FoxESS US Series - Introduction; Basic Features

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3. Introduction
3.1 Basic Features
US series is high-quality hybrid inverters which can convert solar energy to AC energy and store energy
into battery. The hybrid inverter can be used to optimize self-consumption, store in the battery for future
use or feed-in to public grid. Work mode depends on PV energy and user’s preference.
• System advantages:
- Easy installation: flexible configuration, plug and play set-up
- High Voltage：compatible with high-voltage batteries for maximum round-trip efficiency.
- Type 4X: engineered to last with maximum flexibility, and suitable for outdoor installation.
- Remote monitoring：monitor your system remotely via smartphone app or web portal.
- 100% imbalance for Split-Phase Loads.
- High backup power, up to 12.5kW.
- High scalability, up to 4 inverters in parallel.
- Fast battery charging, up to 50A changing and 60A discharging current.
- RSD transmitter inside: a Tigo or APsystem transmitter is integrated in the inverter ， and
only RSD receivers should be installed by the installer.
- RGM inside：a 0.5% accuracy revenue grade meter (RGM) is integrated in the inverter and FOX
Hub to finance the solar array.
- UPS switchover time: the switchover time from on-grid to off-grid or from off-grid to on-grid is
less than 15ms.
- Generator ready: the FOX Hub is ready to connect to an up to 200A generator.
- Smart loads: 240V or 120V loads can be connected to the FOX Hub and controlled according
to the time and SOC.
- Safety&Reliability: transformerless design with software and hardware protection.
- Arc detection function: capability of detecting up to 35A arc current. When the PV panel
produces arc, the inverter will shut down immediately, disconnect the grid side relay, BDC relay
will send shutdown instructions to the battery to disconnect the battery. Meanwhile, turn off the
quick shut-off device (RSD) to avoid the fire of the PV panel. After the arcing occurs, the inverter
will report the arcing fault immediately and upload it to the cloud.
• Work modes:
Work modes
Description
Self-use
(with PV Power)
Priority: load>battery>grid
The energy produced by the PV system is used to optimize self-consumption.
The excess energy is used to charge the batteries, and then exported to gird.
Self-use
(without PV Power)
When no PV supplied, battery will discharge for local loads firstly, and grid will
supply power when the battery capacity is not enough.
Time-of-use
Priority: battery>load>grid (when charging)
Priority: load>battery>grid (when discharging)
This mode applies the area that has electricity price between peak and valley.
User can use off-peak electricity to charge the battery.
The charging and discharging time can be set flexibly, and it also allows to
choose whether charge from the grid or not.