Power Management Unit Build – Part 4

In part 4 of our Power Management Unit Build, we start to wire things up.  There are essentially two separate sections we have to wire.

First we wire the power to the power supply and then to the relays, fuses and power poles.  I have a fuse that protects the hot side of the power supply and then each port has a 10 amp fuse installed on the hot side to protect the devices attached to the unit.

I show how I don’t trust the crimp connectors, so I remove the plastic insulators from them and crimp, solder and finally use heat shrink tubing to protect the connectors.  I also use WAGO LEVER-NUTS for the first time.  I am really happy with how they work and plan on using them again.

To wire up the connections for the controls and the Arduino, I use jumper wires from Pololu and some of our own connectors from Flatwater Trading Post.

The 5v power supply is also hooked up.  I have a heatsink on the LM9805 since it runs so hot.

At the end of this episode we have the Unit running like it was on the breadboard.  So we have to finish the wiring of the momentary switches, port LED’s and the current indicator circuit.

We will do that in Part 5 of the series.

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