Deye SUN-8K-G05 8 kW 3-phase on-grid solar inverter

Deye SUN-8K-G05 is a three-phase transformerless string on-grid inverter, third in power of the four G05 models compared here (4, 6, 8 and 10 kW): rated output 8 kW (max. active power 8.8 kW), up to 10.4 kW of DC input, two MPPT inputs and a maximum efficiency of 98.3 %. It is meant for a solar PV system without a battery, where most of the electricity is used during the day.

Technical specifications

How the Deye SUN-8K-G05 differs from the 4, 6 and 10 kW models

All four models share 2 MPPT inputs (one string each), 13 + 13 A max. DC input current, 1000 V max. DC voltage, IP65 and 98.3 % max. efficiency. Housing depth and weight differ as well: the 4, 6 and 8 kW models are 330 × 457 × 185 mm and 10 kg, the 10 kW model is 330 × 457 × 205 mm and 11 kg.

Choose the 8 kW model if you plan up to 10.4 kW of panels. If less is enough, look at the Deye SUN-4K-G05 (4 kW) (up to 5.2 kW DC) or the Deye SUN-6K-G05 (6 kW) (up to 7.8 kW); for more panels, the Deye SUN-10K-G05 (10 kW) (up to 13 kW). Note that the 10 kW model starts at 250 V rather than 140 V, and its MPPT range is 200–850 V. We help to choose the right power according to your roof and consumption; the consultation before purchase is free.

What is an 8 kW 3-phase solar inverter for?

The Deye SUN-8K-G05 is an 8 kW three-phase on-grid inverter for sites that use electricity during the day: production, an office, a shop, or a farm with refrigeration or pumps. There, solar output and consumption coincide, so a battery is not always needed. Up to 10.4 kW of solar panels can be connected to this model (max. DC input power). If electricity is mostly used in the evening, it is worth comparing with a hybrid inverter: we have those too, and we will gladly work out which option suits your site better.

Can a battery be connected to the Deye SUN-8K-G05?

No, a battery cannot be connected to the SUN-8K-G05 on-grid inverter. Energy storage needs a hybrid inverter or a separate storage inverter. Without storage, in the evening when there is no sun, electricity is bought from the grid again. ESO (Lithuanian grid operator) states:

“Part of the surplus electricity generated can be stored in an energy storage device and used in the evening.”

ESO — Energy storage devices

How to connect solar panels to the SUN-8K-G05

The SUN-8K-G05 has 2 MPPT inputs with one module string each, every input accepts up to 13 A, and the maximum DC voltage is 1000 V. The inverter starts operating from 140 V, and the MPPT operating range is 120–850 V.

• Maximum DC input power: 10.4 kW.
• Maximum short-circuit current: 19.5 + 19.5 A.
• The string voltage must fit within the 120–850 V range and must not exceed 1000 V.
• DC connectors: MC-4 compatible, with an integrated DC switch.

The manufacturer does not name specific compatible modules, so we choose the number of modules and the wiring scheme for your roof and the modules you select.

Grid connection, monitoring and protections

The Deye SUN-8K-G05 connects to a three-phase grid: rated output voltage 3L/N/PE 380 V (323–418 V) or 400 V (340–440 V), rated AC current 11.6 A, maximum 12.8 A. Frequency 50 Hz, 60 Hz optional.

• Monitoring: LCD1602 display, RS485, RS232, Wi-Fi and LAN interfaces; remote software update and parameter changes.
• Functions: zero export and VSG applications.
• Protections: reverse DC polarity, AC short circuit, overcurrent, overvoltage, anti-islanding, plus an integrated DC switch.
• Enclosure: IP65, natural cooling, noise below 25 dB.

We handle it for you. We select the equipment for your site, deliver anywhere in Lithuania, install and connect it. The consultation before purchase is free.

Frequently asked questions

How many kW is the Deye SUN-8K-G05?

The Deye SUN-8K-G05 has a rated output power of 8 kW and a maximum active power of 8.8 kW.

Is the SUN-8K-G05 a hybrid inverter?

No, the Deye SUN-8K-G05 is a three-phase on-grid (string) inverter. A battery cannot be connected to it; if you need storage, Hybrid Energy will suggest a hybrid inverter.

How does the SUN-8K-G05 differ from the SUN-10K-G05?

The Deye SUN-8K-G05 differs from the SUN-10K-G05 in power: rated output 8 kW against 10 kW, max. DC input power 10.4 kW against 13 kW, rated AC current 11.6 A against 14.5 A. The DC start-up voltage (140 V against 250 V) and the MPPT range (120–850 V against 200–850 V) differ as well.

How many MPPT inputs does the SUN-8K-G05 have?

The Deye SUN-8K-G05 has 2 MPPT inputs with one string each, and the maximum DC input current is 13 + 13 A.

What is the maximum efficiency of the SUN-8K-G05?

Maximum efficiency is 98.3 %, European efficiency 97.5 %, and MPPT efficiency is above 99 %.

What is the maximum DC voltage and power of the SUN-8K-G05?

The maximum DC input voltage is 1000 V and the maximum DC input power is 10.4 kW.

Is the Deye SUN-8K-G05 suitable for a three-phase 400 V system?

Yes, the rated output voltage is 3L/N/PE 380 V or 400 V, and the rated AC current is 11.6 A.

Can the SUN-8K-G05 be installed outdoors?

The enclosure is rated IP65 and the operating temperature is −25 to 65 °C, but output is derated above 45 °C.

Does the SUN-8K-G05 have a zero export function?

Yes, the manufacturer lists zero export and VSG applications.

Does Hybrid Energy deliver and install the SUN-8K-G05?

Yes, Hybrid Energy selects the Deye SUN-8K-G05 for your site, delivers anywhere in Lithuania, installs and connects it.

Sources

• Deye SUN-4/5/6/7/8/10/12K-G05 Technical Data (manufacturer datasheet), checked 2026-10-26
• ESO – Energy storage systems, checked 2026-10-26