Low-Voltage PV Storage Kit: Deye SUN-8kW 3-phase hybrid inverter – 3x Deye SE-F5C Pro 15.36 kWh

The comprehensive package for maximum independence

This low-voltage storage kit from Deye combines the three-phase hybrid inverter SUN-8K-SG05LP3-EU-SM2 with three SE-F5 Pro lithium iron phosphate battery modules to form a total storage capacity of 15.36 kWh. This makes the set particularly suitable for households with high electricity consumption, such as those with a heat pump, electric car or home office, and for anyone who wishes to be as independent as possible from the grid, even at night and on overcast days. The inverter and batteries are from the same manufacturer and communicate directly with each other via CAN or RS485, which significantly simplifies installation and commissioning.

Deye SUN-8K-SG05LP3-EU-SM2: Powerful and flexible

The hybrid inverter delivers 8 kW nominal power (max. 8.8 kVA) in three-phase configuration and is designed for connection to large PV generators: up to 16 kW of PV power can be connected, with a maximum DC input power of 12 kW. This is a particular advantage when combined with the large storage system, as surplus solar power can be fed entirely into the batteries during the day. Two MPP trackers, each with a 20 A input current and a wide voltage range of 200 to 650 V, ensure maximum yield even from roofs with varying orientations, such as east/west. With an efficiency of up to 97.6 % and an MPPT efficiency of over 99 %, virtually no energy is lost.

For the battery, up to 190 A of charging and discharging current are available. In the event of a power cut, the inverter continues to supply your home in off-grid mode, briefly providing double the rated power for 10 seconds, enough to cover the start-up currents of pumps or compressors. With 15.36 kWh of storage capacity, you can also bridge longer outages. The 100 % asymmetrical output allows up to 50 % of the rated power per phase, which is a real advantage in everyday use where loads are unevenly distributed.

Furthermore, the inverter offers AC coupling for retrofitting existing PV systems, the integration of a diesel generator, six freely configurable time slots for charging and discharging (ideal for dynamic electricity tariffs), and the parallel connection of up to 10 units in both on-grid and off-grid operation. The IP65-rated housing allows for an operating temperature range of -40 to +60 °C, and at under 55 dB(A), the unit operates pleasantly quietly. The grid connection complies with VDE-AR-N 4105.

Deye SE-F5 Pro (Config C): Safe LiFePO4 battery with display

The SE-F5 Pro modules utilise durable and thermally stable lithium iron phosphate (LiFePO4) cells. Each module provides 5.12 kWh at 51.2 V and 100 Ah. The C version features a display showing the battery status in real time. The advanced BMS with active fuse and the integrated circuit breaker ensure comprehensive protection.

With at least 6,000 cycles, a guaranteed energy throughput of 16 MWh and a 10-year manufacturer’s warranty per module, the storage system is designed for long-term, cost-effective operation. As the inverter’s charging and discharging current is distributed across three modules, each individual module operates at significantly less than its permissible continuous current of 100 A, which further protects the cells. The storage system can be expanded to up to 32 modules in parallel (or even 64 with a CAN box) and can be mounted on the wall, on the floor or stacked. Using the optional Wi-Fi/Bluetooth module and the Deye app, you can monitor the batteries locally or remotely, together with the inverter.

Your benefits at a glance

You will receive a fully coordinated complete kit from a single source, featuring 8 kW three-phase power, up to 16 kW PV connection capacity and a generous 15.36 kWh storage capacity. The emergency power capability provides protection even during prolonged grid outages, the LiFePO4 technology with a 10-year warranty ensures longevity, and both the battery and the inverter can be flexibly expanded. The 48 V low-voltage technology also offers greater safety during installation and maintenance than high-voltage systems.

