Deye solar inverters: UK residential range and specifications

Deye is a fast-growing Chinese inverter maker whose SUN hybrid range has become a common sight in UK homes. The company behind it, Ningbo Deye Inverter Technology Co., Ltd, is part of a group established in 1990 that makes solar inverters alongside air conditioning controllers, solar water pump controllers and heat pump air conditioners¹. For a UK householder, the relevant products are the single-phase SUN hybrid inverters, running from 3.6kW to 8kW, which convert the panels' DC output into alternating current for the house wiring and manage a battery alongside it³.

The range matters for energy independence because a hybrid inverter is the box that decides where solar power goes: to the house loads first, to the battery when there is surplus, and to the grid only when you allow it⁵. Deye's warranty runs 5 years, with a 10-year option, from the date of installation⁶. What follows sets out the models, the battery rules, the grid connection process and what the system does and does not free you from.

What Deye makes: inverters and much more besides

An inverter is the device that connects solar panels to the main wiring in the house, converting the DC electricity the panels produce into the alternating current the home uses⁹. Deye's core business for UK households is that job done by a hybrid inverter, which handles both the solar conversion and battery charging in one unit. But the company is broader than inverters: Deye Technology Group's products include solar inverters, variable frequency air conditioner controllers, DC solar water pump controllers, heat pump air conditioners and other products².

That breadth shapes the ecosystem around the inverter. Deye makes a Smart EV Charger that connects directly to the inverter, a solar air conditioner line that debuted at IFA 2026 in Berlin, and pump controllers for off-grid water work¹¹. Its full series string inverters support VSG application, and Deye states that when the grid fails, its string inverter is able to work with a diesel generator directly without any additional EMS device, with a frequency droop feature that makes it usable in poor grid areas¹.

For the household, the practical point is that buying a Deye inverter buys into a wider system of Deye-branded equipment, all engineered by one manufacturer in Ningbo, China. The SUN hybrid models sold in the UK carry EU Declarations of Conformity issued by Ningbo Deye Inverter Technology Co., Ltd, dated between September 2023 and January 2025 for the various families.

Single-phase SUN inverters and their capacities for British households

The single-phase SUN range is what fits most UK houses. The SUN-3/3.6/5/6K-SG04LP1-EU is described by Deye as a single-phase hybrid inverter covering 3 to 6kW, with 2 MPPT trackers and low-voltage battery support³. The SUN-3.6/5/6K-SG03LP1-EU covers the same 3.6 to 6kW band with a slightly different feature set, including support for storing energy from a diesel generator⁵. Above that, the SUN-7.6/8K-SG02LP1-EU-AM2 extends the single-phase line to 7.6 and 8kW¹².

Deye's approved battery list names the full model families: SUN-3.6/5/6/7.6/8K-SG01LP1-EU, SUN-3.6/5/6K-SG03LP1-EU, SUN-3/3.6/5/6K-SG04LP1-EU, SUN-3.6/5/6/7.6/8K-SG05LP1-EU, and the three-phase SUN-5/6/8/10/12K-SG04LP3-EU, SUN-12/14/16K-SG01LP1-EU and SUN-14/15/16/18/20K-SG05LP3-EU-AU-SM2⁴. The three-phase models are for larger homes and light commercial premises; the UK residential market for this class of inverter runs single-phase systems from 3.6kW to 8kW, with three-phase from 8kW upward for bigger demands¹³.

Sizing interacts with the grid connection rules: a single-phase fast track application is available where inverter capacity is 3.68kW generation and 3.68kW storage per phase, with total export limited by a G100 device to 3.68kW⁸. Larger installations exceeding 3.68kWp require a G99 application⁷. More on sizing a system is in what size solar system a home needs.

Matching SUN models to compatible battery storage

Deye publishes approved battery lists, and the rule is simple: only batteries on the list are confirmed compatible with the named inverter models. The 2025 list covers the SUN families above and names approved brands and models, including SACRED SUN's SSIF2P15S48100C, FCIFP48100A and SSIFP48100A, and ACE's R48100⁴. An earlier 2024 list covers a similar model set¹⁴. Deye's own warning is worth taking seriously:

On battery chemistry, the SUN-3.6/5/6K-SG03LP1-EU supports lead-acid or lithium-ion, and supports multiple batteries in parallel, so a storage bank can grow over time⁵. The same model can AC couple to retrofit an existing solar system, meaning a home with panels already installed can add a Deye hybrid and battery without replacing the original string inverter⁵. For comparison, Sunsynk, another brand in this market segment, states its inverters are optimised for its own LiFePO4 batteries and guaranteed compatible across its entire battery range¹³; Deye's approach is a published list rather than a single-brand pairing.

The practical independence point: the battery is what turns solar generation into evening supply. Deye's own description of the energy flow is that during the day the PV system generates electricity which is provided to the loads initially, then the excess energy charges the battery via the hybrid inverter, and stored energy is released when loads require it¹⁵. Guidance on adding storage is in adding battery storage to a solar system.

