Home » Sunsynk ECCO 3.6kW Hybrid Inverter | SYNK-3.6K-SG04LP1
Sunsynk ECCO - Hybrid Inverter
Sunsynk ECCO - Hybrid Inverter
Sunsynk ECCO - Hybrid Inverter
Sunsynk ECCO - Hybrid Inverter
Sunsynk ECCO - Hybrid Inverter
Sunsynk ECCO - Hybrid Inverter
Sunsynk ECCO - Hybrid Inverter
Sunsynk ECCO - Hybrid Inverter
SKU: SUN-3.6K-SG04LP1
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Sunsynk ECCO 3.6kW Hybrid Inverter | SYNK-3.6K-SG04LP1

Sunsynk
£895.00 Inc. VAT £745.83 Exc. VAT
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The Sunsynk ECCO 3.6kW (SYNK-3.6K-SG04LP1) is a single-phase hybrid inverter that combines a solar inverter, a battery charger and a backup (UPS) output in one wall-mounted, IP65-rated unit. Two independent MPPT trackers accept up to 7000W of PV, so a 3.6kW AC rating can be paired with a generously sized array, including roofs split across two orientations. It works with 48V lithium-ion and lead-acid batteries at up to 90A charge and discharge.

Control is handled by a fully programmable controller with six charge/discharge time periods, zero-export and solar-export modes using a CT coil or energy meter, a generator input and an auxiliary load output that can divert surplus solar once the battery is full, for example to a hot water immersion. The colour touch LCD shows live power flow, and the Sunsynk Connect app provides remote monitoring through the data logger. Systems can be expanded by paralleling up to 16 single-phase units.

The grid code is selectable on the inverter, including G98/G99 for the UK, and the unit carries a 5-year manufacturer warranty. Installation must be carried out by a qualified electrician.

3.6kW
Rated AC and UPS output
7000W
Max PV input, 2 MPPT
90A
Battery charge / discharge
97.6%
Max efficiency
IP65
Indoor or outdoor mounting
5 Years
Manufacturer warranty
Professional installation only
The manufacturer states this inverter must be installed by a qualified, licensed electrical contractor and is not a DIY product. Installation must comply with BS 7671, and the connection must be notified to or approved by the network operator under G98 or G99 as applicable. Before switching on, the installer must confirm the PV array open-circuit voltage does not exceed 480V and that the earth connection is made. PV+ and PV− must never be connected to earth.
Grid connection and output rating
The rated output current is 15.7A at 230V (16.4A at 220V), and the manufacturer states the 3.6kW model’s output current is capped at 15.7A for G98 compliance. The current datasheet lists a maximum AC output of 3960W (17.2A at 230V), whereas earlier revisions list 3680W. The total generation connected at the property, including parallel units and AC-coupled inverters, decides whether G98 or G99 applies. Set the grid mode to G98/G99 on the inverter, or G99/G100 where G100 export limitation is required.
Choosing the mounting location
Do not mount in salt-laden coastal or marine air, in oily or steamy areas such as kitchens, in direct sunlight, at altitudes above 2000m, or where gas may collect. Leave about 500mm clear at each side, above and below, and 1000mm in front, and mount at eye level so the display can be read. Output derates above 45°C ambient.
Battery communication
Lithium batteries connect through RS485 or CAN so the inverter can follow the battery’s BMS limits. The manufacturer publishes a list of tested batteries, including Pylontech US2000, US3000, US5000, UP5000 and Force L1/L2, Dyness, BYD Battery-Box LV Flex Lite, Weco and Pytes. A battery without BMS control is treated as lead-acid and must be set up to its maker’s limits.

Key features

Dual MPPT, 7000W PV
Two trackers with a 150–425V MPPT range, 13A + 13A input and one string per tracker. Start-up from 125V, full load across 300–425V and MPPT efficiency above 99%.
Lithium and lead-acid batteries
40–60V battery range with 90A charge and discharge, a 3-stage charge curve with equalisation and self-adaptation to the battery BMS. A battery temperature sensor is supplied for lead-acid banks.
Programmable energy management
Six time periods for charging and discharging from solar, grid or generator, plus zero export, solar export, limit to load only, grid trickle feed and grid peak shaving. Suits time-of-use tariffs.
Backup (UPS) output
A dedicated LOAD port supplies essential circuits at 3600W, with 2× peak power for 10 seconds off-grid, 35A AC passthrough, auto restart when the grid returns and an automatic earth-bond relay.
Multi-source and expandable
Generator input with start contacts, wind turbine support (up to 400V), AC coupling for existing PV or microinverters up to 4kW (firmware dependent) and single-phase parallel operation of up to 16 inverters.
Display and monitoring
Colour touch LCD with a visual power-flow screen, Wi-Fi or GSM monitoring via the data logger and the Sunsynk Connect app, and a meter port for CHINT DDSU666 or Eastron SDM120CT meters.

