Embedded-Rack is a multi SoC Powersupply with i2c connections. It can be used to power up to 13 Raspberry Pi's and one Microcontroller to monitor Powerconsumption in Rackcase.
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Get a 19 inch DIN Rack similar to this from schroff.
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Create a Backcover like in the drawing of /powersupply accordingly to your powersupply. I use this MeanWell RSP-200-5
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Connect a Poweroutlet (with fuse) and solder it to the psu and the psu to the backplane with carefully chosen cable diameter regarding your psu.
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Get some Backplane connectors with 24x2.54mm pinn's like this from aliex.
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Solder some connectors to a daughter-card and push your SoC on it. pi: mouser
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Stick the daughter-board in to the backplane.
The i2c connection between all SoC's can be used as plane communication while adding an TI INA219 can be interessting to measure power over a board separate. Check the adafruit repo's for software and the schematic for parts.
All granted for free as in speech, without waranty. (means that you can use, modify, share, sell if you like. But don't try to sue me for mistakes you do yourself.) Be carefull with Power and re-calculate all wires according to your needs.