Topology: what 'non-isolated' means in practice

The SUN-3.6/5/6K-SG03LP1-EU datasheet lists the inverter topology as non-isolated⁵. In plain terms, a non-isolated inverter has no galvanic separation transformer between the panels' DC side and the house AC side; the two sides share a common electrical path. This is the normal design for modern transformerless inverters, and it is what allows the compact size and higher efficiency these units achieve. The consequence is that DC and AC are not electrically separated inside the unit, which is one reason installation standards, earthing and DC isolation matter so much; those requirements are covered in solar PV safety.

Inverters as a product class carry the decisive voltage class DVC C in the official product specification context, which is the classification that determines the safety testing regime applied to them¹⁶. The inverter's job itself is unchanged by topology: it converts the DC into an alternating current, and connects the panels to the main wiring in the house⁹.

One related design choice worth understanding is inverter architecture at panel level. Micro-inverters separate the panels so that if one panel fails, the whole system is not affected¹⁷. A Deye SUN is a string hybrid, the opposite approach: panels are wired in strings into one unit, so panel-level faults affect the string, but the reward is battery integration and backup capability in a single box. The trade-offs are set out in string inverters and hybrid inverters.

Deye grid approvals and G99 documentation for the UK

Connecting a solar and battery system to the grid follows a fixed process, and the inverter's certification is central to it. For larger installations exceeding 3.68kWp, a G99 application to the local distribution network operator is required⁷. The fast track process is available for installations onto a single-phase connection where inverter capacity is 3.68kW generation and 3.68kW storage per phase, and total export is limited by a G100 device to 3.68kW⁸. In all cases, any generating units, including electricity storage, connected through this process must use EREC G99 or G98 Type Tested inverters¹⁸.

The Type A band under EREC G99 covers a registered capacity of each power generating module above 16A per phase but less than 1MW, with the connection point below 110kV, in practice 66kV or below in Great Britain¹⁹. In Northern Ireland, the G99 fast track application requires a compliance certificate with test results for the inverter²⁰.

On the Deye side, the company's certificate catalogue lists an England G99 certificate for the SUN-(7-10.5)K-G02P1-EU-AM2 single-phase string inverter, added on 16 September 2026, alongside the EU Declarations of Conformity for the hybrid families¹. The practical sequence for a householder is: the installer confirms the inverter is Type Tested to the required standard, the application goes to the network operator before connection, and the certificate is part of the paperwork. The full process is explained in connecting solar to the grid: G98 and G99, and export limiting in export limitation and G100.

Other Deye products: EV charging points, cooling and pumping

Deye's ecosystem extends past the hybrid inverter into equipment that uses the solar power it manages. The Deye Smart EV Charger can be directly connected to any AC port of the inverter and is controlled by the inverter via LoRa communication, so charging follows the solar generation without a separate control system¹¹. Deye's certificate catalogue lists EN IEC 61851, RED and CB IEC 61851 certificates for its SUN EV charger models, added on 18 August 2026¹.

The solar air conditioner line is a hybrid AC/DC product, running on solar DC input with grid AC backup, and Deye states it debuted at IFA 2026 in Berlin². The group also makes DC solar water pump controllers, aimed at off-grid and agricultural water pumping rather than UK housing². More broadly, home energy management systems can integrate EV chargers, heat pumps and PV diverters²¹, and a diverter can be integrated with electric water heaters or immersion heaters to send surplus solar directly into hot water, which increases self-consumption, reduces electricity bills and enhances the overall efficiency of the installation²².

For a household, the significance is that the inverter becomes the hub of a wider energy system rather than a lone box. Each added device deepens the manufacturer relationship as well as the independence, since the equipment is designed to work together under Deye's own control and monitoring. Diverters in general are covered in solar diverters.

What a Deye inverter means for household energy independence

A Deye hybrid inverter gives a household real control over where its solar power goes, through three operating modes Deye documents. In Selling First mode, the hybrid inverter sells back any excess power produced by the solar panels to the grid¹⁵. In Zero Export To Load mode, the built-in CT detects power flowing back to the grid and reduces the inverter's power to supply only the local load and charge the battery; the inverter will neither provide power to the home load nor sell power to grid, supplying only the connected backup load¹⁵. In Zero Export To CT mode, an external CT is needed, and the inverter provides power to both the backup load and the home load, taking grid energy as a supplement when PV and battery power are insufficient¹⁵. All Deye hybrid inverters can be upgraded to support the Smart Energy Management System, which adds wireless zero export control²³.

The independence gains are concrete: stored solar used in the evening, backup loads kept running, and export only when chosen. More homegrown energy means greater energy independence²⁴. The dependencies that remain are equally concrete. The house stays connected to the grid and to a network operator whose connection rules govern the install; the warranty and support run to the manufacturer in China, whose terms state that Deye does not offer installation service, that Deye takes on freight costs for products under warranty but customers take on customs clearance costs, and that OEM products are not covered by these warranty terms⁶. Warranty exclusions include breaking the product seal, incorrect installation or commissioning, unauthorised modifications and insufficient ventilation⁶. Monitoring through the Deye app is stated to need no internet for local use²³, but remote features tie the household to the manufacturer's platform.

The honest summary: a Deye SUN system shifts a home from buying all its electricity to generating, storing and managing most of it, while leaving the grid as backup, the network operator as gatekeeper and the manufacturer as the long-term service counter. The wider picture is in solar panels and household energy independence.