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Synapse solar hot water controller - Available 8 Feb 2021


  • Description
  • Specifications
  • Other parts
  • Documents


Rubicon’s Synapse H2O is the intelligent heart of a water heating system – heating water from the sun’s energy, using your existing electric geyser and element. The H2O both remotely controls and manages the system, providing historical and up-to-the minute status and performance information on the included iOS and Android monitoring app.

Through considering factors beyond just temperature, the system makes intelligent
decisions – ensuring that minimal grid power is used. When both grid and solar power
sources are available, the system favors solar as its power source, ensuring maximum

Synapse H2O's impressive feature set includes powerful remote free for life monitoring, full offgrid use, DC current leakage detection, a wide operating voltage range and more.


AC Input:  
Description Specification 
Voltage 230V AC 
Frequency 50 Hz 
Current 16A 
Connection 3 x 4mm2 Screw Terminals
Installation Pre-requisites AC MCB and local Isolation point (Not supplied) 
AC Detection Yes 

AC Mode Output: 
Voltage 230V AC 
Frequency 50 Hz 
Current 16A 

Solar Input: 
Input Voltage Range 60-171VDC  
Maximum Input Current 10A 
Maximum Power Input 1000W 
MPPT Range 60-171VDC 
Connection MC4 Solar Connectors
Installation Pre-requisites External AC and PV Isolators 

Solar Mode Output: 
Voltage 60-230Vrms Modulated DC @ variable frequency
Max Current 8A 

Geyser Element: 
Max Voltage 230V 
Power 2000W - 3000W 
Element Resistance 17Ω – 27Ω Measure 
Connection at Device 3 x 4mm2 Screw Terminals
Connection at Element 2 + Earth 

Temperature Sensor: 
Description Specification 
Measurement Range 10°C to 85°C 
Accuracy +-2°C  
Type Analog
Diameter 1.5mm 
Cable Length 10m 
Connector Plug (PCB Mounted Jack) 

Wi-Fi 802.11 b/g/n
Remote Updates (Firmware Over the Air) Ability to update firmware remotely 

Mechanical specifications:
Dimensions (Length X Breadth X Depth)210mm x 225mm x 84mm
CoolingNatural Convection
Cable Strain ReliefIntegrated for AC cables and thermal probe, gland for MC4
Ingress ProtectionIP2X 
Terminal Access Removable cover

Installation specifications:
EnvironmentIndoor Use only
FastenersHex Drive bolts (Pozi), Wood Screws 

RFEN 300-328, Designed to IEC 60730 
EMCEN 301489-1, Designed to IEC 60730 
ICASARF approved
CESelf-Certified for EMC
SafetyIEC 60950-1 (Electrical Safety), Designed to Class B IEC 60730

Environmental Conditions:
Maximum Ambient Temperature0°C to +30°C full output, limited output up to +65°C
Relative Humidity0 % - 80%
Operating Altitude0…..2000m

Device safety features:
Device Over-Temperature Shutdown85°C
Over Current Protection Fuse (1 x AC and 1 x DC)
Solar Reverse Polarity ProtectionYes
Grid feedback safetyRelay based power path management 

User safety features:
Earth Leakage detection RCD 

User Interface:
On DeviceRGB Digital LED x 4
Settable Temperature Range+30°C to +70°C (Software)

Other parts


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