Deye SUN800G3 Microinverter
The Deye SUN800G3-EU-230 is the microinverter that serious UK DIY solar builders use when they want genuine 800W output with excellent efficiency at a competitive price. Deye (also known as Sunsynk in the UK hybrid inverter market) has a strong engineering reputation, and the SUN800G3 benefits from the same quality standards as their hybrid inverter range.
Pros
- 800W true rated output with high conversion efficiency (≧96.5%)
- Dual MPPT for independent panel tracking — handles partial shading well
- From the same manufacturer as Sunsynk hybrid inverters — strong engineering pedigree
- UKCA certified and compliant with BS 7671 Amendment 4
- Competitive pricing — typically cheaper than Hoymiles at equivalent spec
- IP67 rated — suitable for outdoor installation
Cons
- Less brand recognition in UK retail than Hoymiles or EcoFlow
- DTU monitoring unit required separately — adds £30–£40 to total cost
- App interface less polished than EcoFlow or Anker
- Warranty and support routes primarily through Chinese manufacturer channels
Deye is better known in the UK DIY solar community as Sunsynk — the brand behind one of the most popular hybrid inverters for home battery systems. The SUN800G3 microinverter brings the same engineering standards to the plug-in solar market, and the result is a capable, efficient microinverter at a genuinely competitive price.
Deye vs Hoymiles: which to choose
The Deye SUN800G3 and Hoymiles HM-800 are the two dominant options for technical UK buyers who want to build their own plug-in solar system rather than buy a complete kit. The Deye is typically slightly cheaper and has a marginally higher efficiency rating. The Hoymiles has a larger installed base in the UK and Europe, meaning more community knowledge, more third-party accessory options, and a better-developed support ecosystem.
For most buyers, the practical difference is minimal. Both are 800W dual MPPT microinverters, both are UKCA certified, and both will generate approximately the same amount of electricity from the same panels in the same location. Choose Hoymiles if community support matters to you; choose Deye if you're optimising for efficiency and price.
The Sunsynk connection
Deye and Sunsynk are the same company operating under different brand names in different markets. This matters because it means the engineering and quality control standards that made Sunsynk's hybrid inverters a preferred choice for UK DIY solar installers apply equally to the SUN800G3. If you already have a Sunsynk system and want to add plug-in panels, the Deye microinverter is the natural pairing.
The verdict
The Deye SUN800G3 is the technically superior choice for buyers who care about efficiency and are comfortable with a less established brand name. Strong engineering, competitive price, and a genuine performance edge over the Hoymiles at the same power class.
