- Hybrid inverter and LiFePO4 battery brand, manufactured in China, with a strong installer base in South Africa and a growing presence among UK solar installers
- Inverter range runs from around 3.6kW single-phase units up to around 16kW, with larger three-phase options for bigger homes
- Own-brand battery modules commonly start at around 5.12kWh to 5.32kWh per unit and are designed to be stacked across several units in parallel
- Many Sunsynk inverters also support third-party batteries, such as Pylontech, BYD and Dyness, alongside Sunsynk's own modules
- Sunsynk Connect is the brand's monitoring and control app, with live generation, battery and consumption data plus remote settings
Independent coverage
This page reflects our own independent assessment of Sunsynk, not a sponsored placement. If we later add affiliate links to Sunsynk's site, any commission we might earn does not change what we say about the brand here.
Who is Sunsynk
Sunsynk is a brand of hybrid solar inverters and lithium battery storage systems. The brand says it holds trademark protection in more than 40 countries. It has built a particularly strong position in South Africa, where frequent power cuts have driven strong demand for backup-capable hybrid inverters; installers there rank Sunsynk among the most widely fitted brands. In the UK, Sunsynk has built a newer but growing presence through electrical wholesalers and solar installer networks. Installers generally position it as a competitively priced alternative to some of the more established names on this site.
Sunsynk’s UK operating company was incorporated in 2013, originally under the name Global Tech China Limited, and adopted the Sunsynk name in September 2021. UK Companies House records list Keith Gough, now the brand’s Executive Chairman, as a director since incorporation. Trade press and industry directories describe Sunsynk as headquartered in Hong Kong, with its UK business run from Wrexham in Wales and its hardware manufactured in China. The brand is privately held: a new UK holding company, Sunsynk Group Limited, was set up in 2023, and a new chief executive, Matthew Hickin, was appointed in 2024. However, no external parent company or investor is named in public filings.
Sunsynk’s hybrid inverters are manufactured by Ningbo Deye Inverter Technology Co., Ltd under an OEM arrangement. Independent industry comparisons report that Sunsynk and Deye-branded inverters share identical core hardware and circuit board designs. The differences are limited to casing colour, user interface and firmware.
The Sunsynk product range
Sunsynk’s core business is hybrid inverters: the devices that manage solar input, battery charging, and grid or backup power. Installers sell them either on their own or bundled with Sunsynk’s own LiFePO4 battery modules. The single-phase range runs from around 3.6kW up to around 16kW, and three-phase models are available for larger homes and small commercial installs, topping out at 50kW on Sunsynk’s largest three-phase unit. Sunsynk also sells compact all-in-one units, branded LifeLynk, that combine a smaller inverter with an integrated battery in one enclosure.
On the storage side, Sunsynk’s own battery modules come in a handful of capacities, commonly around 5.12kWh and 5.32kWh per unit, with larger rack-mounted options also sold under its Radia name. Installers can stack these modules across multiple units. Sunsynk’s own datasheet for its G5.3 (5.32kWh) battery module states a maximum of 32 units in parallel per inverter, for a total of up to 170kWh. Other lines in the range, such as the rack-mounted R5.3R, are rated for fewer units in parallel, so always check the datasheet for your specific battery and inverter combination.
5.12 kWh+
typical starting capacity across Sunsynk's own battery modules
6,000+
rated cycles quoted on several Sunsynk battery datasheets
16kW
largest single-phase hybrid inverter in Sunsynk's documented UK range
Key technology behind Sunsynk batteries
Sunsynk’s battery modules use lithium iron phosphate (LiFePO4) cells, a chemistry generally regarded as more thermally stable than older lithium-ion formulations. Several of Sunsynk’s own datasheets cite around 6,000 or more rated cycles to 80% depth of discharge.
A notable feature of the wider ecosystem is that many Sunsynk hybrid inverters are not locked to Sunsynk’s own batteries. Several models also support third-party lithium batteries, including Pylontech, BYD and Dyness, over a CAN or RS485 connection. This gives installers more flexibility when specifying a system or working alongside existing equipment.
On the monitoring side, Sunsynk Connect is the brand’s app and online portal. It shows live solar generation, battery state of charge and household consumption, lets you adjust battery and system settings or timers remotely, and sends alerts for events such as grid disconnection or system faults. On setups paired with a compatible time-of-use electricity tariff, the app can also help schedule charging and discharging around cheaper electricity periods. That said, the exact tariff integrations available will depend on your energy supplier and installer setup.
