricity meter, 75A/phase
• 5m Victron RJ45 UTP Cable

With this energy meter, you can set up a grid-tied installation and then monitor your energy consumption and manage your energy costs. Thanks to phase compensation, you can even use the 3-phase meter for 1-phase systems. This makes seamless integration of decentralized energy sources and loads into the existing power grid a breeze.

To ensure that an ESS can be included in the preconfiguration, the meter must be purchased in advance or at the same time as the system!

The Storage Solution – Pylontech US3000C Batteries

The US3000C storage unit is a latest-generation lithium battery. It was specifically designed to meet the high demands placed on backup storage systems. Thanks to state-of-the-art technology, maximum safety and a long service life are guaranteed, even with regular deep discharges.

• Extremely cycle-stable—over 6,000 cycles at 95% DoD
• Absolutely intrinsically safe lithium technology
• High charging and discharging performance possible
• Integrated BMS
• Very high energy density—lightweight and compact design
• Completely maintenance-free and long-lasting
• Pre-charge function to protect the ESS system from overvoltage

The electronic core – the Victron Multiplus-II unit combination

The Multiplus-II 48/5000/70-50 is a high-end unit combination from Victron Energy (MPN PMP482505010) that combines classic Multiplus components with an external current sensor and integrated anti-islanding function. This extends the PowerControl and PowerAssist functions to 100 A and broadens the potential range of applications to include ESS systems. The inverter module delivers a full 5000 W under non-linear loads, or 4000 W under continuous linear loads. The 48 V battery charger is also very well-proportioned with a charging capacity of 70 A and is complemented by a 50 A transfer switch that allows for lightning-fast switching back and forth between the AC connections.

Key Features of the Multiplus-II 48/5000/70-50

• PowerControl and PowerAssist – Boosting grid or generator power
• Built-in anti-islanding function and connection option for an external current sensor (optional)
• Can be used as a backup device in grid-connected systems to provide power during grid outages
• Suitable for use in various ESS (Energy Storage System) applications
• Ideally suited for professional maritime applications, yachts, vehicles, and off-grid land-based applications
• VE.Bus interface for parallel and three-phase operation, remote monitoring, and system integration
• Virtually unlimited power output through parallel and three-phase operation
• Can be configured on-site or remotely using VEConfigure software

Always enough power thanks to PowerControl and PowerAssist

On the MultiPlus-II 48/5000/70-50, a maximum grid or generator current can be set. The MultiPlus-II then takes other connected AC loads into account and uses only the “remaining” current to charge the battery. This prevents the generator or grid connection from being overloaded (PowerControl function). The PowerAssist function takes the PowerControl principle to a new level. Load peaks often occur only for a limited period of time. In such cases, the MultiPlus-II immediately compensates for insufficient generator, shore power, or grid output by drawing energy from the battery. When the load is reduced—that is, when loads are turned off—the energy that is then once again available in sufficient quantities can be used to charge the batteries.

Maximum flexibility thanks to two AC outputs

The main output ensures uninterrupted operation. In the event of a grid failure or an interruption in shore power or generator power, the MultiPlus-II takes over the power supply to the connected loads. The switchover occurs so quickly (in less than 20 milliseconds) that uninterrupted operation of computers and other electronic devices is guaranteed. The second output supplies power only when AC power is available at the MultiPlus-II’s input. Loads that must not discharge the battery, such as a water heater, can be connected to this output.

Remote Configuration and Monitoring

Install a Color Control GX or other GX products to connect to the Internet. Operating data can be stored and viewed free of charge on our VRM (Victron Remote Management) website. If systems are connected to the Internet, they can be accessed remotely and settings can be changed.

The MultiPlus-II is shipped unconfigured by default. You can find the configuration guide for the system here in the download section. If you would like us to pre-configure the system for you, we’d be happy to do so for an additional fee. To request this, add the item “Offgridtec Pre-configuration” (linked above) to your cart during the ordering process. In this case, shipping may take 3–5 business days longer while the configuration is being completed.

Technical Specifications

• 5,000 W power output under non-linear load 4,000 W continuous load and 9,000 W peak power
• for 48 V battery voltage, 50 A transfer switch, and 70 A battery charger
• Output voltage: 230 VAC, frequency: 50 Hz
• Max. efficiency is 95%, protection class IP22

System monitoring with the Victron Cerbo GX MK2 and GX Touch Display

With the Cerbo GX MK2 control center, you can easily control and monitor your system. The flexible connection options maximize your system’s performance. Thanks to the Cerbo GX MK2, you can control your system from anywhere. With the GX Touch 50 display, you always have all your system’s parameters at a glance and can make changes quickly and easily.

Safety Note: Have this complete system installed and commissioned only by a qualified electrician.