Sunsynk 3.6kW ECCO 7kWp Single-Phase Hybrid Inverter
The Sunsynk ECCO 3.6kW (part number SUN-3.6-ECCO, model SYNK-3.6K-SG04LP1) is a 3.6 kW single-phase hybrid inverter with a 7,000 W dual-MPPT PV input, designed for residential solar and battery storage. Often described as the "Swiss army knife" of inverters, the ECCO can charge batteries and export simultaneously — connecting up to 7 kW of PV to a single unit, it exports 3.6 kW while using surplus energy to charge batteries. Compatible with lithium-ion and lead-acid batteries (48 V, 40–60 V range) with up to 50 kWh battery capacity. Automatic switching between grid-tied and off-grid modes. Up to 16 units in parallel. IP65 rated. G98/G99 certified. Available from DECO Group, a UK-based solar trade wholesaler.
Key Technical Details
- Part number: SUN-3.6-ECCO
- Supplier part number: SYNK-3.6K-SG04LP1 ECCO
- Inverter type: Single-phase hybrid (PV inverter and battery storage controller)
- Rated AC output power: 3,600 W (3.68 kW)
- Maximum AC power (5 minutes): 3,960 W
- Surge AC power (1 second): 7,920 W
- Euro efficiency: 96.5%
- Maximum PV input power: 7,000 W
- Maximum input voltage: 500 V
- MPPT voltage range: 150 V to 425 V
- DC startup voltage: 125 V
- Maximum DC input current: 26 A total (13 A + 13 A)
- MPPT quantity: 2 (1 string per MPPT)
- Connector: MC4
- Integrated DC switch: Yes
- Transformer: None (transformerless)
- Battery type: Lithium-ion or lead-acid
- Battery voltage: 48 V DC (40–60 V range)
- Maximum battery charge/discharge current: 90 A
- Maximum battery capacity: 50 kWh
- Ingress protection: IP65
- Weight: 14.6 kg
Key Features
- 3.6 kW rated output with 7 kW PV input — can export and charge batteries simultaneously
- Dual MPPT design for flexible array configuration
- Compatible with lithium-ion and lead-acid batteries (48 V, 40–60 V)
- Up to 50 kWh connected battery capacity
- Automatic switching between grid-tied and off-grid modes
- Fully programmable power export
- Up to 16 units in parallel with the same firmware
- Multiple operating modes: grid-tie only, hybrid, off-grid, battery only
- 6 time periods for battery charging/discharging
- DC couple and AC couple for retrofitting existing solar systems
- Generator input supported
- Anti-islanding protection
- IP65 rated for indoor or outdoor installation
- Compatible with Octopus Agile, Flux, and Go tariffs for smart grid integration
- Remote monitoring and control via Sunsynk app
System Compatibility
- Compatible with lithium-ion batteries (e.g. Pylontech) and lead-acid batteries
- 48 V battery system (40–60 V range)
- Up to 50 kWh total battery capacity
- DC and AC coupling supported for new-build and retrofit installations
- Up to 16 units in parallel
- Register Sunsynk products online for warranty activation
Stock Note
- Stock is a mix of SUNSYNK-3.6K-SG01LP1 and SYNK-3.6K-SG04LP1 models. There is no hardware difference between them. Sunsynk can remotely update the firmware to SG04 after installation.
Installation Notes
- At 14.6 kg, single-person installation is feasible
- IP65 rated for indoor or outdoor installation
- Ideal for larger houses that can take more than 4 kWp of PV where higher power grid connection (G99) is required
- Must be installed by a qualified electrician or technician
Certifications and Compliance
- G98 / G99
- G100
- EN 50549
- IEC/EN 62109-1/2
Warranty
- Standard warranty: 5 years
Common Questions
Click a question below to reveal the answer.
How can the ECCO accept 7kW of PV on a 3.6kW inverter?
The ECCO can charge batteries and export simultaneously. It exports up to 3.6 kW to the grid while using the surplus PV generation to charge connected batteries. This means the full 7 kW of PV input is utilised — not clipped — resulting in more energy captured, particularly during winter months.
What is the difference between the SG01 and SG04 models?
There is no hardware difference between the SUNSYNK-3.6K-SG01LP1 and SYNK-3.6K-SG04LP1. Stock may include either variant. Sunsynk can remotely update the firmware to SG04 after installation.
Can the Sunsynk ECCO work with Octopus energy tariffs?
Yes. The ECCO supports integration with Octopus Agile, Flux, and Go tariffs, allowing batteries to charge at the cheapest rates and discharge when electricity prices are high.
How many ECCO inverters can be installed in parallel?
Up to 16 units with the same firmware can be paralleled for larger installations.
About Sunsynk
Sunsynk is an internationally recognised inverter and battery storage brand offering a wide range of hybrid, off-grid, and grid-tied products for residential and commercial solar installations.
DECO Group supplies Sunsynk hybrid inverters, batteries, meters, and system accessories. Browse our Sunsynk catalogue for complete residential solar storage solutions.
About DECO Group
We supply hybrid inverters, battery systems, and installation accessories to professional installers across the UK. Visit decogroup.co.uk for the full catalogue.