Contents of the package

1x Deye SUN-8K-SG05LP3-EU-SM2 3-phase hybrid inverter
3x Deye SE-F5 Pro LiFePO4 battery module, Config Version C with display (5.12 kWh each)
 

FAQs on the Deye Low-Voltage PV Storage Kit: 8 kW inverter with 15.36 kWh storage

Which households is this kit suitable for?
The kit is designed for detached houses with a three-phase grid connection and high electricity consumption, for example those with a heat pump, an electric car or several people working from home. With 15.36 kWh of storage, evening and night-time consumption can, in many cases, be covered entirely by the home’s own solar power. For households with lower consumption, the version with two storage modules (10.24 kWh) is often the more economical choice.

How much PV capacity can I connect to the inverter?
The SUN-8K-SG05LP3-EU-SM2 supports a PV connected load of up to 16 kWp; the maximum DC input power is 12 kW. The modules are distributed across two MPP trackers, each with one string, with an input current of up to 20 A and an MPPT voltage range of 200 to 650 V. To ensure that the large storage system can be fully charged even during the day, a suitably sized PV system is recommended. The maximum DC input voltage of 800 V must not be exceeded, even at low temperatures, which is why string planning should be carried out by a specialist contractor.

How much storage capacity is actually available?
The total capacity is 15.36 kWh (3 × 5.12 kWh). Deye recommends a depth of discharge of 90 %, which provides around 13.8 kWh of usable energy for everyday use. This reserve protects the cells and extends their service life.

Does the system still work during a power cut?
Yes. In the event of a grid failure, the hybrid inverter can continue to operate in off-grid mode and supply your home with three-phase power from the battery and PV system. For a short period, it can even provide double the rated power for 10 seconds, for example to cover the start-up currents of pumps or compressors. Thanks to its large storage capacity, it can also effectively bridge longer outages. This requires the emergency power consumers to be wired appropriately during installation.

Does the third storage unit also provide more power?
The third battery primarily increases the capacity, i.e. how long you can use electricity from the battery. The charging and discharging current is limited by the inverter to a maximum of 190 A. There is, however, one advantage: the current is distributed across three modules, so that the load on each individual module is reduced, which can have a positive effect on their service life.

Can I expand the storage system further at a later date?
Yes. The SE-F5 Pro modules can be expanded in parallel to up to 32 units, and with a CAN box even up to 64. The inverter can also be operated in parallel with up to 10 units if you require more power at a later date.

Can I install the batteries outdoors or in the garage?
The inverter has an IP65 protection rating and is suitable for outdoor installation. The battery modules, on the other hand, have an IP21 protection rating and must be housed in a dry indoor space, such as a cellar or utility room. Please also note that the batteries can only be charged at temperatures between 0 and 55 °C; charging is therefore restricted in unheated rooms where frost is a risk.

How long do the batteries last?
Deye It specifies a cycle life of at least 6,000 cycles (at 25 °C down to 70 % of residual capacity). Assuming one full cycle per day, this equates to over 16 years. In addition, Deye offers a 10-year warranty or 16 MWh of energy output per module; the manufacturer’s warranty conditions apply.

Can I retrofit an existing PV system?
Yes. The inverter supports AC coupling, meaning that an existing PV system with its own inverter can be integrated. This also allows an older system, for example, once EEG subsidies have ended, to be supplemented with a large storage unit.

Can I connect a generator?
Yes, the inverter supports the integration of a diesel generator, for example for off-grid applications or as an additional safeguard during prolonged power cuts.

How do I monitor my system?
Using an optional data logger module (Wi-Fi, Bluetooth, 4G, GPRS or LAN), the system can be monitored via the ‘ Deye ’ app. The batteries can also be read locally via Bluetooth, without the need for an internet connection. In the app, you can view generation, consumption, grid consumption, feed-in and state of charge in real time.

Can I install the kit myself?
No. Installation and commissioning must only be carried out by a qualified electrician. The system must also be registered with the grid operator and entered in the market master data register. The inverter complies with the VDE-AR-N 4105 standard required in Germany.