12/4/2023 0 Comments Wifi battery shunt![]() ![]() And of course, something to cut cable and strip the plastic insulation from the ends. Tools needed: screw driver / drill, crimper / pliers, 8mm spanner or ring socket (ring socket easier). Example 1 ‘standard’ emonDCduo with enclosure, ring terminals and on-board power supply. Have an understanding of shunts, high-side vs low-side shunt monitoring, and whether or not your electrical Ground needs earthing or can float. Plan your cabling and equipment to allow installation of this energy monitor. Lightning protection using Gas Discharge Tube (GDT) (external link).Typically generator (uni-directional and battery (bi-directional). Shunt amplifier ‘reference select’ headers, for uni or bi-directional measurement.Reference voltage and line voltage divider resistors.Power Select header, for bringing power into an on-board buck regulator, if used.The terminal block for a gnd connection or shunt-lead shielding, if used. GND connections, for the power-supply earth with a 4mm ring terminal on a mount.RFM69Pi radio module from OpenEnergyMonitor, typically 433MHz.īelow are a set of images outlining some other customisations.Search for ‘i2c io expander module board’ for some options, PCF8574 and PCF8575 based modules have been tested and work fine. Any I2C control module can be fitted in parallel.RTC based on PCF8523, with coin cell backup, parts sold as kit.128x32 I2C OLED Display module cycles through real-time and daily data, including network information if connected.Holes can be drilled easily, or prepared units can be bought from the OpenEnergyMonitor shop. I could not enable a USB connection for the safety reasons in floating-ground systems.ĮmonDCduo has been designed for waterproof plastic enclosures from Lincoln Binns. The LM2596 buck modules on ebay, shown here fitted.ĥV input with 5.08mm pitch Terminal Block for 5V direct input. Note: using an onboard buck regulator is preceded by fuse F1. My own DC-DC buck regulator featuring under-voltage lockout for battery protection, adjustable output voltage, rated at 3A for 10s or 1A continuous. Using a buck regulator the board can be self-powered from either current sense channel. Example of external shunt (external link). ![]() Any of the above, 7.62mm pitch Terminal Block recommended.Directly soldered cable, using the bolt mounts.Ring terminal outer-diameter not exceeding 11.0mm. 7.62mm pitch Terminal Block, such as this. 10.16mm pitch Terminal Block, such as this. Terminations for Onboard Shunts (up to 50Amps) Onboard shunts should be selected to not dissipate more than 50% of their rated value continuously shunt power calculator. Onboard 50Amps max || External 1000Amps max. See this demo video of the options, listed below in detail. Skipping wireless transmission, a physical cable UART connection is possible, compatible with RS485 pending testing.ĮmonDCduo as designed here has shunt, termination, power-supply and other module options.The I2C port can connect control boards for power management, in development.Voltage divisions for reference voltages easily modified by soldering for maximum resolution for given system.Radio transmission of data possible through RFM69Pi module.Data can be stored locally to a MicroSD card, keeping time with on-board RTC and coin-cell. It can function as independent unit self-powered using an onboard buck regulator module, powered from either measurement channel.Over-voltage and reverse voltage protected (fuses).Hall-effect current sensor footprint alternative for isolated current only measurement.50Amps onboard shunt rating or 1000A external shunt rating.Two-channel high only DC current and voltage sensing, up to 64.4V or 75V, suitable for a wide range of low-voltage generator/battery systems. ![]() Extra-low voltages can still mean high currents.įind Documentation on some fundamental DC monitoring concepts in the ‘doco’ folder, which contains a reference pdf.
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