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emonDC Duo (Development Kit)

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  • WiFi ESP8266 Interface
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£71.99 (inc VAT) £59.99 (exc VAT)
300.00 Grams
Calculated at checkout

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emonDC is a project aiming to develop DC current and voltage measuring tools compatible with openenergymonitor.org project.

The main board is emonDCduo, a fully open-source dual-channel generator/battery monitor, WiFi enabled, aimed at solar/battery systems.

Target Uses

• 12V, 24V and 48V Solar PV systems (max 65V)
• Battery monitoring
• Remote DC datalogging


• Two-channel low and high-side DC current and voltage sensing, up to 64.4V or 75V, suitable for a wide range of low-voltage generator/battery systems.
• 50Amps onboard shunt rating or 1000A external shunt rating.
• Waterproof, clear-top plastic case.
• OLED display.
• WiFi Connectivity (ESP8266).
• Low-power mode (10mA draw).
• Accurate 12-bit ADC.
• Over-voltage and reverse voltage protected (fuses)

• It can function as independent unit self-powered using an onboard buck regulator module, connected to either channel, generator or battery. Data can be stored locally to a MicroSD card, keeping time with on-board RTC and coin-cell.
• Radio transmission of data possible through RFM69Pi module.
• Voltage divisions for reference voltages easily modified by soldering for maximum resolution for given system.
• The I2C port can connect control boards for power management, in development.
• Skipping wireless transmission, a physical cable UART connection is possible, compatible with RS485 pending testing.

Fully open-source.



Disconnect the power before working on a system. 

Be aware of high currents even in extra-low voltage systems.

Isolation. The protection of users and connected devices from floating ground voltages in certain applications is very important. The approach at present is to make use of suitable physical isolation and warning labels. Bright warning labels stating ‘disconnect DC system before connecting UART’ or ‘ensure common ground between DC system and other devices to be connected’ or something similar, pending advice. 

Short circuit protection exists at different levels of the hardware design to avoid inadvertent damage to the unit, by assembly faults on part of the manufacturer (PCB and assembly) or assembler, or the user upon installation. This has been achieved by adding fuses and buffering certain inputs with resistors. 

Transient and reverse voltage protection. The TVS diodes specified have been tested with a ignition sparker, they serve to protect the board downstream from the inputs. The combination of fuse and diode creates the over-voltage protection.
Lightning Protection. Gas Discharge Tubes can be used to protect the device from lightning. (external link)

The unit is defined as a Protected Extra-Low Voltage (PELV) device.



Setup Guide

Hardware, Software & Technical docs: https://github.com/danbates2/emonDC


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