Solar Mike
New Member
Have just completed a similar controller design using the PI Pico; however the Picaxe 28X2 cpu will also work well here, so spent a couple of hours re-arranging the pcb and schematic for the 28X2 as it maybe of interest to some members here. It is a smaller design than I would normally use and suited to lower capacity batteries.
Basic specs are max input PV voltage 250V, max output charge current 30A. I will be using it with 190 volts input and 100V battery bank, these are dangerous voltages, so caution and some experience is required to build it; can be run it at lower voltages changing the components as required. The smd power mosfets solder to the top pcb layer, heat is transferred to the heatsink through the pcb via an alloy spacer + insulator on the bottom.
Top 150 x 183mm:
I have a few 28x2 cpu's gathering dust, so will build both versions and see how they perform.
If anyone wants the gerber files let me know and I will post them. It will be awhile before I write any software.
Schematic zipped pdf attached.
Cheers
Mike
Basic specs are max input PV voltage 250V, max output charge current 30A. I will be using it with 190 volts input and 100V battery bank, these are dangerous voltages, so caution and some experience is required to build it; can be run it at lower voltages changing the components as required. The smd power mosfets solder to the top pcb layer, heat is transferred to the heatsink through the pcb via an alloy spacer + insulator on the bottom.
Top 150 x 183mm:
I have a few 28x2 cpu's gathering dust, so will build both versions and see how they perform.
If anyone wants the gerber files let me know and I will post them. It will be awhile before I write any software.
Schematic zipped pdf attached.
Cheers
Mike
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