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Thanks Substrate for your prompt reply, i think i found the NiteCore NL1835, KeepPower and the Orbtronic that have the integrated Seiko ic. Didn't knew these requirements existed. My question would also be, what type of controller-charger do the charging after the panel and before the cells. I...

Good day to all members. I want to power an Rpi4 of the grid that will run with a 2 series 18650 through a power management board. My setup is a 10w polycrystaline solar panel 18v (open circuit 24v) that connects to a CN3722 mppt board(not sure if its 2s or 3s) and then to a 2s HX-2S-JH20 BMS...