What’s in the box

Sunsynk ECCO 3.6kW hybrid inverter
Wall mounting bracket
4 × M8×80 stainless anti-collision bolts
2 × M6×12 stainless mounting screws
Data logger for app monitoring
Battery temperature sensor and sensor clamp
Parallel communication cable
Battery and BMS magnetic rings
L-type hexagon wrench
User manual

Technical specifications

General
Brand
Sunsynk
Series
ECCO SG04LP1
Model
SYNK-3.6K-SG04LP1
Earlier model code
SUN-3.6K-SG04LP1-EU
Type
Single-phase hybrid inverter with dual MPPT
Installation style
Wall-mounted
Warranty
5 years
PV input
Max DC input power
7000W
Max PV input voltage
500V
PV input voltage (rated)
370V (125–500V)
MPPT voltage range
150–425V
Start-up voltage
125V
Full load DC voltage range
300–425V
PV input current
13A + 13A
Max PV Isc
17A + 17A
MPPT trackers / strings per tracker
2 / 1+1
Battery
Battery type
Lead-acid or lithium-ion
Battery voltage range
40–60V
Max charging current
90A
Max discharging current
90A
Charging curve
3 stages / equalisation
Lithium charging strategy
Self-adaptation to BMS
BMS communication
RS485, CAN
AC output and grid
Rated AC output and UPS power
3600W
Max AC output power
3960W
Peak power (off-grid)
2 × rated power for 10 seconds
AC output rated current
16.4A at 220V / 15.7A at 230V
Max AC current
18A at 220V / 17.2A at 230V
Max continuous AC passthrough
35A
Rated voltage and range
220V / 230V, 0.85Un–1.1Un
Grid connection form
L + N + PE
Frequency and range
50Hz (45–55Hz) / 60Hz (55–65Hz)
Power factor adjustment
0.8 leading to 0.8 lagging
Current harmonic distortion (THDi)
Below 3% of nominal power
DC current injection
Below 0.5% In
Efficiency
Max efficiency
97.6%
Euro efficiency
96.5%
MPPT efficiency
Above 99%
Protection
Integrated protection
PV input lightning protection, anti-islanding, PV string reverse polarity protection, insulation resistance detection, residual current monitoring unit, output over-current protection
Surge protection
Type II (DC), Type II (AC)
DC isolation
Integrated DC switch
Standards
Grid connection standards
EN 50549-1, AS/NZS 4777.2, NRS 097-2-1; selectable grid mode including G98/G99
EMC and safety
IEC/EN 61000-6-1/2/3/4, IEC/EN 62109-1, IEC/EN 62109-2
Mechanical and environmental
Dimensions (W × H × D)
330 × 433 × 238 mm
Weight
14.6kg
Protection degree
IP65
Operating temperature
−45 to +60°C, derating above 45°C
Cooling
Natural cooling
Noise
Below 30dB
Installation guidance (manufacturer recommendations)
Grid port AC breaker
25A
Backup load port AC breaker
40A
Battery DC breaker
120A
Battery cable
25mm² (2AWG), 5.2N·m terminal torque
AC cable
6mm² (10AWG), 1.2N·m terminal torque
PV cable
4mm² (12AWG)
Parallel operation
Up to 16 single-phase units, identical firmware, CT on master only

Frequently asked questions

Does the ECCO 3.6kW need a battery to work?
No. Selecting the No Batt option with the CT coil connected lets the inverter run as a grid-tied solar inverter. A battery is needed for backup power, time-of-use charging and storing surplus solar.
Which batteries can I connect?
Any 48V lithium-ion or lead-acid battery within the 40–60V range. Lithium batteries on the manufacturer’s tested list communicate over CAN or RS485. For lead-acid banks, keep charge and discharge current to about 25% of the bank’s Ah rating and fit the supplied temperature sensor. Always follow the battery maker’s current limits, as the inverter can deliver up to 90A.
How much solar can I connect?
Up to 7000W DC across the two trackers, with each string staying within 500V maximum and ideally inside the 150–425V MPPT window. Each input accepts 13A operating and 17A short-circuit current. Modules should be Class A rated to IEC 61730, and the array must not be earthed. The AC output remains limited to the rated 3600W.
Will it keep the lights on during a power cut?
Yes, for circuits wired to the LOAD (essential loads) port, at up to 3600W continuous with double that for 10 seconds for motor starts. Circuits on the GRID side are not backed up. Run time depends on the battery capacity and state of charge, and a generator can be added to the GEN port to extend it.
Do I need network operator approval, and how is export limited?
Total generation up to 16A per phase is normally notified under G98, while larger installations need G99 approval first. Parallel units and AC-coupled inverters count towards the total. To limit or stop export, fit a CT coil on the incoming live conductor, with the arrow pointing towards the inverter, or a supported meter, then select Zero Export or the export limit in the menu. The manufacturer’s parts list covers the items shown above, so ask our team if you also need a CT or meter supplied. Your installer should confirm the requirements with your network operator.
Can the system be expanded later?
Yes. Up to 16 single-phase inverters can be paralleled on one phase with identical firmware, and a three-phase system can be built from single-phase units, one master per phase. The GEN port can also take a generator, an AC-coupled microinverter or grid-tie inverter up to 4kW, or work as an auxiliary load output that switches on when the battery is full and PV power passes a set threshold.
BTU & WATT Calculator
Room Dimensions
Room Type
Living Room
Bedroom
Kitchen
Bathroom
Conservatory
Hallway
Glazing Type
Single Glazed
Double Glazed
Triple Glazed
External Walls
0 Wall
1 Wall
2 Walls
3 Walls
4 Walls
Insulation Level
Poor
Average
Good (New Build)
Required Heating
0
Watts
0
BTUs
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