Strengths and limitations
As with any brand, Sunsynk’s own marketing understandably leads with its strengths. Here is a more balanced picture.
Strengths
- Wide hybrid inverter range, from around 3.6kW up to around 16kW single-phase plus three-phase options, suiting a range of home sizes
- LiFePO4 battery modules are stackable, so capacity can be scaled up across multiple parallel units rather than being fixed at one size
- Several inverter models also support third-party batteries, such as Pylontech, BYD and Dyness, alongside Sunsynk's own modules
- Sunsynk Connect gives detailed live monitoring and remote control, with some setups able to automate charging around time-of-use tariffs
Worth checking before you buy
- Sunsynk's own-brand battery modules are rated for 100% depth of discharge, so published usable capacity matches the nominal figure, but maximum stacked totals vary by battery line, from 32 units (170kWh) on the G5.3 down to fewer on others, so always confirm against the datasheet for your exact model
- Warranty cover is tiered on at least some models, with shorter cover on components such as the battery management system than on the cells themselves, so check what is covered after the first few years
- Sunsynk is a newer, less familiar name to many homeowners in markets like the UK than some longer-established brands, even though it is already popular with installers
- We have not independently tested Sunsynk's pricing, support or installation process ourselves
Where Sunsynk fits the market
Sunsynk sits in the installer-fit, whole-home hybrid inverter and battery segment of the market globally. This is the same broad category as brands such as GivEnergy, Alpha ESS and Fox ESS, rather than the plug-in, no-rewiring segment covered elsewhere on this site. Within that segment, installers and retailers often position it as a flexible, competitively priced option, particularly where a household wants a wide choice of inverter sizes or the option to pair with third-party batteries.
Compared with a premium, single-ecosystem product such as Tesla Powerwall, Sunsynk tends to sit at a lower price point with more configuration choices. However, that flexibility also means there are more decisions to get right at the specification stage. If you are still working out what capacity and inverter size actually suit your home before comparing brands, our capacity guide and free calculator cover that ground independently of any one brand.
Common questions about Sunsynk
What does Sunsynk make?
Sunsynk makes hybrid solar inverters and its own LiFePO4 battery storage modules. These are sold as a complete system or, on many models, with the inverter paired with batteries from other brands instead.
Is a Sunsynk battery's stated capacity the same as what I can actually use?
For Sunsynk's own-brand modules, yes. Sunsynk's own datasheets rate both the 5.12kWh and 5.32kWh battery modules for 100% depth of discharge. This means the full nominal capacity is usable, rather than being derated as with many lead-acid or older lithium-ion batteries. Larger rack-mounted options in the range may be specified differently, so it is still worth checking the datasheet for your exact model.
Can Sunsynk inverters work with batteries from other brands?
Many Sunsynk hybrid inverters support third-party lithium batteries, such as Pylontech, BYD and Dyness, over a CAN or RS485 connection. They can also work alongside Sunsynk's own battery modules. Compatibility varies by inverter model and firmware version, so check your installer's compatibility list before committing to a combination.
How many Sunsynk batteries can I add to one system?
This depends on the battery model. Sunsynk's own datasheet for its G5.3 (5.32kWh) battery module states a maximum of 32 units in parallel, for a total of up to 170kWh. Other lines in the range, such as the rack-mounted R5.3R, are rated for fewer units in parallel (eight, around 42.6kWh). Always check the datasheet for the specific battery and inverter combination you are specifying.
What is Sunsynk Connect?
Sunsynk Connect is the brand's monitoring and control app. It shows live solar generation, battery state of charge and consumption, and lets you adjust system settings and timers remotely. On compatible setups, it can also help automate charging and discharging around time-of-use electricity tariffs.
Is Sunsynk a well-established brand?
Sunsynk has built a presence among solar installers and electrical wholesalers in several markets in recent years, including the UK, alongside a longer-standing reputation in South Africa. It remains a newer name to homeowners than some competitors in markets such as the UK. As a result, it is worth weighing installer familiarity and local support alongside the specification sheet when you compare options.
Not sure which battery capacity suits your home?
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