Hi @szmolnar. Sorry for not being very responsive. I’m currently in Rwanda for a solar project and quite busy.
Yeah, the STM32L0 a bit annoying. There seems to be an issue in OpenOCD which makes flashing fail sometimes. I could not find the perfect solution yet, see also here and here. However, with the original ST software or with Segger debug probes it works fine.
It might actually be possible that the new 20A MPPT design supports your setup with LED boost converter with a few tweaks. I’ll have to double-check. And I will try to upload a first design before Christmas.