Distributed power management LK-WM28

This smart distributed DC power management and charging device has the purpose of charging 5V DC battery walls and power packs from the main 220V AC line at home. The innovation of this power charging device is in the ability to schedule charging to specific times during the day and night according to the price of electricity change. It can be programmed using machine learning to connect to an electricity market data source and calculate the best time to schedule battery charging according to the price variations in the electricity markets. Made to fit the LK-WM28 enclosure sold on Aliexpress ( Buy here ). It is a wall-mount type of installation.

Interactive view of the PCB Layout Interactive view of the circuit schematic
^{Click to view the latest revision}

Summary of the Hardware Capabilities

3 USB-A for fast charging up to 30W
With 220V AC to DC converter and Power charging scheduler to allow charging only when the electricity price is lower (during the night) using machine learning algorithms.
With a 5.0V DC two-wire connector to allow DC charging from another source (for instance from solar panels)
With a 5.0V DC two-wire connector to power an indoor main DC line for all 5.0V devices and electronics (smartphones, tablets, or any other)
With individual power consumption metrics on all USB ports (voltage, current, and power )
With the detection of an empty/full "power wall" battery pack connected to one of the 3 USB-A ports
Display
- 1.47" LCD TFT display
Power Consumption
- extreme low power consumption when in sleep mode. Only ~320nA
Firmware update via USB-C
- for firmware updates/upgrades
- installation of Custom firmware possible ( tunning)
- for local troubleshooting of errors on the module and on the CANBUS network

You can read about this project on Hackster here.

Off the Grid usage (RV, Boats)

This smart distributed power management device can be installed and utilized off the grid, such as sail boats and motor homes. It can do battery charging when the AC plug is connected (this rev. max 60W) and a max 5V DC 5A solar charging to 3 USB-A ports. This means one can use those commercially available 100,000mA power banks as power walls. Or a real 5V DC power wall. Any will do as long as it runs on 5V DC and is able to connect to a USB-A Port.

Compatibility

Parts Needed

Buy the LK-WM28 Enclosure 130x89x31mm on AliExpress
buy the Smart PCB electronics (assembled) o Tindie.com

About the sponsor
Seeed Studio Fusion PCBA Service, offers comprehensive PCB manufacturing, prototype PCB assembly, and more. Their services cover everything from PCB fabrication, parts sourcing, and assembly, to testing,. Seeed Co-create Program can assist you in bringing your product to market with expert guidance and business networking.

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Miguel Tomas

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